Manifest based userAgent example
bookmarklet (ish) example
direct function injection example

this gives an example of every type of useage as well as implementing the customUserAgentScript in example5 of the js/bookmarklet.js file.

The code will automatically use the data from your manifest file to build its specific user agent. You can further customize the code if you like, but if we all keep it somewhat similar it will help webpage owners see how many users are using chrome apps to view their site. This will help our community as a whole gain traction without confusing website/app developers marketers and owners.

https://chrome.google.com/webstore/detail/set-user-agent-app-webvie/mpbnpaonopfcidhkmpmfbjflikfafape

example icon author : AhaSoft
example icon license : CC Attribution Non-Commercial No Derivatives

JitterBeast belongs to and was created by The Oatmeal if you don't know who that is, welcome to a new chapter of your previously mindnumbingly boring existance.

First include the code from runWebviewJS.js in your background (copy & paste) or instance code (as a script tag).

Then listen for the webview to start loading. Either with an annonymous or shared handler function.

Shared (best performance)

function webviewStarted(e){
    ....Do stuff...
}

document.querySelector('webview').addEventListener(
    'loadstart',
    webviewStarted
);

Annonymous (function created on the fly each time)

function webviewStarted(e){
    ....Do stuff...
}

document.querySelector('webview').addEventListener(
    'loadstart',
    function(e){
        ...Do stuff...
    }
);

Next, in your handler function, set the code to send your code or file

runWebviewJS(
    el,             (webview element)
    code,           (code to run OR filename)
    runASAP,        (run code as soon as possible) *false
    requiresGlobal, (needs explicit access to webview window global scope) *false
    isFile,         (load file from app dir) *false
    data            (template object with variables to replace in file) *false
)

Example data object

{
    hello   : 'world',
    numNum  : function(){
        return Math.floor(
            Math.rand()*1000
        );
    }
}

${hello} will be replaced with 'world' and
${numNum} will be replaced with a randomly generated whole number from 0 to 1000 in the specified file. This is only for files. Code snippits should be sent as desired for use or removed into a template file.

Example code ALL CODE MUST BE SENT WRAPPED IN A FUNCTION TO LIMIT SCOPE

function(){
    function bodyClick(e){
        console.log(e);
    }
    
    document.body.addEventListener(
        'click',
        bodyClick
    );
}

OR you can send the same thing as a string. One might want to do this to add in custom constants or variables from the parent scope before sending to the webview.

"function(){function bodyClick(e){console.log(e);}document.body.addEventListener('click',bodyClick);}"

if you want to use a file the code paramater will be the name of the file.

'js/my-awesome-webview-code.js'

Please feel free to leave questions bug requests or any feedback at all.

Special thanks to Fady Samuel and Ken Rockot who helped me point me in the right direction to achive what I was looking for in this.

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