Mutation Observer

<div class="mutation-overview">
  <wa-mutation-observer attr="variant">
    <wa-button appearance="filled" variant="brand">Click to mutate</wa-button>
  </wa-mutation-observer>

  <br />
  👆 Click the button and watch the console

  <script>
    const container = document.querySelector('.mutation-overview');
    const mutationObserver = container.querySelector('wa-mutation-observer');
    const button = container.querySelector('wa-button');
    const variants = ['brand', 'success', 'neutral', 'warning', 'danger'];
    let clicks = 0;

    // Change the button's variant attribute
    button.addEventListener('click', () => {
      clicks++;
      button.setAttribute('variant', variants[clicks % variants.length]);
    });

    // Log mutations
    mutationObserver.addEventListener('wa-mutation', event => {
      console.log(event.detail);
    });
  </script>

  <style>
    .mutation-overview wa-button {
      margin-bottom: 1rem;
    }
  </style>
</div>

<div class="mutation-child-list">
  <wa-mutation-observer child-list>
    <div class="buttons">
      <wa-button appearance="filled" variant="brand">Add button</wa-button>
    </div>
  </wa-mutation-observer>

  👆 Add and remove buttons and watch the console

  <script>
    const container = document.querySelector('.mutation-child-list');
    const mutationObserver = container.querySelector('wa-mutation-observer');
    const buttons = container.querySelector('.buttons');
    const button = container.querySelector('wa-button[variant="brand"]');
    let i = 0;

    // Add a button
    button.addEventListener('click', () => {
      const button = document.createElement('wa-button');
      button.textContent = ++i;
      buttons.append(button);
    });

    // Remove a button
    buttons.addEventListener('click', event => {
      const target = event.target.closest('wa-button:not([variant="brand"])');
      event.stopPropagation();

      if (target) {
        target.remove();
      }
    });

    // Log mutations
    mutationObserver.addEventListener('wa-mutation', event => {
      console.log(event.detail);
    });
  </script>

  <style>
    .mutation-child-list .buttons {
      display: flex;
      gap: 0.25rem;
      flex-wrap: wrap;
      margin-bottom: 1rem;
    }
  </style>
</div>