Ajax in Practice by Dave Crane

By Dave Crane

Ajax in perform offers example-rich insurance of Ajax filled with ready-to-use code and useful recipes for universal and not-so-common initiatives. Ajax builders now face the circulate from Ajax-as-theory to Ajax-in-practice. Ajax in perform publications internet builders in the course of the transition from studying approximately Ajax to effectively utilizing Ajax-driven suggestions in real-world improvement eventualities. Ajax supplies net builders the aptitude to create wealthy user-centered net purposes. yet Ajax additionally provides a brand new point of complexity and class to these functions. Ajax in perform tackles Ajax head-on, supplying numerous hands-on options and a whole lot reusable code to handle the explicit matters builders face whilst development Ajax-driven options. After a short evaluation of Ajax, this publication takes the reader via dozens of operating examples, all awarded in an easy-to-use cookbook structure. Readers will enforce drag-and-drop interfaces and should detect the best way to create powerful nagigation ideas for his or her functions. in contrast to a standard cookbook, although, Ajax in perform offers a radical dialogue of every procedure provided and indicates how the person elements might be hooked up to create robust options. A enjoyable "mash-up" bankruptcy concludes the publication. all through Ajax in perform, the examples selected are fascinating, exciting, and functional.

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The server generates a rich report from the application data, and sends it to the client for display. The client doesn’t need to know what the information means, but only how to display it. ) below the header. 8. 8 Result of returning rich HTML in the Ajax response Problem The server is sending us a rich visual report (rather than a simple piece of text) on the application state that is to be incorporated into our user interface. Solution The solution to this problem is quite straightforward, and requires little in the way of JavaScript coding.

We also need to check for older browsers that don’t support any kind of XHR object, and issue some sort of message to them, stating that the app won’t run on this browser. Depending on the browser in which the code is being run, we will follow one pathway or another through the if() statements, and, at the end of it, have a reference to an XHR object. It might be a native object or an ActiveX control, but as long as we have an XHR of some kind, we can start to use it. Fortunately, whatever kind of XHR we have, the methods and properties of the object are pretty much identical from here on.

Request class provided by Prototype allowed us to make our Ajax request with a minimum of fuss. All we had to provide was a URL, the HTTP method, and a callback function. Request worked out how to create the XHR object and filled in the blanks when shaping the request. It also simplified the callback semantics considerably, allowing us to supply a function that would only be called once on completion of the response, and that therefore only had to deal with application logic. Prototype provides a lot more than just the Ajax helper classes.

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