Introduced in JavaScript 1.8.1

Summary

Removes whitespace from both ends of the string.

Syntax

string.trim()

Parameters

None.

Description

The trim method returns the string stripped of whitespace from both ends. trim does not affect the value of the string itself.

Examples

var orig = "   foo  ";
alert(orig.trim());

See Also

• trimLeft()
• trimRight()

Compatibility

Running the following code before any other code will create String.trim if it's not natively available.

if(!String.prototype.trim) {
  String.prototype.trim = function () {
    return this.replace(/^\s+|\s+$/g,'');
  };
}

Browser compatibility

Based on Kangax's compat tables