Ajax Basics

SUNIL16 · March 15, 2010

Hi Friends,

why i am not able fetch message in data.txt file

<html>
<head><title>Ajax Demo</title>
<script language="javascript">
var XMLHttpRequestObject = false;

if(window.XMLHttpRequest)
{
XMLHttpRequestObject = new XMLHttpRequest();
}
else if(window.ActiveXObject)
{
XMLHttpRequestObject = new ActiveXObject("Microsoft", "XMLHTTP");
}

function get_data(sourcedata, DivId)
{
if(XMLHttpRequestObject)
{
var obj=document.getElementById(DivId);
XMLHttpRequestObject.open("GET", sourcedata);

XMLHttpRequestObject.OnreadyStateChange=function()
{
if(XMLHttpRequestObject.readystate == 4 && XMLHttpRequestObject.status ==200)
{
obj.innerHTML=XMLHttpRequestObject.ResponseText;
}

}

XMLHttpRequestObject.Send(null);
}
}


</script>

</head><body>
<h1> Ajax demo</h1>
<form>
<input type="button" value="fetch message" OnClick="get_data('data.txt','targetdiv')">
</form>
<div id="targetdiv">
<p>fetched message will apear here</p>
</div>
</body></html>

Where i went wrong?

SUNIL16 · March 15, 2010

Its working in IE wen made XMLHttpRequestObject = new ActiveXObject("Microsoft", "XMLHTTP");

to XMLHttpRequestObject = new ActiveXObject("Microsoft.XMLHTTP");

Its not working in Morzilla, chrome y?

ScotDiddle · March 16, 2010

SUNIL16,

Here is a different ajax script, and a different paradigm that works :


<?php


Header("Cache-control: private, no-cache");
Header("Expires: Mon, 7 Oct 2002 05:00:00 GMT");
Header("Pragma: no-cache");

?>


<html>

<head>

<title>Ajax Demo</title>

<script>

/***********************************************
* Dynamic Ajax Content- © Dynamic Drive DHTML code library (www.dynamicdrive.com)
* This notice MUST stay intact for legal use
* Visit Dynamic Drive at http://www.dynamicdrive.com/ for full source code
***********************************************/

var bustcachevar=1 //bust potential caching of external pages after initial request? (1=yes, 0=no)
var loadedobjects="";
var rootdomain="http://"+window.location.hostname;
var bustcacheparameter="";

function get_data (url, containerid) {

	var page_request = false;

	if (window.XMLHttpRequest) { // if Mozilla, Safari etc
		page_request = new XMLHttpRequest();
		alert('Firefox');
	}
	else if (window.ActiveXObject) { // if IE

		try {
			page_request = new ActiveXObject("Msxml2.XMLHTTP");
			alert('xml2');
		}
		catch (e) {

			try {
				page_request = new ActiveXObject("Microsoft.XMLHTTP");
				alert('m$');
			}
			catch (e){}
		}
	}
	else {
		return false;
	}

	page_request.onreadystatechange=function() {

		// alert(page_request);
		// alert(containerid);

		loadpage(page_request, containerid);
	}

	if (bustcachevar) { //if bust caching of external page
		bustcacheparameter=(url.indexOf("?")!=-1)? "&"+new Date().getTime() : "?"+new Date().getTime();
	}

	page_request.open('GET', url+bustcacheparameter, true);
	page_request.send(null);

} // END function ajaxpage(url, containerid)

function loadpage(page_request, containerid) {

	// alert(page_request);
	// alert(containerid);

	if (page_request.readyState == 4 && (page_request.status==200 || window.location.href.indexOf("http")==-1)) {
		document.getElementById(containerid).innerHTML=page_request.responseText;
	}

} // END function loadpage(page_request, containerid) {

function loadobjs() {

	if (!document.getElementById) {
		return;
	}

	for (i=0; i<arguments.length; i++) {

		var file=arguments[i];

		var fileref="";

		if (loadedobjects.indexOf(file)==-1) { //Check to see if this object has not already been added to page before proceeding

			if (file.indexOf(".js")!=-1) { //If object is a js file

				fileref=document.createElement('script');
				fileref.setAttribute("type","text/javascript");
				fileref.setAttribute("src", file);
			}
			else if (file.indexOf(".css")!=-1) { //If object is a css file

				fileref=document.createElement("link")
				fileref.setAttribute("rel", "stylesheet");
				fileref.setAttribute("type", "text/css");
				fileref.setAttribute("href", file);
			}

		} // END if (loadedobjects.indexOf(file)==-1) {

		if (fileref!="") {
			document.getElementsByTagName("head").item(0).appendChild(fileref)
			loadedobjects+=file+" " //Remember this object as being already added to page
		}

	} // for (i=0; i<arguments.length; i++) {

} // END function loadobjs() {

</script>

</head>

<body>

<h1> Ajax demo</h1>
<form>
<input type="button" value="fetch message" onClick="get_data('showData.php','targetdiv');">
</form>
<div id="targetdiv">
<p>fetched message will apear here</p>
</div>

</body>
</html>

where:

showData.php looks like this:


<?php


Header("Cache-control: private, no-cache");
Header("Expires: Mon, 7 Oct 2002 05:00:00 GMT");
Header("Pragma: no-cache");

?>

<!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" xml:lang="en" lang="en">

<head>
  <title></title>
</head>

<body>

<?php

$myData = file_get_contents('data.txt');

echo $myData;

?>

</body>

</html>

Worked for me in both IE and FF.

Scot L. Diddle, Richmond VA

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