Reading and removing a get param from a URL

clearparam.js

/**
 * Clear a specific get param from a url and replace it in window history
 */
function clearParam(param) {
    // Get the querystring as a hash
    var params = window.queryParams();
    // Remove the param
    delete params[param];
    // Quickest way to remove the whole querystring, which is fine because we're rebuidling it anyway
    var href = window.location.href.split("?")[0];
    // Don't save the original get param to history
    window.history.replaceState(null, null, href + serialize(queryParams));
}

serialize.js

/**
 * Given a hash (even a multi-level hash), return a http querystring
 */
serialize = function(obj, prefix) {
    var str = [];
    for (var p in obj) {
        if (obj.hasOwnProperty(p)) {
            var k = prefix ? prefix + "[" + p + "]" : p,
                v = obj[p];
            str.push(typeof v == "object" ? serialize(v, k) :
                encodeURIComponent(k) + "=" + encodeURIComponent(v));
        }
    }
    return str.join("&");
}

window.queryparams.js

/**
 * Takes the query params of the url or a passed querystring and returns a hash
 */
window.queryParams = function(str) {
    return (str || document.location.search).replace(/(^\?)/,'').split("&").map(function(n){return n=n.split("="),this[n[0]]=n[1],this;}.bind({}))[0];
};