Adjust the size of an IFRAME to eliminate scrollbars from appearing

My webpage features an iframe that needs to be resized dynamically each time its contents change in order to eliminate scrollbars. The content inside the iframe frequently changes without altering the URL. I desire for all the content within the frame to be visible at all times, without causing any screen flickering during the resizing process. Both the parent and the frame are hosted on the same domain.

Currently, I have a function that I call to adjust the frame size whenever I believe it has changed. How can I streamline this process without having to call the function multiple times?

For reference, my website is built using AngularJS.

javascriptdomangularjs

Answer №1

To determine the height of an iframe's content, use 

.contentWindow.document.body.offsetHeight
. If you are unsure when the content size changes, you will need to periodically check it using setInterval().

Answer №2

Check out iframe-resizer, a convenient JavaScript module that automatically resizes iframes.

Answer №3

To ensure that the re-size function is called, you can set up an event listener to trigger it whenever the iframe is loaded.

var myFrame = document.getElementById('myIframe');
    var resizeFrame = function() {
        $("#myIframe").css({
            height: myFrame.$("body").outerHeight()
        });
    };
    if(myFrame.addEventListener){
        myFrame.addEventListener('load', resizeFrame, true);
    } else if (myFrame.attachEvent){
        myFrame.attachEvent('onload', resizeFrame);
    }

Answer №4

I have successfully implemented this function on one of my websites by transforming the code into a directive.

Important: Ensure that your container in the iframe is identified with the ID ifrm_container

<iframe resize-iframe id="iframe" src="...">

.directive('resize-iframe', function() {
    return {
       restrict: 'A',
       link: function ( scope, elm, attrs ) {

        var container = elm.contentWindow.document.getElementById('ifrm_container'); // The container within the iframe.

        function autoResize(){
             ifrmNewHeight = container.offsetHeight; // The new height of the document.

             if(ifrmNewHeight !== ifrmOldHeight) {
                ifrmOldHeight = ifrmNewHeight + 30; // Adding 30 for no scrollbar.
                ifrm.style.height= (ifrmNewHeight + 30) + "px"; // Setting the iframe style.
             }

            setTimeout(autoResize, 250);
        }
      // Initial call to autoResize().
      autoResize();
  };
});

I have tested this solution across all browsers, including IE7, and it performs effectively. However, some adjustments may be needed when using it in a directive.

PLEASE NOTE: THIS DIRECTIVE HAS NOT BEEN FULLY TESTED YET

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