HTML USSD

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Navigation Behavior ​

This page explains how the USSD simulation engine handles user interactions and transitions between screens.

Users select a numeric option (e.g. 1, 2, 3) to navigate between screens.

  • When a link is selected, the simulator fetches the target from the href attribute.
  • The user input (the selected number) is automatically appended to the URL as a query parameter: user_entry=<selected number>

Example

html
<a href="https://html-ussd-example.onrender.com/handle-offre">Offre 1</a>
<a href="https://html-ussd-example.onrender.com/handle-offre">Offre 2</a>

If the user presses 1, the request becomes:

bash
https://html-ussd-example.onrender.com/handle-offre?user_entry=1

Form (<form>) ​

Users are prompted to enter a value (text or number). Forms must include:

  • action → the URL to send the submission to
  • method (get or post) → defaults to get if not specified

Depending on the method, the form data is either:

  • sent as query parameters (GET)
  • or in the body (POST) — with the Content-Type header set to application/x-www-form-urlencoded.

Exit Condition ​

If a screen contains no link (<a>) and no form (<form>), the application exits automatically.

This marks the end of the USSD session.