How to get the name of the current Windows user in JavaScript
JavaScript runs in the context of the current HTML document, so it won't be able to determine anything about a current user unless it's in the current page or you do AJAX calls to a server-side script to get more information.
JavaScript will not be able to determine your Windows user name.
There is no fully compatible alternative in JavaScript as it posses an unsafe security issue to allow client-side code to become aware of the logged in user.
That said, the following code would allow you to get the logged in username, but it will only work on Windows, and only within Internet Explorer, as it makes use of ActiveX. Also Internet Explorer will most likely display a popup alerting you to the potential security problems associated with using this code, which won't exactly help usability.
<!doctype html><html><head> <title>Windows Username</title></head><body><script type="text/javascript"> var WinNetwork = new ActiveXObject("WScript.Network"); alert(WinNetwork.UserName); </script></body></html>As Surreal Dreams suggested you could use AJAX to call a server-side method that serves back the username, or render the HTML with a hidden input with a value of the logged in user, for e.g.
(ASP.NET MVC 3 syntax)
<input id="username" type="hidden" value="@User.Identity.Name" />
If the script is running on Microsoft Windows in an HTA or similar, you can do this:
var wshshell=new ActiveXObject("wscript.shell");var username=wshshell.ExpandEnvironmentStrings("%username%");Otherwise, as others have pointed out, you're out of luck. This is considered to be private information and is not provided by the browser to the javascript engine.