AJAX and PHP : building modern web applications by Bogdan Brinzarea-Iamandi; Audra Hendix; Cristian Darie

By Bogdan Brinzarea-Iamandi; Audra Hendix; Cristian Darie

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Extra info for AJAX and PHP : building modern web applications

Example text

ReadyState is 4 will the server request be completed, allowing you to move forward to read the results (you'll learn about the other states in Chapter 2). You can also check that the HTTP transaction reported a status of 200, signaling that no problems happened during the HTTP request. When these conditions are met, you're free to read the server response and display the message to the user. [ 32 ] Chapter 1 After the response is received and used, the process is restarted using the setTimeout() function, which will cause the process() function to be executed after one second (note though that it's not necessary, or even AJAX specific, to have repetitive tasks in your client-side code): // restart sequence setTimeout('process()', 1000); Finally, let's reiterate what happens after the user loads the page (you can refer to the second screenshot under the Building a simple application with AJAX and PHP section for a visual representation): 1.

Needless to say, this is a bit disconcerting and rather awkward. Except for the most simple of cases, having just JavaScript code that executes unconditionally when the HTML page loads isn't going to work well for you. Usually you'll want to have more control over when, where, and how portions of JavaScript code execute. The most typical scenario uses JavaScript functions that execute in response to certain events being triggered (such as clicking on a button). JavaScript events and the DOM In the next exercise, we will create an HTML structure from JavaScript code.

The placeholders must be uniquely identifiable HTML elements (elements with the ID attribute set). [ 41 ] JavaScript and the AJAX Client Inserting dynamic data into an HTML page in an AJAX application is usually accomplished using an empty placeholder. The typical elements used as placeholders are

and , due to their generic usage purpose, but keep in mind that you're free to assign ids to all kinds of HTML elements. In practice,

and are typically used in conjunction with CSS to customize the appearance of the displayed content.

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