treegrid component how to use lazy load data on rowExpand

[fengdie]

数据层级太多,数据量大。我想异步加载数据。但是不知道要怎么处理。
There are too many data levels and a large amount of data. I want to load data asynchronously. But I don't know what to do.

[jarry]

Bind the 'onRowExpand' event on the TreeGrid component. When a node has no children, load them and attach to the parent node.

Code:

onRowExpand(row){
  if (!row.children || !row.children.length){
    this.getChildren(row.id).then(children => {
      this.$set(row,'children',children);
    })
  }
},