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Ajax the combination of XHTML, CSS, DOM, XML, XSLT, XMLHttpRequest, and JavaScript
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Old November 21st, 2006, 09:06 AM
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Default onload function calll

Hello all,

I am having a Javascript function named "switchDiv(url, divID)", that uses the XMLHttpRequest object to open a file (url) and place the file contents in a DIV with id (divID). I am calling this function onload of the document,
its working fine if i call this function once.
But when i want to call this function twice with different url and divID its not working.
It works if i use:
 <body onload="switchDiv('hello.htm', 'helloDiv');">
Its not working if i use:
<body onload="switchDiv('hello.htm', 'helloDiv');switchDiv('goodbye.htm', 'goodbyeDiv');>

I am attaching the code for reference

Please help me out,

Thanks in advance,
Tanveer


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Hello, World!</title>
<script type="text/javascript">

var divSwap = createR();
var globalDIV;

switchDiv('hello.htm', 'helloDiv');
switchDiv('goodbye.htm', 'goodbyeDiv');

function createR() {
    var ro;
    var browser = navigator.appName;
    if(browser == "Microsoft Internet Explorer"){
        ro = new ActiveXObject("Microsoft.XMLHTTP");
    }else{
        ro = new XMLHttpRequest();
    }
    return ro;
}

function switchDiv(url, divID) {
    globalDIV = divID;
    //alert("Global div is " + globalDIV);
    divSwap.open('GET', url, true)
    divSwap.onreadystatechange = switchResponse;
    divSwap.send(null);
}

function switchResponse() {

    if(divSwap.readyState == 4){
        if (divSwap.status == 200) {
            doMagic();
        }
    }
}

function doMagic() {
    var myresponse = divSwap.responseText;
    document.getElementById(globalDIV).innerHTML=myres ponse;
}

</script>
</head>

<body onload="switchDiv('hello.htm', 'helloDiv');return; switchDiv('goodbye.htm', 'goodbyeDiv');">
<p><a href="javascript:switchDiv('hello.htm', 'helloDiv');">Hello</a> &nbsp; <a href="javascript:switchDiv('goodbye.htm', 'goodbyeDiv');">Goodbye</a></p>
<h1>DIV one</h1>
<div id="helloDiv"></div>
<h1>DIV two</h1>
<div id="goodbyeDiv"></div>
</body>
</html>

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Old November 21st, 2006, 01:15 PM
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Default

I imagine it's because the same variable is holding both instances of the XMLHttpRequest. You may need to create a new one for each call. You also seem to call switchDiv('hello.htm', 'helloDiv') twice as there's code in the script block as well as the onload handler. There is a return statement in the onload handler too, this means that the second call to switchDiv('goodbye.htm', 'goodbyeDiv') won't be processed.

--

Joe (Microsoft MVP - XML)
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