A/B Test Helper Functions

gistfile1.txt

// Get URL Parameter
function getQueryVariable(variable) {
	var query = window.location.search.substring(1);
	var vars = query.split("&");
	for (var i=0;i<vars.length;i++) {
		var pair = vars[i].split("=");
		if(pair[0] == variable){return pair[1];}
	}
	return(false);
}

// Set random number
function setABVar( variation_count ) {

	var varID = Math.floor( Math.random() * variation_count );
	return varID;
}

function chooseVariation( experimentID, variations, param ) {

	if ( typeof cxApi === 'undefined' ) {
		return 0;
	}

	var chosenVariation = cxApi.getChosenVariation( experimentID );

	if ( chosenVariation < 0 ) {

		cxApi.setChosenVariation( setABVar( variations ) , experimentID );
		chosenVariation = cxApi.getChosenVariation( experimentID );
	}

	if ( getQueryVariable( param ).length > 0 ) {
		chosenVariation = parseInt( getQueryVariable( param ) );
	}

	return chosenVariation;
}