By Dave Crane

Ajax in perform presents example-rich insurance of Ajax filled with ready-to-use code and functional recipes for universal and not-so-common projects. Ajax builders now face the movement from Ajax-as-theory to Ajax-in-practice. Ajax in perform courses net builders throughout the transition from studying approximately Ajax to effectively employing Ajax-driven concepts in real-world improvement eventualities. Ajax offers internet builders the capability to create wealthy user-centered web 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 suggestions and a whole lot reusable code to handle the categorical matters builders face whilst construction Ajax-driven strategies. After a short assessment of Ajax, this ebook takes the reader via dozens of operating examples, all offered in an easy-to-use cookbook layout. Readers will how one can enforce drag-and-drop interfaces and should realize tips to create potent nagigation ideas for his or her purposes. in contrast to a conventional cookbook, although, Ajax in perform offers a radical dialogue of every procedure provided and indicates how the person parts may be hooked up to create robust options. A enjoyable "mash-up" bankruptcy concludes the ebook. all through Ajax in perform, the examples selected are attention-grabbing, pleasing, and sensible.

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Example text

4. Half of JSON is provided for free as part of the JavaScript language specification, and the other half is available as a third-party library. That sounds like an unusual state of affairs, so let’s explain what we mean by it. First, let’s look at what a JSON definition looks like. The following example defines a variable customers and stores in it an array attribute called details. Each array element is a collection of attributes of each customer object. Each customer object has three attributes: num, name, and city.

5. getParameter("name"); %>

Hello <%=name%>

I used to know someone called <%=name%>.

We’ve set the MIME type of the response to text/html, out of politeness. This isn’t strictly necessary but provides a statement of intent. Some Ajax libraries will pay attention to the MIME type of responses, as you’ll see, so it’s a good habit to get into. The body of the response generates a small bit of content from the input parameters. In this case, we’re not doing anything other than parroting back the name supplied by the user, but that’s just to keep the back end simple for our example.

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.

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