Updating existing URL querystring values with jQuery

Question

Let\'s say I have a url such as:

http://www.example.com/hello.png?w=100&h=100&bg=white

What I\'d like to do is update the values of

Answer 1

//update URL Parameter
function updateURL(key,val){
    var url = window.location.href;
    var reExp = new RegExp("[\?|\&]"+key + "=[0-9a-zA-Z\_\+\-\|\.\,\;]*");

    if(reExp.test(url)) {
        // update
        var reExp = new RegExp("[\?&]" + key + "=([^&#]*)");
        var delimiter = reExp.exec(url)[0].charAt(0);
        url = url.replace(reExp, delimiter + key + "=" + val);
    } else {
        // add
        var newParam = key + "=" + val;
        if(!url.indexOf('?')){url += '?';}

        if(url.indexOf('#') > -1){
            var urlparts = url.split('#');
            url = urlparts[0] +  "&" + newParam +  (urlparts[1] ?  "#" +urlparts[1] : '');
        } else {
            url += "&" + newParam;
        }
    }
    window.history.pushState(null, document.title, url);
}