Adjust the ajaxpage function by including an additional parameter for a callback function and ensure to call your function within onreadystatechange. However, I strongly suggest utilizing jQuery instead.
UPDATE:
Here is the revised approach that I implemented: I introduced a new parameter named callback to your existing function ajaxpage. When the ajax event triggers onreadystatechange, if we receive a true value from loadpage, we execute the callback. To differentiate between different pages or content, I added the *page_request* and containerid arguments. You can now integrate this callback function with your ajaxpage function; in this instance, I utilized a function called myCallbackFunction.
I urge you to avoid this method as it may be considered outdated. There are more efficient ways and best practices available, especially if you are still in the learning phase.
<!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" lang="en" xml:lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Ajax Rotating Includes Script</title>
<script type="text/javascript">
/***********************************************
* 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 loadedobjects = ""
var rootdomain = "http://" + window.location.hostname
function ajaxpage(url, containerid, callback) {
var page_request = false
if (window.XMLHttpRequest) // if Mozilla, Safari etc
page_request = new XMLHttpRequest()
else if (window.ActiveXObject) { // if IE
try {
page_request = new ActiveXObject("Msxml2.XMLHTTP")
} catch (e) {
try {
page_request = new ActiveXObject("Microsoft.XMLHTTP")
} catch (e) {}
}
} else
return false
page_request.onreadystatechange = function () {
if (loadpage(page_request, containerid)) {
if (callback)
callback(page_request, containerid);
}
}
page_request.open('GET', url, true)
page_request.send(null)
}
function loadpage(page_request, containerid) {
if (page_request.readyState == 4 && (page_request.status == 200 || window.location.href.indexOf("http") == -1)) {
document.getElementById(containerid).innerHTML = page_request.responseText
return true;
}
return false;
}
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);
}
}
if (fileref != "") {
document.getElementsByTagName("head").item(0).appendChild(fileref)
loadedobjects += file + " " //Remember this object as being already added to page
}
}
}
function myCallbackFunction(page_request,containerid) {
// Perform necessary actions here
console.log("page_request", page_request);
console.log("container id", containerid);
}
</script>
<style type="text/css">
#leftcolumn{
float:left;
width:150px;
height: 400px;
border: 3px solid black;
padding: 5px;
padding-left: 8px;
}
#leftcolumn a{
padding: 3px 1px;
display: block;
width: 100%;
text-decoration: none;
font-weight: bold;
border-bottom: 1px solid gray;
}
#leftcolumn a:hover{
background-color: #FFFF80;
}
#rightcolumn{
float:left;
width:550px;
min-height: 400px;
border: 3px solid black;
margin-left: 10px;
padding: 5px;
padding-bottom: 8px;
}
* html #rightcolumn{ /*IE only style*/
height: 400px;
}
</style>
</head>
<body>
<div id="leftcolumn">
<a href="javascript:ajaxpage('ajaxfiles/external.htm', 'rightcolumn', myCallbackFunction);">Porsche Page</a>
<a href="javascript:ajaxpage('ajaxfiles/external2.htm', 'rightcolumn', myCallbackFunction);">Ferrari Page</a>
<a href="javascript:ajaxpage('ajaxfiles/external3.htm', 'rightcolumn',myCallbackFunction);">Aston Martin Page</a>
<div style="margin-top: 2em">Load CSS & JS files</div>
<a href="javascript:loadobjs('ajaxfiles/style.css', 'ajaxfiles/tooltip.js');">Load "style.css" and "tooltip.js"</a>
</div>
<div id="rightcolumn"><h3>Choose a page to load.</h3></div>
<div style="clear: left; margin-bottom: 1em"></div>
</body>
</html>