Add selection examples to dropdown

docs/components/dropdown.md

@@ -121,4 +121,57 @@ Dropdown panels will be clipped if they're inside a container that has `overflow
 </style>
 ```
 
+### Getting the Selected Item
+
+When dropdowns are used with [menus](/components/menu.md), you can listen for the `slSelect` event to determine which menu item was selected. The menu item element will be exposed in `event.detail.item`. You can set `value` props to make it easier to identify commands.
+
+```html preview
+<div class="dropdown-selection">
+  <sl-dropdown>
+    <sl-button slot="trigger" caret>Edit</sl-button>
+    <sl-menu>
+      <sl-menu-item value="cut">Cut</sl-menu-item>
+      <sl-menu-item value="copy">Copy</sl-menu-item>
+      <sl-menu-item value="paste">Paste</sl-menu-item>
+    </sl-menu>
+  </sl-dropdown>
+</div>
+
+<script>
+  const container = document.querySelector('.dropdown-selection');
+  const dropdown = container.querySelector('sl-dropdown');
+
+  dropdown.addEventListener('slSelect', event => {
+    const selectedItem = event.detail.item;
+    console.log(selectedItem.value);
+  });
+</script>
+```
+
+Alternatively, you can listen for the `click` event on individual menu items. Note that, using this approach, disabled menu items will still emit a `click` event.
+
+```html preview
+<div class="dropdown-selection-alt">
+  <sl-dropdown>
+    <sl-button slot="trigger" caret>Edit</sl-button>
+    <sl-menu>
+      <sl-menu-item value="cut">Cut</sl-menu-item>
+      <sl-menu-item value="copy">Copy</sl-menu-item>
+      <sl-menu-item value="paste">Paste</sl-menu-item>
+    </sl-menu>
+  </sl-dropdown>
+</div>
+
+<script>
+  const container = document.querySelector('.dropdown-selection-alt');
+  const cut = container.querySelector('sl-menu-item[value="cut"]');
+  const copy = container.querySelector('sl-menu-item[value="copy"]');
+  const paste = container.querySelector('sl-menu-item[value="paste"]');
+
+  cut.addEventListener('click', () => console.log('cut'));
+  copy.addEventListener('click', () => console.log('copy'));
+  paste.addEventListener('click', () => console.log('paste'));
+</script>
+```
+
 [component-metadata:sl-dropdown]