Will it be possible to send postMessage to a nested iframe ?
I have parent page [ http://localhost:8765/home.html ], I have declared postMessage function in the parent page as below snippet
// home.html [http://localhost:8765/homr.html]
<html>
<script>
function test1(){
document.getElementById('tableauFrame').contentWindow.postMessage("success", "*")
}
</script>
<body>
child ui <br>
<iframe width='2000px' height='2000px' src='http://localhost:8766/child.html' id='tableauFrame' onload=test1()></iframe>
</body>
</html>
Inside parent page, it will call another browser to an iframe , in child browser it has another iframe which is calling page2.
//child.html [ http://localhost:8766/child.html ]
<html>
<body>
<p>Child page</p>
<iframe src='http://localhost:8766/page2.html' id='secondary'></iframe>
</body>
</html>
if it was just a single iframe [ parent (home.html) to child(child.html)] , it will work and receive the message , but when I tried a nested iframe parent(home.html) to grandchild[page2.html] element, it is not receiving the postMessage.
// grandchild [ http://localhost:8766/page2.html ]
<html>
<script>
window.addEventListener('message',function(message){
if (event.origin === "http://localhost:8765") {
console.log("displaying message from parent page : " + message.origin)
}
})
</script>
<body>
<p>this is getting from 3rd page</p>
</body>
</html>
Does postMessage only work on a single frame ?
Window messages don't "bubble down"; you can either:
window.parent or even window.top, and handle all message posting on the topmost window; ordocument.getElementById('tableauFrame').contentDocument.querySelector('iframe').contentWindow.postMessage("success", "*")