While loading an iframe on page the most difficult thing is to set it’s height to the height of the content of the iframe. I looked around the web and got the code. This is pure Javascript, doesn’t contain jQuery or any other libraries. Set these functions :

function getDocHeight(doc) {
    doc = doc || document;
    var body = doc.body, html = doc.documentElement;
    var height = Math.max( body.scrollHeight, body.offsetHeight,
        html.clientHeight, html.scrollHeight, html.offsetHeight );
    return height;
}
function setIframeHeight(id) {
    var ifrm = id;
    var doc = ifrm.contentDocument? ifrm.contentDocument: ifrm.contentWindow.document;
    ifrm.style.visibility = ‘hidden’;
    ifrm.style.height = “10px”; // reset to minimal height in case going from longer to shorter doc
    // some IE versions need a bit added or scrollbar appears
    ifrm.style.height = getDocHeight( doc ) + 4 + “px”;
    ifrm.style.visibility = ‘visible’;
}

Now add an event listener to the iframe :

onload=’setIframeHeight(this)’

After adding the event listener, the iframe element will look like this :

<iframe onload=”setIframeHeight(this)” src=”subins.html”></iframe>

When the iframe completes loading the function will check it’s content height and set the height of the iframe to it’s content height. Pretty Neat, Huh ?