• websites

amp-bind-recaptcha

Introduction

This example shows how to create recaptcha input using just amp-bind.

Import amp-bind so recaptcha can have multiple states

<script async custom-element="amp-bind" src="https://cdn.ampproject.org/v0/amp-bind-0.1.js"></script>

Recaptcha input used to verify user for amp-form

<script async custom-element="amp-form" src="https://cdn.ampproject.org/v0/amp-form-0.1.js"></script>

Implementation

The amp-state below defines three different states that the recaptcha equation could be.

<amp-state id="captcha">
  <script type="application/json">
    {
       "state1": {
             "result": "10",
             "condition": "+",
             "captchaCorrect": "6"

       },
       "state2": {
             "result": "2",
             "condition": "-",
             "captchaCorrect": "6"
       },
       "state3": {
             "result": "8",
             "condition": "*",
             "captchaCorrect": "2"
       }
     }
  </script>
</amp-state>

Form

Recaptcha forces users to provide the correct input using the [pattern] requirement. The [pattern] updates dynamically as the state changes. In order for the recaptcha to work on first pass, disable the input until the amp-bind 'state' variable is set (i.e. [disabled]="!state"). As another workaround, you could set a default pattern (without brackets) and have the [pattern] update as user refreshes the conditional. Upon refresh the 'state' is updated to provide a new equation.