ionic-docs/static/usage/v8/select/helper-error/demo.html at b3a66404a8d90e7bf34aa4e772c6538a46fc0e21 · 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.11741289071.1e8e1c3f/dist/ionic/ionic.esm.js"
    ></script>
    <link
      rel="stylesheet"
      href="https://cdn.jsdelivr.net/npm/@ionic/core@8.4.4-dev.11741289071.1e8e1c3f/css/ionic.bundle.css"
    />
  </head>

  <body>
    <div class="container">
      <form id="my-form">
        <ion-select
          label="Default label"
          placeholder="Favorite Fruit"
          helper-text="Select your favorite fruit"
          error-text="This field is required"
        >
          <ion-select-option value="apple">Apple</ion-select-option>
          <ion-select-option value="banana">Banana</ion-select-option>
          <ion-select-option value="orange">Orange</ion-select-option>
        </ion-select>

        <br />

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

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

      form.addEventListener('submit', (event) => submit(event));
      favFruit.addEventListener('ionChange', (event) => validateSelect(event));
      favFruit.addEventListener('ionBlur', () => onIonBlur({ detail: { value: favFruit.value } }));

      const validateSelect = (event) => {
        if (!event.detail.value) {
          favFruit.classList.add('ion-invalid');
          favFruit.classList.remove('ion-valid');
        } else {
          favFruit.classList.remove('ion-invalid');
          favFruit.classList.add('ion-valid');
        }
      };

      const markTouched = () => {
        favFruit.classList.add('ion-touched');
      };

      const onIonBlur = (event) => {
        markTouched();
        validateSelect(event);
      };

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

        markTouched();
        validateSelect({ detail: { value: favFruit.value } });
      };
    </script>
  </body>
</html>