Source: public/src/util/addUrlParam.js

/**
 * Add a URL parameter (or changing it if it already exists)
 * 
 * @param {string} url The url
 * @param {string} parameterName The parameter name
 * @param {string} parameterValue The parameter value
 * @param {boolean} [atStart] Add param before others
 * @returns {string} URL
 * @see http://stackoverflow.com/questions/486896/adding-a-parameter-to-the-url-with-javascript
 * @see http://stackoverflow.com/questions/6953944/how-to-add-parameters-to-a-url-that-already-contains-other-parameters-and-maybe?noredirect=1&lq=1
 * @module util/addUrlParam
 */
export default function addUrlParam(url, parameterName, parameterValue, atStart){
    var replaceDuplicates = true, urlhash, sourceUrl;
    if(url.indexOf('#') > 0){
        var cl = url.indexOf('#');
        urlhash = url.substring(url.indexOf('#'),url.length);
    } else {
        urlhash = '';
        cl = url.length;
    }
    sourceUrl = url.substring(0,cl);

    var urlParts = sourceUrl.split("?");
    var newQueryString = "";

    if (urlParts.length > 1)
    {
        var parameters = urlParts[1].split("&");
        for (var i=0; (i < parameters.length); i++)
        {
            var parameterParts = parameters[i].split("=");
            if (!(replaceDuplicates && parameterParts[0] == parameterName))
            {
                if (newQueryString == "")
                    newQueryString = "?";
                else
                    newQueryString += "&";
                newQueryString += parameterParts[0] + "=" + (parameterParts[1]?parameterParts[1]:'');
            }
        }
    }
    if (newQueryString == "")
        newQueryString = "?";

    if(atStart){
        newQueryString = '?'+ parameterName + "=" + parameterValue + (newQueryString.length>1?'&'+newQueryString.substring(1):'');
    } else {
        if (newQueryString !== "" && newQueryString != '?')
            newQueryString += "&";
        newQueryString += parameterName + "=" + (parameterValue?parameterValue:'');
    }
    return urlParts[0] + newQueryString + urlhash;
}