Download Ajax for Web Application Developers by Kris Hadlock PDF

By Kris Hadlock

Reusable elements and styles for Ajax-driven applicationsAjax is without doubt one of the most up-to-date and maximum how you can increase clients' on-line event and create new and cutting edge net performance. via permitting particular components of an internet web page to be displayed with no fresh the total web page, Ajax considerably complements the event of net purposes. It additionally we could internet builders create intuitive and cutting edge interplay processes.Ajax for net program builders offers the in-depth operating wisdom of Ajax that net builders have to take their internet purposes to the subsequent point. The ebook indicates find out how to create an Ajax-driven net software from an object-oriented standpoint, and it contains dialogue of a number of priceless Ajax layout patterns.This distinctive consultant covers the production of connections to a MySQL database with personal home page five through a customized Ajax engine and exhibits the best way to gracefully layout the reaction with CSS, JavaScript, and XHTML whereas protecting the knowledge tightly safe. It additionally covers using 4 customized Ajax-enabled parts in an program and the way to create every one of them from scratch.The ultimate portion of the e-book combines the person code examples and strategies from prior chapters of the e-book into one higher, Ajax-driven applicationan inner net mail program that may be utilized in any user-based program, corresponding to a community-based net software. Readers will study not just the best way to create and use their very own reusable Ajax elements during this software but in addition the way to attach their elements to any destiny Ajax purposes that they may construct.

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If you are making numerous requests in a large application, this will render your application unusable. The last method, the send method, will be used to actually send the HTTP request to the server and wait to receive the response. This method takes the same URL as the open method, plus any key/value pairs that may exist in a query string. After this method instantiates the XHR object and makes the request based on the information that we provide it, a response will be received in the callback method that we set.

For example, we may set a default value for the email address. com"; var jd = new employee(002, "John", "Doe"); Overriding a property value simply changes the value for the instance that you are setting it with. So, now the kh employee has a new email address, but the jd employee has the email address that was set with the prototype. Overwriting an object property is completely different. If we were to change the email address for the kh employee after we had already set it, we would be overwriting the original value.

Now that we have a custom object to control and manage all of our Ajax requests, we can add one more Part II: Creating and Using the JavaScript Engine 51 52 Part II: Creating and Using the JavaScript Engine layer of abstraction to the code to make our requests more manageable and secure. Creating an Ajax Updater In order to keep our Ajax object in the background and add a layer of abstraction to our engine, we will create an object called AjaxUpdater. This object is another that follows the Singleton pattern to keep it accessible from all scopes of the application for easy XHR management and control.

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