Open dialogs (bootstrap modals) in blazor with awaitable calls.

1. As mentioned this uses bootstrap modals (bootstrap 4+). This means it is dependent on jquery and bootstrap javascript references that isn't imported in the default blazor templates. Make sure you add these imports. Here are some useful links:

   jQuery: https://code.jquery.com/

   bootstrap: https://www.bootstrapcdn.com/

   bootstrap (older versions): https://www.bootstrapcdn.com/legacy/bootstrap/

2. This nuget aims at functionality and doesn't come with a any UI/css out of the box. You can use any boiler-plate boostrap modal code.

1. Install the nuget package

   install-package Blazing.Dialog

2. Import the script file in your index.html

   <script src="_content/Blazing.Dialog/scripts.js"></script>

3. In the _imports.razor file, add the following import:

   @using Blazing.Dialog

Create a new instance of the DialogAccess class;

readonly DialogAccess dialog = new DialogAccess();

You can now open this dialog by calling dialog.OpenAsync(). OpenAsync will only work when dialog is bound to a dialog UI (next section)

// do something before the dialog is opened
await dialog.OpenAsync();
// do something after the  is closed

You can programatically close the dialog by calling dialog.CancelAsync() at any time.

It is often helpful if the OpenAsync function returned some data relating to a selection in the dialog. Here are some examples

• A confirmation dialog can return a bool. It can return true only when the user clicks "Yes".
• A dialog can display a list of options and can return a string representing the selection.
• A dialog can display a list of options and return an int representing the Id of the selection.

All above examples can be found in the blazor sample project in this repo.

To make the OpenAsync function return a type of your choice, you can use the generic DialogAccess class. Your declaration would change to:

readonly DialogAccess<string> dialog = new DialogAccess<string>();

Next, to make the OpenAsync complete and return a specific string, you can call dialog.CompleteAsync("my response") while the dialog is still open. This code normally goes in a blazor onclick event. See the "ConfirmationDialog.razor" and "OptionsDialog.razor" pages in the blazor sample for detailed examples.

Add the DialogControl component and assign the Access property to the dialog field created above.

<DialogControl Access=dialog>
<!-- Add your own modal content here -->
</DialogControl>

The DialogControl creates a div with a "modal" class. You can add any boiler plate code "modal-content" code for bootstrap 4 modals. Here is one sample: https://www.w3schools.com/bootstrap4/bootstrap_modal.asp.