javascript - How to auto shrink iframe height dynamically?

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javascript - How to auto shrink iframe height dynamically?

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

javascript - How to auto shrink iframe height dynamically?

I use the following code to achieve dynamic iframe height:

In the <head>:

<script language="javascript" type="text/javascript">
function resizeIframe(obj) {
obj.style.height = obj.contentWindow.document.body.scrollHeight + 'px';
}
</script>

In the <body>:

<iframe name="myiframe" src="somepage.html" width="100%" frameborder="0"
scrolling="no" onload='javascript:resizeIframe(this);' />
</iframe>

This codes works fine with height increasing only. So, when the content inside the iframe increases in height, the iframe updates its height and increases with it.

The problem is with height decreasing or shrinking. When the content inside the iframe decreases, it doesn't decrease and causing big unwanted white space. This only occurs in Chrome, IE & FF works fine.

Here is my Page

I want to know how to make this code works to auto shrink iframe height when it decreases?

Screenshot one:

Screenshot one

Screenshot two:

Screenshot two

Update 1

I placed the following code in the <head>

<script src="jquery-1.10.2.min.js"></script>
<script language="javascript" type="text/javascript">
$(function(){
var iframeDoc = $('iframe[name="dservers"]').contents().get(0);
$('iframe[name="dservers"]').load(function(){
    docHeight = $(iframeDoc).height();
    $('iframe[name="dservers"]').height( docHeight );
});
});

The iframe code in the <body>

<iframe name="dservers" src="dual_core.html" width="100%" frameborder="0"
scrolling="no" /></iframe>

The iframe not showing in the page. It appears for one second and then disappears.

Update 2

I think The problem was the $ character before (function(){, I removed it. I'm sorry I don't have much experience with jquery. I updated the page and removed the onload="resizeFrame()" but the iframe doesn't act dynamically now.

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1 Answer

深蓝 · Answer 1 · 2021-10-23T19:25:02+0000

Problem Solved

I was digging in the internet and I found a code solved the whole problem for me. I would like to share it so anyone can use it in order to get dynamic iframe height.

First, put the following code between the <head> tags:

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<script>
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(myiframeid) {
var ifrm = document.getElementById(myiframeid);
var doc = ifrm.contentDocument? ifrm.contentDocument: ifrm.contentWindow.document;
ifrm.style.visibility = 'hidden';
ifrm.style.height = "10px";
ifrm.style.height = getDocHeight( doc ) + 5+"px";
ifrm.style.visibility = 'visible';
}
</script>
<script>(function(run){
for (i=0;i<frames.length; i++) {
var f1 = document.getElementsByTagName('myiframename')[i];
if(!f1 && window.addEventListener && !run){
document.addEventListener('DOMContentLoaded', arguments.callee, false);
return;
}
if(!f1){setTimeout(arguments.callee, 300); return;}
f2 = f1.cloneNode(false);
f1.src = 'about: blank';
f2.frameBorder = '0';
f2.allowTransparency = 'yes';
f2.scrolling = 'no';
f1.parentNode.replaceChild(f2, f1);
}
})();
</script>

Second, the Iframe code in the <body> :

<iframe id="myiframeid" name="myiframename" src="somepage.html" width="100%"
frameborder="0" scrolling="no" onload='javascript:setIframeHeight(this.id);' />
</iframe>

Third and Last, the CSS:

#myiframeid{
width: 100%;
}

Note: You should have Name and ID for the Iframe.

Compatible with all browsers (Chrome, Firefox, IE).

Have a good day!

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javascript - How to auto shrink iframe height dynamically?

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