By Shelley Powers
Including Ajax is perfect for the intermediate to complex net builders between you who're fearful and stressed approximately Ajax, considering that it'll strength you to begin over along with your craft. This clean advisor will calm these fears by way of delivering a wholly new method of the subject. instead of introduce Ajax as a very new means of doing issues, this booklet exhibits you the way to combine Ajax with present websites, and does so by way of construction to Ajax instead of construction from an Ajax beginning. by means of analyzing this publication, you are going to find out how Ajax permits you to create "rich" internet functions, yet extra importantly, you will see how the practices you persist with feed correct into Ajax - and that, as a rule, 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 discover ways to combine Ajax together with your ordinary procedure. on the finish of including Ajax, there is mirrored image on no matter if beginning over should be a enjoyable thought, yet by means of you then might be even more happy with it.
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Extra resources for Adding Ajax
In the early days of the browser, one of the first items people wanted to control was the font. If the entire page were black and white, with font family and size based only on the type of element, our sites would have been too uniform and far too dull (though it would have been easy from a designer’s perspective, not to mention fully accessible). To provide for page customization, a few new HTML elements were introduced as the language developed, including one of the most notorious of all bad elements: blink.
If you’re changing a static web page form to one that uses script and XMLHttpRequest to support in-page edits, your use of the new technologies is relatively isolated and will have little impact on the overall site application. However, if you’re adding a site-wide help system, a new dynamic menu, or an inplace search feature, all of your pages will be impacted, and you might want to consider some additional architecture changes, such as splitting out your header and all the script into separate files that can be included in all of your pages.
SetRequestHeader The syntax is setRequestHeader(label,value). This method adds a label/value pair to the header in the request. send The syntax is send(content). This method is used to send the request with any associated data. If the request is made using an HTTP method such as POST, where parameters aren’t attached to the URL, all required parameters are passed using this method; otherwise, the content is set to null. 36 | Chapter 2: The Ajax Bits getAllResponseHeaders The syntax is getAllResponseHeaders( ).