Filling an IFRAME with dynamic content from JavaScript

I have an IFRAME that should be filled with content from JavaScript. Had the content be on the server all I had to do is:

    function onIFrameFill() {
         myIframe.location.href = "HelloWorld.html";
     }

But the content I have is a HTML page generated on the client and represented as a string (I have not much inf开发者_运维技巧luence on it). How can I populate the content of the my iframe programatically?

I think you're looking for something like:

var iframeDoc = myIframe.contentWindow.document;
iframeDoc.open();
iframeDoc.write('hello world');
iframeDoc.close();

Tried setting .innerHTML but that does not work. Solution by Jeffery To works. Just want to add that myIframe.contentWindow might not work in old browsers (read IE old versions) so you can do

var iFrameWindow = myIframe.contentWindow || myIframe.documentWindow;
var iFrameDoc = iFrameWindow.document;

then use the document open(), write() & close() as above.

What about .innerHTML?

myIframe.innerHTML = "This is some HTML <b>text</b>";

Similar to Jeffry but using contentDocument instead.

let iframe = document.querySelector('iframe');
let doc = iframe.contentDocument;
doc.open();
doc.write('Hello world!');
doc.close();