AJAX and PHP: Building Responsive Web Applications by Cristian Darie

By Cristian Darie

Assuming a uncomplicated wisdom of Hypertext Preprocessor, XML, JavaScript and MySQL, this e-book can assist you know how the guts of AJAX beats and the way the constituent applied sciences interact. AJAX and Hypertext Preprocessor: development Responsive internet functions is especially a booklet for newcomers, but if designing its contents we attempted to discover the suitable combination of themes that might aid either amateur and skilled net builders make a tremendous leap forward. the idea at the back of the entire applied sciences used is particularly truly defined, with no dull you with information about seen issues. correct from the 1st bankruptcy you begin studying via examples. The examples should be simply tailored to many internet initiatives and so they conceal stuff that's either necessary and enjoyable.

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Extra resources for AJAX and PHP: Building Responsive Web Applications

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JavaScript has a similar syntax to the good old C language. JavaScript is a parsed language (not compiled), and it has some Object-Oriented Programming (OOP) capabilities. JavaScript wasn't meant for building large powerful applications, but for writing simple scripts to implement (or complement) a web application's client-side functionality (however, new trends are tending to transform JavaScript into an enterprise-class language—it remains to be seen how far this will go). JavaScript is fully supported by the vast majority of web browsers.

The try/catch construct, initially implemented with OOP languages, offers a powerful exception-handling technique in JavaScript. Basically, when an error happens in JavaScript code, an exception is thrown. The exception has the form of an object that contains the error's (exception's) details. 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.

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. 7 for a visual representation): 1. 2. 3. 4. 5. 6. 7). 7). php asynchronously. The text entered by the user is passed on the call as a query string parameter (it is passed via GET). The handeServerResponse function is designed to handle request state changes. php executes on the server.

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