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| <template>
| <el-form-item :label="placeholder">
| <el-cascader
| v-model="selectedOptions"
| :options="locations"
| :placeholder="placeholder"
| :props="optionProps"
| style="width: 280px"
| />
| </el-form-item>
| </template>
|
| <script>
| import { enumLocation } from '@/enum/location'
|
| // 记录选项是否是自定义传入的
| let customValue = true
|
| export default {
| props: {
| // 是否在首选项处添加“全部”选项
| allOption: {
| type: Boolean,
| default: true
| },
| // 查询的行政级别，取值1，2，3，4
| level: {
| type: Number,
| default: 4
| },
| // 结果返回
| value: Object,
| // 是否默认返回初始选项
| initValue: {
| type: Boolean,
| default: true
| },
| // 能否选择任意一级选项
| checkStrictly: {
| type: Boolean,
| default: true
| }
| },
| emits: ['update:value'],
| data() {
| return {
| locations: enumLocation(this.allOption, this.level),
| selectedOptions: [],
| optionProps: {
| checkStrictly: this.checkStrictly
| }
| }
| },
| computed: {
| placeholder() {
| const list = '省/市/区/镇'.split('/')
| const p = []
| for (let i = 0; i < this.level; i++) {
| p.push(list[i])
| }
| return p.join('/')
| }
| },
| watch: {
| selectedOptions: {
| handler(nVal, oVal) {
| if (nVal != oVal) {
| const res = this.optionFormat(nVal)
| // 标明此时的value更新是组件内部触发
| customValue = false
| this.$emit('update:value', res)
| }
| },
| deep: true
| },
| value: {
| handler(nVal, oVal) {
| // 只有当值是外部传入时，才触发更新
| if (!customValue) {
| customValue = true
| return
| }
| if (nVal != oVal) {
| if (nVal || nVal.length > 0) {
| this.selectedOptions = this.optionFormatReverse(nVal)
| }
| }
| },
| deep: true,
| immediate: true
| }
| },
| methods: {
| /**
| * 地区选项结果格式化
| */
| optionFormat(val) {
| const res = {
| pCode: null,
| pName: null,
| cCode: null,
| cName: null,
| dCode: null,
| dName: null,
| tCode: null,
| tName: null
| }
| if (val.length > 0) {
| res.pCode = val[0][0]
| res.pName = val[0][1]
| }
| if (val.length > 1) {
| res.cCode = val[1][0]
| res.cName = val[1][1]
| }
| if (val.length > 2) {
| res.dCode = val[2][0]
| res.dName = val[2][1]
| }
| if (val.length > 3) {
| res.tCode = val[3][0]
| res.tName = val[3][1]
| }
| return res
| },
| optionFormatReverse(val) {
| const res = []
| if (val.pCode) {
| res.push([val.pCode, val.pName])
| }
| if (val.cCode) {
| res.push([val.cCode, val.cName])
| }
| if (val.dCode) {
| res.push([val.dCode, val.dName])
| }
| if (val.tCode) {
| res.push([val.tCode, val.tName])
| }
| return res
| }
| },
| mounted() {
| if (this.initValue) {
| if (this.checkStrictly) {
| this.selectedOptions = [this.locations[0].value]
| } else {
| const f = (location) => {
| if (location.children && location.children.length > 0) {
| const r = f(location.children[0])
| r.unshift(location.value)
| return r
| } else {
| return [location.value]
| }
| }
| this.selectedOptions = f(this.locations[0])
| }
| }
| }
| }
| </script>
|
|
