Query string values in JavaScript

In this quick code you will learn how to get query string (browser address bar's variable) values using JavaScript.

To do such tasks and JavaScript itself enough to make your job done. Let's try out how this works.

<script>

    (function () {

        // we can call getQueryStringByName from anywhere we want

        var result = getQueryStringByName('id');

        alert(result);

    })();

    function getQueryStringByName(name) {

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

        var regex = new RegExp("[\\?&]" + name + "=([^&#]*)"),

            results = regex.exec(location.search);

        return results === null ? "" : decodeURIComponent(results[1].replace(/\+/g, " "));

    }

</script>

If you run above code and URL contains 'id' as query string, then its values will be alerted, here is screenshot.

Hope this helps.