<!--
/**
* 树形下拉选择组件，下拉框展示树形结构，提供选择某节点功能，方便其他模块调用
* @author sxy https://bysjb.cn
* @date 2020-12-02
*/
-->
<template>
<div>
<div v-show="isShowSelect" class="mask" @click="isShowSelect = !isShowSelect" />
<el-popover
v-model="isShowSelect"
placement="bottom-start"
:width="width"
trigger="manual"
style="padding: 12px 0;"
@hide="popoverHide"
>
<el-tree
ref="tree"
class="common-tree"
:style="style"
:data="data"
:props="defaultProps"
:show-checkbox="multiple"
:node-key="nodeKey"
:check-strictly="checkStrictly"
default-expand-all
:expand-on-click-node="false"
:check-on-click-node="multiple"
:highlight-current="true"
@node-click="handleNodeClick"
@check-change="handleCheckChange"
/>
<el-select
slot="reference"
ref="select"
v-model="selectedData"
:style="selectStyle"
:size="size"
:multiple="multiple"
:clearable="clearable"
:collapse-tags="collapseTags"
class="tree-select"
@click.native="isShowSelect = !isShowSelect"
@remove-tag="removeSelectedNodes"
@clear="removeSelectedNode"
@change="changeSelectedNodes"
>
<el-option v-for="item in options" :key="item.value" :label="item.label" :value="item.value" />
</el-select>
</el-popover>
</div>
</template>
<script>
export default {
props: {
// 树结构数据
data: {
type: Array,
default() {
return []
}
},
defaultProps: {
type: Object,
default() {
return {
children: 'children',
label: 'name'
}
}
},
// 配置是否可多选
multiple: {
type: Boolean,
default() {
return false
}
},
// 配置是否可清空选择
clearable: {
type: Boolean,
default() {
return false
}
},
// 配置多选时是否将选中值按文字的形式展示
collapseTags: {
type: Boolean,
default() {
return false
}
},
nodeKey: {
type: String,
default() {
return 'id'
}
},
// 显示复选框情况下，是否严格遵循父子不互相关联
checkStrictly: {
type: Boolean,
default() {
return false
}
},
// 默认选中的节点key数组
checkedKeys: {
type: Array,
default() {
return []
}
},
size: {
type: String,
default() {
return 'medium'
}
},
width: {
type: Number,
default() {
return 250
}
},
height: {
type: Number,
default() {
return 300
}
}
},
data() {
return {
isShowSelect: false, // 是否显示树状选择器
options: [],
selectedData: [], // 选中的节点
style: 'width:' + (this.width - 24) + 'px;' + 'height:' + this.height + 'px;',
selectStyle: 'width:' + (this.width + 24) + 'px;',
checkedIds: [],
checkedData: []
}
},
watch: {
isShowSelect(val) {
// 隐藏select自带的下拉框
this.$refs.select.blur()
},
checkedKeys(val) {
console.log('checkedKeys', val)
if (!val) return
this.checkedKeys = val
this.initCheckedData()
}
},
mounted() {
this.initCheckedData()
},
methods: {
// 单选时点击tree节点，设置select选项
setSelectOption(node) {
const tmpMap = {}
tmpMap.value = node.key
tmpMap.label = node.label
this.options = []
this.options.push(tmpMap)
this.selectedData = node.key
},
// 单选，选中传进来的节点
checkSelectedNode(checkedKeys) {
var item = checkedKeys[0]
this.$refs.tree.setCurrentKey(item)
var node = this.$refs.tree.getNode(item)
this.setSelectOption(node)
},
// 多选，勾选上传进来的节点
checkSelectedNodes(checkedKeys) {
// this.$refs.tree.setCheckedKeys(checkedKeys)
// 优化select回显显示 有个延迟的效果
const that = this
setTimeout(function() {
that.$refs.tree.setCheckedKeys(checkedKeys)
}, 10)
// console.log('checkSelectedNodes', checkedKeys, this.selectedData)
},
// 单选，清空选中
clearSelectedNode() {
this.selectedData = []
this.$refs.tree.setCurrentKey(null)
},
// 多选，清空所有勾选
clearSelectedNodes() {
var checkedKeys = this.$refs.tree.getCheckedKeys() // 所有被选中的节点的 key 所组成的数组数据
for (let i = 0; i < checkedKeys.length; i++) {
this.$refs.tree.setChecked(checkedKeys[i], false)
}
},
initCheckedData() {
if (this.multiple) {
// 多选
// console.log(this.checkedKeys.length)
if (this.checkedKeys.length > 0) {
this.checkSelectedNodes(this.checkedKeys)
} else {
this.clearSelectedNodes()
}
} else {
// 单选
if (this.checkedKeys.length > 0) {
this.checkSelectedNode(this.checkedKeys)
} else {
this.clearSelectedNode()
}
}
},
popoverHide() {
if (this.multiple) {
this.checkedIds = this.$refs.tree.getCheckedKeys() // 所有被选中的节点的 key 所组成的数组数据
this.checkedData = this.$refs.tree.getCheckedNodes() // 所有被选中的节点所组成的数组数据
} else {
this.checkedIds = this.$refs.tree.getCurrentKey()
this.checkedData = this.$refs.tree.getCurrentNode()
}
this.$emit('popoverHide', this.checkedIds, this.checkedData)
},
// 单选，节点被点击时的回调,返回被点击的节点数据
handleNodeClick(data, node) {
if (!this.multiple) {
this.setSelectOption(node)
this.isShowSelect = !this.isShowSelect
this.$emit('change', this.selectedData)
}
},
// 多选，节点勾选状态发生变化时的回调
handleCheckChange() {
var checkedKeys = this.$refs.tree.getCheckedKeys() // 所有被选中的节点的 key 所组成的数组数据
// console.log('handleCheckChange', checkedKeys)
this.options = checkedKeys.map((item) => {
var node = this.$refs.tree.getNode(item) // 所有被选中的节点对应的node
const tmpMap = {}
tmpMap.value = node.key
tmpMap.label = node.label
return tmpMap
})
this.selectedData = this.options.map((item) => {
return item.value
})
this.$emit('change', this.selectedData)
},
// 多选,删除任一select选项的回调
removeSelectedNodes(val) {
this.$refs.tree.setChecked(val, false)
var node = this.$refs.tree.getNode(val)
if (!this.checkStrictly && node.childNodes.length > 0) {
this.treeToList(node).map(item => {
if (item.childNodes.length <= 0) {
this.$refs.tree.setChecked(item, false)
}
})
this.handleCheckChange()
}
this.$emit('change', this.selectedData)
},
treeToList(tree) {
var queen = []
var out = []
queen = queen.concat(tree)
while (queen.length) {
var first = queen.shift()
if (first.childNodes) {
queen = queen.concat(first.childNodes)
}
out.push(first)
}
return out
},
// 单选,清空select输入框的回调
removeSelectedNode() {
this.clearSelectedNode()
this.$emit('change', this.selectedData)
},
// 选中的select选项改变的回调
changeSelectedNodes(selectedData) {
// 多选,清空select输入框时，清除树勾选
if (this.multiple && selectedData.length <= 0) {
this.clearSelectedNodes()
}
this.$emit('change', this.selectedData)
}
}
}
</script>
<style scoped>
.mask {
width: 100%;
height: 100%;
position: fixed;
top: 0;
left: 0;
opacity: 0;
z-index: 11;
}
.common-tree {
overflow: auto;
}
.tree-select {
z-index: 111;
}
</style>
