elementui 的CascaderPanel级联面板类型懒加载回显

这个问题只出现在CascaderPanel级联面板上，级联的input不会有这个问题

1.CascaderPanel级联面板的显示，懒加载，都正常，到了编辑回显的时候，却死活只能显示到二级就报错了，

原始代码

html

1 <el-cascader-panel
2        v-model="cascaderVal"
3       ref="cascader"
4       class="full-width"
5       @change="handleCascaderChange"
6       @active-item-change="handleCascaderItemChange"
7        :props="props"
8 ></el-cascader-panel>

  1 data(){
  2    let this_ = this;
  3    return{
  4           isEdit: false,  
  5           showData: {
  6             modName: '',
  7             instanceName: '',
  8             actionName: ''
  9           },
 10           moduleLists: [],
 11           instanceLists: [],
 12           actionLists: [],
 13           actionParams: {},
 14           actionRules: {},
 15           actionFormLoading: false,
 16           cascaderVal: [],
 17           resolve_: null,
 18           props: {
 19             lazy: true,
 20             lazyLoad(node, resolve) {
 21               setTimeout(() => {
 22                 this_.lozyLoad(node, resolve);
 23               }, 100);
 24             }
 25           },
 26     }  
 27 },
 28 methods:{
 29     //在新增的时候，不需要回显，在编辑的时候，回显数据
 30    init(row){
 31       this.$nextTick(() => { 33             let this_ = this;
　　　　　　　　　　//v-model进行赋值，这个赋值，可以使得第一层面板进行回显
 34             this.cascaderVal = [row.moduleId, row.instanceId, row.actionId];
 35             setTimeout(() => {
 36               /**这里是对二级的回显 操作，需要自己手动执行一下懒加载的请求*/
 37               this.lozyLoad({ level: 2, data: row }, this.resolve_, 'render');
 38               /**这里不可以用this.cascaderVal，因为在props中，我对cascader进行了清空，双向绑定的情况下，这个值会被情空 */
 39               // this.cascaderVal = [row.moduleId, row.instanceId, row.actionId]; 也不可以对其赋值，会导致cas面板报错
 40               this.handleCascaderChange([row.moduleId, row.instanceId, row.actionId], 1); //
 41             }, 1800); //这个时间小了也容易报错
 42             /**解决第三级面板不回显高亮的问题,使用的是原生的方式回显，手动加class名称，之后点击的时候，再移除 */
 43             setTimeout(() => {
 44               let liLists = Array.from(document.getElementsByClassName('el-cascader-node'));
 45               liLists.forEach((item) => {
 46                 if (item.children[0].innerHTML == this.showData.actionName) {
 47                   // let str = `<i class="el-icon-check el-cascader-node__prefix"></i>${item.innerHTML}`;
 48                   item.className += ' in-active-path self-addclass';
 49                 }
 50               });
 51             }, 3000);//这个时间小了会获取不到三级面板
 53         });
 54    },
 55    async getModule() {
 56       await reqSoarModule().then((res) => {
 57         this.moduleLists = res.data;
 58       });
 59     },
 60     async getInstance(id) {
 61       await reqSoarInstance({ moduleId: id }).then((res) => {
 62         this.instanceLists = res.data;
 63       });
 64     },
 65     async getAction(id) {
 66       await reqSoarAction({ instanceId: id }).then((res) => {
 67         this.actionLists = res.data;
 68       });
 69     },
 70    lozyLoad(node, resolve, type) {
 71       let this_ = this;
 72       this.resolve_ = resolve;
 73       const { level, data } = node;
 74       let nodes = [];
 75       if (level >= 1) {
 76         if (level == 1) {
 77           this_.getInstance(data.moduleId).then(() => {
 78             setTimeout(function() {
 79               nodes = this_.instanceLists.map((item) => ({
 80                 value: item.instanceId,
 81                 label: item.name,
 82                 leaf: level >= 2,
 83                 level: level,
 84                 ...item
 85               }));
 86               resolve(nodes);
 87             }, 300);
 88           });
 89         } else {
 90           this_.getAction(data.instanceId).then(() => {
 91             setTimeout(function() {
 92               nodes = this_.actionLists.map((item) => ({
 93                 value: item.actionId,
 94                 label: item.name,
 95                 leaf: level >= 2,
 96                 level: level,
 97                 ...item
 98               }));
 99               /**为了解决编辑回显时不能正常显示的问题 */
100               if (!this_.isEdit || (this_.isEdit && type)) {
101                 resolve(nodes);
102               } else {
　　　　　　　　　　　　　//这一步可以解决报错
103                 this_.$refs.cascader.clearCheckedNodes();
104               }
105             }, 300);
106           });
107         }
108       } else {
109         if (!this_.moduleLists.length) {
110           this_.getModule().then(() => {
111             setTimeout(function() {
112               nodes = this_.moduleLists.map((item) => ({
113                 value: item.moduleId,
114                 label: item.name,
115                 level: level,
116                 leaf: false,
117                 ...item
118               }));
119               resolve(nodes);
120             }, 300);
121           });
122         } else {
123           setTimeout(function() {
124             nodes = this_.moduleLists.map((item) => ({
125               value: item.moduleId,
126               label: item.name,
127               level: level,
128               leaf: false,
129               ...item
130             }));
131             resolve(nodes);
132           }, 300);
133         }
134       }
135   },
　　
136 }

补充两个函数

// 级联面板前两个面板的change事件
   handleCascaderItemChange(data) {
      let len = data.length;
      if (len) {
        this.formData.moduleId = data[0];
        this.showData.modName = this.moduleLists.filter((item) => {
          return item.moduleId == data[0];
        })[0].name;
        if (len > 1) {
          this.formData.instanceId = data[1];
          this.showData.instanceName = this.instanceLists.filter((item) => {
            return item.instanceId == this.formData.instanceId;
          })[0].name;
        } else {
          this.showData.instanceName = '';
          this.showData.actionName = '';
          this.actionParams = {};
        }
      }
    },
    // 级联面板前第三步的change事件
    handleCascaderChange(data, type) {
      if (data.length) {
        this.formData.actionId = data[2];
        let actions = this.actionLists.filter((item) => {
          return item.actionId == this.formData.actionId;
        });
        /**使用原生方法，移除手动添加的active 状态的class名称 */
        let self = document.getElementsByClassName('self-addclass');
        if (self.length) {
          let spanLabel = self[0].children[1].innerHTML;
          if (spanLabel != actions[0].name) {
            self[0].className = 'el-cascader-node';
          }
        }
        this.actionFormLoading = true;
        this.showData.actionName = actions.length ? actions[0].name : '';
        this.actionParams = actions.length ? actions[0].parameters : {};
      }
   },

// 级联面板前两个面板的change事件
handleCascaderItemChange(data) {
let len = data.length;
if (len) {
this.formData.moduleId = data[0];
this.showData.modName = this.moduleLists.filter((item) => {
return item.moduleId == data[0];
})[0].name;
if (len > 1) {
this.formData.instanceId = data[1];
this.showData.instanceName = this.instanceLists.filter((item) => {
return item.instanceId == this.formData.instanceId;
})[0].name;
} else {
this.showData.instanceName = '';
this.showData.actionName = '';
this.actionParams = {};
}
}
},
// 级联面板前第三步的change事件
handleCascaderChange(data, type) {
if (data.length) {
this.formData.actionId = data[2];
let actions = this.actionLists.filter((item) => {
return item.actionId == this.formData.actionId;
});
/**使用原生方法，移除手动添加的active 状态的class名称 */
let self = document.getElementsByClassName('self-addclass');
if (self.length) {
let spanLabel = self[0].children[1].innerHTML;
if (spanLabel != actions[0].name) {
self[0].className = 'el-cascader-node';
}
}
this.actionFormLoading = true;
this.showData.actionName = actions.length ? actions[0].name : '';
this.actionParams = actions.length ? actions[0].parameters : {};
this.renderActionForm();
}

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原文地址：https://www.cnblogs.com/fyjz/p/15656156.html

elementui 的CascaderPanel级联面板类型 懒加载 回显

elementui 的CascaderPanel级联面板类型懒加载回显