A simple method to append to current querystring

AppendToQueryString.js

appendToQueryString = function (param, val) {
    var queryString = window.location.search.replace("?", "");
    var parameterListRaw = queryString === "" ? [] : queryString.split("&");
    var parameterList = {};
    var newQueryString = "?";

    for (var i = 0; i < parameterListRaw.length; i++) {
        var parameter = parameterListRaw[i].split("=");
        parameterList[parameter[0]] = parameter[1];
    }

    for (var param in dict) {
        if (dict.hasOwnProperty(param)) {
            if (dict[param]) {
                parameterList[param] = dict[param];
            } else {
                delete parameterList[param];
            }
        }
    }
    for (var item in parameterList) {
        if (parameterList.hasOwnProperty(item)) {
            newQueryString += item + "=" + parameterList[item] + "&";
        }
    }
    newQueryString = newQueryString.replace(/[?&]$/, "");
    return location.origin + location.pathname + newQueryString;
}