feat(Tabs): control selected index (#490)

docs/components/content/examples/TabsExampleVModel.vue

@@ -0,0 +1,34 @@
+<script setup>
+const items = [{
+  label: 'Tab1',
+  content: 'This is the content shown for Tab1'
+}, {
+  label: 'Tab2',
+  content: 'And, this is the content for Tab2'
+}, {
+  label: 'Tab3',
+  content: 'Finally, this is the content for Tab3'
+}]
+
+const route = useRoute()
+const router = useRouter()
+
+const selected = computed({
+  get () {
+    const index = items.findIndex((item) => item.label === route.query.tab)
+    if (index === -1) {
+      return 0
+    }
+
+    return index
+  },
+  set (value) {
+    // Hash is specified here to prevent the page from scrolling to the top
+    router.replace({ query: { tab: items[value].label }, hash: '#control-the-selected-index' })
+  }
+})
+</script>
+
+<template>
+  <UTabs v-model="selected" :items="items" />
+</template>