CHUVASH.eu

There is a question in Stackoverflow and this one, too. There is a fine solution for jQuery. The only thing we need is window.location.search. Say we have http://domain.com?q=hello&a=good#home, then it takes only ?q=hello&a=good, and leaves #home and the main url. Anchors can be retrieved with hash. Here are all properties of window.location:

Google Chrome provides a fine function: window.location.getParameter:

I like the name of this function. So why not to use it or create this one if a browser doesn’t have it? Well here we go:

if (!window.location.getParameter ) {
  window.location.getParameter = function() {};
}

Then I don’t want it to be depending on jQuery, eventhough the odds are big, that jQuery is there. But in all solutions I have seen, there is no usage of jQuery, so why do it as a jQuery extension?

However, we must extract the search part of window.location… I’ll use the solution of Ryan Phelan, but without jQuery (again, why extend jQuery without any usage of it?):

if (!window.location.getParameter ) {
  window.location.getParameter = function(key) {
	function parseParams() {
		var params = {},
			e,
			a = /\+/g,  // Regex for replacing addition symbol with a space
			r = /([^&=]+)=?([^&]*)/g,
			d = function (s) { return decodeURIComponent(s.replace(a, " ")); },
			q = window.location.search.substring(1);

		while (e = r.exec(q))
			params[d(e[1])] = d(e[2]);

		return params;
	}

	if (!this.queryStringParams)
		this.queryStringParams = parseParams(); 

	return this.queryStringParams[key];
  };
}

I published this solution on Stackoverflow.

For us Sharepointers

In SharePoint there is actually a built-in javascript function which retrieves the url query parameters: _spGetQueryParam which can be found in init.js:

function _spGetQueryParam(p)
{ULSA13:;
	var q=window.location.search.substring(1);
	if(q && q.length > 2)
	{
		var params=q.split("&");
		var l=params.length;
		for (var i=0;i<l;i++)
		{
			var pair=params[i].split("=");
			if (pair[0].toLowerCase()==p)
				return pair[1];
		}
	}
}

As I posted in an answer on sharepoint.stackexchange.com it can be used like this:

var id = _spGetQueryParam("ID");
var url = "/Forms/AllItems.aspx?FilterField1=look&FilterValue1=" + id;