Remove whitespace in JavaScript. Sourced from http://css-tricks.com/snippets/javascript/strip-whitespace-from-string/

example-trim.js

// Remove leading and trailing whitespace
// jQuery $.trim
var str = " a b    c d e f g ";
var newStr = $.trim(str);
$("body").append("<div>" + newStr + "</div>");

// Remove leading and trailing whitespace
// JavaScript RegEx
var str = "   a b    c d e f g ";
var newStr = str.replace(/(^\s+|\s+$)/g,'');
$("body").append("<div>" + newStr + "</div>");

// Remove all whitespace
// JavaScript RegEx
var str = " a b    c d e   f g   ";
var newStr = str.replace(/\s+/g, '');
$("body").append("<div>" + newStr + "</div>");

// Native JavaScript method
// Polyfill it just in case
if (!String.prototype.trim) {
  String.prototype.trim = function () {
    return this.replace(/^\s+|\s+$/g, '');
  };
}
var str = " a b    c d e   f g   ";
var newStr = str.trim();
$("body").append("<div>" + newStr + "</div>");

// None of these work for &#8239; (thin space) or &nbsp; (non-breaking space)

WhitespaceRemover.js

// Vanilla JavaScript - trim Leading and Trailing - ES5 
function TrimVanilla(str){
  return str.trim();
}

// Older browsers - IE8 and before - using Polyfill. Call trim() method after running this.
function TrimPolyfill(){
  if (!String.prototype.trim) {
    String.prototype.trim = function () {
      return this.replace(/^\s+|\s+$/g, '');
  }
}

// jQuery (Trim Leading and Trailing)
function TrimWithjQuery(str){
  return $.trim(str); 
}

// Vanilla JavaScript RegEx (Trim Leading and Trailing)
function TrimWithjQuery(str){
 return str.replace(/(^\s+|\s+$)/g,'');
}


// Vanilla JavaScript RegEx (Trim ALL Whitespace)
function TrimWithjQueryAll(str){
  return str.replace(/\s+/g, '');
}

 The JavaScript code above is presently broken...

// Vanilla JavaScript - trim Leading and Trailing - ES5
function TrimVanilla(str) {
  return str.trim();
}

// Older browsers - IE8 and before - using Polyfill. Call trim() method after running this.
function TrimPolyfill() {
  if (!String.prototype.trim) {
    String.prototype.trim = function () {
      return this.replace(/^\s+|\s+$/g, '');
    };
  }
}

// jQuery (Trim Leading and Trailing)
function TrimWithjQuery(str) {
  return $.trim(str);
}

// Vanilla JavaScript RegEx (Trim Leading and Trailing)
function TrimWithVanilla(str) {
  return str.replace(/(^\s+|\s+$)/g, '');
}

// Vanilla JavaScript RegEx (Trim ALL Whitespace)
function TrimWithVanillaAll(str) {
  return str.replace(/\s+/g, '');
}