前端递归异步生成目录树
需要，给出一个根节点id，每个节点都会发动异步申请，递归生成目录树
let queryTreeById = async (entityId = '') => { let result = await httpRequst({ method: "GET", path: "/admin/******?entityId=" + entityId }) //树状格局 let tree = result.map(({code, entityId, parentId, hasChild}) => ({code, entityId, parentId, hasChild})) return tree}
function loadTree(item,result){//item 以后节点信息，result是对象 进行存储树结构数据 return new Promise((resolve,reject)=>{ if(item.hasChild){//须要异步加载节点 queryTreeById(item.entityId).then(list=>{ result['children']=list let arr=[] list.forEach((item,index) => { arr[index]=loadTree(result['children'][index],result['children'][index]) }); Promise.all(arr).then(values=>{ return resolve(values) }) }) }else{//子节点不须要异步加载 完结此子节点 return resolve(result) } })}
let obj={//最终后果 用来装载数据 children: []}let rootInfo={entityId:134267,hasChild:true}//根节点信息loadTree(rootInfo,obj).then(()=>{ console.log('申请完结') console.log(JSON.stringify(obj))})
输入后果
申请完结{"children":[{"code":"表治理","entityId":134254,"parentId":134267,"hasChild":false},{"code":"test","entityId":134255,"parentId":134267,"hasChild":false},{"code":"油站","entityId":134275,"parentId":134267,"hasChild":true,"children":[{"code":"油站","entityId":134276,"parentId":134275,"hasChild":true,"children":[{"code":"管嘴信息表","entityId":134277,"parentId":134276,"hasChild":false}]}]},{"code":"盘车安装电动机","entityId":134278,"parentId":134267,"hasChild":true,"children":[{"code":"管嘴信息表","entityId":134279,"parentId":134278,"hasChild":false}]},{"code":"墙","entityId":134268,"parentId":134267,"hasChild":true,"children":[{"code":"根本墙","entityId":134269,"parentId":134268,"hasChild":true,"children":[{"code":"dsdds","entityId":134270,"parentId":134269,"hasChild":true,"children":[{"code":"hggj","entityId":134271,"parentId":134270,"hasChild":false},{"code":"hggj2","entityId":134272,"pachildren":[{"code":"管嘴信息表","entityId":134277,"parentId":134276,"hasChild":false}]}]},{"code":"盘车安装电动机","entityId":134278,"parentId":134267,"hasChild":true,"children":[{"code":"管嘴信息表","entityId":134279,"parentId":134278,"hasChild":false}]},{"code":"墙","entityId":134268,"parentId":134267,"hasChild":true,"children":[{"code":"根本墙","entityId":134269,"parentId":134268,"hasChild":true,"children":[{"code":"dsdds","entityId":134270,"parentId":134269,"hasChild":true,"children":[{"code":"hggj","entityId":134271,"parentId":134270,"hasChild":false},{"code":"hggj2","entityId":134272,"parentId":134270,"hasChild":false}]}]}]}]}