I have a cross domain iFrame. The actual iFrame works fine and displays the page at 100% height.
My problem is the first page is around 1200px tall then if you click a link within the iframe and the next page is 800px, you get a 400px blank space at the bottom.
So the iframe gets larger to fit the content but won't shrink. Below is my code:
Code which goes in the page to be iframed:
<!DOCTYPE html>
<head>
</head>
<body onload="parent.postMessage(document.body.scrollHeight, 'http://target.domain.com');">
<h3>Got post?</h3>
<p>Lots of stuff here which will be inside the iframe.</p>
</body>
</html>
Code which goes in to the page receiving the iframe:
<script type="text/javascript">
function resizeCrossDomainIframe(id, other_domain) {
var iframe = document.getElementById(id);
window.addEventListener('message', function(event) {
if (event.origin !== other_domain) return; // only accept messages from the specified domain
if (isNaN(event.data)) return; // only accept something which can be parsed as a number
var height = parseInt(event.data) + 32; // add some extra height to avoid scrollbar
iframe.height = height + "px";
}, false);
}
</script>
<iframe src='http://example.com/page_containing_iframe.html' id="my_iframe" onload="resizeCrossDomainIframe('my_iframe', 'http://example.com');">
</iframe>
Does anyone know how to modify the javascript so it shrinks too?
Thank you.
In your script other_domain equals 'http://example.com' - always. So if you click on 'http://example.com/somePage.html', your function will always return before resizing the iFrame. Instead of equals, you should use
if (event.origin.lastIndexOf(other_domain, 0) !== 0) return;
Related
I've googled a bit and there were a few leads, but I couldn't get any of those leads to work:
I have a page that has an iframe with the src pointing to an external page (cross domain). When the child/iframed page loads, it posts a message of its height. I put a console.log of the height in the javascript. If I open that page in a separate window (type the iframe's src URL in a separate tab, in other words), the console logs the expected height.
However, when I open the parent page with the iframe, the console logs either 0 or a very incorrect value of 150. I've looked through the css and html, and I don't have any specifications of 150.. Anyone have a clue what's going on here?
Abstracted code:
Parent HTML:
...
<iframe src="example.childpage.com" scrolling="no" frameBorder="0"></iframe>
...
Parent Javascript:
...
$(document).ready(function(){
window.addEventListener('message', function(m){
var messageData = m.data;
if(messageData.type=='document-loaded' &&
messageData.hasOwnProperty('height'){
resize_iframe(messageData.height); //function defined else where
//and works
};
});
...
IFrame Javascript:
...
$(document).ready(function(){
var body = document.body;
var html = document.documentElement;
var maxHeight = Math.max(body.scrollHeight, body.offsetHeight,
html.clientHeight, html.scrollHeight, html.offsetHeight);
//Logs height correctly when opened in a separate window but not when
//iframed
console.log("POSTING HEIGHT", maxHeight);
window.parent.postMessage({'type':'document-loaded', 'height': maxHeight},
PARENT_HOST_URL); //PARENT_HOST_URL defined elsewhere
});
...
I realize I have a mixture of jquery and vanilla javascript here; I've done both $(document).height() and the Math.max() shown above to get the height, but both ways still have the same issue.
Much thanks!
ok I finally found a good solution:
$('iframe').load(function() {
this.style.height =
this.contentWindow.document.body.offsetHeight + 'px';
});
Because some browsers (older Safari and Opera) report onload completed before CSS renders you need to set a micro Timeout and blank out and reassign the iframe's src.
$('iframe').load(function() {
setTimeout(iResize, 50);
// Safari and Opera need a kick-start.
var iSource = document.getElementById('your-iframe-id').src;
document.getElementById('your-iframe-id').src = '';
document.getElementById('your-iframe-id').src = iSource;
});
function iResize() {
document.getElementById('your-iframe-id').style.height =
document.getElementById('your-iframe-
id').contentWindow.document.body.offsetHeight + 'px';
}
I had a function that looped through not-yet-accessible elements and called $(element).hide() on them -- which sets the style display: none.
Turns out calculating the height of an element is respective of its visibility on the actual page, regardless of it being in an iframe. So the browser couldn't see it, so the height was being miscalculated (still weird it was returning a random 150px value). That explains why it was calculating correctly on a separate page.
Instead of doing hide(), I just set the visibility to hidden and that fixed my issue of getting the incorrect heights.
I have a div inside an iframe (no problems with origin policy as both the documents are from same application/domain). I need to figure out the distance of the div from parent window top. The iframe also has scrollbar, so that's one thing to consider too.
I can't produce a semi-working jsfiddle because of the cross origin policies (iframe.contentWindow won't be available), but here's the non-working fiddle anyway.
I have an embedded iframe in the fiddle:
<iframe src="https://noc2spam.github.io/embed.html?ddd" style="display:block; border:0; width:300px; height:200px; overflow:scroll"></iframe>
The following screenshot might give you an idea of what I exactly need.
I have already tried some of the answers which do not seem work for iframes. As for example, this does not work. What is the most convenient way of doing this?
In order to get the offset from top of the div contained in the iframe you have to SUM the DIV offset inside the IFRAME to the offset of the IFRAME inside the mainWindow.
To do so in Jquery (and postMessage between iframe and MainWindow):
/**
supposed:
#example-iframe = id of iframe
#example-div = id of DIV inside the iframe
*/
/** main.html -- top page */
$("#example-iframe")[0].contentWindow.postMessage({
cmd:"getDivDistance"
});
window.onmessage = function(e){
var msg = JSON.parse(e.data)
switch(msg.cmd){
case "setDivDistance":
var frametop = $("#example-iframe").offset().top
var totaltop = frametop + msg.top;
alert("MY TOP IS "+totaltop);
break;
}
};
/** frame.html -- iframe page*/
window.onmessage = function(e){
var msg = JSON.parse(e.data)
switch(msg.cmd){
case "getDivDistance":
window.top.postMessage({
cmd:"setDivDistance",
top:$("#example-div").offest().top
});
break;
}
}
I have an iframe and I want to re-size the height according to the content which may resize if user makes certain actions.
I don't want a scroll bar so it appears as a normal page
Use a div instead of an iFrame. Try posting some sample code so we can help you more. Generally, you cannot resize an iframe based on its content.
scrollHeight is the major property to retrieve the height of the IFRAME's content like this:
contentWindow.document.body.scrollHeight
After the IFRAME is loaded, you can then change the height by doing the following:
<script type="text/javascript">
function resizeIframe() {
var iFrameID = document.getElementById('idIframe');
if(iFrameID) {
var cont = iFrameID.contentWindow.document.body || frame.contentDocument.body
// here you can make the height
iFrameID.height = cont.scrollHeight + "px";
}
}
</script>
On the IFRAME load event, you can call this function:
But sure..iframe should not be loaded from other website
my problem is when I load iframe it's set height of iframe correctly and also when data(content) load in iframe it;s automatically set height ,BUT when page load in iframe and set height relatively page content and then if I reduce or delete content from loaded page it will not reduce iframe height.(e.g when page load first time height set 100px and dynamically load data on page iframe height set to 150px and when I reduce data it's not set height of iframe it remain 150px). This is my code:
function setIframeHeight(iframe) {
if (iframe) {
var iframeWin = iframe.contentWindow || iframe.contentDocument.parentWindow;
if (iframeWin.document.body) {
iframe.height = iframeWin.document.documentElement.scrollHeight || iframeWin.document.body.scrollHeight;
}
setInterval("setIframeHeight_id('" + iframe.id + "')", 2000);
}
return false;
}
function setIframeHeight_id(iframeid) {
var iframe = document.getElementById(iframeid);
if (iframe) {
var iframeWin = iframe.contentWindow || iframe.contentDocument.parentWindow;
if (iframeWin.document.body) {
iframe.height = iframeWin.document.documentElement.scrollHeight || iframeWin.document.body.scrollHeight;
}
}
return false;
}
function resizeIframe(nm) {
setIframeHeight(document.getElementById(nm));
}
HTML
<iframe id="IframeData" scrolling="no" frameborder="0" width="100%" onload="resizeIframe('IframeData')" allowtransparency="true"></iframe>
I would highly suggest you to use jQuery instead of plain JavaScript. It won't do a miracle by itself, but will sure help you shorten your code.
When it comes to your problem, why not using percentage sizes instead of fixed pixel size? Let's say your iframe's height is set to 100%, instead of 150px. By doing this way, next time you resize the parent container, the iframe itself will stretch to parent's height.
I hope this helps.
I would like to have an iframe take as much vertical space as it needs to display its content and not display a scrollbar. Is it at all possible ?
Are there any workarounds?
This should set the IFRAME height to its content's height:
<script type="text/javascript">
the_height = document.getElementById('the_iframe').contentWindow.document.body.scrollHeight;
document.getElementById('the_iframe').height = the_height;
</script>
You may want to add scrolling="no" to your IFRAME to turn off the scrollbars.
edit: Oops, forgot to declare the_height.
The workaround is not to use <iframe> and preprocess code on server-side.
Also check out this thread: How does the DiggBar dynamically resize its iframe's height based on content not on their domain?.
It addresses the same question.
This CSS snippet should remove the vertical scrollbar:
body {
overflow-x: hidden;
overflow-y: hidden;
}
I'm not sure yet about having it take up as much vertical space as it needs, but I'll see if I can't figure it out.
Adding a DOCTYPE declaration to the IFRAME source document will help to calculate the correct value from the line
document.getElementById('the_iframe').contentWindow.document.body.scrollHeight
see W3C DOCTYPE for examples
I was having problems with both IE and FF as it was rendering the iframe document in 'quirks' mode, until I added the DOCTYPE.
FF/IE/Chrome support: The .scrollHeight doesnt work with Chrome so I have come up with a javascript example using jQuery to set all IFRAME heights on a page based on the iframes content. NOTE: This is for reference pages within the your current domain.
<script type="text/javascript">
$(document).ready(function(){
$('iframe').each(function(){
var context = $(this);
context.load(function(event){ // attach the onload event to the iframe
var body = $(this.contentWindow.document).find('body');
if (body.length > 0 && $(body).find('*').length > 0) { // check if iframe has contents
context.height($(body.get(0)).height() + 20);
} else {
context.hide(); // hide iframes with no contents
}
});
});
});
</script>