Recently, while developing a MVVM app, I found a use case for using JavaScript to get the querystring from the current page. In this particular case, the page pulls a page with a search bar, but I want to be able to link to the specific search results without requiring user interaction.

My final solution was found on Stack Overflow

    function getParameterByName(name) {
        name = name.replace(/[\[]/, "\\[").replace(/[\]]/, "\\]");
        var regex = new RegExp("[\\?&]" + name + "=([^&#]*)"),
            results = regex.exec(location.search);
        return results === null ? "" : decodeURIComponent(results[1].replace(/\+/g, " "));
    }

This approach allowed me to get the id parameter elsewhere using

var id = getParameterByName("id");