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Writing Actions ​

Input Validation ​

Forge I/O methods include basic validation by default:

  • io.input.email checks for a valid email.
  • io.input.number ensures a valid number is provided.

Custom Validation ​

To add custom validation, chain the validate method to an I/O method or io.group and pass in a custom function which processes the input and returns

  • return null if valid
  • return string message if invalid

Tip: Validation functions run on your infrastructure alongside the action logic, so you can access any other code as needed.

INFO

Validation functions can be asynchronous.

Example Usage ​

ts
await io
  .group({
    name: io.input.text("Name"),
    email: io.input.text("Password").validate((email) => {
        if (isPreviousPassword) return "Previously used passwords are not allowed."
    }),
  })
  .validate((data) => {
    if (isInvalidCredentials) return "Invalid credentials."
  });
python
await io.group(
    io.input.text("Username"),
    io.input.text("Password").validate(
        lambda s: "Previously used passwords are not allowed."
        if is_previous_password
        else None
    ),
).validate(
    lambda data: "Invalid credentials"
    if is_invalid_credentials
    else None
)