Develop Reference

Setting the Scale of an iFrame

I'm creating a website which hosts games, and like many, I use the wonderful <iframe> tag to get the game from a seperate directory. I am trying to get the <iframe> to size itself to 600px wide and let the height automatically adjust itself.
I have tried using the CSS transform property, but it has to be a percent, not an amount in pixels. I have also tried using Javascript to get the scroll height and the scroll width of the <iframe> and set the width to 600px while setting the height to the height of the content.
Here's my markup, script, and stylesheet.
HTML:
<div class="game-border" id="gameBack">
<iframe src="http://superfungames.com/tetris/" class="game-frame" id="gameCont" frameborder="0" scrolling="no"></iframe>
</div>
<!-- Counteract the evil effects of centering the game-border and game-frame by using position absolute !-->
<div class="breaker" id="breaker"></div>
Javascript:
var gameBack = document.getElementById('gameBack');
var breaker = document.getElementById('breaker');
var iFrame = document.getElementById('gameCont');
var iframeWin = iFrame.contentWindow || iFrame.contentDocument.parentWindow;
var iFrameHeight = iframeWin.document.documentElement.scrollHeight || iframeWin.document.body.scrollHeight;
iFrame.style.height = iFrameHeight + 'px';
gameBack.style.height = gameBack.scrollHeight + 25 + 'px';
gameBack.style.width = gameBack.scrollWidth + 25 + 'px';
//Counteract position absolute. Additional number is like margin-top.
breaker.style.height = gameBack.scrollHeight + 10 + 'px';
CSS:
.game-frame {
width: 600px;
height: auto;
overflow: visible;
}
.game-border {
background-color: #63d68f;
position: absolute;
left: 50%;
transform: translate(-50%, 0%);
display: flex;
justify-content: center;
align-items: center;
overflow: visible;
}
I expect that the <iframe> would be 600px wide and the height of the content tall, however, it is 600px and only has the very top of the content showing.

The iframe tag counts with a width attribute, you only need to add width="{number_of_pixels}". Example: <iframe src="{any_website_url}" widht="600"></iframe>, this sets the width to 600px.
It should work in most sites (I guess), however this doesn't work with the website you are using. It seems that it uses some script that redirects you to their websit instead of displaying it in an iframe.
To solve this you can add the attribute sandbox. This will block some features of the website, like the one that redirects you to their website. Example: <iframe src="{any_website_url}" sandbox></iframe>. I am not sure if this will break anything about the game itself. You can try to investigate more.
Your HTML will be something like this. There is no need to change the js file nor the css file.
<div class="game-border" id="gameBack">
<iframe src="http://superfungames.com/tetris/" width='600' class="game-frame" id="gameCont" frameborder="0" scrolling="no" sandbox></iframe>
</div>
<!-- Counteract the evil effects of centering the game-border and game-frame by using position absolute !-->
<div class="breaker" id="breaker"></div>
More info:
HTML iframe width attribute
Why does <iframe src=“https://”></iframe> redirect the page in IE 11?

google+ comments and javascript

I'm working on a wordpress plugin that is supposed to add a google+ comments section next to an embedded video. I can use javascript to get the correct width initially, but the scripts that auto load in the Iframe document automatically change the size to 100% width if the browser size is changed (see images). I am having serious difficulty accessing the div in the document under the Iframe to change its with to what I want when it resizes.
how it should be.
after adjusting the browser size it jumps below and goes to 100% width.
I'm using thise code to generate the comments section:
<script src="https://apis.google.com/js/plusone.js"></script>
<div id="comments"></div>
<script>
gapi.comments.render('comments', {
href: [URL],
width: 'comments_w',
first_party_property: 'BLOGGER',
view_type: 'FILTERED_POSTMOD'
});
"comments_w" is a variable that is calculated in an earlier javascript based on the space left after the video's width is calculated.
this is the Iframe being gnerated inside the comments div
<iframe frameborder="0" hspace="0" marginheight="0" marginwidth="0" scrolling="no" style="position: static; top: 0px; width: 1138px; margin: 0px; border-style: none; left: 0px; visibility: visible; height: 616px;" tabindex="0" vspace="0" width="100%" id="I0_1480032087207" name="I0_1480032087207" src="https://apis.google.com/u/0/_/widget/render/comments?usegapi=1&href=http%3A%2F%2Fwww.cellcycle.net%2Ftemppage%2F&width=341&first_party_property=BLOGGER&view_type=FILTERED_POSTMOD&origin=http%3A%2F%2Fwww.cellcycle.net&search=&hash=&gsrc=3p&jsh=m%3B%2F_%2Fscs%2Fapps-static%2F_%2Fjs%2Fk%3Doz.gapi.en.CUXyo_wPfp0.O%2Fm%3D__features__%2Fam%3DAQ%2Frt%3Dj%2Fd%3D1%2Frs%3DAGLTcCMYqx5cA6SdMRKSM5YaRVPo-xpcPg#_methods=onPlusOne%2C_ready%2C_close%2C_open%2C_resizeMe%2C_renderstart%2Concircled%2Cdrefresh%2Cerefresh%2Cscroll%2Copenwindow&id=I0_1480032087207&parent=http%3A%2F%2Fwww.cellcycle.net&pfname=&rpctoken=30831408" data-gapiattached="true" title="Comment on this"></iframe>
#document == $0
<html est...>
</iframe>
There is a div inside the body that controls the width. I just need to find a way to access it with javascript and change the size whenever the browser is resized. I already have the function I want being called whenever it is resized. I am just having a hard time with getting jQuery to find the element inside the document.

Ok confirmed this is not possible. as Jaromanda X pointed out the origin must be the same. I looked into origin policy here (https://en.wikipedia.org/wiki/Same-origin_policy) and found out for sure. Kind of unfortunate for me, but hope this prevents anyone else from wasting time trying to.

Re size iframe based on width of window

I have an iframe embedded in a third party website, which I cannot edit in any way.
I want the iframe to re-size according to the width of the window.
If I was able to edit the whole page, this would not be a problem.
However, when setting the size of an element in %, it uses the parent of that element to size from. In the case of the page I am working with, the parent elements do not re-size, so this does not work.
What I need, is a way of telling the iframe to re size, based solely on the width of the window, and preferably using only CSS.
Is this possible using only CSS? If not is it possible using JQuery or JavaScript?

Try this:
http://jsfiddle.net/6aLxaag8/2/
This jsfiddle loads a second jsfiddle in the iframe.
There's a hardcoded style attribute on the IFrame that sets the width; 100vw or 100% of the width of the viewing window in which the element sits, regardless of it's position in the DOM. As you don't have access to the parent page you'll need to use a style attribute and you may not be able to use javascript to add it (check cross site scripting).
Support isn't perfect with vw units, but it's close.
PS, it's hard to know if this will work without trying it in your context, please let me know :-)

I have encountered that problem before and I use this css trick, this adjust to the width & height of any wrapper/div so if you have embed an iframe inside a div with 'height: 620px' and 'width: 420px' the iframe size adjust to the div's height and width. Just change both width & height of the div to 100% percent.
.content_here {
width: 420px;
height: 620px;
}
iframe#iframecontent {
display:block;
position: absolute;
top: 0;
bottom: 0;
left: 0;
right: 0;
height: 100%;
width: 100%;
}
<div class="content_here">
<iframe id="iframecontent" src="http://www.bootstrapcdn.com/" frameborder="0" marginwidth="0" marginheight="0" scrolling="auto"></iframe>
</div>

Capability to control content of the iframe size through the content's url - javascript to take advantage of this

EDIT: What's right below this has been answered - see the question below it for the current question that has arisen from that answer.
The below code makes the page fit the screen, and I can size the iframe to be any height or width that I want, and the page will not scroll. THis is what I want. However, I don't just want the page to cut the iframe off. I want the iframe to stretch/shrink to fit the browser window. How can I achieve this efficiently? Can it be done without javascript? If javascript is needed for this, please provide a beginner level explanation, or a good tutorial link; I'm new with JS.
Here is what I have so far:
HTML:
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" type="text/css" href="style/style.css">
</head>
<body>
<div class="wrapper">
<iframe id="myIframe" src="https://#.com" border="0" scrolling="no" frameborder="0">
</iframe>
</div>
</body>
</html>
CSS:
body, html {
margin: 0;
padding: 0;
}
.wrapper {
height: 100%;
width: 100%;
overflow: hidden;
position: absolute;
margin: 0;
padding: 0;
}
EDIT! It just so happens that this particular page that I want to use in the iframe here offers a very interesting control feature in the url itself! The url allows size control. So this leads me to ask a new question, which involves using a javascript. My new question is this:
Can I use some sort of JS script to take advantage of the size control here in the url
<iframe id="myIframe" src="https://media.embed.ly/1/frame?url=http%3A%2F%2Fwww.twitch.tv%2Fgamemode_mc_&width=1280&height=1280&secure=true&key=0202f0ddb5a3458aabf520e5ab790ab9&"
to dynamically force the size of the iframe content to match the user's browser window?
This will combine the solution to my original question with a secondary solution to provide the perfect fix for my problem here.
(My goal here is actually to place this Twitch feed as a background to my webpage - resizing the actual content of the iframe is actually a very unlikely but seemingly possibly additional treat here!)

I think what you are attempting to accomplish can be done with the following in tour CSS
#myIframe {
height: 100%;
width: 100%
}

If you are trying to stretch the content of iframe then.....
You will have to write css that will give proportional height and width to all elements in the iframe document
if the iframe href is not from your domain then there is no way to achieve this.
Overall, there is no way to stretch the content of page so that all things are visible on the screen without scrollbar.

Scrolling an iframe with JavaScript?

I dynamically load an iframe with JavaScript. After it's loaded, how can I make it scroll down a specific number of pixels (ie. after the page in the iframe has loaded, how can I make the iframe scroll by itself to the a specified region of the page?)

You can use the onload event to detect when the iframe has finished loading, and there you can use the scrollTo function on the contentWindow of the iframe, to scroll to a defined position of pixels, from left and top (x, y):
var myIframe = document.getElementById('iframe');
myIframe.onload = function () {
myIframe.contentWindow.scrollTo(xcoord,ycoord);
}
You can check a working example here.
Note: This will work if both pages reside on the same domain.

Inspired by Nelson's and Chris' comments, I've found a way to workaround the same origin policy with a div and an iframe:
HTML:
<div id='div_iframe'><iframe id='frame' src='...'></iframe></div>
CSS:
#div_iframe {
border-style: inset;
border-color: grey;
overflow: scroll;
height: 500px;
width: 90%
}
#frame {
width: 100%;
height: 1000%; /* 10x the div height to embrace the whole page */
}
Now suppose I want to skip the first 438 (vertical) pixels of the iframe page, by scrolling to that position.
JS solution:
document.getElementById('div_iframe').scrollTop = 438
JQuery solution:
$('#div_iframe').scrollTop(438)
CSS solution:
#frame { margin-top: -438px }
(Each solution alone is enough, and the effect of the CSS one is a little different since you can't scroll up to see the top of the iframed page.)

Inspired by Nelson's comment I made this.
Workaround for javascript Same-origin policy with regards to using.ScrollTo( ) on document originating on an external domain.
Very simple workaround for this involves creating a dummy HTML page that hosts the external website within it, then calling .ScrollTo(x,y) on that page once it's loaded. Then the only thing you need to do is have a frame or an iframe bring up this website.
There are a lot of other ways to do it, this is by far the most simplified way to do it.
*note the height must be large to accommodate the scroll bars maximum value.
--home.html
<html>
<head>
<title>Home</title>
</head>
<frameset rows="*,170">
<frame src=body.htm noresize=yes frameborder=0 marginheight=0 marginwidth=0 scrolling="no">
<frame src="weather.htm" noresize=yes frameborder=0 marginheight=0 marginwidth=0 scrolling="no">
</frameset>
</html>
--weather.html
<html>
<head>
<title>Weather</title>
</head>
<body onLoad="window.scrollTo(0,170)">
<iframe id="iframe" src="http://forecast.weather.gov/MapClick.php?CityName=Las+Vegas&state=NV&site=VEF&textField1=36.175&textField2=-115.136&e=0" height=1000 width=100% frameborder=0 marginheight=0 marginwidth=0 scrolling=no>
</iframe>
</body>
</html>

Use the scrollTop property of the frame's content to set the content's vertical scroll-offset to a specific number of pixels (like 100):
<iframe src="foo.html" onload="this.contentWindow.document.documentElement.scrollTop=100"></iframe>

A jQuery solution:
$("#frame1").ready( function() {
$("#frame1").contents().scrollTop( $("#frame1").contents().scrollTop() + 10 );
});

Based on Chris's comment
CSS
.amazon-rating {
width: 55px;
height: 12px;
overflow: hidden;
}
.rating-stars {
left: -18px;
top: -102px;
position: relative;
}
HAML
.amazon-rating
%iframe.rating-stars{src: $item->ratingURL, seamless: 'seamless', frameborder: 0, scrolling: 'no'}

Or, you can set a margin-top on the iframe...a bit of a hack but works in FF so far.
#frame {
margin-top:200px;
}

The main issue when programming the scroll is related to getting the whole document embedded into the page, remember than an Iframe would be a full-page (head and all) inside your main doc, for this reason, before actually scrolling, you need to get the inner document, not just the container, so you can actually scrollTo.
We add a validation to sendure compatibility, and the differences betwen contentDocument and windows can be found here
Havign this, the final code would be:
var $iframe = document.getElementByID('myIfreme');
var childDocument = iframe.contentDocument ? iframe.contentDocument : iframe.contentWindow.document;
childDocument.documentElement.scrollTop = 0;

I've also had trouble using any type of javascript "scrollTo" function in an iframe on an iPad. Finally found an "old" solution to the problem, just hash to an anchor.
In my situation after an ajax return my error messages were set to display at the top of the iframe but if the user had scrolled down in what is an admittedly long form the submission goes out and the error appears "above the fold". Additionally, assuming the user did scroll way down the top level page was scrolled away from 0,0 and was also hidden.
I added
<a name="ptop"></a>
to the top of my iframe document and
<a name="atop"></a>
to the top of my top level page
then
$(document).ready(function(){
$("form").bind("ajax:complete",
function() {
location.hash = "#";
top.location.hash = "#";
setTimeout('location.hash="#ptop"',150);
setTimeout('top.location.hash="#atop"',350);
}
)
});
in the iframe.
You have to hash the iframe before the top page or only the iframe will scroll and the top will remain hidden but while it's a tiny bit "jumpy" due to the timeout intervals it works. I imagine tags throughout would allow various "scrollTo" points.