Running code from a string

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ofiras - 31 Jul 2009 16:22 GMT

Hi,
I have a JavaScript code that fetches code lines from another page
into a string, but I don't know how to run this code in the page I
need.
I've tried this but it didn't work:

var code; //my javascript code
document.getElementById('tojs1').innerHTML = 'function fill_mish1()
{'+ code +'}';
fill_mish1();

While in my page there is a line:

<script id='tojs1' type=text/javascript> </script>

Please help,
Ofir.

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Martin Honnen - 31 Jul 2009 16:28 GMT

> I have a JavaScript code that fetches code lines from another page
> into a string, but I don't know how to run this code in the page I
[quoted text clipped - 5 lines]
> {'+ code +'}';
> fill_mish1();

That sounds like a justified use of eval:
eval(code);

Signature

Martin Honnen
http://msmvps.com/blogs/martin_honnen/

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ofiras - 31 Jul 2009 20:40 GMT

> > I have a JavaScript code that fetches code lines from another page
> > into a string, but I don't know how to run this code in the page I
[quoted text clipped - 13 lines]
> Martin Honnen
> http://msmvps.com/blogs/martin_honnen/

thanks!

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Gordon - 31 Jul 2009 17:26 GMT

> Hi,
> I have a JavaScript code that fetches code lines from another page
[quoted text clipped - 13 lines]
> Please help,
> Ofir.

You can use eval() to run a string as a piece of JavaScript code. But
please, for the love of fluffy kittens, be extremely careful with
this! The potential for abuse should be obvious, and in addition, eval
()ed code runs more slowly, especially in the newfangled JIT
JavaScript engines that are in vogue at the moment because it can't be
sensibly compiled for future use. You'll also have a hell of a time
debugging a wayward piece of eval()ed code.

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Jorge - 01 Aug 2009 00:54 GMT

> Hi,
> I have a JavaScript code that fetches code lines from another page
[quoted text clipped - 13 lines]
> Please help,
> Ofir.

Use eval() as Martin pointed out, or (new Function(code))(); The
former will -usually- run 'code' in the current context, the latter
will execute it in the context of an anonymous, top-level function :
i.e. it is equivalent to :

<script>
(function () { code })();
</script>

--
Jorge.

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Webmaster Forum / HTML, CSS, Scripts / JavaScript / July 2009

Running code from a string