Checking GET variables in the URL with JS/jQuery?

Question

If I have a url https://stackoverflow.com/?variable=12345 how can I check if there is a GET parameter in the URL and what it is equals to in JS or jQuery?

For example in PHP:

if(isset($_GET['variable']))
   $variable = $_GET['variable'];

Thanks.

Answer 1

function get_var(var_name){
       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] == var_name){return pair[1];}
       }
       return(false);
}

And to use:

var get_variable = get_var("variable");
if (get_variable !== '') {

  // Variable exists

}