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How to access Query String Values using Javascript?

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Ayyaz Zafarhttps://www.ayyaztech.com
I am Full Stack Web Developer with 10 years of professional Experience. I have following Skills: HTML5, CSS3, Javascript, jQuery, Ajax, PHP, MySQL, jQuery, Angular, React.js, Wordpress, Codeigniter, Laravel, Node.js, Mongo DB, Express.js, GraphQL, Typescript, Apollo and many more..

Following function is very useful to easily access url paramters ( query string values).

function getParameterByName(name, url) {
    if (!url) url = window.location.href;
    name = name.replace(/[\[\]]/g, "\\$&");
    var regex = new RegExp("[?&]" + name + "(=([^&#]*)|&|#|$)"),
        results = regex.exec(url);
    if (!results) return null;
    if (!results[2]) return '';
    return decodeURIComponent(results[2].replace(/\+/g, " "));
}


// USAGE
// query string: ?foo=lorem&bar=&baz
var foo = getParameterByName('foo'); // "lorem"
var bar = getParameterByName('bar'); // "" (present with empty value)
var baz = getParameterByName('baz'); // "" (present with no value)
var qux = getParameterByName('qux'); // null (absent)

Source: http://stackoverflow.com/questions/901115/how-can-i-get-query-string-values-in-javascript

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