Project Summary

During this project, we'll be building a web application that allows for categorizing information in radar charts. We'll build out two main components to make our web application work. The component that allows for making new charts and the component that displays a list of the created charts and allows us to navigate between charts. The component for adding datasets to charts will already be built out for us. However, we will create the reducer code that the component will use. The radar chart will also already be setup for us. We'll just need to pass the correct data to its component. To keep track of data and pass it to the correct components we'll make heavy use of Redux and React Redux.

The following diagram can serve as a useful reference point on how data is flowing in the application if you ever get a little lost.

A live example can be found here

Setup

Fork and clone this repository.
cd into the project directory.
Run npm install to download the included dependencies.
In one terminal window/tab run npm test to start the test suite.
In another terminal window/tab run npm start to spin up the development server.

Step 1

Summary

In this step, we'll download the necessary packages to use Redux and create a reducer for our charts.

Instructions

Install Redux and React Redux using npm.
Create a chart.js file in src/ducks/.

Create an initial state object at the top of chart.js called initialState with the following properties:

activeChartIndex - The index of the active chart. This should default to value of 0.

charts - The array of charts. Each chart will be an object. This array should default to having one chart.

Default Chart Code

{
  labels: [ "Red", "Blue", "Yellow", "Green", "Purple", "Orange" ], 
  name: "Example Chart", 
  datasets: [
    {
      label: "My First dataset", 
      data: [65, 59, 90, 81, 56, 55, 40]
    },
    {
      label: "My Second dataset",
      data: [28, 48, 40, 19, 96, 27, 100]
    }
  ]
}

Create a reducer function underneath the initialState called chart:
- This function should be exported by default.
- This function should have two parameters:
  - state - The current state of the application. This should default to initialState.
  - action - An object containing information about what has occurred and any data necessary to perform a state change.
- This function should use a switch statement on the action.type:
  - Add a default case that returns state.

Detailed Instructions

Let's begin by installing the following dependencies we'll need in order to use Redux with our react application. Open up a third terminal window/tab and make sure you are still in the root directory of the project and then run npm install redux react-redux.

While the install is happening, open the ducks folder ( src/ducks ) and create a file called chart.js. This is where we'll create our reducer, action types, action creators, and the initial state for our reducer.

Now let's open src/ducks/chart.js and start by creating an initialState variable. initialState should be an object with two properties: activeChartIndex and charts.

activeChartIndex - This is where we will store the index of the chart that the user has chosen to display.
charts - This will be an array of objects containing the data necessary to create the charts.

Let's set the value of activeChartIndex to 0 so it will display the first chart and let's default charts to an array. We'll also add a default chart to the charts array. The charts array will contain an array of chart objects that will keep track of the following information:

labels (array of strings): The labels that will appear at the corners of the chart.
name (string): The name of the chart.
datasets (array of objects): Data required for rendering values on to the chart

Our default chart will be the following object:

Default Chart Object

{
  labels: [ "Red", "Blue", "Yellow", "Green", "Purple", "Orange" ], 
  name: "Example Chart", 
  datasets: [
    {
      label: "My First dataset", 
      data: [65, 59, 90, 81, 56, 55, 40]
    },
    {
      label: "My Second dataset",
      data: [28, 48, 40, 19, 96, 27, 100]
    }
  ]
}

A dataset object in the datasets array will have two properties: label and data. The label is a string value for the name of the dataset and the data array contains the integer values for the labels of the chart. Let's take a look at the first dataset object:

{
  label: "My first dataset",
  data: [65, 59, 90, 81, 56, 55, 40]
}

Since the default chart has the labels: "Red", "Blue", "Yellow", "Green", "Purple", "Orange". The value for "Red" is 65, the value for "Blue" is 59, and so on till the the value for "Orange" is 40. This relationship is made through the index of the arrays.

Your chart.js should now look like:

const initialState = {
  activeChartIndex: 0,
  charts: [
    {
      labels: [ "Red", "Blue", "Yellow", "Green", "Purple", "Orange" ], 
      name: "Example Chart", 
      datasets: [
        {
          label: "My First dataset", 
          data: [65, 59, 90, 81, 56, 55, 40]
        },
        {
          label: "My Second dataset",
          data: [28, 48, 40, 19, 96, 27, 100]
        }
      ]
    }
  ]
};

Let's move on to the next part of this step and create our reducer under the initialState variable. Create and export by default a function named chart which takes two parameters: state and action.

state - This will be an object representation of our application's current state.
- It should default to initialState.
action - An object containing information about what has occurred and any data necessary to perform a state change.

export default function chart( state = initialState, action ) {

}

In ES2015 we can set default parameters by using an = sign in the function's head. state = initialState means that whenever chart gets called and state is not defined, it will use the value of initialState instead.

Now that our reducer function is created let's add a switch statement to the chart function that checks action.type. Later it will check for specific types but for now just give it a default case that returns state.

export default function chart( state = initialState, action ) {
  switch(action.type) {
    default:
      return state;
  }
}

Solution

src/ducks/chart.js

const initialState = {
  activeChartIndex: 0,
  charts: [
    {
      labels: [ "Red", "Blue", "Yellow", "Green", "Purple", "Orange" ], 
      name: "Example Chart", 
      datasets: [
        {
          label: "My First dataset", 
          data: [65, 59, 90, 81, 56, 55, 40]
        },
        {
          label: "My Second dataset",
          data: [28, 48, 40, 19, 96, 27, 100]
        }
      ]
    }
  ]
};

export default function chart( state = initialState, action ) {
  switch(action.type) {
    default:
      return state;
  }
}

Step 2

Summary

In this step, we'll create a store that will use the reducer we made in the previous step.

Instructions

Create a store.js file in src/.
Create a Redux store inside of the store.js file you just created:
- Import createStore from 'redux'.
- Import chart from the reducer we made in the previous step ( ./ducks/chart.js ).
- Call the createStore function with chart as the first parameter.
  - This function call should be exported by default.

Detailed Instructions

Let's begin by creating a new file in src named store.js. Inside of src/store.js we'll want to import createStore from redux and chart from src/chart.js. Then we can use createStore by invoking it and passing in our chart reducer. We'll also want to export this by default.

import { createStore } from 'redux';
import chart from './ducks/chart';

export default createStore(chart);

Basically, Redux is creating the store and calling our reducer chart with undefined and a dummy action as arguments. This will then cause our reducer to return the initialState variable and give our store an initial state.

Solution

src/store.js

import { createStore } from "redux";
import chart from "./ducks/chart";

export default createStore( chart );

Step 3

Summary

In this step, we'll connect Redux to our application in index.js.

Instructions

Open src/index.js.
Import Provider from react-redux after the import for ReactDOM
Import store from src/store.js after the import for ./index.css.
In ReactDOM.render():
- Wrap the <App /> component in a Provider component.
- Add a store prop to the Provider component that equals store.

Detailed Instructions

Let's being by opening src/index.js and importing Provider from react-redux and store from src/store.js.

import { Provider } from 'react-redux';
import store from './store.js';

Now that we have our store and Provider component, let's wrap the App component with the Provider component. We'll also need to add a store prop to Provider. The store prop should equal the store we imported earlier. This will give our application access to the Redux store.

ReactDOM.render(
  <Provider store={ store }>
    <App />
  </Provider>,
  document.getElementById( 'root' )
);

Solution

src/index.js

import React from "react";
import ReactDOM from "react-dom";
import { Provider } from "react-redux";

import "./index.css";

import store from "./store";

import App from "./components/App";

ReactDOM.render(
  <Provider store={ store }>
    <App />
  </Provider>,
  document.getElementById( 'root' )
);

Step 4

Summary

In this step, we will connect the App component definition to Redux.

Instructions

Open src/components/App.js.
Import connect from react-redux above the import for ./App.css.
Create a mapStateToProps function above the export statement of App.
- This function should use object destructuring on the first parameter:
  - The first parameter will always be a state object which will always have two properties. activeChartIndex and charts.
- This function should return an object with the following properties:
  - activeChart - Should equal the actual object of the active chart.
  - charts - Should equal the entire array of charts.
Modify the original export of App to export it's decorated version:
- Invoke connect and pass in mapStateToProps as the first parameter.
- Invoke the function it returns with App as the first parameter.

Detailed Instructions

Let's being by opening src/components/App.js. At the top of the file, just above the import for ./App.css, let's import connect from react-redux. We'll use this later to connect our App component. Now let's create a mapStateToProps function above our export statement for App. This function should destructure the first parameter. The first parameter will always be a state object that will always have the following two properties: activeChartIndex and charts. Therefore we can destructure it by doing { activeChartIndex, charts }.

function mapStateToProps( { activeChartIndex, charts } ) {

}

Object Destructuring

Using ES2015 we can destructure the object that gets passed into mapStateToProps by using { activeChartIndex, charts }. This takes the object that would get passed in as the first parameter and turns its props into variables we can reference in the function. This is the same thing as doing:

// state = { activeChartIndex: 0, charts: [] }
function mapStateToProps( state ) {
  return {
    activeChart: state.charts[ state.activeChartIndex ],
    charts: state.charts
  }
}

This function will be used to tell Redux which pieces of state our App component is interested in and also format state before reaching App. Let's have our mapStateToProps return an object with a activeChart and charts property.

activeChart - This should equal the actual object of the chart, we can do this by using our activeChartIndex with our charts array.
charts - This should equal the array of charts.

function mapStateToProps( { activeChartIndex, charts } ) {
  return {
    activeChart: charts[ activeChartIndex ],
    charts: charts
  };
}

To finish connecting the App component definition, we need to create a decorator by invoking connect and passing in mapStateToProps. This will return a function we need to then invoke and pass in our App component. Finally, we'll then want to modify our export statement to equal the decoratedComponent instead of App.

Decorators can be created one of two ways:

function mapStateToProps( state ) {
  return state;
}
const decorator = connect( mapStateToProps );
const decoratedComponent = decorator( App );
export default decoratedComponent;

function mapStateToProps( state ) {
  return state;
}
export default connect( mapStateToProps )( App );

Either way accomplishes the same thing, but in the solutions to come I'll be using the shorter version.

Solution

src/components/App.js

import React, { Component } from "react";
import {connect} from "react-redux";

import "./App.css";

import NewChart from "./NewChart/NewChart";
import Sidebar from "./Sidebar/Sidebar";
import AddDataset from "./AddDataset/AddDataset";

class App extends Component {
  render() {
    return (
      <div className="app">
        <Sidebar />
        <main className="app__main">
          <header className="app__header">
            <h1 className="app__title">Categorizer</h1>

            <div className="app__new-chart">
              <NewChart />
            </div>
          </header>
        </main>
      </div>
    );
  }
}

function mapStateToProps( { activeChartIndex, charts } ) {
  return {
    activeChart: charts[ activeChartIndex ],
    charts
  };
}

export default connect(mapStateToProps)(App);

Step 5

Summary

In this step, we are going to dive deeper into the flow of data to remove any layers of abstraction that might have appeared. If you feel confident in the flow of data up to this point, feel free to skip this step.

Visualization

So far we've create a reducer and a store and then hooked it up to our App. But what exactly is the order of events in these files we've created? The first event in this chain is in our index.js. When we import store it goes into store.js and then store.js imports chart.js which causes our initialState variable to be created. After that store.js then invokes createStore(chart) which calls our reducer in chart.js. It calls our reducer with undefined for the state parameter and an object with a type property equal to "@@redux/INIT" for the action parameter.

Since state was equal to undefined our default parameter sets state equal to our initialState variable in chart.js. Then our switch statement fires for action.type and returns state because of the default case.

We then go back to index.js which then imports App.js. This causes the export default for App to fire which calls our mapStateToProps function above the export. mapStateToProps is called with our initial state as an object:

{
  activeChartIndex: 0,
  charts: [
    {
      labels: [ "Red", "Blue", "Yellow", "Green", "Purple", "Orange" ], 
      name: "Example Chart", 
      datasets: [
        {
          label: "My First dataset", 
          data: [65, 59, 90, 81, 56, 55, 40]
        },
        {
          label: "My Second dataset",
          data: [28, 48, 40, 19, 96, 27, 100]
        }
      ]
    }
  ]
}

mapStateToProps then modifies this object and returns a new object. This new object then becomes the props for the App component. Be aware that there are other events happening in between these events, mostly by Redux, but at a high-level this is the chain of events for the files we created.

In the following giphy take note of which file the debugger is currently in:

Step 6

Summary

In this step, we will be creating our first action type and action creator for creating new charts. We'll then update our reducer to handle our first action by returning a brand new state object.

Instructions

Open src/ducks/chart.js.
Create a CREATE_CHART action type at the top of the file, that equals "CREATE_CHART".
Create a createChart action creator underneath the chart reducer:
- This function should take two parameters:
  - labels - An array of labels that the chart will have.
  - name - A string that equals the name of the chart.
- This function should return an object with two properties:
  - chart - An object containing the necessary chart data.
    - Hint: { lables: [], name: string, datasets: [] }
    - Since we do not get any datasets from this action, default it to an empty array.
  - type - A string that equals the action type, in this case CREATE_CHART.
- Export this action creator function.
Modify the chart reducer to handle adding a new chart:
- Add a case to the switch statement, above the default case, for CREATE_CHART.
- Create and return a new state object with the following properties:
  - activeChartIndex - Should equal 0 because we add new charts to the beginning of the charts array.
  - charts - Should equal an array with the new chart in front and all the old charts after it.
  - Remember to not mutate old state

Detailed Instructions

Let's begin by opening src/ducks/chart.js. At the top of the file create a variable called CREATE_CHART and set it equal to "CREATE_CHART". This variable will be our action type. You can think of action types as descriptions of what happened. The action types get used by our reducer to determine how to change state.

const CREATE_CHART = "CREATE_CHART";

Now let's create our action creator underneath the chart reducer. Create and export a function named createChart with two parameters:

labels - An array of labels that the chart will have
name - A string that equals the name of the chart

This function should return an object with two properties:

chart - An object containing the necessary chart data
type - The action type, in this case CREATE_CHART

We can determine what the necessary chart data is by looking at our initialState object and the first object in the charts array. ( labels: [], name: string, datasets: [] )

export function createChart(labels, name) {
  return {
    chart: { labels, name, datasets: [] },
    type: CREATE_CHART
  }
}

Shorthand Notation

In ES2015 you can use shorthand notations for assigning properties on an object. The above solution is the same thing as doing:

return {
  chart: { labels: labels, name: name, datasets: [] },
  type: CREATE_CHART
}

With the action creator ready to go, we now need to update the reducer function itself to handle the action. Add a new case to the switch statement, above the default case, that checks for CREATE_CHART. This case should return a new state object where our new chart is at the beginning of the charts array and has all of the previous state's charts after it. activeChartIndex should still be set to 0 since our new chart gets added to the beginning of the charts array.

Remember not to mutate state! You should be returning a brand new object based on the values from the previous state object.

export default function chart( state = initialState, action ) {
  switch(action.type) {
    case CREATE_CHART:
      return {
        activeChartIndex: 0,
        charts: [ action.chart, ...state.charts ]
      };
    default:
      return state;
  }
}

We'll see this action work live in our application at the end of the next step.

Solution

src/ducks/chart.js

const CREATE_CHART = "CREATE_CHART";

const initialState = {
  activeChartIndex: 0,
  charts: [
    {
      labels: [ "Red", "Blue", "Yellow", "Green", "Purple", "Orange" ], 
      name: "Example Chart", 
      datasets: [
        {
          label: "My First dataset", 
          data: [65, 59, 90, 81, 56, 55, 40]
        },
        {
          label: "My Second dataset",
          data: [28, 48, 40, 19, 96, 27, 100]
        }
      ]
    }
  ]
};

export default function chart( state = initialState, action ) {
  switch(action.type) {
    case CREATE_CHART:
      return {
        activeChartIndex: 0,
        charts: [ action.chart, ...state.charts ]
      };
    default:
      return state;
  }
}

export function createChart(labels, name) {
  return {
    chart: { labels, name, datasets: [] },
    type: CREATE_CHART
  };
}

Step 7

Summary

In this step, we'll import the createChart action creator into the App component, connect our action creator, and then pass it down as a prop into our NewChart component.

Instructions

Open src/components/App.js.
Import createChart from src/ducks/chart.js after the import for ./App.css.
Connect the createChart action creator:
- Where we export our decorated App component add an object after mapStateToProps as a second parameter.
- Inside this new object add createChart.
Deconstruct props at the top of the render method.
- Hint: mapStateToProps can tell you what props App will have.
- Hint: Action creators are also added to props since we created a second parameter for connect.
Locate where we render NewChart in the render method of App:
- Add a prop to NewChart called createChart and set it equal to createChart from App's props.

Detailed Instructions

Let's begin by opening src/components/App.js. At the top of the file, just after the import of ./App.cs, import the createChart action creator from our chart reducer.

import { createChart } from '../ducks/chart';

Now that App.js has access to our action creator, we need a way for our App component to dispatch this action to our reducer. We can do this by adding an object after mapStateToProps where we export our decorated component.

export default connect(mapStateToProps, { createChart })(App);

Basically, this is allowing us to directly call this.props.createChart inside of our App component. Without doing it this way, you would have to use the dispatch function with the action creator as a parameter. Redux automatically adds the dispatch function to props. It would look like: this.props.dispatch(this.props.createChart).

Also another thing to note is that once we create this object of action creators, dispatch is no longer automatically added to props. Any future action creators will have to be added to this object as well in order to be used in the App component.

The magic behind connect wrapping action creators

It may feel a little like magic, but the wrapping of action creators in dispatch is fairly simple! The actual source code will be different, but this is accomplishing the same thing.

// Take in an object of action creators, i.e { createChart }
function wrapActionCreator( actionCreatorsObject ) {
  // A new object that will hold the wrapped action creators
  const wrappedActionCreators = {};
  // Iterate over each action creator in the object
  for ( let actionCreator in actionCreatorsObject ) {
    // Creating a new function to capture arguments to the action creator
    // such as "labels" and "name"
    wrappedActionCreators[ actionCreator ] = ( ...args ) => {
      // Create the action, passing in the captured arguments
      const action = actionCreatorsObject[ actionCreator ]( ...args );
      // Dispatch the action to Redux
      dispatch( action );
    }
  }
  return wrappedActionCreators;
}

Now that our action creator is ready to be used, let's pass it down as a prop to our NewChart component. Before we pass down our prop, let's add createChart to our deconstruction of props at the top of the render method. This will allow us to avoid having to use this.props.propNameHere every time we want to refer to a prop.

render() {
  const {
      activeChart,
      charts,
      createChart
  } = this.props;
}

Now we can pass down our createChart prop where we render NewChart.

<NewChart createChart={ createChart } />

This prop will then be used later by the NewChart component to dispatch an action for creating a new chart to our chart reducer.

Solution

src/components/App.js

import React, { Component } from "react";
import { connect } from "react-redux";

import "./App.css";

import { createChart } from '../ducks/chart';

import NewChart from "./NewChart/NewChart";
import Sidebar from "./Sidebar/Sidebar";
import AddDataset from "./AddDataset/AddDataset";

class App extends Component {
  render() {
    const {
      activeChart,
      charts,
      createChart
    } = this.props;
    
    return (
      <div className="app">
        <Sidebar />
        <main className="app__main">
          <header className="app__header">
            <h1 className="app__title">Categorizer</h1>

            <div className="app__new-chart">
              <NewChart createChart={ createChart } />
            </div>
          </header>
        </main>
      </div>
    );
  }
}

function mapStateToProps( { activeChartIndex, charts } ) {
  return {
    activeChart: charts[ activeChartIndex ],
    charts: charts
  };
}

export default connect(mapStateToProps, { createChart })(App);

Step 8

Summary

In this step, we will start making our NewChart component functional by creating a constructor method, state, and a handleChange method to handle user input.

Instructions

Open src/components/NewChart/NewChart.js.
Create a constructor method, just above the render method, that takes props as a parameter:
- This method should call super with props as a parameter.
- This method should create a state object with the following properties:
  - labels - A list of the labels submitted so far. It should default to an empty array.
  - name - The text from the name input. It should default to an empty string.
  - newLabel - The text from the new label input. It should default to an empty string.
Create a handleChange method, just below the constructor method, for handling user input. It should take two parameters:
- field - The name of the field that is changing.
- event - The change event object holding the new value.
Bind this to the handleChange method at the bottom of the constructor method:
- Create two different variants of handleChange, one for handleNameChange and one for handleInputChange. Both should be equal to this.handleChange.bind(this, "") with the string being the property on state to update.
  - this.handleNameChange = this.handleChange.bind(this, "name");
  - this.handleLabelChange = this.handleChange.bind(this, "newLabel");
Deconstruct state at the top of the render method.
Locate the input with the className of "new-chart__name new-chart__input":
- Create an onChange prop that calls this.handleNameChange.
- Create a value prop equal to name.
Locate the input with the className of "new-chart__category new-chart__input":
- Create an onChange prop that calls this.handleLabelChange.
- Create a value prop equal to newLabel.

Detailed Instructions

Let's begin by opening src/components/NewChart/NewChart.js. Just above the render method, add a constructor method that takes props as its first parameter. Then call super with props as a parameter inside the constructor method. After calling super, create a state object with three properties:

labels - A list of the labels submitted so far. It should default to an empty array.
name - The text from the name input. It should default to an empty string.
newLabel - The text from the new label input. It should default to an empty string.

constructor( props ) {
  super( props );

  this.state = {
    labels: [],
    name: '',
    newLabel: ''
  };
}

Now that our initial state is ready to go for our NewChart component, let's create a handleChange method. handleChange will have two parameters:

field - The name of the field that is changing, in this case that will be "name" or "newLabel".
event - The DOM event triggering the change and carrying the new value.

All this method needs to do is update the specified field on state with the specified value.

handleChange(field, event) {
  this.setState({ [ field ]: event.target.value });
}

Now that our handleChange method is created, let's bind this and the field we want to change to it at the bottom of the constructor method. We'll want to make two different variants of handleChange. One for updating name and one for updating label. Let's call them handleNameChange and handleLabelChange.

constructor( props ) {
  super( props );

  this.state = {
    labels: [],
    name: '',
    newLabel: ''
  };

  this.handleNameChange = this.handleChange.bind( this, "name" );
  this.handleLabelChange = this.handleLabelChange.bind( this, "newLabel" );
}

Now let's destructure labels, name, and newLabel from this.state at the top of the render method so we can refer to them witout having to use this.state.

render() {
  const {
    labels,
    name,
    newLabel
  } = this.state;
}

We're now ready to hook up our handleChange method to the input fields for chart name and chart label.

Locate the input element with the className of "new-chart__name new-chart__input". Let's add an onChange prop to it that equals this.handleNameChange. Since we bound this and the field we want to update in the constructor we are good to go. Next let's add a value prop on the input element equal to name. Since we deconstructed state we didn't have to use this.state.name.

<input
  className="new-chart__name new-chart__input"
  type="text"
  onChange={ this.handleNameChange }
  value={ name }
/>

Now let's repeat the same exact steps for the input element with the className of "new-chart__category new-chart__input". However, change the onChange prop to equal this.handleLabelChange and change the value prop to equal newLabel.

<input
  className="new-chart__category new-chart__input"
  required
  type="text"
  onChange={ this.handleLabelChange }
  value={ newLabel }
/>

Solution

src/components/NewChart/NewChart.js

import React, { Component, PropTypes } from "react";

import "./NewChart.css";

export default class NewChart extends Component {
  static propTypes = { createChart: PropTypes.func.isRequired };

  constructor( props ) {
    super( props );

    this.state = {
      labels: [],
      name: '',
      newLabel: ''
    };

    this.handleNameChange = this.handleChange.bind( this, "name" );
    this.handleLabelChange = this.handleChange.bind( this, "newLabel" );
  }

  handleChange(field, event) {
    this.setState({ [field]: event.target.value });
  }

  render() {
    const {
      labels,
      name,
      newLabel
    } = this.state;
    return (
      <div className="new-chart">
        <div className="new-chart__form-group">
          <label className="new-chart__label">Chart Name:</label>
          <input
            className="new-chart__name new-chart__input"
            type="text"
            onChange={ this.handleNameChange }
            value={ name }
          />
        </div>
        <form className="new-chart__form-group">
          <label className="new-chart__label">Add Label:</label>
          <input
            className="new-chart__category new-chart__input"
            required
            type="text"
            onChange={ this.handleLabelChange }
            value={ newLabel }
          />
        </form>

        <div className="new-chart__labels-wrapper">
          <label className="new-chart__label">Labels:</label>
          <span className="new-chart__labels">[] (Min. 3)</span>
        </div>

        <button className="new-chart__submit">
          Submit
        </button>
      </div>
    );
  }
}

Step 9

Summary

In this step, we will continue to make our NewChart component functional by handling adding new labels.

Instructions

Open src/components/NewChart/NewChart.js.
Create a new class method called addLabel, just below the handleChange method, that takes an event object as the first parameter.
- This method should call event.preventDefault(); so the browser doesn't refresh.
- Then the method should use setState to update the following properties on state:
  - labels - Should equal the previous list of labels from state with the new label added to the end.
  - newLabel - Should then be reset back to its default value of ''.
Bind this to addLabel at the bottom of the constructor method.
Add an onSubmit prop to the form element with the className of "new-chart__form-group".
- It should call this.addLabel.
Change the span with the className of "new-chart__labels" to display the current labels from state inside [ ].
- For example, if I had the labels green and red:
  - "[ green, red ] (Min. 3)"

Detailed Instructions

Let's begin by opening src/components/NewChart/NewChart.js. After the handleChange method, let's create a new method called addLabel. addLabel will take a single event parameter. This method should call event.preventDefault(), to prevent a browser refresh, and then use this.setState() to update two properties on state. It should update this.state.labels to equal a new array of all the previous labels with the new label at the end. It should also set newLabel back to it's default value afterwards.

addLabel(event) {
  event.preventDefault();
  this.setState({
    labels: [ ...this.state.labels, this.state.newLabel ],
    newLabel: ''
  });
}

Now that our method is built out, let's bind this to addLabel at the bottom of the constructor method.

this.addLabel = this.addLabel.bind( this );

Then we can assign an onSubmit prop to the form element with the className of "new-chart__form-group". This will allow us to press the enter key when typing in the input field to execute our addLabel method.

<form className="new-chart__form-group" onSubmit={ this.addLabel }>

Now we'll need to update the span element with the className of "new-chart__labels" to show our labels. Inside the [ ] we can use { } to call on labels. Let's use the array prototype join to join our labels by a comma and a space.

<span className="new-chart__labels">[ { labels.join(', ') } ] (Min. 3)</span>

Solution

src/components/NewChart/NewChart.js

import React, { Component, PropTypes } from "react";

import "./NewChart.css";

export default class NewChart extends Component {
  static propTypes = { createChart: PropTypes.func.isRequired };

  constructor( props ) {
    super( props );

    this.state = {
      labels: [],
      name: '',
      newLabel: ''
    };

    this.handleNameChange = this.handleChange.bind( this, "name" );
    this.handleLabelChange = this.handleChange.bind( this, "newLabel" );
    this.addLabel = this.addLabel.bind( this );
  }

  handleChange(field, event) {
    this.setState({ [field]: event.target.value });
  }
  
  addLabel(event) {
    event.preventDefault();
    this.setState({
      labels: [ ...this.state.labels, this.state.newLabel ],
      newLabel: ''
    });
  }

  render() {
    const {
      labels,
      name,
      newLabel
    } = this.state;
    return (
      <div className="new-chart">
        <div className="new-chart__form-group">
          <label className="new-chart__label">Chart Name:</label>
          <input
            className="new-chart__name new-chart__input"
            type="text"
            onChange={ this.handleNameChange }
            value={ name }
          />
        </div>
        <form className="new-chart__form-group" onSubmit={ this.addLabel }>
          <label className="new-chart__label">Add Label:</label>
          <input
            className="new-chart__category new-chart__input"
            required
            type="text"
            onChange={ this.handleLabelChange }
            value={ newLabel }
          />
        </form>

        <div className="new-chart__labels-wrapper">
          <label className="new-chart__label">Labels:</label>
          <span className="new-chart__labels">[ { labels.join(', ') } ] (Min. 3)</span>
        </div>

        <button className="new-chart__submit">
          Submit
        </button>
      </div>
    );
  }
}

You should now be able to go into your app and try putting in labels by typing in the label input field and pressing enter. You should see the text underneath update every time you press enter.

Step 10

Summary

In this step, we will finish the functionality for our NewChart component by sending data to our reducer through the prop createChart.

Instructions

Open src/components/NewChart/NewChart.js.
Create a new class method called submitChart just below the addLabel method.
- This method should exit by calling return if this.state.name is falsy or there aren't at least 3 labels.
- Otherwise this method should call this.props.createChart with two arguments:
  - The first argument should be the labels array from state.
  - The second argument should be the name string from state.
- Then the method should use this.setState to set all state values back to their default values.
Bind this to submitChart at the bottom of the constructor method.
Add an onClick prop that calls submitChart on the element with the className of "new-chart__submit".

Detailed Instructions

Let's begin by opening src/components/NewChart/NewChart.js and creating our last class method called submitChart just below the addLabel method. This method won't need any parameters. The first thing the method should do is check to see if this.state.name is not falsy and that this.state.labels has 3 or more labels. If either of these conditions aren't met our method should call return to exit the method early.

submitChart() {
  if ( !this.state.name || this.state.labels.length < 3 ) {
    return;
  }
}

If both conditions are met then we should then call this.props.createChart with our labels and name from state.

submitChart() {
  if ( !this.state.name || this.state.labels.length < 3 ) {
    return;
  }

  this.props.createChart(this.state.labels, this.state.name);
}

Finally our method should reset all state values back to their default values using setState.

submitChart() {
  if ( !this.state.name || this.state.labels.length < 3 ) {
    return;
  }

  this.props.createChart(this.state.labels, this.state.name);
  this.setState({ 
    labels: [],
    name: '',
    newLabel: ''
  });
}

Now that our method is built, let's bind this to it at the bottom of the constructor method.

this.submitChart = this.submitChart.bind( this );

Now all that's left is to hook up our method to our Submit button using an onClick prop. Locate the button element with the className of "new-chart__submit" and add an onClick that calls our submitChart method.

<button className="new-chart__submit" onClick={ this.submitChart }>
  Submit
</button>

Solution

src/components/NewChart/NewChart.js

import React, { Component, PropTypes } from "react";

import "./NewChart.css";

export default class NewChart extends Component {
  static propTypes = { createChart: PropTypes.func.isRequired };

  constructor( props ) {
    super( props );

    this.state = {
      labels: [],
      name: '',
      newLabel: ''
    };

    this.handleNameChange = this.handleChange.bind( this, "name" );
    this.handleLabelChange = this.handleChange.bind( this, "newLabel" );
    this.addLabel = this.addLabel.bind( this );
    this.submitChart = this.submitChart.bind( this );
  }

  handleChange(field, event) {
    this.setState({ [field]: event.target.value });
  }
  
  addLabel(event) {
    event.preventDefault();
    this.setState({
      labels: [ ...this.state.labels, this.state.newLabel ],
      newLabel: ''
    });
  }

  submitChart() {
    if ( !this.state.name || this.state.labels.length < 3 ) {
      return;
    }

    this.props.createChart(this.state.labels, this.state.name);
    this.setState({ 
      labels: [],
      name: '',
      newLabel: ''
    });
  }

  render() {
    const {
      labels,
      name,
      newLabel
    } = this.state;
    return (
      <div className="new-chart">
        <div className="new-chart__form-group">
          <label className="new-chart__label">Chart Name:</label>
          <input
            className="new-chart__name new-chart__input"
            type="text"
            onChange={ this.handleNameChange }
            value={ name }
          />
        </div>
        <form className="new-chart__form-group" onSubmit={ this.addLabel }>
          <label className="new-chart__label">Add Label:</label>
          <input
            className="new-chart__category new-chart__input"
            required
            type="text"
            onChange={ this.handleLabelChange }
            value={ newLabel }
          />
        </form>

        <div className="new-chart__labels-wrapper">
          <label className="new-chart__label">Labels:</label>
          <span className="new-chart__labels">[ { labels.join(', ') } ] (Min. 3)</span>
        </div>

        <button className="new-chart__submit" onClick={ this.submitChart }>
          Submit
        </button>
      </div>
    );
  }
}

Step 11

Summary

In this step, we will be rendering the active chart.

Instructions

Open src/components/App.js.
Import the ActiveChart component underneath the import of the SideBar component.
Render the ActiveChart component in the div with the className of "app__active-chart":
- Add a prop to ActiveChart called chart.
- chart should equal the activeChart object from App's props.

Detailed Instructions

Let's begin by opening up src/components/App.js and importing ActiveChart from src/components/ActiveChart/ActiveChart. This will be the component that will display our active chart.

import ActiveChart from "./ActiveChart/ActiveChart";

Inside of the render method's return in App.js, just beneath the closing </header> tag, render the ActiveChart component in the div with the className of "app__active-chart".

return (
  <div className="app">
    <Sidebar />
    <main className="app__main">
      <header className="app__header">
        <h1 className="app__title">Categorizer</h1>

        <div className="app__new-chart">
          <NewChart createChart={ createChart } />
        </div>
      </header>
      <div className="app__active-chart">
        <ActiveChart />
      </div>
    </main>
  </div>
);

Next, let's give our ActiveChart component a prop called chart that is equal to the activeChart object from App's props. If we take a look at our application now in the browser, we should see that it is showing our first chart from initialState in chart.js. Also if we add a new chart, we should see that new chart render for us.

<div className="app__active-chart">
  <ActiveChart chart={ activeChart } />
</div>

Solution

src/components/App.js

import React, { Component } from "react";
import { connect } from "react-redux";

import "./App.css";

import { createChart } from '../ducks/chart';

import NewChart from "./NewChart/NewChart";
import Sidebar from "./Sidebar/Sidebar";
import AddDataset from "./AddDataset/AddDataset";
import ActiveChart from "./ActiveChart/ActiveChart";

class App extends Component {
  render() {
    const {
      activeChart,
      charts,
      createChart
    } = this.props;
    
    return (
      <div className="app">
        <Sidebar />
        <main className="app__main">
          <header className="app__header">
            <h1 className="app__title">Categorizer</h1>

            <div className="app__new-chart">
              <NewChart createChart={ createChart } />
            </div>
          </header>
          <div className="app__active-chart">
            <ActiveChart chart={ activeChart } />
          </div>
        </main>
      </div>
    );
  }
}

function mapStateToProps( { activeChartIndex, charts } ) {
  return {
    activeChart: charts[ activeChartIndex ],
    charts: charts
  };
}

export default connect(mapStateToProps, { createChart })(App);

Step 12

Summary

In this step, we will update our chart reducer to handle an action for setting the new active chart.

Instructions

Open src/ducks/chart.js.
Create an action type called SET_ACTIVE_CHART_INDEX that equals "SET_ACTIVE_CHART_INDEX".
Create and export an action creator called setActiveChartIndex:
- This function should take in one parameter:
  - index - This will be an integer of the new active chart's index.
- This function should return an object with two properties:
  - index - This should equal the passed in index.
  - type - This should equal SET_ACTIVE_CHART_INDEX.
Add a case for SET_ACTIVE_CHART_INDEX to the switch statement in the chart reducer:
- This case should be above the default case.
- This case should return an object with two properties:
  - activeChartIndex - This should equal the index given on action.
  - charts - This should equal the charts array on state.

Detailed Instructions

Let's being by opening src/ducks/chart.js. At the top of the file, create a new action type of SET_ACTIVE_CHART_INDEX and set it equal to "SET_ACTIVE_CHART_INDEX".

const SET_ACTIVE_CHART_INDEX = "SET_ACTIVE_CHART_INDEX";

Underneath the reducer, create a setActiveChartIndex action creator that takes a single parameter: index. This action creator should return an object with two properties: index and type. index should equal the passed in index and type should equal SET_ACTIVE_CHART_INDEX ( the action type we just created ).

export function setActiveChartIndex(index) {
  return {
    index,
    type: SET_ACTIVE_CHART_INDEX
  }
}

Now let's update our chart reducer to handle this new action. Add a case checking against SET_ACTIVE_CHART_INDEX. This case should return a new state object where activeChartIndex is set equal to action.index and charts is set equal to state.charts. Make sure this case appears above the default case.

case SET_ACTIVE_CHART_INDEX:
  return {
    activeChartIndex: action.index,
    charts: state.charts
  }

Solution

src/ducks/chart.js

const CREATE_CHART = "CREATE_CHART";
const SET_ACTIVE_CHART_INDEX = "SET_ACTIVE_CHART_INDEX";

const initialState = {
  activeChartIndex: 0,
  charts: [
    {
      labels: [ "Red", "Blue", "Yellow", "Green", "Purple", "Orange" ], 
      name: "Example Chart", 
      datasets: [
        {
          label: "My First dataset", 
          data: [65, 59, 90, 81, 56, 55, 40]
        },
        {
          label: "My Second dataset",
          data: [28, 48, 40, 19, 96, 27, 100]
        }
      ]
    }
  ]
};

export default function chart( state = initialState, action ) {
  switch(action.type) {
    case CREATE_CHART:
      return {
        activeChartIndex: 0,
        charts: [ action.chart, ...state.charts ]
      };
    case SET_ACTIVE_CHART_INDEX:
      return {
        activeChartIndex: action.index,
        charts: state.charts
      }
    default:
      return state;
  }
}

export function createChart(labels, name) {
  return {
    chart: { labels, name, datasets: [] },
    type: CREATE_CHART
  };
}

export function setActiveChartIndex(index) {
  return {
    index,
    type: SET_ACTIVE_CHART_INDEX
  }
}

Step 13

Summary

In this step, we will update our SideBar component to display a list of charts that have been created. This will allow us to navigate between created charts.

Instructions

Open src/components/App.js.
Add setActiveChartIndex to the import of action creators.
Add setActiveChartIndex to the action creators object in the connect statement.
Destructure setActiveChartIndex from App's props in the render method.
Add two props where we render SideBar:
- charts - Should equal charts from App's props.
- setActiveChartIndex - Should equal setActiveChartIndex from App's props.
Open src/components/SideBar/SideBar.js.
Locate the <ul> element with the className of "sidebar__past-charts":
- Remove the static <li> element that is already there and replace it with { } that contains a map inside.
- Map over charts and keep track of the chart and index:
  - Call the first parameter of the map function chart.
  - Call the second parameter of the map function index.
- Have the map return the following JSX:
  - JSX
    <li className="sidebar__past-chart" key={ chart.name }> <p className="sidebar__chart-name" onClick={ () => setActiveChartIndex( index ) }> { chart.name } </p> <p className="sidebar__chart-datasets">{ chart.datasets.length } Datasets</p> </li>

Detailed Instructions

Head back over to src/components/App.js and import the new setActiveChartIndex action creator so the App component can have access to it.

import { createChart, setActiveChartIndex } from '../ducks/chart';

Now let's add setActiveChartIndex as another property to the action creators object passed to connect so we don't have to worry about calling dispatch when calling our setActiveChartIndex action creator.

export default connect(mapStateToProps, { createChart, setActiveChartIndex })(App);

Now let's destructure setActiveChartIndex from props in the render method so we don't have to refer to it as this.props.setActiveChartIndex.

const {
  activeChart,
  charts,
  createChart,
  setActiveChartIndex
} = this.props;

We now have everything we need from our reducer and we can focus on updating our SideBar component. Let's create two new props where the SideBar component gets rendered. One called charts and another called setActiveChartIndex. The charts prop should equal charts from App's props and setActiveChartIndex prop should equal setActiveChartIndex from App's props.

<Sidebar charts={ charts } setActiveChartIndex={ setActiveChartIndex } />

Let's configure our SideBar component to use these props. Open up src/components/Sidebar/Sidebar.js. We'll need to map over the charts passed to this component to create a list of charts. Let's remove the <li> element in the <ul> element with the className of "sidebar__past-charts".

export default function Sidebar( { charts, setActiveChartIndex } ) {
  return (
    <aside className="sidebar">
      <h3 className="sidebar__title">Past Charts</h3>

      <ul className="sidebar__past-charts">
        
      </ul>
    </aside>
  );
}

Inside of the <ul> elment let's create our map by breaking out of JSX with { }. Map over charts and keep track of the current chart and the current index.

<ul className="sidebar__past-charts">
  {
    charts.map( ( chart, index ) => (

    ))
  }
</ul>

Inside the map, return the following JSX:

<ul className="sidebar__past-charts">
  {
    charts.map( ( chart, index ) => (
      <li className="sidebar__past-chart" key={ chart.name }>

        <p className="sidebar__chart-name" onClick={ () => setActiveChartIndex( index ) }>
          { chart.name }
        </p>

        <p className="sidebar__chart-datasets">{ chart.datasets.length } Datasets</p>
      </li>
    ))
  }
</ul>

You should now be able to click on different charts in the SideBar and see the active chart render in on the right.

Solution

src/components/Sidebar.js

import React, { PropTypes } from "react";

import "./Sidebar.css";

export default function Sidebar( { charts, setActiveChartIndex } ) {
  return (
    <aside className="sidebar">
      <h3 className="sidebar__title">Past Charts</h3>

      <ul className="sidebar__past-charts">
        {
          charts.map( ( chart, index ) => (
            <li className="sidebar__past-chart" key={ chart.name }>
              <p className="sidebar__chart-name" onClick={ () => setActiveChartIndex( index ) }>
                { chart.name }
              </p>

              <p className="sidebar__chart-datasets">{ chart.datasets.length } Datasets</p>
            </li>
          ))
        }
      </ul>
    </aside>
  );
}

Sidebar.propTypes = {
  charts: PropTypes.arrayOf( PropTypes.object ).isRequired,
  setActiveChartIndex: PropTypes.func.isRequired
};

Step 14

Summary

In this step, we will update our chart reducer to handle an action for adding new datasets to a chart.

Instructions

Open src/ducks/chart/js.
Create an action type called ADD_DATASET that equals "ADD_DATASET".
Create and export an action creator called addDataset:
- This function should take in one parameter:
  - dataset - This will be an array of numbers that correspond to the labels on the chart.
- This function should return an object with two properties:
  - dataset - This should equal the value of the datasets parameter.
  - type - This should equal ADD_DATASET.
Add a case for ADD_DATASET to the switch statement in the chart reducer:
- This case should be above the default case.
- This case should return an object with two properties:
  - activeChartIndex - This should equal the activeChartIndex on state.
  - charts - This should equal a new array of charts from state:
    - The order of charts must remain the same.
    - The chart we are adding a dataset to must be a new object.
    - The order of the datasets must remain the same.
    - The new dataset must be added to the end of the datasets array.

Detailed Instructions

Let's begin by opening src/ducks/chart.js. Create a new action type of ADD_DATASET at the top of the file that equals "ADD_DATASET".

const ADD_DATASET = "ADD_DATASET";

Underneath the reducer, create and export the corresponding action creator: addDataset. addDataset will take a single parameter dataset and should return an object with two properties:

dataset - This will be an array of numbers that corresponds to the labels on the chart. This should equal the value of the dataset parameter.
type - Should equal our action type: ADD_DATASET.

export function addDataset(dataset) {
  return {
    dataset,
    type: ADD_DATASET
  }
}

Lastly, we need to update the reducer to handle this action. Add a case checking the action.type against ADD_DATASET. For this case we will need to return a new object where activeChartIndex is set equal to state.activeChartIndex and charts is is a copy of state.charts with the new dataset added to the active chart.

We'll need to use a local variable to accomplish this so let's wrap our case in { } to avoiding any scoping issues. Our local variable will be called activeChart and it should equal the chart object of the chart that is currently active.

case ADD_DATASET: {
  const activeChart = state.charts[ state.activeChartIndex ];
  return {

  }
}

Now that we know which chart is active, we can create a new object for it that has the new dataset added to it. Remember that we also want to return the activeChartIndex and all charts before and after the active chart.

case ADD_DATASET: {
  const activeChart = state.charts[ state.activeChartIndex ];
  return {
    activeChartIndex: state.activeChartIndex,
    charts: [
      ...state.charts.slice( 0, state.activeChartIndex ),
      Object.assign({}, activeChart, { datasets: [ ...activeChart.datasets, action.dataset ] }),
      ...state.charts.slice( state.activeChartIndex + 1, state.charts.length )
    ]
  }
}

There is a lot going on here, let's break it down. We start by creating a new array for charts. Next we want to keep the charts in the same order, so we need to put all the charts before the active chart at the beginning of the charts array. Using the ES2015 spread operator, we can combine it with slice to get all the charts up until our active chart. Then we can insert our active chart as a new object that has datasets modified to be an array of all the previous datasets with our new dataset from action at the end of the array. Then using the spread operator again we can get all the charts after our active chart and add it to the end of charts array.

In addition to this, we can also deconstruct state so we don't have to use state. every where. Our final solution would look like:

case ADD_DATASET: {
  const { activeChartIndex, charts } = state;
  const activeChart = charts[ activeChartIndex ];
  return {
    activeChartIndex,
    charts: [
      ...charts.slice( 0, activeChartIndex ),
      Object.assign({}, activeChart, { datasets: [ ...activeChart.datasets, action.dataset ] }),
      ...charts.slice( activeChartIndex + 1, charts.length )
    ]
  }
}

Solution

src/ducks/chart.js

const CREATE_CHART = "CREATE_CHART";
const SET_ACTIVE_CHART_INDEX = "SET_ACTIVE_CHART_INDEX";
const ADD_DATASET = "ADD_DATASET";

const initialState = {
  activeChartIndex: 0,
  charts: [
    {
      labels: [ "Red", "Blue", "Yellow", "Green", "Purple", "Orange" ], 
      name: "Example Chart", 
      datasets: [
        {
          label: "My First dataset", 
          data: [65, 59, 90, 81, 56, 55, 40]
        },
        {
          label: "My Second dataset",
          data: [28, 48, 40, 19, 96, 27, 100]
        }
      ]
    }
  ]
};

export default function chart( state = initialState, action ) {
  switch(action.type) {
    case CREATE_CHART:
      return {
        activeChartIndex: 0,
        charts: [ action.chart, ...state.charts ]
      };
    case SET_ACTIVE_CHART_INDEX:
      return {
        activeChartIndex: action.index,
        charts: state.charts
      }
    case ADD_DATASET: {
      const { activeChartIndex, charts } = state;
      const activeChart = charts[ activeChartIndex ];
      return {
          activeChartIndex, 
          charts: [
            ...charts.slice( 0, activeChartIndex ), 
            Object.assign({}, activeChart, { datasets: [ ...activeChart.datasets, action.dataset ] }), 
            ...charts.slice( activeChartIndex + 1, charts.length )
        ]
      }
    }
    default:
      return state;
  }
}

export function createChart(labels, name) {
  return {
    chart: { labels, name, datasets: [] },
    type: CREATE_CHART
  };
}

export function setActiveChartIndex(index) {
  return {
    index,
    type: SET_ACTIVE_CHART_INDEX
  }
}

export function addDataset(dataset) {
  return {
    dataset,
    type: ADD_DATASET
  }
}

Step 15

Summary

In this step, we will connect our addDataset action creator in the App component. We'll then render the AddDataset component in App and pass down the addDataset action creator as a prop to it.

Instructions

Open src/components/App.js.
Add addDataset to the import of action creators.
Add addDataset to the action creators object in the connect statement.
Destructure addDataset from App's props in the render method.
Render the AddDataset component underneath the ActiveChart component.
- Add two props to the AddDataset component:
  - addDataset - This should equal the addDataset action creator.
  - labels - This should equal the array of labels from the activeChart prop.

Detailed Instructions

Let's begin by opening src/components/App.js and import the addDataset action creator so the App component can have access to it.

import { createChart, setActiveChartIndex, addDataset } from '../ducks/chart';

Now let's add addDataset as another property to the action creator object passed to connect so don't have to worry about calling dispatch when calling our addDataset action creator.

export default connect(mapStateToProps, { createChart, setActiveChartIndex, addDataset })(App);

Now let's destructure addDataset from props in the render method so we don't have to refer to it as this.props.addDataset.

const {
  activeChart,
  charts,
  createChart,
  setActiveChartIndex,
  addDataset
} = this.props;

We now have everything we need from our reducer and we can focus on our AddDataset component. Let's begin by adding the AddDataset component into App's render method just below the ActiveChart component. This component should have two props: addDataset and labels. addDataset should equal our addDataset action creator and labels should equal the activeChart's labels array.

return (
  <div className="app">
    <Sidebar charts={ charts } setActiveChartIndex={ setActiveChartIndex } />
    <main className="app__main">
      <header className="app__header">
        <h1 className="app__title">Categorizer</h1>

        <div className="app__new-chart">
          <NewChart createChart={ createChart } />
        </div>
      </header>
      <div className="app__active-chart">
        <ActiveChart chart={ activeChart } />
        <AddDataset addDataset={ addDataset } labels={ activeChart.labels } />
      </div>
    </main>
  </div>
);

You should now be able to add datasets to charts.

Solution

src/components/App.js

import React, { Component } from "react";
import { connect } from "react-redux";

import "./App.css";

import { createChart, setActiveChartIndex, addDataset } from '../ducks/chart';

import NewChart from "./NewChart/NewChart";
import Sidebar from "./Sidebar/Sidebar";
import ActiveChart from "./ActiveChart/ActiveChart";
import AddDataset from './AddDataset/AddDataset';

class App extends Component {
  render() {
    const {
      activeChart,
      charts,
      createChart,
      setActiveChartIndex,
      addDataset
    } = this.props;
    
    return (
      <div className="app">
        <Sidebar charts={ charts } setActiveChartIndex={ setActiveChartIndex } />
        <main className="app__main">
          <header className="app__header">
            <h1 className="app__title">Categorizer</h1>

            <div className="app__new-chart">
              <NewChart createChart={ createChart } />
            </div>
          </header>
          <div className="app__active-chart">
            <ActiveChart chart={ activeChart } />
            <AddDataset addDataset={ addDataset } labels={ activeChart.labels } />
          </div>
        </main>
      </div>
    );
  }
}

function mapStateToProps( { activeChartIndex, charts } ) {
  return {
    activeChart: charts[ activeChartIndex ],
    charts: charts
  };
}

export default connect(mapStateToProps, { createChart, setActiveChartIndex, addDataset })(App);

Black Diamond

Right now all data is lost on refresh, look into using localStorage to save a user's data.
Currently the color of datasets is randomized. Try allowing users to select colors for their datasets.

Contributions

If you see a problem or a typo, please fork, make the necessary changes, and create a pull request so we can review your changes and merge them into the master repo and branch.

Copyright

© DevMountain LLC, 2017. Unauthorized use and/or duplication of this material without express and written permission from DevMountain, LLC is strictly prohibited. Excerpts and links may be used, provided that full and clear credit is given to DevMountain with appropriate and specific direction to the original content.

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