AJAX and PHP: Building Responsive Web Applications by Cristian Darie

By Cristian Darie

Assuming a easy wisdom of Hypertext Preprocessor, XML, JavaScript and MySQL, this booklet may also help you know how the center of AJAX beats and the way the constituent applied sciences interact. AJAX and personal home page: construction Responsive net functions is especially a ebook for rookies, but if designing its contents we attempted to discover the right combination of subject matters that might aid either beginner and skilled net builders make a massive breakthrough. the speculation at the back of the entire applied sciences used is particularly essentially defined, with out dull you with information about visible issues. correct from the 1st bankruptcy you begin studying via examples. The examples may be simply tailored to many internet tasks and so they hide stuff that's either beneficial and enjoyable.

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Info Client-Side Techniques with Smarter JavaScript The try/catch syntax is as follows: try { // code that might generate an exception } catch (e) { // code that is executed only if an exception was thrown by the try block // (exception details are available through the e parameter) } You place any code that might generate errors inside the try block. If an error happens, the execution is passed immediately to the catch block. If no error happens inside the try block, then the code in the catch block never executes.

We've kept this first example simple on purpose, to make things easier to understand. What's special about this application is that the displayed message comes automatically from the server, without interrupting the user's actions. (The messages are displayed as the user types a name). The page doesn't get reloaded to display the new data, even though a server call needs to be made to get that data. This wasn't a simple task to accomplish using non-AJAX web development techniques. The application consists of the following three files: 1.

When the request is made asynchronously, before calling send you will also need to set the onreadystatechange property with the callback method to be executed when the status of the request changes, thus enabling the AJAX mechanism. The open method is used for initializing a request. It has two required parameters and a few optional ones. The open method doesn't initiate a connection to the server; it is only used to set the connection options. The first parameter specifies the method used to send data to the server page, and it can have a value of GET, POST, or PUT.

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