Download Ajax in Practice by Dave Crane PDF

By Dave Crane

Ajax in perform presents example-rich insurance of Ajax choked with ready-to-use code and functional recipes for universal and not-so-common projects. Ajax builders now face the flow from Ajax-as-theory to Ajax-in-practice. Ajax in perform publications net builders during the transition from studying approximately Ajax to effectively employing Ajax-driven suggestions in real-world improvement situations. Ajax supplies net builders the aptitude to create wealthy user-centered net purposes. yet Ajax additionally provides a brand new point of complexity and class to these functions. Ajax in perform tackles Ajax head-on, supplying numerous hands-on options and lots of reusable code to handle the categorical concerns builders face while development Ajax-driven recommendations. After a short evaluation of Ajax, this booklet takes the reader via dozens of operating examples, all offered in an easy-to-use cookbook structure. Readers will easy methods to enforce drag-and-drop interfaces and may become aware of the best way to create potent nagigation recommendations for his or her purposes. in contrast to a standard cookbook, even though, Ajax in perform presents an intensive dialogue of every method offered and indicates how the person parts will be attached to create strong ideas. A enjoyable "mash-up" bankruptcy concludes the e-book. all through Ajax in perform, the examples selected are attention-grabbing, enjoyable, and sensible.

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This workflow follows a work-wait pattern. That is, at any point in time, the browser-side application is either presenting information to the user or waiting for the server to return a response. 1 Work-wait pattern of user interaction in a classic web application 6 CHAPTER 1 Embracing Ajax is very punctuated. During the wait periods, the user is unable to interact with the web app, beyond possibly being able to read some of the content on the page that is just about to be replaced by the server response.

Before we start examining how the XHR object does this, let’s look at the basic information needed to set up a call to the server. We will need ■ The URL of the server resource ■ The HTTP Request type, usually a GET or a POST ■ Parameters needed by the server resource ■ A JavaScript function to interpret the results returned from the server OK, let’s start checking these items off the list. The first two items, and possibly the third, are passed when calling the open() method. open() initializes a connection to a URL.

4 as we work through the steps. The first thing that we need to do is to get ahold of an XHR object. 2 Instantiating XMLHttpRequest The XHR object is built into the four major modern browser families: Internet Explorer, Firefox/Mozilla/Netscape, Safari, and Opera. To use the object, you’ll create an instance of the XHR object, give it some parameters to set up the request you want to send, tell it to send the request, and then process the result. 1 shows a cross-browser example of the first step, namely, instantiating the XHR object.

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