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Get URL Parameter by Name - https://stackoverflow.com/a/901144/5627904
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function getParameterByName(name, url) { | |
if (!url) url = window.location.href; | |
name = name.replace(/[\[\]]/g, '\\$&'); | |
var regex = new RegExp('[?&]' + name + '(=([^&#]*)|&|#|$)'), | |
results = regex.exec(url); | |
if (!results) return null; | |
if (!results[2]) return ''; | |
return decodeURIComponent(results[2].replace(/\+/g, ' ')); | |
} | |
// query string: ?foo=lorem&bar=&baz | |
var foo = getParameterByName('foo'); // "lorem" | |
var bar = getParameterByName('bar'); // "" (present with empty value) | |
var baz = getParameterByName('baz'); // "" (present with no value) | |
var qux = getParameterByName('qux'); // null (absent) |
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