How to get Query String parameters from JavaScript

We can easily set up a Javascript function that will retrieve the query string and load an array with the values passed in the query string. Here it is. This function goes into the head section of our page.

var qsParm;

        GetQueryStringParams();

        function GetQueryStringParams() {

            //Holds key:value pairs

            qsParm = new Array();

            //Get querystring from url

            var requestUrl = window.location.search.toString();

            if (requestUrl != '') {

                //window.location.search returns the part of the URL

                //that follows the ? symbol, including the ? symbol

                var query = requestUrl.substring(1);

                //Get key:value pairs from querystring

                var parms = query.split('&');

                for (var i = 0; i < parms.length; i++) {

                    var pos = parms[i].indexOf('=');

                    if (pos > 0) {

                        var key = parms[i].substring(0, pos);

                        var val = parms[i].substring(pos + 1);

                        qsParm[key] = val;

                    }

                }

            }

        }