<template>
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<el-tree-select
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class="gd-select"
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popper-class="gd-tree-select-popper"
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:model-value="modelValue"
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@update:model-value="handleChange"
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node-key="id"
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:default-expanded-keys="expandedKeys"
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:props="treeSelectProps"
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:placeholder="placeholder"
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:clearable="clearable"
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:filterable="filterable"
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:check-strictly="checkStrictly"
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lazy
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:load="loadRegionNode"
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:render-after-expand="false"
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/>
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</template>
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<script setup>
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import { ref, watch, onMounted } from 'vue'
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import request from '@/axios'
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// 懒加载获取区域节点数据
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const regionLazyTreeApi = params => {
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return request({
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url: `/blade-system/region/lazy-tree`,
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method: 'get',
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params,
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})
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}
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// 定义组件属性
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const props = defineProps({
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modelValue: {
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type: [String, Number],
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default: ''
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},
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placeholder: {
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type: String,
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default: '请选择'
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},
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clearable: {
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type: Boolean,
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default: true
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},
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filterable: {
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type: Boolean,
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default: true
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},
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checkStrictly: {
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type: Boolean,
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default: true
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}
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})
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// 定义组件事件
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const emit = defineEmits(['update:modelValue', 'change'])
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// 组件内部状态
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const expandedKeys = ref([]) // 展开的节点
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const regionNodeCache = ref(new Map()) // 缓存区域节点
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// 树形选择器配置
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const treeSelectProps = {
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value: 'id',
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label: 'name',
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children: 'children',
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// 判断叶子节点
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isLeaf: (data, node) => {
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return node.level >= 2
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}
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}
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// 处理值变化
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function handleChange(value) {
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emit('update:modelValue', value)
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// 从缓存中获取区域名称
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const node = regionNodeCache.value.get(value)
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const areaName = node?.name || ''
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// 同时返回区域代码和区域名称
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emit('change', { code: value, name: areaName })
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}
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// 懒加载获取区域节点数据
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async function loadRegionNode(node, resolve) {
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try {
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// 限制只加载两级，当前节点 level >= 1 时不加载子节点
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if (node.level >= 2) {
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resolve([])
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return
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}
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// 初始化加载时传递 code 参数，加载子节点时传递 parentCode 参数
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const params = node.data?.id ? { parentCode: node.data.id } : { code: '360800000000' }
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const parentCode = node.data?.id || '360800000000'
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const res = await regionLazyTreeApi(params)
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const nodes = res?.data?.data || []
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// 处理返回的节点数据
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const processedNodes = nodes.map(item => {
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const nodeId = item.id || item.value
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// 缓存节点及其父节点关系
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regionNodeCache.value.set(nodeId, {
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id: nodeId,
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name: item.name || item.title || item.label,
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parentId: parentCode,
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hasChildren: item.hasChildren || false
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})
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return {
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id: nodeId,
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name: item.name || item.title || item.label,
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hasChildren: item.hasChildren || false
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}
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})
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resolve(processedNodes)
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} catch (error) {
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console.error('获取区域数据失败:', error)
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resolve([])
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}
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}
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// 加载区域节点路径
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async function loadRegionPath(regionCode) {
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if (!regionCode) return
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try {
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const path = []
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const queue = [{ code: '360800000000', currentPath: ['360800000000'] }]
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let found = false
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// 广度优先搜索，逐层加载节点直到找到目标节点
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while (queue.length > 0 && !found) {
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const { code, currentPath } = queue.shift()
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// 获取当前节点的子节点
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const res = await regionLazyTreeApi({ parentCode: code })
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const nodes = res?.data?.data || []
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for (const node of nodes) {
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const nodeId = node.id || node.value
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// 缓存节点及其父节点关系
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regionNodeCache.value.set(nodeId, {
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id: nodeId,
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name: node.name || node.title || node.label,
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parentId: code,
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hasChildren: node.hasChildren || false
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})
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// 检查是否找到目标节点
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if (nodeId === regionCode) {
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path.push(...currentPath, nodeId)
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found = true
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break
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}
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// 如果有子节点，加入队列继续搜索
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if (node.hasChildren) {
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queue.push({
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code: nodeId,
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currentPath: [...currentPath, nodeId]
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})
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}
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}
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}
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if (path.length > 0) {
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expandedKeys.value = path
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}
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} catch (error) {
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console.error('加载区域路径失败:', error)
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}
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}
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// 监听modelValue变化，当值变化时加载路径
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watch(
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() => props.modelValue,
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async (newValue) => {
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if (newValue) {
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await loadRegionPath(String(newValue))
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} else {
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expandedKeys.value = []
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}
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},
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{ immediate: true }
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)
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// 暴露方法给父组件
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defineExpose({
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loadRegionPath
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})
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</script>
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<style scoped lang="scss">
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</style>
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