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

Question

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 ?

Answer 1

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);
}

Answer 2

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.

Answer 3

The iframe content comes from the same domain.

No success until now..

Answer 4

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.

Answer 5

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

Answer 6

$(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