Issue communication with postMessage from parent to child iFrame

Question

I\'m having an issue communicating from my parent window to the child iFrame. But in the other side, everything works perfectly. Here is how I get the chil iFrame object in

Answer 1

Below code also works.

$('#id')[0].contentWindow.postMessage("hello world",targetOrigin);

There is a difference between jQuery selector and document.getElementById.

Document.getElementByID returns HTML DOM object.
jQuery selector returns jQuery object.

For more information please find below link. document.getElementById vs jQuery $()