By Dave Crane
Ajax in perform presents example-rich insurance of Ajax jam-packed with ready-to-use code and functional recipes for universal and not-so-common projects. Ajax builders now face the circulation from Ajax-as-theory to Ajax-in-practice. Ajax in perform courses internet builders during the transition from studying approximately Ajax to effectively utilizing Ajax-driven innovations in real-world improvement situations. Ajax supplies internet builders the aptitude to create wealthy user-centered web purposes. yet Ajax additionally provides a brand new point of complexity and class to these purposes. Ajax in perform tackles Ajax head-on, delivering numerous hands-on innovations and lots of reusable code to handle the explicit matters builders face whilst construction Ajax-driven strategies. After a quick evaluate of Ajax, this publication takes the reader via dozens of operating examples, all awarded in an easy-to-use cookbook structure. Readers will how one can enforce drag-and-drop interfaces and may observe the best way to create potent nagigation recommendations for his or her functions. not like a conventional cookbook, even though, Ajax in perform presents an intensive dialogue of every approach provided and indicates how the person parts should be hooked up to create strong recommendations. A enjoyable "mash-up" bankruptcy concludes the e-book. all through Ajax in perform, the examples selected are attention-grabbing, unique, and useful.
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Additional resources for Ajax in Practice
The good news is that, having demonstrated these low-level details once, we aren’t going to return to them again in this book, as there are several good frameworks and libraries out there that will do the grunt work for us. However, knowing how XHR works is useful, because it will help us to understand what the Ajax libraries wrappers can and can’t do. To this end, we’ll present a few additional methods and properties of the XHR object before moving on to higher things. 5 Other XMLHttpRequest methods and properties There are other, lesser-used, XHR methods.
These can include HTTP verbs, headers, request bodies, a variety of callback options and other features. In this case, we only pass in two options. Request defaults to POST. Second, we provide a callback function. 3, we saw that the XHR object took a callback that was triggered whenever the readyState was changed. Request creates an XHR object internally, it defines an internal callback to handle these fine details. As an end user of the library, we can provide higher-level callbacks, such as onComplete, that fit better with our immediate requirements.
We’ll fix these up in the next example, but first let’s examine them. The first problem is that we’ve created a very tight coupling between the client and server code. The JSP needs to know the id attribute of the DOM element that it is going to populate. If we change the HTML on the user interface, we need to alter the server code. In a small example like this one, that’s not too great a burden, but it will quickly become unscalable. Second, we’ve created a solution looking for a problem. We aren’t doing anything here that we couldn’t do more elegantly and simply using innerHTML.