基于element-ui封装select下拉树形_element ui 树形选择控件封装

1.ELEMENT实现下拉树

组件调用

<template>
  <!-- 行模式 -->
  <el-form inline>
    <el-form-item label="inline 默认：">
      <select-tree :options="options" v-model="selected" />
    </el-form-item>
    <el-form-item label="inline 定义宽度：">
      <select-tree width="200" :options="options" v-model="selected" />
    </el-form-item>
  </el-form>
  <!-- 块模式 -->
  <el-form>
    <el-form-item label="自适应：">
      <select-tree v-model="selected" :options="options" :props="defaultProps" />
    </el-form-item>
  </el-form>
</template>

<script>
import SelectTree from '@/components/widget/SelectTree.vue';

export default {
  name: 'about',
  components: {
    SelectTree,
  },
  data() {
    return {
      // 默认选中值
      selected: 'A',
      // 数据默认字段
      defaultProps: {
        parent: 'parentId',   // 父级唯一标识
        value: 'id',          // 唯一标识
        label: 'label',       // 标签显示
        children: 'children', // 子级
      },
      // 数据列表
      options: [
        {
          parentId: '0',
          id: 'A',
          label: 'label-A',
          children: [
            {
              parentId: 'A',
              id: 'A-1',
              label: 'label-A-1',
            },
          ],
        },
        {
          parentId: '0',
          value: 'B',
          label: 'label-B',
          children: [],
        },
      ],
    };
  },
};
</script>
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62

selectTree.vue文件

<!-- 树状选择器 -->
<template>
  <el-popover
    ref="popover"
    placement="bottom-start"
    trigger="click"
    @show="onShowPopover"
    @hide="onHidePopover">
    <el-tree
      ref="tree"
      class="select-tree"
      highlight-current
      :style="`min-width: ${treeWidth}`"
      :data="data"
      :props="props"
      :expand-on-click-node="false"
      :filter-node-method="filterNode"
      :default-expand-all="false"
      @node-click="onClickNode">
    </el-tree>
    <el-input
      slot="reference"
      ref="input"
      v-model="labelModel"
      clearable
      :style="`width: ${width}px`"
      :class="{ 'rotate': showStatus }"
      suffix-icon="el-icon-arrow-down"
      :placeholder="placeholder">
    </el-input>
  </el-popover>
</template>

<script>
export default {
  name: 'Pagination',
  props: {
    // 接收绑定参数
    value: String,
    // 输入框宽度
    width: String,
    // 选项数据
    options: {
      type: Array,
      required: true,
    },
    // 输入框占位符
    placeholder: {
      type: String,
      required: false,
      default: '请选择',
    },
    // 树节点配置选项
    props: {
      type: Object,
      required: false,
      default: () => ({
        parent: 'parentId',
        value: 'rowGuid',
        label: 'areaName',
        children: 'children',
      }),
    },
  },
  // 设置绑定参数
  model: {
    prop: 'value',
    event: 'selected',
  },
  computed: {
    // 是否为树状结构数据
    dataType() {
      const jsonStr = JSON.stringify(this.options);
      return jsonStr.indexOf(this.props.children) !== -1;
    },
    // 若非树状结构，则转化为树状结构数据
    data() {
      return this.dataType ? this.options : this.switchTree();
    },
  },
  watch: {
    labelModel(val) {
      if (!val) {
        this.valueModel = '';
      }
      this.$refs.tree.filter(val);
    },
    value(val) {
      this.labelModel = this.queryTree(this.data, val);
    },
  },
  data() {
    return {
      // 树状菜单显示状态
      showStatus: false,
      // 菜单宽度
      treeWidth: 'auto',
      // 输入框显示值
      labelModel: '',
      // 实际请求传值
      valueModel: '0',
    };
  },
  created() {
    // 检测输入框原有值并显示对应 label
    if (this.value) {
      this.labelModel = this.queryTree(this.data, this.value);
    }
    // 获取输入框宽度同步至树状菜单宽度
    this.$nextTick(() => {
      this.treeWidth = `${(this.width || this.$refs.input.$refs.input.clientWidth) - 24}px`;
    });
  },
  methods: {
    // 单击节点
    onClickNode(node) {
      this.labelModel = node[this.props.label];
      this.valueModel = node[this.props.value];
      this.onCloseTree();
    },
    // 偏平数组转化为树状层级结构
    switchTree() {
      return this.cleanChildren(this.buildTree(this.options, '0'));
    },
    // 隐藏树状菜单
    onCloseTree() {
      this.$refs.popover.showPopper = false;
    },
    // 显示时触发
    onShowPopover() {
      this.showStatus = true;
      this.$refs.tree.filter(false);
    },
    // 隐藏时触发
    onHidePopover() {
      this.showStatus = false;
      this.$emit('selected', this.valueModel);
    },
    // 树节点过滤方法
    filterNode(query, data) {
      if (!query) return true;
      return data[this.props.label].indexOf(query) !== -1;
    },
    // 搜索树状数据中的 ID
    queryTree(tree, id) {
      let stark = [];
      stark = stark.concat(tree);
      while (stark.length) {
        const temp = stark.shift();
        if (temp[this.props.children]) {
          stark = stark.concat(temp[this.props.children]);
        }
        if (temp[this.props.value] === id) {
          return temp[this.props.label];
        }
      }
      return '';
    },
    // 将一维的扁平数组转换为多层级对象
    buildTree(data, id = '0') {
      const fa = (parentId) => {
        const temp = [];
        for (let i = 0; i < data.length; i++) {
          const n = data[i];
          if (n[this.props.parent] === parentId) {
            n.children = fa(n.rowGuid);
            temp.push(n);
          }
        }
        return temp;
      };
      return fa(id);
    },
    // 清除空 children项
    cleanChildren(data) {
      const fa = (list) => {
        list.map((e) => {
          if (e.children.length) {
            fa(e.children);
          } else {
            delete e.children;
          }
          return e;
        });
        return list;
      };
      return fa(data);
    },
  },
};
</script>

<style>
  .el-input.el-input--suffix {
    cursor: pointer;
    overflow: hidden;
  }
  .el-input.el-input--suffix.rotate .el-input__suffix {
    transform: rotate(180deg);
  }
  .select-tree {
    max-height: 350px;
    overflow-y: scroll;
  }
  /* 菜单滚动条 */
  .select-tree::-webkit-scrollbar {
    z-index: 11;
    width: 6px;
  }
  .select-tree::-webkit-scrollbar-track,
  .select-tree::-webkit-scrollbar-corner {
    background: #fff;
  }
  .select-tree::-webkit-scrollbar-thumb {
    border-radius: 5px;
    width: 6px;
    background: #b4bccc;
  }
  .select-tree::-webkit-scrollbar-track-piece {
    background: #fff;
    width: 6px;
  }
</style>
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223