二.数据库
三.前端页面代码
<template> <el-tree :props="props" :load="loadNode" lazy show-checkbox> </el-tree> </template> <script> export default { data () { return { props: { label: 'name', children: 'zones', isLeaf: 'leaf', }, }; }, methods: { loadNode (node, resolve) { //如果展开第一级节点,从后台加载一级节点列表 if (node.level == 0) { this.loadfirstnode(resolve); } //如果展开其他级节点,动态从后台加载下一级节点列表 if (node.level >= 1) { this.loadchildnode(node, resolve); } }, //加载第一级节点 loadfirstnode (resolve) { this.api({ url: "/test/tree", method: "post", }).then(data => { console.log(data); //this.data = data.list; return resolve(data.list); }) }, //加载节点的子节点集合 loadchildnode (node, resolve) { this.api({ url: "/test/tree2", method: "post", params: { id: node.data.id } }).then(data => { console.log(data); //this.defaultProps.children = data.list; return resolve(data.list); }) } } } </script>
controller层
@PostMapping("/tree") public JSONObject tree( ) {return userService.tree(); } @PostMapping("/tree2") public JSONObject tree(@RequestParam Map<String, Object> user) {return userService.tree2(user); }
service层
/** * 树 */ JSONObject tree(); /** * 树 */ JSONObject tree2(Map<String, Object> user);
serviceImpl层
@Override public JSONObject tree() { List<JSONObject> list=userDao.tree(); System.out.println(list); return CommonUtil.successPage(list); } @Override public JSONObject tree2(Map<String, Object> user) { int codept=Integer.parseInt(user.get("id").toString()) ; List<JSONObject> list=userDao.tree2(codept); return CommonUtil.successPage(list); }
dao层
/** * 树 */ List<JSONObject> tree(); List<JSONObject> tree2(@Param("codept")int codept);
mapper层
<select resultType="com.alibaba.fastjson.JSONObject"> SELECT [id] ,[codept] ,[name] FROM [dbo].[Dept] WHERE codept ='0' </select> <select resultType="com.alibaba.fastjson.JSONObject"> SELECT [id] ,[codept] ,[name] FROM [dbo].[Dept] WHERE codept =#{codept} </select>
总结
以上所述是小编给大家介绍的vue+element树组件 实现树懒加载的过程详解,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对脚本之家网站的支持!
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