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

I like Ali's answer the best. I cleaned up the code into a function and thought I would share it to make someone else's life easier. Hope this helps someone.

function addParam(currentUrl,key,val) {
    var url = new URL(currentUrl);
    url.searchParams.set(key, val);
    return url.href; 
}

Answer 2

Another way you you can do this, using some simple reg ex code by Samuel Santos here like this:

/*
 * queryParameters -> handles the query string parameters
 * queryString -> the query string without the fist '?' character
 * re -> the regular expression
 * m -> holds the string matching the regular expression
 */
var queryParameters = {}, queryString = location.search.substring(1),
        re = /([^&=]+)=([^&]*)/g, m;

// Creates a map with the query string parameters
while (m = re.exec(queryString)) {
    queryParameters[decodeURIComponent(m[1])] = decodeURIComponent(m[2]);
}

// Update w and h
queryParameters['w'] = 200;
queryParameters['h'] = 200;

Now you can either create a new URL:

var url = window.location.protocol + '//' + window.location.hostname + window.location.pathname;

// Build new Query String
var params = $.param(queryParameters);
if (params != '') {
    url = url + '?' + params;
}

OR you could just use the params to cause browser to reload right away:

location.search = params;

OR do whatever you want with :)

Answer 3

You could do something like this:

// If key exists updates the value
if (location.href.indexOf('key=') > -1) {
    location.href = location.href.replace('key=current_val', 'key=new_val');

// If not, append
} else {
     location.href = location.href + '&key=new_val';
}

Regards