el-tree结合el-tree-transfer实现穿梭框里展示树形数据

参考文章：我把他的弹框单拉出来一个独立文件作为组件方便使用，遇到一些问题记录一下。

testComponet.vue

<template><div class="per_container"><div class="per_con_left"><div class="per_con_title">未选</div><div class="check_all"><el-checkbox:indeterminate="config.left.isIndeterminate"v-model="config.left.checkAll"@change="handleCheckAll($event, 'left')">全选/全不选</el-checkbox></div><div class="tree"><el-treeref="treeLeft":data="treeDataArr":props="propsDefault"node-key="id"show-checkbox:filter-node-method="filterNodeLeft"@check-change="handleCheckChange('left')"/></div></div><div class="operation"><el-button type="primary" @click="toRight()">移入<i class="el-icon-d-arrow-right"></i></el-button><el-button type="primary" icon="el-icon-d-arrow-left" @click="toLeft()">移除</el-button></div><div class="per_con_right"><div class="per_con_title">已选</div><div class="check_all"><el-checkbox:indeterminate="config.right.isIndeterminate"v-model="config.right.checkAll"@change="handleCheckAll($event, 'right')">全选/全不选</el-checkbox></div><div class="tree"><el-treeref="treeRight":data="treeDataArr":props="propsDefault"node-key="id"show-checkbox:filter-node-method="filterNodeRight"@check-change="handleCheckChange('right')"/></div></div></div>
</template>
<script>
export default {props: ['treeData'],mounted() {this.treeDataArr = this.treeData;this.allParentKeys = this.treeDataArr.map((item) => {return item.id;});if (this.$refs.treeLeft && this.$refs.treeRight) {this.$nextTick(() => {this.setTreeFilter();});}},created() {// this.treeDataArr = this.treeData;// this.allParentKeys = this.treeDataArr.map((item) => {//     return item.id;// });// if (this.$refs.treeLeft && this.$refs.treeRight) {//     this.$nextTick(() => {//         this.setTreeFilter();//     });// }},  data() {return {propsDefault: {label: "name"},isIndeterminateL: false,isIndeterminateR: false,checkAllLeft: false,checkAllRight: false,treeDataArr: [],checkedKeys: [],halfCheckedKeys: [],checkedNodes: [],config: {left: {isIndeterminate: false,checkAll: false,ref: "treeLeft"},right: {isIndeterminate: false,checkAll: false,ref: "treeRight"}}};},methods: {setTreeFilter() {this.$refs.treeLeft.filter();this.$refs.treeRight.filter();},toLeft() {this.checkedKeys = this.$refs.treeRight.getCheckedKeys();this.halfCheckedKeys = this.$refs.treeRight.getHalfCheckedKeys();this.settreeDataArr(this.treeDataArr, false);this.setTreeFilter();this.$refs.treeLeft.setCheckedKeys(this.checkedKeys);this.$refs.treeRight.setCheckedKeys([]);},toRight() {this.checkedKeys = this.$refs.treeLeft.getCheckedKeys();this.halfCheckedKeys = this.$refs.treeLeft.getHalfCheckedKeys();this.settreeDataArr(this.treeDataArr, true);this.setTreeFilter();this.$refs.treeRight.setCheckedKeys(this.checkedKeys);this.$refs.treeLeft.setCheckedKeys([]);},filterNodeLeft(value, data) {console.log('filterNodeLeft',data);return !data.selected;},filterNodeRight(value, data) {console.log('filterNodeRight',data);return data.selected;},// 递归设置数据选中状态settreeDataArr(tree, type) {const setTree = (treeDataArr) => {treeDataArr.forEach((item, index) => {if (this.checkedKeys.includes(item.id)) {treeDataArr[index].selected = type;}if (item.children && item.children.length) {setTree(item.children);// 判断半选框是否需要移动if (this.halfCheckedKeys.includes(item.id)) {if (type) {treeDataArr[index].selected = type;} else {const target = treeDataArr[index].children.find((it) => {return it.selected;});if (!target) {treeDataArr[index].selected = type;}}}}});};setTree(tree);},submitEdit() {this.$emit("permissionData", this.treeDataArr);},// 勾选树结构时判断是否勾选上面的全选handleCheckChange(type) {this.checkedNodes = this.$refs[this.config[type].ref].getCheckedNodes();const pIds = this.checkedNodes.filter((item) => {return !item.pId;});if (!pIds.length) {this.config[type].checkAll = false;this.config[type].isIndeterminate = false;return;}if (pIds.length === this.allParentKeys.length) {this.config[type].checkAll = true;this.config[type].isIndeterminate = false;} else {this.config[type].isIndeterminate = true;this.config[type].checkAll = false;}},// 全选handleCheckAll(value, type) {const keys = value? this.treeDataArr.map((item) => {return item.id;}): [];this.$refs[this.config[type].ref].setCheckedKeys(keys, false);}}
};
</script>
<style lang="scss" scoped>
.per_container {display: flex;height: 500px;justify-content: space-between;align-items: center;
}
.per_con_left,
.per_con_right {width: 45%;height: 100%;
}
.operation {display: flex;flex-direction: column;align-items: center;justify-content: center;padding: 20px;
}
.operation .el-button {margin-left: 0;margin-bottom: 10px;
}
.per_con_title {height: 42px;line-height: 26px;border-radius: 8px 8px 0 0;padding: 8px;align-self: stretch;background: #f2f6f9;font-size: 16px;box-sizing: border-box;border: 1px solid #d8d8d8;font-weight: 700;text-align: left;
}
.check_all {height: 42px;line-height: 42px;padding: 0 5px;border: 1px solid #d8d8d8;border-top: none;text-align: left;
}
.tree {height: calc(100% - 82px);border: 1px solid #d8d8d8;border-top: none;overflow: auto;
}
</style>

思路：
（1）思路二：利用elementUI的filter API对选中节点进行筛选，左侧筛选出未选中的，右侧筛选出选中的，用的还是同一棵树，用一个属性来区分是否选择，好处是子节点选中，父节点会跟随保存，不用重新构建树结构。
（2）通过监听treeData值变化，调用setTreeFilter也就是this.$refs.treeLeft.filter(); this.$refs.treeRight.filter();
里的filter 方法，filter 是 el-tree 组件用于动态过滤树节点，配合 filter-node-method 属性可以实现节点过滤，自定义左右侧树过滤的规则分别是是filterNodeLeft(value, data) { return !data.selected;},和filterNodeRight(value, data) {return data.selected;},是否被选中（左移右移来设置selected属性）

testIndex.vue

<template><div><!-- 其他页面内容 --><TestComponent :treeData="myTreeData" /></div>
</template><script>
import TestComponent from '@/views/test/test.vue';export default {components: {TestComponent},data() {return {myTreeData: [// 这里放置你的树形数据{id: 1,name: '父节点1',children: [{id: 2,name: '子节点1'}]}]};},// ... existing code ...
};
</script>

关于监听treeData变化后给树赋数据这里遇到问题：我把原文监听treeData对树进行初始化一开始写在created里，导致左右都有树，然后改为mounted就没有这个问题。
原因：（操作DOM元素用mounted ）
依赖 DOM 元素 ： setTreeFilter 方法可能依赖于 this.$refs.treeLeft 和 this.$refs.treeRight 这两个 DOM 引用。在 created 阶段，DOM 元素还未挂载， this.$refs 无法正确获取到对应的 DOM 元素，从而导致过滤逻辑无法正常执行。而在 mounted 阶段，DOM 元素已经挂载完成， this.$refs 可以正常获取到对应的 DOM 元素，过滤逻辑就能正常工作了。

treeData: {handler(val) {this.treeDataArr = val;this.allParentKeys = this.treeDataArr.map((item) => {return item.id;});if (this.$refs.treeLeft && this.$refs.treeRight) {this.$nextTick(() => {this.setTreeFilter();});}},deep: true,},
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版权声明：本文为博主原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接和本声明。原文链接：https://blog.csdn.net/Error_ABC/article/details/136877442

 created() {// this.treeDataArr = this.treeData;// this.allParentKeys = this.treeDataArr.map((item) => {//     return item.id;// });// if (this.$refs.treeLeft && this.$refs.treeRight) {//     this.$nextTick(() => {//         this.setTreeFilter();//     });// }},