Insert JavaScript code from JavaScript

Question

i need gets a html code by jsonp like method, and display this on a div element. This works with simple html like an images, text, etc. But now the code can content a JavaScript tags and need insert this on a div, but the javascript, don't runs, i resume it with a example:

var div = document.getElementById('mydiv');

div.innerHTML = '<scipt type="text/javascript"> console.log('I run!'); </script>';

this don't works, too i probe:

var otherdiv = document.createElement('div');

otherdiv.innerHTML = '<scipt type="text/javascript"> console.log('I run!'); </script>';

div.appendChild(otherdiv);

But don't works too.

How I can insert the code in away that the JavaScript runs?

It should be <script>, not <scipt> (missing an R), and it'll have to be inserted into the live dom, not just dangling in nowhereland. — Marc B
– Marc B, Commented Apr 27, 2012 at 18:40
in your second snippet, make 'I run!' to "I run!" and it'll work. — KBN
– KBN, Commented Apr 27, 2012 at 18:41
You misspelled "script" and the quotes in your console.log are breaking up the string. — hugomg
– hugomg, Commented Apr 27, 2012 at 18:42
Ok ok sorry, i make a simple example on the fly, the real code is more complex. — Exos
– Exos, Commented Apr 27, 2012 at 18:50

Halcyon · Accepted Answer · 2012-04-27 18:45:15Z

1

The most straightforward way is to extract all JavaScript and eval it.

You can extract JavaScript with a regular expressions like:

var match = html.match(new RegExp("<script[^>]*>(.+)</script>"));
console.log(match);

This is a far from optimal way of executing JavaScript, very error prone and possibly unsafe. I would strongly advise against it.

answered Apr 27, 2012 at 18:45

Halcyon

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3 Comments

Exos Over a year ago

If is the only way :-(, this is a problem if the script have a document.write... I'm apply the code but it is dinamyc, i don't know the code before insert. The only way is replace /document.write[\s\t\n\r]*((.*))/ patterns by theParent.innerHTML(\1);

Halcyon Over a year ago

document.write is obscenely horrible.

Exos Over a year ago

Yeh, but i don't decide wath insert

BishopZ · Accepted Answer · 2012-04-27 18:41:37Z

0

You should use a script loader like LAB, yep/nope, or Frame.js. The browser has built-in restrictions, script loading is the best practice for including scripts on a page.

You also would have to escape the single quotes.

console.log(\'I run!\');

answered Apr 27, 2012 at 18:41

BishopZ

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