Read e-book online Ajax in Practice PDF

By Dave Crane

ISBN-10: 1932394990

ISBN-13: 9781932394993

Ajax in perform offers example-rich insurance of Ajax filled with ready-to-use code and useful recipes for universal and not-so-common projects. Ajax builders now face the stream from Ajax-as-theory to Ajax-in-practice. Ajax in perform courses net builders during the transition from studying approximately Ajax to effectively utilizing Ajax-driven concepts in real-world improvement situations. Ajax supplies internet builders the aptitude to create wealthy user-centered net purposes. yet Ajax additionally provides a brand new point of complexity and class to these purposes. Ajax in perform tackles Ajax head-on, supplying numerous hands-on innovations and hundreds reusable code to handle the explicit matters builders face while development Ajax-driven options. After a short evaluate of Ajax, this e-book takes the reader via dozens of operating examples, all provided in an easy-to-use cookbook structure. Readers will how one can enforce drag-and-drop interfaces and should observe the way to create potent nagigation techniques for his or her functions. in contrast to a conventional cookbook, even though, Ajax in perform offers a radical dialogue of every method awarded and indicates how the person elements may be attached to create robust strategies. A enjoyable "mash-up" bankruptcy concludes the ebook. all through Ajax in perform, the examples selected are fascinating, wonderful, and functional.

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Sample text

Request as an example of a well-designed wrapper object. Similar wrappers, with equally straightforward calling semantics, exist in other popular Ajax libraries. ajax() function, to name but three. Depending on the library that you plan to use, the exact capabilities of your Ajax wrapper will vary, but you’re likely to experience a satisfactory time savings from any of them. The callback function that we provided to handle the response was, in this case, very simple. In the next example, we’ll see what’s needed to allow for Ajaxbased generation of richer content.

We need to run the code when we receive it. Solution Using eval() is almost as simple as using innerHTML. 1 presents the third incarnation of our Hello World application. 1, you can see that we’ve had to change very little. We can still read the response body using the responseText property of the XHR object, which we then pass straight to eval() b. We want to modify the title block of the page when the response comes in. To do this, we need to perform a bit of DOM manipulation. 2. innerHTML = "

Hello, "+name+"

"; Generally, it is good manners to set the MIME type, but we’ve switched it off here because Prototype is clever enough to recognize the text/javascript MIME type and would evaluate it automatically for us.

Updater, but we didn’t want to use it here ourselves because it hides a lot of the underlying mechanics that we wished to explore, and it would focus the discussion too narrowly on a single library. 4 Summary We began this chapter with a brief discussion of where Ajax is now. The technology is maturing fast, and doing some interesting things. In terms of general trends, we noted two things. First, the discussion has moved on from how to make an Ajax request to what to do with this capability. Interesting issues are being raised in terms of web application architecture, and in terms of business models, and what new possibilities Ajax is enabling.

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Ajax in Practice by Dave Crane


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