背景：由于项目需求需要使用下拉选择框的组织架构树

实现代码如下：

 <el-row><el-col :span="18"><el-form-item label="所属组织:" prop="groupName"><el-select v-model="dataForm.groupName" placeholder="请选择" ><!-- <el-input placeholder="输入关键字进行过滤" v-model="filterText"></el-input> --><div class="select-tree"><el-option hidden :label="dataForm.groupName" :value="dataForm.id" style="width: 100px;"></el-option><el-tree :data="groupList" :props="defaultProps" @node-click="handleNodeClick" :filter-node-method="filterNode" ref="tree"></el-tree></div></el-select></el-form-item> </el-col>               </el-row>

   data() {return {defaultProps: {children: 'childList',label: 'groupName',id:'id'},filterText: '',// filters: {// deptName: '',// deptCode: ''// },dataForm:{groupName: '',id: ''},rules: {groupName: [{ required: true,message:'请选择组织', trigger: 'blur' }],},};},
watch:{filterText(val) {this.$refs.tree.filter(val);}},methods: {//关键字过滤filterNode(value, data) {if (!value) return true;return data.label.indexOf(value) !== -1;},//点击选择handleNodeClick(data) {let self = this;self.dataForm.groupName = data.groupNameself.dataForm.id = data.id},}

注意：groupList为组织结构的数据，具体情况结合自己的项目。

css：

::v-deep.select-tree{width: 240px;height: 100%;.el-tree {background: #FFFFFF;//el-tree组件中class名为el-tree-node的div是块级元素，需要把它变为inline-block才出现滚动条，同时注意每一个节点占一行,//由于选择框组织树需要添加el-tree-node__children 如下所示.el-tree>.el-tree-node {display: inline-block;min-width: 100%;}.el-tree-node__children{overflow: visible!important;}// 选择框改成灰色//  .el-checkbox__inner {//   background-color: #edf2fc;// }// 人员树高度.el-tree-node__content {height: 31px;display: block!important;}// 人员树内容鼠标悬浮颜色.el-tree-node__content:hover{// background-color: #FFEFED !important;background-color: #FFFFFF !important;width: 100% !important;}// 人员树内容鼠标点击背景颜色.el-tree-node:focus > .el-tree-node__content {      // background-color: #FFEFED  !important;background-color: #FFFFFF !important;}// 箭头颜色更改.el-tree-node__expand-icon {color:#A4AEBB;font-size: 19*0.87px;}//人员树字体大小.el-tree-node__label {font-size: 19*0.87px;}
}
}

其中，添加了

.el-tree-node__children{

        overflow: visible!important;

    }

才正常出现横向滚动条

效果图如下：