Need help redirecting users from login.html before authentication

RouterOS
1

Subject: Need help redirecting users from login.html before authentication (not alogin.html)

Hello everyone,

I'm working on a MikroTik Hotspot (RouterOS) and I need help with a specific customization.

What I want to achieve:

  • When a user enters a voucher code that starts with "0000" (e.g., "0000123") in the login page, they should be redirected to an external page like "winner.html" (or any URL) BEFORE authentication happens.
  • Normal vouchers (not starting with 0000) should proceed with normal login.

What I have tried:
I modified alogin.html and tried using:
$(if username:startswith("0000"))window.location.href="winner.html"$(else)...

The problem:

  • alogin.html only appears AFTER the user is already logged in.
  • The redirect works but the user is already authenticated, which is too late.
  • I cannot get any conditional logic to work inside alogin.html before the login completes.

What I need:

  • A working example of how to check the username INSIDE login.html (not alogin.html) before sending the credentials to the router.
  • The logic should intercept the form submission, check if the username starts with "0000", and if true, redirect to an external page without attempting to log in.

I understand that login.html is the actual login page shown to users, and alogin.html is shown after successful login. So the condition should be in login.html, not alogin.html.

Can someone provide a working code example for login.html that accomplishes this?

Thank you in advance!

2

Add the redirect logic on login.html not alogin.html, and capture it on the form submit event.

Depending on what you want the redirected page to do, you might need to pass the values in to your new script and re-submit them transparently to alogin.html to complete the authentication process.