Javascript to get query string value by passing the parameters siteUrl and querystringkey

In this post we will be writing a function to retrieve the query string value by passing the parameters siteUrl and querystringkey using Javascript.

Below is the function:

function getQuerystringForUrl(key,siteUrl) {   

    key = decodeURIComponent(key).replace(/[\[]/, "\\\[").replace(/[\]]/, "\\\]");

    var regexS = "[\\?&]" + key + "=([^&#]*)";

    var regex = new RegExp(regexS);           

    var results = regex.exec(siteUrl);

    if (results == null)

        return;

    else

        return decodeURIComponent(results[1]);

}