By Shelley Powers
Including Ajax is perfect for the intermediate to complex internet builders between you who're anxious and harassed approximately Ajax, considering that it'll strength you to begin over along with your craft. This clean consultant will calm these fears through supplying a wholly new method of the subject. instead of introduce Ajax as a totally new approach of doing issues, this booklet indicates you ways to combine Ajax with latest websites, and does so via development to Ajax instead of development from an Ajax origin. by means of studying this ebook, you'll find out how Ajax helps you to create "rich" net purposes, yet extra importantly, you will see how the practices you keep on with feed correct into Ajax - and that, regularly, you already paintings with the applied sciences concerned. including bits and items frequently makes even more experience than tearing down and rebuilding, and you may discover ways to combine Ajax together with your ordinary technique. on the finish of including Ajax, there is mirrored image on no matter if beginning over could be a enjoyable proposal, yet by way of you then can be even more happy with it.
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Additional resources for Adding Ajax
Even with concerns about “breaking” web behavior, of the two options just described, interceding in the form submission is the better option because it ensures that users can access any option in the selection list. However, we can’t just intercede in the form submission—we have to cancel the submission event and also ensure it doesn’t “bubble” up to the default form handling. , and returns false for IE. js with several functions to manage events. For now, IE must have different event handling incorporated, as it doesn’t support preventDefault.
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. 0. XMLHttp. Since most browsers that access the site will have access to the now-standard XMLHttpRequest object, it’s most efficient to test for its presence first. If this test fails, test for the two Microsoft-specific objects.
The rest of this chapter examines and demonstrates these properties and methods in detail, beginning with creating the XMLHttpRequest object. x. In IE 7, and in newer versions of the other browsers (Opera, Firefox, Safari, Netscape, and so on), the server request object is simply XMLHttpRequest, and the browsers all support similar behavior. x still supports the older Microsoft ActiveX object. 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).