Loading a string if HTML into an iframe using JavaScript

Question

I have a string of HTML tags that I can add to or change whenever I like.

"<html><body><script language="javascript" src=""></script></body></html>"

Is it possible to load that string at runtime into an Iframe as if it was an HTML file?

This is for Construct 2. I have an object that can load HTML from a url fine, it can also insert HTML, and run scripts, but not as is.

Answer 1

Sure, there are a couple of different options.

Via srcdoc (asyncronous):

iframe.srcdoc = html;

Via data URI (asyncronous):

iframe.src = 'data:text/html;charset=utf-8,' + escape(html);

Via document.write (syncronous, and works in really old browsers):

var idoc = iframe.contentWindow.document;
idoc.write(html);
idoc.close();

Answer 2

With Data URI , ( see browser support ) it's possible. The format as described is

data:[<mime type>][;charset=<charset>][;base64],<encoded data>.

You might not need to base64 encode your string unless the string has specific characters. This Snippet fulfills your needs:

 var iframe = document.getElementById('iframe'), htmlStr = "<html><body><h1>Hell World</h1></body></html>"; iframe.src = 'data:text/html,'+htmlStr;

 <iframe id="iframe" src="blank:"></iframe>

Answer 3

You can do it with

document.getElementById('iframe').src = "data:text/html;charset=utf-8," + escape(html);

See the following fiddle for an example