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Download PDF by Cristian Darie: AJAX and PHP: Building Responsive Web Applications

By Cristian Darie

ISBN-10: 1904811825

ISBN-13: 9781904811824

Assuming a simple wisdom of Hypertext Preprocessor, XML, JavaScript and MySQL, this ebook might help you know how the center of AJAX beats and the way the constituent applied sciences interact. AJAX and Hypertext Preprocessor: development Responsive net functions is principally a publication for newcomers, but if designing its contents we attempted to discover the suitable combination of themes that might aid either beginner and skilled net builders make a major leap forward. the speculation at the back of the entire applied sciences used is particularly in actual fact defined, with out dull you with information about visible issues. correct from the 1st bankruptcy you begin studying by means of examples. The examples will be simply tailored to many internet tasks and so they conceal stuff that's either beneficial and enjoyable.

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Additional resources for AJAX and PHP: Building Responsive Web Applications

Example text

JavaScript Events and the DOM In the next exercise, we will create an HTML structure from JavaScript code. When preparing to build a web page that has dynamically generated parts, you first need to create its template (which contains the static parts), and use placeholders for the dynamic parts. The placeholders must be uniquely identifiable HTML elements (elements with the ID attribute set). So far we have used the

element as placeholder, but you will meet more examples over the course of this book.

Using the try/catch syntax, you can catch the exception and handle it locally, so that the error won't be propagated to the user's browser. 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.

Info Client-Side Techniques with Smarter JavaScript The third parameter of open, called async, specifies whether the request should be handled asynchronously; true means that script processing carries on after the send() method returns without waiting for a response; false means that the script waits for a response before continuing processing, freezing the web page functionality. To enable asynchronous processing, you will seed to set async to true, and handle the onreadystatechange event to process the response from the server.

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AJAX and PHP: Building Responsive Web Applications by Cristian Darie


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