AJAX and PHP: Building Responsive Web Applications by Cristian Darie

By Cristian Darie

AJAX and personal home page: development Responsive net functions is the main sensible and effective source a reader can get to go into the interesting international of AJAX. This ebook will educate you the way to create speedier, lighter, higher net purposes by utilizing the AJAX materials applied sciences to their complete capability. This booklet is for internet builders keen to construct higher internet purposes. A simple wisdom of personal home page, XML, JavaScript and MySQL, or a robust will to learn-as-you-type, is thought.

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Take the following HTML file for example, which executes some simple JavaScript code when loaded. Notice the document object, which is a default object in JavaScript that interacts with the DOM of the HTML page. write commands generate output that is added to the element of the page when the script executes. The content that you generate becomes part of the HTML code of the page, so you can add HTML tags in there if you want. We advise you try to write well-formed and valid HTML code when possible.

Once again, we're not using this technique because it would simply add more lines of code without bringing any benefits; but the ideas are good to keep nevertheless. If you decide to use object detection, please be sure to check for XMLHttpRequest first before checking for ActiveX support. The reason for this recommendation is Internet Explorer 7, which supports both ActiveX and XMLHttpRequest; the latter is better because it gives you the latest object version. With ActiveX, as you will see, you need to write quite a bit of code to ensure that you get a recent version, although you still are not guaranteed to get the latest one.

One of the problems of the presented code is that you have no control in the JavaScript code over where the output should be displayed. As it is, the JavaScript output appears first, and the contents of the element come next. Needless to say, this scenario isn't relevant even to the simplest of applications. Except for the most simple of cases, having just JavaScript code that executes unconditionally when the HTML page loads is not enough. You will usually want to have more control over when and how portions of JavaScript code execute, and the most typical scenario is when you use JavaScript functions, and execute these functions when certain events (such as clicking a button) on the HTML page are triggered.

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