How to trim strings

ajit · June 20th, 2006, 08:23 AM

In Javascript what is the function for trimming the string. trim() did not work.

Ajit

vinod_yadav1919 · June 20th, 2006, 08:37 AM

Hi Ajit!!
function ltrim(str)
{
return str.replace(/^[ ]+/, '');
}

function rtrim(str)
{
return str.replace(/[ ]+$/, '');
}

function trim(str)
{
return ltrim(rtrim(str));
}

hope this will help you

Cheers :)

vinod

joefawcett · June 20th, 2006, 09:27 AM

If you add these three lines of script before you need the functions then you can use lTrim, rTrim and trim functions:

Code:

String.prototype.lTrim = function(){return this.replace(/^\s*/g,"");}
String.prototype.rTrim = function(){return this.replace(/\s*$/g,"");}
String.prototype.trim = function(){return this.lTrim().rTrim();}

Examples:

Code:

var s = "    Using trim functions    ";
alert("lTrim: !" + s.lTrim() + "!");
alert("rTrim: !" + s.rTrim() + "!");
alert("trim: !" + s.trim() + "!");

--

Joe (Microsoft MVP - XML)

ajit · June 20th, 2006, 10:05 AM

Hi Joe, it worked. But i could'nt understand the concept. These spacial characters are used without double codes. They mean something. If U have time, can U plz tel me abt these the way these spacial characters are used in javascript. Here they are used to ignore the spaces(trim())

Ajit

joefawcett · June 20th, 2006, 10:30 AM

You need to search for regular expressions.

--

Joe (Microsoft MVP - XML)