How to get scrollTop of an iframe

Question

jQuery\'s scrollTop returns null when window is an iframe. Has anyone been able to figure out how to get scrollTop of an iframe?

more info:

my script is runn

Answer 1

$('#myIframe').contents().scrollTop(0);

Only works with "0" as parameter

Answer 2

I have try to

$('#myIframe').contents().scrollTop(0);

and

 let scrollTop = document.getElementById(IFRAME_ID).contentWindow.document.body.scrollTop;

the first function work success in desktop browser. not working in mobile browser. so I use another function with scrollIntoView

$("#ButtonId").click(function() {
        var win = document.getElementById(IFRAMEID).contentWindow;
        var scrollTop = win.document.documentElement.scrollTop || win.pageYOffset || win.document.body.scrollTop;
        // scrollTop can getted
        if (scrollTop) {
            win.document.documentElement.scrollTop = 0;
            win.pageYOffset = 0; // safari
            win.document.body.scrollTop = 0;
        } else {
            win.document.body.scrollIntoView(true); // let scroll to the target view 
        }
    });

scrollIntoView() view in scrollIntoView - MDN

Answer 3

I have faced the same problem in my iframe. My whole website comming white iframe and scrolling not working So I used this code and it's work fine.

Step 1. put this code to your iframe

var offsettop =  120;
window.parent.postMessage({"setAnchor": offsettop}, "*");

Step 2. put this code where your call you iframe

window.addEventListener('message', function(event) {
  if(event.data['setAnchor']>0) {
    var offsetHeight =event.data['setAnchor'];
    jQuery('html, body').animate({
      scrollTop: offsetHeight
    }, 200);
  } 
})

Answer 4

Cause you using iFrame you will need to use it that way with windows "message" event

Read here for more Info

On Child View (Iframe)

window.top.postMessage(0 + '$' + 'form-iframe-top', "*");

On Parent View

   window.addEventListener("message",function(e) {
       if (e && e.data && typeof e.data == "string" && e.data != undefined) {
         var data = e.data.split("$");
             if (data.length == 2) {
               var scroll_height = data[0], iframe_id = data[1];
               if(iframe_id=="form-iframe-top"){
                   window.scrollTo(0,scroll_height);
                   return;
                  }
               }
          }
         },
        false
      );

**Note i used "*" as separator you can use anything

Answer 5

I know I'm late to the game here, but I was trying to figure this out for a long list on mobile. scrollTop() wasn't working for me due to cross-domain conflicts(and I didn't have access to parent window), but changing the height did:

$('#someClickableElementInIFrame').on('click', function(e){
      $("html body").animate({
      'height' : "0"
    }, {
        complete: function(){
          $("html body").css({
            'height' : "auto"
            })
          }
      })
});

Answer 6

You can set scrollTop by using this setup:

$("html,body").scrollTop(25);

So you could try getting it like this:

$("html,body").scrollTop();

Because different browsers set the scrollTop on different elements (body or html).

From the scrollTo plugin:

But that will probably still fail in certain browsers. Here is the relevant section from the source code of Ariel Flesher's scrollTo plugin for jQuery:

// Hack, hack, hack :)
// Returns the real elements to scroll (supports window/iframes, documents and regular nodes)
$.fn._scrollable = function(){
  return this.map(function(){
    var elem = this,
      isWin = !elem.nodeName || $.inArray( elem.nodeName.toLowerCase(), ['iframe','#document','html','body'] ) != -1;

    if( ! isWin ) {
      return elem;
    }


    var doc = (elem.contentWindow || elem).document || elem.ownerDocument || elem;

     return $.browser.safari || doc.compatMode == 'BackCompat' ?
       doc.body : 
       doc.documentElement;
  });
};

You may then run:

$(window)._scrollable().scrollTop();

To determine how far the iframe has scrolled down.