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How can JavaScript make new page that contains more JavaScript?

Answer 1

A:

EDIT: as others pointed out, you should escape the slash with a backslash.

The easy (but non standard) solution is to break your string:

opened.document.write("</scr"+"ipt>");

Jerome 2010-01-05 09:14:34

This approach depends on browsers performing error recovery and should be avoided. It is invalid HTML. http://bit.ly/5dN2dv

David Dorward 2010-01-05 09:21:58

I didn't know that, you learn something new everyday :) The FAQ you linked to is interesting.

Jerome 2010-01-05 09:25:59

Answer 2

+7 A:

This sounds like you are embedding the JS into an HTML document rather than using an external file, and that you are serving it as text/html. (If it was XHTML then you would get a simple well-formedness error).

You could move the code to an external file (which is the simplest option), or you can escape the slash characters on anything that looks like an end tag:

document.write("<\/script>");

Note you should do this to all end tags (not just </script>) due to the way SGML works (even if most browsers don't completely respect the rules of SGML).

There is a good FAQ entry on this subject.

David Dorward 2010-01-05 09:16:45

Have you seen this yet: http://stackoverflow.com/questions/1985385/script-inside-javascript-code-document-write ? Moving the script to an external file may cause IE to hang with *document.write*? Curious...

Crescent Fresh 2010-01-05 09:35:09

Answer 3

+5 A:

If you do not fancy splitting the string, you can also use the escape charachter:

opened.document.write("<\/script>");

Daniel Vassallo 2010-01-05 09:17:05

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How can JavaScript make new page that contains more JavaScript?

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