記錄element Select 下拉選擇器結合Tree 樹形控件實現（選中自動收起）

粗略記錄一下自己做過的總結  此文章代碼爲項目中組件

template部分

<template>
    <el-select ref="selectTree1" :value="value" v-model="valueTitle" :clearable="clearable" @clear="clearHandle">
        <el-option :value="valueTitle" :label="valueTitle" class="options">
            <el-tree
                    id="tree-option"
                    ref="selectTree"
                    :accordion="accordion"
                    :data="options"
                    :props="props"
                    :node-key="props.value"
                    :default-expanded-keys="defaultExpandedKey"
                    @node-click="handleNodeClick">
                <span slot-scope="{ node, data }">
                        <i :class="[data.color!=null?'ification_col':'']" :style="{'background-color':data.color}"></i>&nbsp;&nbsp;{{ data.name }}
                    </span>
            </el-tree>
        </el-option>
    </el-select>
</template>

js部分：

<script>
    export default {
        name: "el-tree-select",
        props: {

            // 配置項
            props: {
                type: Object,
                default: {
                  value: 'id',
                  children: 'children',
                  label: 'name'
                }
            },

            // 選項列表數據(樹形結構的對象數組)
            options: {type: Array, default: []},

            // 初始值
            // value:{ type: Number, default: null },
            value: {type: Object, default: {}},

            // 可清空選項
            clearable: {type: Boolean, default: true},

            // 自動收起
            accordion: {type: Boolean, default: false}

        },
        data() {
            return {
                value1:'',
                valueId: null,
                valueTitle: '',
                defaultExpandedKey: [],
                labelSelection: {},
            }
        },
        mounted() {
            console.log(this.value.id);
            this.valueId = this.value.name;   // 初始值
            this.initHandle();
        },
        methods: {
            // 初始化值
            initHandle() {
                if (this.valueId) {
                    console.log(this.valueId);
                    // this.valueTitle = this.$refs.selectTree.getNode(this.valueId).data[this.props.label];     // 初始化顯示
                    this.valueTitle = this.valueId.name;     // 初始化顯示
                    this.$refs.selectTree.setCurrentKey(this.valueId)       // 設置默認選中
                    this.defaultExpandedKey = [this.valueId]      // 設置默認展開
                }
                this.initScroll()
            },

            // 初始化滾動條
            initScroll() {
                this.$nextTick(() => {
                    let scrollWrap = document.querySelectorAll('.el-scrollbar .el-select-dropdown__wrap')[0]
                    let scrollBar = document.querySelectorAll('.el-scrollbar .el-scrollbar__bar')
                    scrollWrap.style.cssText = 'margin: 0px; max-height: none; overflow: hidden;'
                    scrollBar.forEach(ele => ele.style.width = 0)
                })
            },

            // 切換選項
            handleNodeClick(node) {
                console.log(node);
                if (node.children.length<=0){
                    this.$refs.selectTree1.blur();
                    this.valueTitle = node[this.props.label];
                    this.valueId = node;
                    this.$emit('getValue', this.valueId);
                    this.defaultExpandedKey = [];
                }
            },
            // 清除選中
            clearHandle() {
                this.valueTitle = ''
                this.valueId = null
                this.defaultExpandedKey = []
                this.clearSelected()
                this.$emit('getValue', null)
            },

            // 清空選中樣式
            clearSelected() {
                let allNode = document.querySelectorAll('#tree-option .el-tree-node')
                allNode.forEach((element) => element.classList.remove('is-current'))
            }

        },

        watch: {
            value() {
                this.valueId = this.value
                this.initHandle()
            }
        },
    }
</script>

css部分：

<style scoped>
    .el-scrollbar .el-scrollbar__view .el-select-dropdown__item {
        height: auto;
        max-height: 274px;
        padding: 0;
        overflow: hidden;
        overflow-y: auto;
    }

    .el-select-dropdown__item.selected {
        font-weight: normal;
    }

    ul li >>> .el-tree .el-tree-node__content {
        height: auto;
        padding: 0 20px;
    }

    .el-tree-node__label {
        font-weight: normal;
    }

    .el-tree >>> .is-current .el-tree-node__label {
        color: #409EFF;
        font-weight: 700;
    }

    .el-tree >>> .is-current .el-tree-node__children .el-tree-node__label {
        color: #606266;
        font-weight: normal;
    }

    .el-popper {
        z-index: 9999;
    }
    .ification_col {
        width: 20px;
        height: 10px;
        display: inline-block;
    }
</style>