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

By Bogdan Brinzarea-Iamandi; Audra Hendix; Cristian Darie

ISBN-10: 1847197728

ISBN-13: 9781847197726

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6. The user display is updated with the new message from the server, but the user can continue typing without any interruptions. After a delay of one second, the process is restarted from step 2. [ 33 ] The World of AJAX and PHP Summary This chapter was all about a quick introduction to the world of AJAX. In order to proceed with learning how to build AJAX applications, it's important to understand why and where they are useful. As with any other technology, AJAX isn't the answer to all problems, but it offers powerful means to address some of them.

GetAllResponseHeaders() Returns the response headers as a string. getResponseHeader("headerLabel") Returns a single response header as a string. open("method", "URL"[, asyncFlag[, "userName"[, "password"]]]) Initializes the request parameters. send(content) Performs the HTTP request. setRequestHeader("label", "value") Sets a label/value pair to the request header. onreadystatechange Used to set the callback function that handles request state changes. [ 60 ] Chapter 2 Method/Property readyState Description Returns the status of the request: 0 = uninitialized 1 = loading 2 = loaded 3 = interactive 4 = complete responseText Returns the server response as a string.

Finally, after everything is set up, you simply call send() to execute the request. send(null); [ 61 ] JavaScript and the AJAX Client If you need to send parameters to the server-side script you're calling, you can use either GET or POST. param1=x¶m2=y. This server request passes two parameters—param1 with the value x, and param2 with the value y. send("param1=x¶m2=y"); The two methods should produce the same results. In practice, there are a few differences between POST and GET that you should know about: • • • Using GET can help with debugging because you can simulate GET requests with a web browser, so you can easily see what your server script generates.

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

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