Download Ajax in Practice by Dave Crane PDF

By Dave Crane

ISBN-10: 1932394990

ISBN-13: 9781932394993

Ajax in perform presents example-rich insurance of Ajax jam-packed with ready-to-use code and functional recipes for universal and not-so-common initiatives. Ajax builders now face the stream from Ajax-as-theory to Ajax-in-practice. Ajax in perform courses internet builders during the transition from studying approximately Ajax to effectively utilizing Ajax-driven concepts in real-world improvement eventualities. Ajax supplies internet builders the capability to create wealthy user-centered web functions. yet Ajax additionally provides a brand new point of complexity and class to these purposes. Ajax in perform tackles Ajax head-on, offering numerous hands-on innovations and a whole lot reusable code to deal with the categorical concerns builders face whilst construction Ajax-driven recommendations. After a quick evaluation of Ajax, this booklet takes the reader via dozens of operating examples, all provided in an easy-to-use cookbook layout. Readers will the right way to enforce drag-and-drop interfaces and may notice the way to create powerful nagigation ideas for his or her functions. not like a standard cookbook, notwithstanding, Ajax in perform offers a radical dialogue of every approach provided and exhibits how the person elements might be hooked up to create robust strategies. A enjoyable "mash-up" bankruptcy concludes the e-book. all through Ajax in perform, the examples selected are attention-grabbing, exciting, and useful.

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Sample text

Discussion We’ve demonstrated in this example that parsing JSON on the client is extremely easy, and that alone makes it a compelling possibility. 4, you can see that we’ve only covered one of the four stops in the full round-trip between client and server: the conversion of JSON to client-side objects. For a small app like this one, what we’ve done so far is good enough, but in larger apps, or those handling more complex data, we would want to automatically handle all aspects of serialization and deserialization, and be free to concentrate on business logic on the server and rendering code on the client.

4 shows the JSP used to serve data to version 4 of our app. length() > 8); %> updateName("<%= name %>",<%= isLong %>); The JSP is simpler in terms of length of code, but also in the number of concepts. It is only concerned with the business logic appropriate to the server and talks to the client via a high-level API. Discussion With this example, we’ve crossed an important threshold and need to update multiple regions of the UI from a single Ajax call. At this point, the simple innerHTML approach that we used in example 2 can no longer suffice.

As we noted at the beginning of this chapter, we have a great deal of freedom as to what form this data can take. There are two strong contenders at the moment: JavaScript Object Notation (JSON) and XML. We’ll begin to explore data-centric Ajax in this section with a look at JSON. A one-minute JSON primer Before we dive into any examples, let’s quickly introduce JSON. JSON is a lightweight data-interchange format that can be easily generated and parsed in many different server-side technologies and in JavaScript.

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