Function for forwarding query parameters for the purpose of analytics and attribution tracking.

prependParams.js

function prependParams(){
	var params = document.location.search;
	if(!params) return;

	params = params + '&';

	var nodeList = document.getElementsByTagName('a');
	var anchors = Array.prototype.slice.call(nodeList);
	var l = anchors.length;
	var q = /\?/;

	while(l--){
		var anchor = anchors[l];
		var href = anchor.href;
		var match = q.exec(anchor.href);

		if(!match){
			match = {index: href.length};
		}

		anchor.href = href.slice(0, match.index) + params + href.slice(match.index + 1);
	}
}