Info

getParameterByName3 would bork if other variables on the query string ended in the same text as the name of the one to return, as pointed out by a comment on SO.

Preparation code

<script>
  var query = "?pdq=wrong+search+value&q=my+search+query&value=55";

  window.GetQueryString = function(q) {
    return (function(a) {
      if (a == "") return {};
      var b = {};
      for (var i = 0; i < a.length; ++i) {
        var p = a[i].split('=');
        if (p.length != 2) continue;
        b[p[0]] = decodeURIComponent(p[1].replace(/\+/g, " "));
      }
      return b;
    })(q.split("&"));
  };

  window.getParameterByName = function(name) {
    name = name.replace(/[\[]/, "\\\[").replace(/[\]]/, "\\\]");
    var regexS = "[\\?&]" + name + "=([^&#]*)";
    var regex = new RegExp(regexS);
    var results = regex.exec(window.location.href);
    if (results == null) return "";
    else return decodeURIComponent(results[1].replace(/\+/g, " "));
  }

  window.getParameterByName2 = function(name) {
    var match = RegExp('[?&]' + name + '=([^&]*)').exec(window.location.search);
    return match && decodeURIComponent(match[1].replace(/\+/g, ' '));
  }

  window.getParameterByName3 = function(n){
      var half = location.search.split(n+'=')[1];
      return half? decodeURIComponent(half.split('&')[0]):null;
  }

  window.getParameterByName4 = function(n){
    var half = location.search.split('&'+n+'=')[1];
    if (!half) half = location.search.split('?'+n+'=')[1];
    return half? decodeURIComponent(half.split('&')[0]):null;
  }
</script>

Test runner

Warning! For accurate results, please disable Firebug before running the tests. (Why?)

Java applet disabled.

var qs = window.GetQueryString(query);

var search = qs["q"];
var value = qs["value"];
var undef = qs["undefinedstring"];

var search = window.getParameterByName("q");
var value = window.getParameterByName("value");
var undef = window.getParameterByName("undefinedstring");

var search = window.getParameterByName2("q");
var value = window.getParameterByName2("value");
var undef = window.getParameterByName2("undefinedstring");

var search = window.getParameterByName3("q");
var value = window.getParameterByName3("value");
var undef = window.getParameterByName3("undefinedstring");

var search = window.getParameterByName4("q");
var value = window.getParameterByName4("value");
var undef = window.getParameterByName4("undefinedstring");

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Revisions

You can edit these tests or add even more tests to this page by appending /edit to the URL. Here’s a list of current revisions for this page:

• Revision 1: published by BrunoLM on 23rd April 2011
• Revision 2: published by Andrew Petersen on 25th April 2011
• Revision 3: published by Andy E on 4th October 2011
• Revision 4: published on 18th January 2012
• Revision 5: published on 27th January 2012
• Revision 8: published by Justin on 14th August 2012
• Revision 9: published by Martin on 3rd September 2012
• Revision 10: published by rufwork on 21st November 2012
• Revision 12: published by amin on 3rd March 2013

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