Getting a number out of the url

This question already has an answer here:

How can I get query string values in JavaScript? 73 answers

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You can make use of split()

var url = 'http://localhost:17241/Chart.aspx?id=11'
var params = url.split('?');
var id=params[1].split('=')[1]; //params[1] will contain everything after ? 
console.log(id);

EDIT

To get the url inside the var url replace the first line with

var url = window.location.href;

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It's called query string

here is the function,

 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, " "));
 }

and how you call

getParameterByName(name)

Above code is from here How can I get query string values in JavaScript?

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If you want it as an actual number I would write a generic version

function getParamAsNumber(url, param) {
    param = param + '=';
    if (url.indexOf(param) !== -1) {
        return parseInt(url.substr(url.indexOf(param) + param.length));
    }
}

It converts to integer the string after param + '=' (in your case 'id=')

So you can do

getParamAsNumber(window.location.href, 'id');

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