Adding Ajax by Shelley Powers

By Shelley Powers

Including Ajax is perfect for the intermediate to complex internet builders between you who're anxious and burdened approximately Ajax, considering that it'll strength you to begin over along with your craft. This fresh consultant will calm these fears via delivering a completely new method of the subject. instead of introduce Ajax as a totally new approach of doing issues, this publication indicates you the way to combine Ajax with current websites, and does so via development to Ajax instead of development from an Ajax starting place. by means of analyzing this e-book, you are going to learn the way Ajax enables you to create "rich" net purposes, yet extra importantly, you will see how the practices you persist with feed correct into Ajax - and that, commonly, you already paintings with the applied sciences concerned. including bits and items usually makes even more experience than tearing down and rebuilding, and you can learn how to combine Ajax together with your traditional strategy. on the finish of including Ajax, there is mirrored image on no matter if beginning over could be a enjoyable suggestion, yet by means of you then might be even more happy with it.

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Google once came up with beta functionality, the Google Web Accelerator, which promised more efficient applications by automatically prefetching all GETs within a page and caching the data. Unfortunately, some of the GETs on pages that users visited were actually used to delete or update data. Accessing a page with a browser equipped with this Google functionality created all sorts of havoc. Though Google’s use of GET was hasty at best, the lesson learned was valuable: GET should be used to retrieve data only; POST, PUT, and DELETE are used to create, update, and delete data: • GET retrieves data.

Since older Windows operating systems, such as the very popular Windows 2000, cannot support the newer IE 7, you have to decide whether you will provide support for people using Windows 2000 (or those using Windows XP who have not upgraded their browsers). x. x, you’re most likely going to want to support this older browser. Fortunately, the additional code doesn’t take a lot of extra space. The next issue when working with the ActiveX object is determining which object ID to set in the function call to create the object.

This method aborts the current request. XMLHttpRequest also has the following properties: onreadystatechange This property holds a handle to the function that will be called when the ready state of the request changes. readyState This property has one of five values: 0 for uninitialized, 1 for an open request, 2 for a request that has been sent, 3 when a response is being received, and 4 when the response is finished loading. For the most part, we’re interested in a readyState of 4. responseText This property specifies that the response will be formatted as a text string.

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