Handle URL parameters: get, update, buildURL

handleurlparams.js

function getURLParams() {
    var i = 0,
        params = {},
        tmpParam = [],
        pairs = window.location.href
            .slice(window.location.href.indexOf('?') + 1)
            .replace(window.location.hash, '')
            .split('&');

    for(; i < pairs.length; i++) {
        tmpParam = pairs[i].split('=');
        params[tmpParam[0]] = tmpParam[1];
    }

    return params;
}

function updateURLParams( key, val ) {
    var params = getURLParams();

    params[key] = val;

    return params;
}

function buildURLwithParams( params ) {
    var i = 0,
        url = '',
        paramsString = '',
        loc = document.location,
        protocol = loc.protocol,
        host = loc.host,
        pathname = loc.pathname,
        hash = loc.hash;

    for(key in params) {
        if (params.hasOwnProperty(key)) {

            if(i > 0) {
                paramsString += '&';
            }

            paramsString += key + '=' + params[key];

            i++;
        }
    }

    if( paramsString !== '' ) {
        paramsString = '?' + paramsString;
    }

    url = protocol + '//' + host + pathname + paramsString + hash;

    return url;
}