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How to call a controller action using Javascript $.get - Yii?

So, recently I've been trying to call a controller action via javascript $.get. I was suggested by a fellow Stack Overflow member to use
$.get("custom/balance", function(){ });
Where custom is the name of the controller that I am using and balance is actionBalance()—a function that I have declared inside of that controller. I have tried to do so but it seems that the function is not being called. I have placed intentional errors inside of that function so I am sure it is not being called via the $.get function.
previously, I had directed $.get to a file in assets like so
$.get("assets/balance.php, function() { });
This had worked perfectly.
Finally, here is the actionBalance that I have declared - is it possible that I need to then call that function? I'm not sure why custom/balance is not calling the action itself.
public function actionBalance() {
// Return a string
echo '7000';
}

I apologize for the previously incomplete answer which left you confused, as I assumed everyone would want to remove the index.php script name from the URL.
If you are using the default settings, yes, you should add the index.php?r= before the path. index.php is called the entry script in Yii. Other files are hidden/protected from the public in the protected folder.
To hide this entry script from the URL, please follow this tutorial on Yii's website:
Yii 1.1: Url: hide index.php

Play Framework - Defining my Javascript file within a function

I'm using the Play Framework and am trying to define a javascript file within a function in another javascript file (the reason being that I don't want these functions to be usable outside of the container function).
So I have two javascripts files, ./public/javascripts/main.js, ./public/javascript/custom.js.
From my html pages (index.scala.html) I define this as follows:
<script src="#routes.Assets.at("javascripts/main.js")"></script>
Using "#routes...." doesn't work in main.js, so I tried adding the following:
$.getScript("public/javascripts/custom.js", function(){
alert("Script loaded and executed.");
});
I've tried a variety of paths but it always says it can't find it.
Any idea how to do this in Play please? Looked through as much documentation as I can and nothing is there...
Any help would be brilliant!
Thank you.
Kind Regards,
Gary Shergill

Make sure you have the following declaration in your routes file:
# Map static resources from the /public folder to the /assets URL path
GET /assets/*file controllers.Assets.at(path="/public", file)
Then the following should work:
$.getScript("/assets/javascripts/custom.js", function(){
alert("Script loaded and executed.");
});

Try to use Javascript Routing mechanism. As described here
Define javascriptRoutes
import play.api.mvc._
object Application extends Controller {
def javascriptRoutes = Action { implicit request =>
import routes.javascript._
Ok(
Routes.javascriptRouter("jsRoutes")(
javascript.Assets.at
)
).as("text/javascript")
}
}
Update your .routes file
GET /routes controllers.Application.javascriptRoutes
Include it into the page:
<script type="text/javascript" src="#routes.Application.javascriptRoutes"></script>
And then use jsRoutes variable in your javascript:
$.getScript(jsRoutes.controllers.Assets.at('javascripts/custom.js').url, function(){
alert("Script loaded and executed.");
});

How to isolate different javascript libraries on the same page?

Suppose we need to embed a widget in third party page. This widget might use jquery for instance so widget carries a jquery library with itself.
Suppose third party page also uses jquery but a different version.
How to prevent clash between them when embedding widgets? jquery.noConflict is not an option because it's required to call this method for the first jquery library which is loaded in the page and this means that third party website should call it. The idea is that third party site should not amend or do anything aside putting tag with a src to the widget in order to use it.
Also this is not the problem with jquery in particular - google closure library (even compiled) might be taken as an example.
What solutions are exist to isolate different javascript libraries aside from obvious iframe?
Maybe loading javascript as string and then eval (by using Function('code to eval'), not the eval('code to eval')) it in anonymous function might do the trick?

Actually, I think jQuery.noConflict is precisely what you want to use. If I understand its implementation correctly, your code should look like this:
(function () {
var my$;
// your copy of the minified jQuery source
my$ = jQuery.noConflict(true);
// your widget code, which should use my$ instead of $
}());
The call to noConflict will restore the global jQuery and $ objects to their former values.

Function(...) makes an eval inside your function, it isn't any better.
Why not use the iframe they provide a default sandboxing for third party content.
And for friendly ones you can share text data, between them and your page, using parent.postMessage for modern browser or the window.name hack for the olders.

I built a library to solve this very problem. I am not sure if it will help you of course, because the code still has to be aware of the problem and use the library in the first place, so it will help only if you are able to change your code to use the library.
The library in question is called Packages JS and can be downloaded and used for free as it is Open Source under a Creative Commons license.
It basically works by packaging code inside functions. From those functions you export those objects you want to expose to other packages. In the consumer packages you import these objects into your local namespace. It doesn't matter if someone else or indeed even you yourself use the same name multiple times because you can resolve the ambiguity.
Here is an example:
(file example/greeting.js)
Package("example.greeting", function() {
// Create a function hello...
function hello() {
return "Hello world!";
};
// ...then export it for use by other packages
Export(hello);
// You need to supply a name for anonymous functions...
Export("goodbye", function() {
return "Goodbye cruel world!";
});
});
(file example/ambiguity.js)
Package("example.ambiguity", function() {
// functions hello and goodbye are also in example.greeting, making it ambiguous which
// one is intended when using the unqualified name.
function hello() {
return "Hello ambiguity!";
};
function goodbye() {
return "Goodbye ambiguity!";
};
// export for use by other packages
Export(hello);
Export(goodbye);
});
(file example/ambiguitytest.js)
Package("example.ambiguitytest", ["example.ambiguity", "example.greeting"], function(hello, log) {
// Which hello did we get? The one from example.ambiguity or from example.greeting?
log().info(hello());
// We will get the first one found, so the one from example.ambiguity in this case.
// Use fully qualified names to resolve any ambiguities.
var goodbye1 = Import("example.greeting.goodbye");
var goodbye2 = Import("example.ambiguity.goodbye");
log().info(goodbye1());
log().info(goodbye2());
});
example/ambiguitytest.js uses two libraries that both export a function goodbye, but it can explicitly import the correct ones and assign them to local aliases to disambiguate between them.
To use jQuery in this way would mean 'packaging' jQuery by wrapping it's code in a call to Package and Exporting the objects that it now exposes to the global scope. It means changing the library a bit which may not be what you want but alas there is no way around that that I can see without resorting to iframes.
I am planning on including 'packaged' versions of popular libraries along in the download and jQuery is definitely on the list, but at the moment I only have a packaged version of Sizzle, jQuery's selector engine.

Instead of looking for methods like no conflict, you can very well call full URL of the Google API on jQuery so that it can work in the application.

<script src="myjquery.min.js"></script>
<script>window.myjQuery = window.jQuery.noConflict();</script>
...
<script src='...'></script> //another widget using an old versioned jquery
<script>
(function($){
//...
//now you can access your own jquery here, without conflict
})(window.myjQuery);
delete window.myjQuery;
</script>
Most important points:
call jQuery.noConflict() method IMMEDIATELY AFTER your own jquery and related plugins tags
store the result jquery to a global variable, with a name that has little chance to conflict or confuse
load your widget using the old versioned jquery;
followed up is your logic codes. using a closure to obtain a private $ for convience. The private $ will not conflict with other jquerys.
You'd better not forget to delete the global temp var.

Javascript "<body onload=...>" in Drupal

I'm trying to integrate a javascript library for drag&drop on tables into one page of my custom Drupal module. I've included the js file using drupal_add_js, but I don't know how to initialize it.
The documentation for that library states that an init function should be called like
<body onload="REDIPS.drag.init()">
How would I do that in Drupal? Or has Drupal some better way of initializing the script?

Drupal has its own mechanism for this, involving adding a property to Drupal.behaviors. See this page: http://drupal.org/node/205296
Drupal.behaviors.redipsDragBehavior = function() {
REDIPS.drag.init();
};
From the linked page:
Any function defined as a property of
Drupal.behaviors will get called when
the DOM has loaded.

You could try adding another drupal_add_js call in the same function as your other add_js:
drupal_add_js('REDIPS.drag.init();','inline','header',true);
The last param "true" is to defer the execution of the script.
I hope that helps in some way!

Zend headScript() and appendFile not working as expected

I'm having an issue trying to append a javascript file using headScript()->appendFile('file name') with Zend. I have my layout setup like this:
<?= $this->headScript()
->prependScript( 'BASE_URL = "' . $this->baseUrl() . '";' )
->appendFile( $this->baseUrl('js/lib/jquery/jquery-1.4.2.min.js') )
->appendFile( $this->baseUrl('js/admin.js') );
?>
Then, in my controller I am trying to append an additional js file only for this page, like:
$this->view->headScript()->appendFile( 'another/js/file.js' );
This file needs to be appended to what is already setup in the layout. However, this file gets added before the other 'appendFile' files. I've also tried
$this->headScript()->offsetSetFile(999, '/js/myfuncs.js');
But this still adds the file before the other files. This is not how I would expect this to work, especially when using the offsetSetFile method. How can I add this file after the other files? Thanks.

The answer is to use headScript()->prependFile in layout.phtml and headScript()->appendFile in a view.

I know it's a late answer but!
If you do appendFile or appendScript is uses the next available index. Thus
$this->headScript()->offsetSetFile(50, 'file');
$this->headScript()->appendFile('file2');
is equivalent to
$this->headScript()->offsetSetFile(50, 'file');
$this->headScript()->offsetSetFile(51, 'file2');
Also it is key to note that the controller code get executed first before the view/layout code. Thus in your case your appends are actually using the id's 1000, and 1001. A quick fix to this is just to explicitly use offsetSetFile for all your appends. So your code in your layout would look like:
<?=
$this->headScript()
->prependScript( 'BASE_URL = "' . $this->baseUrl() . '";' )
->offsetSetFile(500, $this->baseUrl('js/lib/jquery/jquery-1.4.2.min.js') )
->offsetSetFile(501, $this->baseUrl('js/admin.js') );
?>
I hope this helps future googler's

I've noticed that if I 'prepend' all the files in the layout, I can then use appendFile in my controller and it will appear after them. Unfortunately, then I have to list all my JS files in reverse order in the layout (since they prepend to themselves). I'd really like to keep things in order and just be able to append to my layout stack.

If prepending in the layout file is not good enough, you can either include the files in your bootstrap when you set up your view or you could set up a controller plugin if you need to prepend based on what module is being loaded.
// in your bootstrap
protected function _initHeadScript()
{
$this->bootstrap('view');
$view = $this->getResource('view');
$view->headScript()->appendFile('another/js/file.js');
}
// as a plugin
class My_Plugin_HeadScriptPlugin extends Zend_Controller_Plugin_Abstract
{
public function routeStartup(Zend_Controller_Request_Abstract $request)
{
$view = Zend_Controller_Action_HelperBroker::getStaticHelper('viewRenderer')->view;
if($request->getModuleName() == 'foo')
{
$view->headScript()->appendFile('another/js/file.js');
}
}
}

Actually, you don't need get the baseUrl 'cause ZF already does it for you. You just have to pay attention to your path. Do not use the first slash! otherwise ZF will return the remote address.
Just use '$this->_view->headLink()->appendStylesheet('css/main.css');'

http://zendframework.com/issues/browse/ZF-3282?focusedCommentId=23552&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-23552
the last comment gives an excellent solution, first include in the layout at top, then print when you need it, this way it will work