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Improving Interaction with Ajax
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jax represents a fundamental shift in what the web is capable of, and is one of the defining characteristics of the Web 2.0 movement. First coined by Jesse James Garrett in his essay, Ajax: A New Approach to Web Applications (http://adaptivepath.com/ publications/essays/archives/000385.php), Ajax stands for Asynchronous JavaScript and XML. By enabling web applications to make requests to the server behind the scenes without refreshing the browser, Ajax can dramatically improve the responsiveness and usability of the user interface. It enables live searching, in-place editing, autocompletion, drag and drop re-ordering, and a host of interface techniques that were previously only available to desktop applications. While the acronym might be new, Ajax isn t exactly new. In fact, it s been around for several years. The problem was that it was prohibitively difficult to implement successfully. Times have changed, though, and with modern web frameworks like Rails, Ajax is accessible to the masses. In this chapter, we re going to focus on Ajax. We ll start by introducing the extensive support available for it in Rails, facilitated largely by two JavaScript libraries that come bundled with Rails: Prototype and script.aculo.us. With that out the way, we ll show you how to leverage these libraries to implement Ajax techniques in your applications. Finally, we ll look at how to use Ruby JavaScript (RJS) templates Rails own easy way to use JavaScript.
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Ajax is a combination of technologies centered around the XMLHttpRequest object, a JavaScript API originally developed by Microsoft, but now supported in all modern browsers. Of course, you could interface with the XMLHttpRequest API directly, but trust us, it wouldn t be fun. A far better idea is to use one of several libraries that abstract the low-level details and make cross-browser support possible. One of Rails s main features is the promise to make Ajax easier for web developers to use. To that end, it includes a comprehensive suite of helpers that will enable you to implement event the most advanced techniques with relative ease.
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CHAPTER 7 IMPROVING INTERACTION WITH AJAX
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The primary way by which Rails makes Ajax easier for developers is through the Prototype JavaScript library (http://prototypejs.org). While Prototype is a separate library, it s maintained and distributed as part of the Rails source code, and was copied to your Rails project when you ran the rails command. This amazingly well-thought-out library handles most of the work associated with creating the rich, highly interactive applications that characterize the Web 2.0. Even if JavaScript is not your main strength, you ll find that using Prototype makes working with it much easier. Prototype provides several utility methods that make working with JavaScript better. Perhaps the most important of these is $(), which is more or less a shortcut for the oft-cited document.getElementById() function used to access an element in the web page. Truth be told, $() is far more than a simple wrapper document.getElementById. The real magic stems from the fact that any elements accessed using it are automatically extended by Prototype. The biggest part of the Prototype framework is its Document Object Model (DOM) extensions. These DOM extensions allow you to write things like: $('contact'). removeClassName('active').hide(); to get the element with the ID contact , remove the active class name, and hide it from view. The contact element wouldn t have had these methods natively. Because it was fetched using $(), Prototype automatically added them. Table 7-1 lists some of the most commonly used Prototype utility methods. For a complete list, see http://prototypejs.org/api/utility.
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Table 7-1. Prototype Utility Functions Function
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Returns the element in the document matching the given ID. For example, $('contact_form'); will return the element with ID contact_form. Returns the value of the given form element (such as a text field or selection list) identified by the given ID. For example, $F('email_address'); will return the value of the field with ID email_address.
$F()
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