How to Retrieve \"GET\" Request Parameters in JavaScript?

Retrieving "GET" Request Parameters in JavaScript

In JavaScript, obtaining "GET" request parameters requires some processing to extract the data. While neither jQuery nor YUI! provide built-in functionality for this, you can utilize the following approaches:

Updated June 2021:

Modern browsers offer built-in APIs for manipulating URLs (URL) and query strings (URLSearchParams). These APIs should be favored unless supporting legacy browsers or Opera mini is a requirement.

Original Approach:

The "GET" request data resides within window.location.search. To access this data, parse the string using a regular expression:

<code class="javascript">function get(name) {
  if (name = (new RegExp('[?&]' + encodeURIComponent(name) + '=([^&]*)')).exec(location.search))
    return decodeURIComponent(name[1]);
}</code>

To retrieve a GET variable, simply invoke the get() function with the variable's name as a parameter:

<code class="javascript">get('foo'); // returns variable value or undefined</code>

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