Tuesday, March 11th, 2008
Controller: Event Delegation Library
Category: JavaScript, Library
Brian Moschel has created a new event delegation library called Controller, that aims to help logically organize your event handlers.
- Like other event delegation libraries, it lets you define event handlers that never have to be reattached, even if the HTML is modified.
- Unlike other libraries, controllers group event handlers for a specific set of HTML elements. This links the DOM to your JavaScript in an easy to understand way.
[html]- Laundry
- Dishes
- Walk Dog
[html]
JAVASCRIPT:-
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// event handlers for "todo" elements
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$MVC.Controller("todos",{
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// the onclick event handler
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click: function(){
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alert("clicked todo");
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}
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});
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- You can put CSS queries in the function names and the handler is assigned to any matching element.
JAVASCRIPT:
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// attach to input elements inside ul elements with class "foo"
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"ul.foo input focus": function(params){
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params.element.style.class = 'clicked';
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}
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- AJAX callbacks are simplified.
JAVASCRIPT:
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}, click: function(){
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new Ajax.Request('url', {onComplete: this.continue_to('deleted')});
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}, deleted: function(){
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alert('item deleted');
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You can check out a detailed demo, and the full API.
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A few of the other benefits:
It’s very complete as it works with IE’s submit event.
It calls events in the correct order. For a given event, it calls back to event handlers on elements in the same order the buble phase would normally callback.
There is a special controller for document/window/body events.