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Using Ajax Frameworks
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Note that we re calling the postDataDownloadXml function to download the color schemes in XML both schemes come from the colorsphp script, but for scheme 1, we post a value of 1, and for scheme 2, we post a value of 2 Here s what the whole postDataDownloadXmlhtml looks like:
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<html> <head> <title>Posting Data and Downloading Text With the Ajax Framework Library Pack</title> <script type = "text/javascript" src = "ajaxframeworkjs"></script> <script language = "javascript"> function callback(xmlDocument) { var obj = documentgetElementById('targetDiv'); colors = xmlDocumentgetElementsByTagName("color"); objinnerHTML = "Here are the fetched colors:<ul>"; for (loopIndex = 0; loopIndex < colorslength; loopIndex++ ) { objinnerHTML += "<li>" + colors[loopIndex]firstChilddata + "</li>"; } objinnerHTML += "</ul>"; } </script> </head> <body> <h1>Posting Data and Downloading Text With the Ajax Framework Library Pack</h1> <form> <input type onclick = <input type onclick = </form>
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= "button" value = "Get color scheme 1" "postDataDownloadXml('colorsphp', 'data=1', callback)"> = "button" value = "Get color scheme 2" "postDataDownloadXml('colorsphp', 'data=2', callback)">
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<div id="targetDiv">Your color scheme will appear here</div> </body> </html>
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You can see this HTML document, postDataDownloadXmlhtml, at work in Figure 5-4 just click a button and the application will use the postDataDownloadXml function to download the matching color scheme Nice And that completes the ajaxframeworkjs library, a convenient JavaScript library that includes these functions:
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downloadText(url, callbackFunction) downloadXml(url, callbackFunction) postDataDownloadText(url, dataToSend, callbackFunction) postDataDownloadXml(url, dataToSend, callbackFunction)
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Using ajaxframeworkjs means that you don t have to write your own Ajax code if you don t want to just include ajaxframeworkjs in your page and then call the appropriate function There are dozens of Ajax frameworks already out there, and we ll take a look at a couple of them next
Using the libXmlRequest JavaScript Ajax Framework
Among the many Ajax frameworks available is the libXmlRequest JavaScript Ajax framework, which you can pick up for free at wwwwhitefrostcom/reference/2008/04/27/libXmlRequest html The JavaScript library itself is libXmlRequestjs, and when you include that file in a <script> element, you make the functions available in libXmlRequest accessible to your code
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Using Ajax Frameworks
The libXmlRequest framework centers on two Ajax functions getXml and postXml Note that this library is XML based, and contains a number of functions that let you handle XML Here s an overview of the Ajax functions in the libXmlRequest library:
getXml(url) A synchronous GET request that returns null or an XML document object getXml(url, callback, 1) An asynchronous GET request that returns 1 if the request was made successfully, and calls the callback function handler when the XML is downloaded postXml(url, data) A synchronous POST request that returns null or an XML document object postXml(url, data, callback, 1) An asynchronous POST request that returns 1 if the request was made successfully, and calls the callback function handler when the XML is downloaded
The callback functions are called with two arguments, and the second argument is the one we re interested in, because it contains the downloaded XML in particular, the xdom property of that parameter is the XML object that contains the XML data we ve requested Let s use libXmlRequest to download and read the data in an XML document named hellp xml, which just holds the text Hello from libXmlRequest :
< xml version = "10" > <text> Hello from libXmlRequest </text>
We ll test libXmlRequest in an HTML document named libxmlrequesthtml First, we include libXmlRequestjs:
<html> <head> <title>Using the libXmlRequest Ajax framework</title> <script src = "libXmlRequestjs"></script> </html>
Then we add a button that calls the libXmlRequest function to get XML, orgcotejsxml getXml:
<html> <head> <title>Using the libXmlRequest Ajax framework</title>
Ajax: A Beginner s Guide
<script src = "libXmlRequestjs"></script> <body> <H1>Using the libXmlRequest Ajax framework</H1> <form> <input type = "button" value = "Get the message" onclick = "orgcotejsxmlgetXml('helloxml', callback, 1)"> </form> </body> </html>
This call to orgcotejsxmlgetXml gives the name of our callback function simply as callback, so we ll add that function now We just want to extract the text from the <text> element in the downloaded XML, and we can do that by extracting the <text> element with the getElementsByTagName method, using the firstChild property to extract the text node from the <text> element, and then using the data property of the text node to finally reach the text itself:
<html> <head> <title>Using the libXmlRequest Ajax framework</title> <script src = "libXmlRequestjs"></script> <script language = "javascript"> function callback(a, b) { var textElement = bxdomgetElementsByTagName("text"); var div = documentgetElementById('targetDiv'); divinnerHTML = textElement[0]firstChilddata; } </script> </head> <body> <H1>Using the libXmlRequest Ajax framework</H1>
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