Read e-book online Ajax in Practice PDF

By Dave Crane

ISBN-10: 1932394990

ISBN-13: 9781932394993

Ajax in perform presents example-rich insurance of Ajax filled with ready-to-use code and sensible recipes for universal and not-so-common projects. Ajax builders now face the circulation from Ajax-as-theory to Ajax-in-practice. Ajax in perform publications internet builders throughout the transition from studying approximately Ajax to effectively using Ajax-driven strategies in real-world improvement situations. Ajax offers net builders the aptitude to create wealthy user-centered net functions. yet Ajax additionally provides a brand new point of complexity and class to these functions. Ajax in perform tackles Ajax head-on, delivering numerous hands-on options and lots of reusable code to deal with the categorical matters builders face while development Ajax-driven options. After a short assessment of Ajax, this booklet takes the reader via dozens of operating examples, all provided in an easy-to-use cookbook layout. Readers will methods to enforce drag-and-drop interfaces and should observe the right way to create potent nagigation options for his or her purposes. not like a conventional cookbook, notwithstanding, Ajax in perform offers a radical dialogue of every procedure offered and exhibits how the person elements should be hooked up to create strong ideas. A enjoyable "mash-up" bankruptcy concludes the publication. all through Ajax in perform, the examples selected are attention-grabbing, unique, and useful.

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We could write our own helper library to encapsulate the XHR object, or we could make use of a third-party library that has already done the grunt work for us. In this section, we’ll look at the Prototype library’s Ajax helper classes, and see how they can simplify Ajax for us. First, we’ll look at the business of making a request. 2, we faced a number of messy issues. First, we had to create an XHR object in a browser-independent fashion. Second, we had to invoke several methods on the XHR object to provide it with a URL, HTTP method, and POST body, and set other HTTP headers.

The response is provided in two properties: responseText and responseXML. responseText presents the response as a plain string. responseXML presents the response as a parsed XML document. We’ll look at both of these in more detail in the examples in this and the next chapter. We’ve now followed through the full lifecycle of a simple Ajax request and response. We’ve had to handle a lot of plumbing along the way, in getting ahold of the object, in assembling the request, and in parsing the response.

5 shows the application after receiving a response. In keeping with previous examples, the back end is going to be pretty dumb and will, in fact, return the same data (apart from the initial) for every name. It’s a simple step from dummy data to a real database, but we don’t want to confuse things by introducing too many Java-specific back-end features, as the client-side code can talk to any server-side technology. 5 37 JSON-powered Hello World application displaying rich data So, first we’re going to do things the simple way and just make use of JavaScript’s built-in JSON-parsing capabilities.

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Ajax in Practice by Dave Crane


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