Entry

How can I trim (remove leading and trainling withespace from) a string?

how to remove spaces in javascript

May 12th, 2008 20:34
i can do it, Taksh Verdhan, Martin Honnen, Vijay Solanki,

Use regular expressions to remove the white space 
function trimString (str) {
  str = this != window? this : str;
  return str.replace(/^\s+/g, '').replace(/\s+$/g, '');
}
Then you can call
var s = '  Kibo  ';
s = trimString(s);
alert(s.length);
The above function is set up so that it can be added as a method to the 
String.prototype:
function trimString (str) {
  str = this != window? this : str;
  return str.replace(/^\s+/g, '').replace(/\s+$/g, '');
}
String.prototype.trim = trimString;
which you can then call as follows:
var s = '  Kibo  ';
s = s.trim();
alert(s.length);
Decide for yourself which way you find more elegant. 
Note that this whole solution using regular expressions is JavaScript 
1.2 so will not work with version pre 4 browsers.
So here is a function for NN2 and NN3 and IE3 which removes leading and 
trailing spaces from a string:
function trimString (str) {
  while (str.charAt(0) == ' ')
    str = str.substring(1);
  while (str.charAt(str.length - 1) == ' ')
    str = str.substring(0, str.length - 1);
  return str;
}
//Example
var s = '  Kibo   ';
s = trimString(s);
alert(s.length)
Note that contrary to the regular expression version only spaces but 
not all whitespace (e.g. tabs linefeeds) are removed but you could 
adapt the function to do that as well.
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