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Using Ajax Frameworks
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libXmlRequesthtml at work
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<form> <input type = "button" value = "Get the message" onclick = "orgcotejsxmlgetXml('helloxml', callback, 1)"> </form> <div id="targetDiv"> <p>The fetched data will go here</p> </div> </body> </html>
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And that s it that completes our example that uses the libXmlRequest library You can see this web page at work in Figure 5-5, where it is correctly downloading the helloxml document Let s take a look at another Ajax framework now AJAXLib
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AJAXLib is a free Ajax framework that you can get at http://karaszewskicom/tools/ajaxlib/ The actual framework s JavaScript library is named ajaxlibjs This framework is simple to use You just pass this library s loadXMLDoc function the URL to your XML source, the callback function (to call with the downloaded XML), and a true/false parameter that lets you remove whitespace in the downloaded XML (if you pass a value of true, AJAXLib will remove indentation whitespace in your XML) After the XML is downloaded, it will be accessible to your JavaScript code in a JavaScript variable named resultXML
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Ajax: A Beginner s Guide
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Let s put this framework to work in an example named ajaxlibhtml, using AJAXLib to download and extract the text Hello from AJAXLib from a document named hello2xml:
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< xml version = "10" > <text> Hello from AJAXLib </text>
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The ajaxlibhtml web page begins with a button to download hello2xml, and indicates that the callback function is just named callback:
<form> <input type = "button" value = "Get the message" onclick = "loadXMLDoc('hello2xml', callback, false)"> </form>
In the callback function, we can make use of the JavaScript XML document object that will be stored in the resultXML variable to extract the text in hello2xml Here s what it looks like in ajaxlibhtml:
<html> <head> <title>Using the AJAXLib Ajax framework</title> <script src = "ajaxlibjs"></script> <script language = "javascript"> function callback() { var xmlData = resultXMLgetElementsByTagName("text"); var div = documentgetElementById('targetDiv'); divinnerHTML = xmlData[0]firstChilddata; } </script> </head> <body> <H1>Using the AJAXLib Ajax framework</H1> <form> <input type = "button" value = "Get the message" onclick = "loadXMLDoc('hello2xml', callback, false)"> </form>
5:
Using Ajax Frameworks
Figure 5-6
AJAXLibhtml at work
<div id="targetDiv"> <p>The fetched data will go here</p> </div> </body> </html>
And you can see the results in Figure 5-6 when the user clicks the button, the new message is indeed downloaded and displayed by AJAXLib Cool
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Handling XML in Ajax
Copyright 2009 by The McGraw-Hill Companies Click here for terms of use
Ajax: A Beginner s Guide
Key Skills & Concepts
Working with XML in JavaScript Navigating through XML documents Retrieving XML element data Retrieving XML element attribute data
he x in Ajax stands for XML, and this chapter is all about working with XML in Ajax applications The bulk of the material in this chapter has to do with using XML in JavaScript, because, as you ve already seen, doing so is not straightforward by any means But you re going to gain valuable experience in XML handling in JavaScript in this chapter We ll start with a discussion of how XML works (this book assumes you know HTML, but doesn t make the same assumption about XML)
Building Some XML
Writing your own XML is a lot like writing your own HTML you use tags, elements, and attributes, just as you do in HTML The crucial difference is that in XML, you make up your own element names For example, here s what an HTML document might look like, using the predefined element names in HTML 401:
<html> <head> <title>The Report</title> </head> <body> <h1>The Report</h1> All Quiet on the Western Front </body> <html>
This is fine as far as it goes, but what if you want to store your own private data For example, say that you want to create a document that lets you keep track of your friends There is no <friend> element in HTML, and no <first_name> or <last_name> element But you can make up and use those elements in XML no problem
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