Advanced

Async / Remote Validation

Validate against a server endpoint — check username availability, email uniqueness, and more.

How It Works

Async validation sends the field value to a remote URL and checks the response. A loading spinner is shown while waiting. The response must be JSON with a valid boolean.

Attributes

data-ev-remote — Endpoint URL
data-ev-remote-method — GET or POST (default: POST)
data-ev-remote-debounce — Debounce delay in ms
data-ev-msg-remote — Custom error message

Code Example

<input type="text"
  data-ev-type="username"
  data-ev-remote="/api/check-username"
  data-ev-remote-method="GET"
  data-ev-remote-debounce="500"
  data-ev-msg-remote="Username is taken" />

Expected Response

{ "valid": true }
// or
{ "valid": false,
  "message": "Username taken" }

Demo Note: This demo uses simulated async validation (client-side setTimeout). In production, use real API endpoints.