Within my application, there is a select drop-down menu that contains URLs. When a user selects a URL from the drop-down menu, I want to load that URL in an iframe with the appropriate content size. I am looking for a way to increase the height of the iframe dynamically based on the content without adding a scrollbar. Can anyone provide guidance on how to resize the iframe according to the URL content without displaying a scroll bar within the iframe?
iframes have a limitation in automatically adjusting to fit the size of their target content. Essentially, there isn't an "auto" value for the width or height of an iframe, you must specify the dimensions of the frame.
To address this issue, you need to determine the size of the content beforehand so that you can pass it to your iframe along with the designated URL. One way to achieve this is by using data attributes.
Instead of specifying the width and height directly in the iframe tag, you can set them dynamically based on the selected URL from a dropdown menu using the following HTML and JavaScript/jQuery code:
<select id="frameURL">
<option value="http://www.url1.com/" data-cheight="600">URL 1</option>
<option value="http://www.url2.com/" data-cheight="750">URL 2</option>
<option value="http://www.url3.com/" data-cheight="1200">URL 3</option>
</select>
<iframe scrolling="no" style="display:none;" id="myFrame" src=""></iframe>
$("#frameURL").change(function(){
// Get the selected URL
var target = $(this).find("option:selected").val();
// Default fixed width of content area
var cntWidth = 500;
// Get content height from data-cheight attribute
var cntHeight = $(this).find("option:selected").attr("data-cheight");
// Pass all attributes to the iframe
$("#myFrame").attr({
src: target,
width: cntWidth,
height: cntHeight
});
// Hide iframe when src attribute is empty (no URL chosen)
!$("#myFrame").attr("src") ? $("#myFrame").hide() : $("#myFrame").show();
});
Check out the working model: https://jsfiddle.net/xxgs901u/3/
Accessing the content of an iframe directly from its parent window is not possible. However, if the iframes' sources are internal pages of your application, you can use cross-document messaging to achieve this.
Example code for the iframe:
$(document).ready(function() {
parent.postMessage({ size: { height: $('html').height(), width: $('html').width() } }, "*");
});
Example code for the parent window:
$(document).ready(function() {
// Create event handler compatible with IE and other browsers
var eventMethod = window.addEventListener ? "addEventListener" : "attachEvent";
var eventer = window[eventMethod];
var messageEvent = eventMethod == "attachEvent" ? "onmessage" : "message";
// Listen for messages from the child window
eventer(messageEvent, function(e) {
$('iframe').width(e.data.size.width);
$('iframe').height(e.data.size.height);
}, false);
});
If necessary, you can send additional resize events if the content within the iframe changes dimensions.
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