how to use trim() in javascript

[aswath]

i used the below code for trimming..

  var str = "    blah blah   ";
                        var trimmed = str.replace(/^\s+|\s+$/g, '') ;                        
                        alert(trimmed);
                        alert(trimmed.value.length);

its aint working.. i think small error..
can any1 retify..
thanks in advance..

[aswath]

i used the bolow example.. none of it is worinking for trimming white spaces

                       var a = String.trim("        Visit W3Schools ");
                        alert(a)
 
 
                        var sMyVar = new String (" testing trim ");
                        alert(sMyVar.trim());
 
 
                        var str = "    blah blah   ";
                        var trimmed = str.replace(/^\s+|\s+$/g, '') ;                        
                        alert(trimmed);
                        alert(trimmed.value.length);
                        q=str.trim();
                        alert(q);
                        alert("'" + str.trim() + "'");

all my need is to take off white spaces before and after a string but not inbetween a string.. ie.,
'' babe babe " should be ''babe babe"......

any help..
thanks in advance..
regards.
aswath.n.s
(knowledge is power)

[gits]

it works - just use:

alert(trimmed.length);

kind regards

[gits]

threads merged - since they cover the same topic ... please don't multipost the same questions ...

kind regards

[acoder]

Just a note that JavaScript strings don't have a trim() method, though you can add it using String.prototype.

[mrhoo]

this method removes leading and trailing whitespace from a string.
The second replace replaces multiple consecutive spaces (but not tabs or newlines) with single spaces-
take it out if you don't want that behavior.

String.prototype.clean:function(){
    var str= this.replace(/(^\s+)|(\s+$)/g,'');
    return str.replace(/ {2,}/g,' ');
}