Using a variable in JS replace method

[masterofzen]

This seems like such an easy one, but I can't seem to figure it out or find any answers. I think I might be doing something wrong besides the obvious.

I'm trying to replace a particular variable with a string (specifically, a line break). I'm trying this:

 
if (flashsrc.indexOf('americancultist.com') == -1) {
     document.getElementById('flashinput').replace(embedTag, '\n');
}
 

Is there an obvious reason this isn't working for me? It's kind of a mess right now, but I'm uploading the whole page anyway if you care to peruse it:

http://www.americancultist.com/videosource2.html

What I'm attempting to do here is strip out embed tags that don't come from a certain domain upon form submission. But I don't need a solution to the larger problem for now -- just wondering why this particular step isn't working.

[mrhoo]

You are trying to use a String method on an object.

[masterofzen]

Oh, that was my mistake -- just an alternative I was trying. I originally had this:

        if (flashsrc.indexOf('americancultist.com') == -1) {
            field1val.replace(embedTag, '\n');
        }
 

But that didn't work, either. When I insert an alert afterwards for the value of field1val, it comes up with the variable embedTag unreplaced.

[masterofzen]

Figured it out:

        if (flashsrc.indexOf('americancultist.com') == -1) {
            field1val = field1val.replace(embedTag, '\n');
            document.getElementById('flashinput').value = field1val;
        }
 

I thought using the replace method would change the string itself, but it doesn't. The string has to be set equal to it.

[beatTheDevil]

I thought using the replace method would change the string itself, but it doesn't. The string has to be set equal to it.

JavaScript strings are immutable : ) (they can never be changed once constructed)