Beginning Ajax by Chris Ullman

By Chris Ullman

Utilizing confirmed examples and explaining options step-by-step, this publication indicates you ways development Ajax-enabled websites and functions permits extra interactive consumer interfaces than ever sooner than. you are going to know about the variations in features among client-side and server-side improvement options, in addition to how Ajax crosses this boundary. you are going to additionally realize how Ajax innovations should be summed up via styles (which are improvement versions that you're going to use repeatedly). With a mastery of those innovations, one could breathe new lifestyles into your websites.

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Sample text

For example, some aspects of page validation can be performed equally as well on the browser. If you were to type “fake e-mail” into an e-mail textbox, you wouldn’t need to go to the server to check this. JavaScript can perform a check for you equally as efficiently, and also much more quickly. While plenty of people sensibly do validation on both client and server, many pages attempt to perform the processing only on the server. If there has been one continual bugbear about the Web, it is that it is slow.

The XMLHttpRequest Object If there’s one thing you haven’t come across before, it’s likely to be the XMLHttpRequestObject. Microsoft introduced quite an obscure little ActiveX control in Internet Explorer version 5 (IE 5) called the XMLHttp object. Of course, ActiveX controls are tied to IE, so shortly afterward, Mozilla engineers followed suit and created their own version for Mozilla 1 and Netscape 7, the corresponding XMLHttpRequest object. The status of these objects was elevated considerably because of their inclusion in the original Ajax article.

GetElementById(“myTextbox”); You can then assign values to the variable you have created to alter the values. visibility = “visible”; Another related method is the getElementsByTagName method. The getElementsByTagName method will return an array of elements on the web page of type NodeList, all with a given tag name, even if there is only one occurrence of that element on the page. getElementsByTagName(“img”); It is also possible to assemble the page by adding new sections to the document known as nodes.

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