Why string replace fails?

D

Don Li

Hi,

The blank.html reads:
<html><body bgcolor="#FFFFFF"></body></html>

// function
var str = new String();
str.replace('<html><body bgcolor="#FFFFFF"></body></
html>','<html><head><title></title></head><body
bgcolor=##FFFFFF><p>Hello 1</p></body></html>');
document.location = 'blank.html';

Thanks.

P.S.
If I use a new Object instead of String, but then we don't have the
{replace} method.
 
T

Thomas 'PointedEars' Lahn

Don said:
The blank.html reads:
<html><body bgcolor="#FFFFFF"></body></html>

// function
var str = new String();
str.replace('<html><body bgcolor="#FFFFFF"></body></
html>','<html><head><title></title></head><body
bgcolor=##FFFFFF><p>Hello 1</p></body></html>');
document.location = 'blank.html';
Click to expand...

To answer your question: because you are using fantasy syntax, to say the
least. The String.prototype.replace() method requires two arguments, the
first being the substring or Regular Expression to match, and the second
being the replacement string or a reference to a Function object that
returns it.

Since

var str = new String();

is roughly equivalent to

var str = "";

with

str.replace('...', '...');

there is never a match.

Maybe you were looking for

document.documentElement.innerHTML =
document.documentElement.innerHTML.replace(...);

but that is awfully bad style, not least because the markup is invalid.
You want to append a `p' element instead:

var p = document.createElement("p");
var txt = document.createTextNode("Hello 1");
p.appendChild(txt);
document.body.appendChild(p);

Your document.location assignment does not make any sense either because, if
it even works, it overwrites the changes you did before. RTFM.
P.S.
If I use a new Object instead of String, but then we don't have the
{replace} method.
Click to expand...

You don't say.


PointedEars
 

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