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< docs >
-- -
order : 3
title :
zh - CN : 异步数据加载
en - US : load data asynchronously
-- -
# # zh - CN
点击展开节点 , 动态加载数据 。
# # en - US
To load data asynchronously when click to expand a treeNode .
< / docs >
< template >
< a -tree
v -model :expandedKeys ="expandedKeys"
v -model :selectedKeys ="selectedKeys"
:load-data ="onLoadData"
:tree-data ="treeData"
/ >
< / template >
< script lang = "ts" setup >
import { ref } from 'vue' ;
import type { TreeProps } from 'ant-design-vue' ;
const expandedKeys = ref < string [ ] > ( [ ] ) ;
const selectedKeys = ref < string [ ] > ( [ ] ) ;
const treeData = ref < TreeProps [ ' treeData ' ] > ( [
{ title : 'Expand to load' , key : '0' } ,
{ title : 'Expand to load' , key : '1' } ,
{ title : 'Tree Node' , key : '2' , isLeaf : true } ,
] ) ;
const onLoadData : TreeProps [ 'loadData' ] = treeNode => {
return new Promise < void > ( resolve => {
if ( treeNode . dataRef . children ) {
resolve ( ) ;
return ;
}
setTimeout ( ( ) => {
treeNode . dataRef . children = [
{ title : 'Child Node' , key : ` ${ treeNode . eventKey } -0 ` } ,
{ title : 'Child Node' , key : ` ${ treeNode . eventKey } -1 ` } ,
] ;
treeData . value = [ ... treeData . value ] ;
resolve ( ) ;
} , 1000 ) ;
} ) ;
} ;
< / script >