***忘记摘抄那个博客的了,闲的时候记录了下;现在vue3版本的element-ui已经有类似的组件了
<!--
/**
* 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
* 调用示例：
* <tree-select
* :height="400" // 下拉框中树形高度
* :width="200" // 下拉框中树形宽度
* size="small" // 输入框的尺寸: medium/small/mini
* :data="data" // 树结构的数据
* :defaultProps="defaultProps" // 树结构的props
* multiple // 多选
* clearable // 可清空选择
* colkStrilapseTags // 多选时将选中值按文字的形式展示
* checctly // 多选时，严格遵循父子不互相关联
* :nodeKey="nodeKey" // 绑定nodeKey，默认绑定'id'
* :checkedKeys="defaultCheckedKeys" // 传递默认选中的节点key组成的数组
* @popoverHide="popoverHide"> // 事件有两个参数：第一个是所有选中的节点ID，第二个是所有选中的节点数据
* </tree-select>
*/
-->
<template>
<div class="treeSelect">
<div
class="mask"
v-show="isShowSelect"
@click="isShowSelect = !isShowSelect"
></div>
<el-popover
placement="bottom-start"
:width="width"
trigger="manual"
v-model="isShowSelect"
@hide="popoverHide"
>
<el-tree
class="common-tree"
:style="style"
ref="tree"
:data="data"
:props="defaultProps"
:show-checkbox="multiple"
:node-key="nodeKey"
:check-strictly="checkStrictly"
:default-expand-all="defaultexpandall"
:expand-on-click-node="false"
:check-on-click-node="multiple"
:highlight-current="true"
:auto-expand-parent="true"
:default-expanded-keys="checkedKeys"
@node-click="handleNodeClick"
@check-change="handleCheckChange"
></el-tree>
<el-select
:style="selectStyle"
slot="reference"
ref="select"
:size="size"
v-model="selectedData"
:multiple="multiple"
:clearable="clearable"
:collapse-tags="collapseTags"
@click.native="isShowSelect = !isShowSelect"
@remove-tag="removeSelectedNodes"
@clear="removeSelectedNode"
@change="changeSelectedNodes"
@visible-change="changeIcon($event)"
class="tree-select"
>
<el-option
v-for="item in options"
:key="item.value"
:label="item.label"
:value="item.value"
></el-option>
</el-select>
</el-popover>
</div>
</template>
<script>
export default {
name: "tree-select",
props: {
// 树结构数据
data: {
type: Array,
default() {
return [];
},
},
defaultProps: {
type: Object,
default() {
return {};
},
},
// 是否展开
defaultexpandall: {
type: Boolean,
default() {
return true;
},
},
// 配置是否可多选
multiple: {
type: Boolean,
default() {
return false;
},
},
// 配置是否可清空选择
clearable: {
type: Boolean,
default() {
return true;
},
},
// 配置多选时是否将选中值按文字的形式展示
collapseTags: {
type: Boolean,
default() {
return false;
},
},
nodeKey: {
type: String,
default() {
return "id";
},
},
// 显示复选框情况下，是否严格遵循父子不互相关联
checkStrictly: {
type: Boolean,
default() {
return false;
},
},
// 默认选中的节点key数组
checkedKeys: {
type: Array,
default() {
return [];
},
},
size: {
type: String,
default() {
return "small";
},
},
width: {
type: Number,
default() {
return 220;
},
},
height: {
type: Number,
default() {
return 260;
},
},
// 单选情况下 展示所有父级名称
single: {
type: Boolean,
default: false,
},
},
data() {
return {
isShowSelect: false, // 是否显示树状选择器
options: [],
selectedData: [], // 选中的节点
style: "height:" + this.height + "px;",
selectStyle: "width:" + this.width + "px;",
checkedIds: [],
checkedData: [],
};
},
mounted() {
this.initCheckedData();
},
methods: {
filterNode(value, data) {
if (!value) return true;
return data.label.indexOf(value) !== -1;
},
changeIcon(callBack) {
this.$emit("changeIcon", callBack);
},
// 单选时点击tree节点，设置select选项
setSelectOption(node) {
// 多个层级 拼接
let nav_title1 = "",
nav_title2 = "",
nav_title3 = "",
nav_title4 = "";
switch (node.level) {
case 1:
nav_title1 = node.data.roomName;
nav_title2 = "";
nav_title3 = "";
nav_title4 = "";
break;
case 2:
nav_title1 = node.parent.data.roomName + " - ";
nav_title2 = node.data.roomName;
nav_title3 = "";
nav_title4 = "";
break;
case 3:
nav_title1 = node.parent.parent.data.roomName + " - ";
nav_title2 = node.parent.data.roomName + " - ";
nav_title3 = node.data.roomName;
nav_title4 = "";
break;
case 4:
nav_title1 = node.parent.parent.parent.data.roomName + " - ";
nav_title2 = node.parent.parent.data.roomName + " - ";
nav_title3 = node.parent.data.roomName + " - ";
nav_title4 = node.data.roomName;
break;
default:
break;
}
let value = nav_title1 + nav_title2 + nav_title3 + nav_title4;
let tmpMap = {};
tmpMap.value = node.key;
tmpMap.label = node.label;
this.options = [];
if (this.single) {
tmpMap.label = value;
}
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);
if (this.checkedKeys.length != 0) {
this.$emit("change", node);
}
},
// 多选，勾选上传进来的节点
checkSelectedNodes(checkedKeys) {
this.$refs.tree.setCheckedKeys(checkedKeys);
},
// 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.$refs.tree.setChecked(checkedKeys[i], false);
}
},
initCheckedData() {
if (this.multiple) {
// 多选
if (this.checkedKeys.length > 0) {
this.checkSelectedNodes(this.checkedKeys);
} else {
this.clearSelectedNodes();
}
} else {
// 单选
if (this.checkedKeys.length > 0) {
this.checkSelectedNode(this.checkedKeys);
} else {
this.clearSelectedNode();
}
}
},
popoverHide() {
if (this.multiple) {
this.checkedIds = this.$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.$emit("change", node);
}
},
// 多选，节点勾选状态发生变化时的回调
handleCheckChange() {
var checkedKeys1 = this.$refs.tree.getCheckedKeys(); // 所有被选中的节点的 key 所组成的数组数据
// ************ 二次修改,修复了全选报错问题********************
var checkedKeys = [];
checkedKeys1.map((ele, index) => {
if (ele != undefined) {
checkedKeys.push(ele);
}
});
// ***********************************
this.options = checkedKeys.map((item) => {
var node = this.$refs.tree.getNode(item); // 所有被选中的节点对应的node
let tmpMap = {};
// 过滤掉 父级
if (node.childNodes.length == 0) {
tmpMap.value = node.key;
tmpMap.label = node.label;
tmpMap.disabled = node.disabled;
tmpMap.childNodes = node.childNodes;
}
return tmpMap;
});
// if (this.options.length > 10) {
// return false;
// }
this.selectedData = this.options.map((item) => {
return item.value;
});
let arr_Data = this.selectedData.filter((item) => item);
this.$emit("change", arr_Data);
},
// 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.$refs.tree.setChecked(item, false);
}
});
this.handleCheckChange();
}
let arr_Data = this.selectedData.filter((item) => item);
this.$emit("change", arr_Data);
},
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.$emit("change", this.selectedData);
},
// 选中的select选项改变的回调
changeSelectedNodes(selectedData) {
// 多选,清空select输入框时，清除树勾选
if (this.multiple && selectedData.length <= 0) {
this.clearSelectedNodes();
}
console.log(this.selectedData);
this.$emit("change", this.selectedData);
},
},
watch: {
isShowSelect() {
// 隐藏select自带的下拉框
this.$refs.select.blur();
},
checkedKeys(val) {
if (!val) return;
this.checkedKeys = val;
this.initCheckedData();
},
},
};
</script>
<style lang="scss" 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>
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