The following JS function is used to get URL parameters:

Example

function getQueryVariable(variable)
{
    var query = window.location.search.substring(1);
    var vars = query.split("&");
    for (var i=0;i<vars.length;i++) {
        var pair = vars[i].split("=");
        if(pair[0] == variable){return pair[1];}
    }
    return(false);
}

Usage Example

url example:

https://www.example.com/index.php?id=1&image=awesome.jpg

CallgetQueryVariable("id")Returns 1.

CallgetQueryVariable("image") Returns "awesome.jpg".