RegionPicker

VRegionPicker is a controlled hierarchical selector. It owns level navigation, shortcuts, disabled state, confirmation, and async root/child loading feedback; API implementation, caching policy, authorization, and coordinate resolution stay in application code.

Demo

Usage

<script setup lang="ts">
import { shallowRef } from 'wevu'
import { VRegionPicker } from '@/components/ui/region-picker'

const visible = shallowRef(false)
const path = shallowRef([])
const options = [
  {
    label: 'Zhejiang',
    value: 'zhejiang',
    children: [
      { label: 'Hangzhou', value: 'hangzhou', latitude: 30.274, longitude: 120.155 }
    ]
  }
]
</script>

<template>
  <VRegionPicker
    v-model="path"
    v-model:visible="visible"
    :options="options"
    @confirm="saveRegion"
  />
</template>

Dynamic API loading

options may start empty. Opening the panel calls loadChildren({ path: [], level: 0 }); selecting an unloaded node marked with hasChildren: true requests the next level with the complete path.

<script setup lang="ts">
import type { VaroRegionLoadContext } from '@/components/ui/region-picker.types'

async function loadChildren(context: VaroRegionLoadContext) {
  const parent = context.option?.value ?? 'root'
  const response = await regionApi.list({ parent, path: context.path })
  return response.items
}
</script>

<template>
  <VRegionPicker
    v-model="path"
    v-model:visible="visible"
    :load-children="loadChildren"
    :options="[]"
    error-text="Region service is temporarily unavailable"
    retry-text="Try again"
    @load-error="reportRegionFailure"
  />
</template>

The list exposes aria-busy while loading. On failure it retains the current breadcrumbs and renders a retry action. Children returned by the current component instance stay cached, so loaded nodes are not requested again.

Props

Prop	Type	Default	Description
visible	boolean	false	Visibility
modelValue	RegionValue[]	[]	Selected path
options	VaroRegionOption[]	[]	Region tree
shortcuts	VaroRegionShortcut[]	[]	Shortcut paths
title	string	'选择地区'	Dialog title
placeholder	string	'请选择'	Empty level label
loading	boolean	false	Loading state
loadChildren	VaroRegionLoader	undefined	Loads root options or children for the selected node
errorText	string	'地区加载失败'	Loading error copy
retryText	string	'重试'	Retry action copy
allowIntermediate	boolean	false	Allow confirming a branch
confirmOnLeaf	boolean	false	Confirm immediately on a leaf

Events

Event	Payload	Description
update:modelValue	RegionValue[]	Update path
update:visible	boolean	Update visibility
change	VaroRegionSelection	Draft path changed
confirm	VaroRegionSelection	Confirmed labels and optional coordinates
close	void	Closed
loadStart	VaroRegionLoadContext	Root or child loading started
loadSuccess	VaroRegionLoadSuccess	Loading completed with returned options
loadError	VaroRegionLoadFailure	Loading failed with the original error