How can I detect a Scrollbar presence ( using Javascript ) in HTML iFrame ?

How can I detect a Scrollbar presence ( using Javascript ) in HTML iFrame ?

I have already tried :

        var vHeight = 0;
     if (document.all) {
       if (document.documentElement) {
         vHeight = document.documentElement.clientHeight;
       } else {
         vHeight = document.body.clientHeight
       }
 } else {
   vHeight = window.innerHeight;
 }

 if (document.body.offsetHeight > vHeight) {
   //when theres a scrollbar
 }else{
   //when theres not a scrollbar
 }

And I also had tried :

           this.scrollLeft=1;
 if (this.scrollLeft>0) {
  //when theres a scrollbar
  this.scrollLeft=0;
  }else{
  //when theres not a scrollbar
  return false;
 }

With no success..

I have searched the javascript objets on DOM Inspector, but didn't find anything.

Is is possible to detect a scrollbar presence in a iframe in javacscript ?

From stackoverflow

• In jQuery you can compare the document height, the scrollTop position and the viewport height, which might get you the answer you require.

  Something along the lines of:

  $(window).scroll(function(){
    if(isMyStuffScrolling()){
      //There is a scroll bar here!
    }
  }); 
  
  function isMyStuffScrolling() {
    var docHeight = $(document).height();
    var scroll    = $(window).height() + $(window).scrollTop();
    return (docHeight == scroll);
  }
  

  Code Burn : Thank you for your answer, but your code only tests when I try to move the scrollbar. I want a to test it on page load.

• I do not think this can be done if the iframe content comes from another domain due to JavaScript security limitations.

  EDIT: In that case, something along the lines of giving the iframe a name='someframe' and id='someframe2' and then comparing frames['someframe'].document.body.offsetWidth with document.getElementById('someframe2').offsetWidth should give you the answer.

  Code Burn : The iframe content comes from the same domain.

• The iframe content comes from the same domain.

  No success until now..

• var root= document.compatMode=='BackCompat'? document.body : document.documentElement;
  var isVerticalScrollbar= root.scrollHeight>root.clientHeight;
  var isHorizontalScrollbar= root.scrollWidth>root.clientWidth;
  

  This detects whether there is a need for a scrollbar. For the default of iframes this is the same as whether there is a scrollbar, but if scrollbars are forced on or off (using the ‘scrolling="yes"/"no"’ attribute in the parent document, or CSS ‘overflow: scroll/hidden’ in the iframe document) then this may differ.

• I think your second attempt is on the right track. Except instead of this, you should try scrolling/checking document.body.

• $(window).scroll(function(){
    if(isMyStuffScrolling()){
  //scrolling
    }else{
  //not scrolling
  }
  }); 
  
  function isMyStuffScrolling() {
    var docHeight = $(document).height();
    var scroll    = $(window).height() ;//+ $(window).scrollTop();
    if(docHeight > scroll) return true;
    else return false;
  }
  

  improved-changed a bit from Jon`s Winstanley code