Iframe Auto Adjusting Its Height To Fit To The Content Height

September 29, 2023 Post a Comment

I have already tried some of the tips they are answered to regarding this iframe auto height problem. Basically, what I want is auto adjusting the iframe's height dynamically, acco

Solution 1:

The Snippet of course is not functioning, I just put it there to fulfill the post requirements. Please read this README.md and review the Plunker demo. All the details are in the README.md and posted here as well.

README.md

iFrame Dynamic Height

This demo works under the Same Origin Policy, simply put, the parent children pages must be in the same location:

Same protocol (http://)
Same sub-domain (http://app.)
Same domain (http://app.domain.com)
Same port (http://app.domain.com:80)
- There's 3 children pages at varying heights.
  - iFrm1,html
  - iFrm2.html
  - iFrm3.html
- Preparing layout and iframe attributes are important when we are going to control iframes.
  - The first step is done already when we established where exactly the parent and children pages are by fulfilling the requirements of the Same Origin Policy.

CSS:

/* Outer Container */#iSec {
  width: 100vw;  /* As wide as your screen */height: 100vh; /* As tall as your screen */display: table;/* Will behave like a table */
}


/* iFrame Wrappers */.jFrame {
   position: relative; /* As a non-static element, any descendants can be easily positioned. */max-height: 100%; /* Being flexible is important when dealing with dynamic content. */max-width: 100%; /* see above */overflow-y: auto; /* Scrollbars will appear when height exceeds the viewport (your screen)*/display: table-cell; /* Will behave like a table-cell
}

/* iFrames */iframe {
   position: absolute; /* Easily positioned within it's parent (`.jFrame`)*/width: 100%; /* Set the iFrames' attribute as well */height: 100%; /* Set the iFrames' attribute as well */top: 0;  /* Streches iframes' edges */left: 0;
   bottom: 0;
   right: 0;
 }

iFrame:

<iframe id="iFrm1" src="iFrm1.html" width="100%" height="100%" scrolling="no" frameborder="0"></iframe>

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The majority of the code I borrowed and modified is from this site

// Collect all iframes into a NodeList, convert to an array, then call iFrmHt(), and pass on the ids of each iFrame.

functionloadiFrames() {
  var iFrmList = document.querySelectorAll('iframe');
  var iFrmArray = Array.prototype.map.call(iFrmList, function(obj) {
    varID = obj.id;
    iFrmHt(ID);
  });
}

// Reference the Document of the target iFrame

functioniFrmHt(ID) {
  var iFrm = document.getElementById(ID);
  var iDoc = iFrm.contentDocument || iFrm.contentWindow.document;
  var iHt = function(iDoc) {
    if (!iDoc) {
      iDoc = document;
    }
    var iKid = iDoc.body;
    var iRoot = iDoc.documentElement;

// Determine iFrame's child page-- height with several different methods to measure.

var iHt = Math.max(iKid.scrollHeight, iKid.offsetHeight,
      iRoot.clientHeight, iRoot.scrollHeight, iRoot.offsetHeight);
    return iHt;
  }

// Change the height of the iFrame

  iFrm.style.height = iHt + 'px';
  console.log('iFrame: ' + iFrm.id);
  console.log('height: ' + iHt(iDoc));
}

// If you load on window load, there shouldn't be any timeouts from the iFrames.

window.onload = loadiFrames;

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

SNIPPET

<!doctype html><html><head><metacharset="utf-8"><title>iFrame Dynamic Height</title><style>#iSec {
      width: 100vw;
      height: 100vh;
      display: table;
    }
    .jFrame {
      position: relative;
      max-height: 100%;
      max-width: 100%;
      overflow-y: auto;
      display: table-cell;
    }
    iframe {
      position: absolute;
      width: 100%;
      height: 100%;
      top: 0;
      left: 0;
      bottom: 0;
      right: 0;
    }
  </style></head><body><sectionid="iSec"><divid="i1"class="jFrame"><iframeid="iFrm1"src="iFrm1.html"width="100%"height="100%"scrolling="no"frameborder="0"></iframe></div><divid="i2"class="jFrame"><iframeid="iFrm2"src="iFrm2.html"width="100%"height="100%"scrolling="no"frameborder="0"></iframe></div><divid="i3"class="jFrame"><iframeid="iFrm3"src="iFrm3.html"width="100%"height="100%"scrolling="no"frameborder="0"></iframe></div></section><script>functionloadiFrames() {
      var iFrmList = document.querySelectorAll('iframe');
      var iFrmArray = Array.prototype.map.call(iFrmList, function(obj) {
        varID = obj.id;
        iFrmHt(ID);
      });
    }

    functioniFrmHt(ID) {
      var iFrm = document.getElementById(ID);
      var iDoc = iFrm.contentDocument || iFrm.contentWindow.document;
      var iHt = function(iDoc) {
        if (!iDoc) {
          iDoc = document;
        }
        var iKid = iDoc.body;
        var iRoot = iDoc.documentElement;
        var iHt = Math.max(iKid.scrollHeight, iKid.offsetHeight,
          iRoot.clientHeight, iRoot.scrollHeight, iRoot.offsetHeight);
        return iHt;
      }
      iFrm.style.height = iHt + 'px';
      console.log('iFrame: ' + iFrm.id);
      console.log('height: ' + iHt(iDoc));
    }

    window.onload = loadiFrames;
  </script></body></html>

Solution 2:

Another user posted this question and solution on StackOverflow a number of years ago.

Full-screen iframe with a height of 100%

This approach uses CSS instead of JS to set the dimensions of the IFRAME.

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