ionic-docs/static/usage/v8/checkbox/helper-error/demo.html at 2adff211d6f99342c314f440c5159fa46c84bada · ionic-team/ionic-docs · GitHub

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Input</title>
    <link rel="stylesheet" href="../../common.css" />
    <script src="../../common.js"></script>
    <script
      type="module"
      src="https://cdn.jsdelivr.net/npm/@ionic/core@8.4.4-dev.11741206641.18dd4e91/dist/ionic/ionic.esm.js"
    ></script>
    <link
      rel="stylesheet"
      href="https://cdn.jsdelivr.net/npm/@ionic/core@8.4.4-dev.11741206641.18dd4e91/css/ionic.bundle.css"
    />
  </head>

  <body>
    <div class="container">
      <form id="my-form">
        <ion-checkbox helper-text="This needs to be checked" error-text="This field is required">
          I agree to the terms and conditions
        </ion-checkbox>

        <br />

        <ion-button type="submit" size="small">Submit</ion-button>
      </form>
    </div>

    <script>
      const form = document.getElementById('my-form');
      const agree = form.querySelector('ion-checkbox');

      form.addEventListener('submit', (event) => submit(event));
      agree.addEventListener('ionChange', (event) => validateCheckbox(event));

      const validateCheckbox = (event) => {
        agree.classList.add('ion-touched');

        if (!event.detail.checked) {
          agree.classList.add('ion-invalid');
          agree.classList.remove('ion-valid');
        } else {
          agree.classList.remove('ion-invalid');
          agree.classList.add('ion-valid');
        }
      };

      const submit = (event) => {
        event.preventDefault();

        validateCheckbox({ detail: { checked: agree.checked } });
      };
    </script>
  </body>
</html>