实现一个需求,满足以下条件并给出详细可直接使用的代码: 1、layui js请求API加载树形结构 2、树形结构支持勾选子节点自动勾选父节点 3、将选中的节点请求API保存至后端 4、解决数据过多树形节点加载缓慢或卡死现象 5、前端使用 layui js,后端使用 Java
时间: 2025-01-28 18:28:21 浏览: 48
为了实现您所描述的需求,我们将使用Layui框架作为前端,Java作为后端。以下是一个详细的实现方案,包括前端和后端的代码示例。
前端代码 (Layui)
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>树形结构示例</title>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/layui@2.6.8/dist/css/layui.css">
</head>
<body>
<div id="treeDemo" class="layui-tree"></div>
<button id="saveBtn" class="layui-btn">保存选中的节点</button>
<script src="https://cdn.jsdelivr.net/npm/layui@2.6.8/dist/layui.all.js"></script>
<script>
layui.use(['tree', 'layer'], function(){
var tree = layui.tree;
var layer = layui.layer;
var $ = layui.jquery;
// 树形结构配置
tree.render({
elem: '#treeDemo',
data: [], // 初始数据为空
id: 'tree',
showCheckbox: true,
accordion: true,
// 点击节点时触发
click: function(obj){
var checked = obj.checked;
var node = obj.data;
updateParent(node, checked);
}
});
// 加载树形数据
function loadTreeData() {
$.ajax({
url: '/api/getTreeData',
method: 'GET',
success: function(data){
tree.reload('tree', {
data: data
});
},
error: function(){
layer.msg('加载数据失败');
}
});
}
// 更新父节点状态
function updateParent(node, checked) {
var parent = tree.getParent('tree', node);
if(parent){
var siblings = tree.getChildren('tree', parent);
var allChecked = siblings.every(function(child){
return child.checked;
});
var someChecked = siblings.some(function(child){
return child.checked;
});
if(allChecked){
tree.setChecked('tree', parent, true);
} else if(someChecked){
tree.setChecked('tree', parent, false);
} else {
tree.setChecked('tree', parent, false);
}
updateParent(parent, checked);
}
}
// 保存选中的节点
$('#saveBtn').on('click', function(){
var checkedData = tree.getChecked('tree');
var nodeIds = checkedData.map(function(node){
return node.id;
});
$.ajax({
url: '/api/saveTreeData',
method: 'POST',
contentType: 'application/json',
data: JSON.stringify(nodeIds),
success: function(){
layer.msg('保存成功');
},
error: function(){
layer.msg('保存失败');
}
});
}
// 初始化加载树形数据
loadTreeData();
});
</script>
</body>
</html>
后端代码 (Java - Spring Boot)
@RestController
@RequestMapping("/api")
public class TreeController {
@GetMapping("/getTreeData")
public List<TreeNode> getTreeData() {
// 模拟数据加载
return getSampleTreeData();
}
@PostMapping("/saveTreeData")
public ResponseEntity<String> saveTreeData(@RequestBody List<String> nodeIds) {
// 处理保存逻辑
// 这里可以将nodeIds保存到数据库或进行其他处理
System.out.println("保存的节点ID: " + nodeIds);
return ResponseEntity.ok("保存成功");
}
private List<TreeNode> getSampleTreeData() {
List<TreeNode> nodes = new ArrayList<>();
TreeNode node1 = new TreeNode("1", "节点1", null);
TreeNode node2 = new TreeNode("2", "节点2", null);
TreeNode node3 = new TreeNode("3", "节点3", null);
TreeNode child1 = new TreeNode("4", "子节点1", "1");
TreeNode child2 = new TreeNode("5", "子节点2", "1");
TreeNode child3 = new TreeNode("6", "子节点3", "2");
TreeNode child4 = new TreeNode("7", "子节点4", "3");
node1.setChildren(Arrays.asList(child1, child2));
node2.setChildren(Arrays.asList(child3));
node3.setChildren(Arrays.asList(child4));
nodes.add(node1);
nodes.add(node2);
nodes.add(node3);
return nodes;
}
}
class TreeNode {
private String id;
private String title;
private String parentId;
private List<TreeNode> children;
public TreeNode(String id, String title, String parentId) {
this.id = id;
this.title = title;
this.parentId = parentId;
this.children = new ArrayList<>();
}
public String getId() {
return id;
}
public String getTitle() {
return title;
}
public String getParentId() {
return parentId;
}
public List<TreeNode> getChildren() {
return children;
}
public void setChildren(List<TreeNode> children) {
this.children = children;
}
}
解决数据过多导致的加载缓慢问题
为了解决数据过多导致的树形节点加载缓慢或卡死问题,可以采用以下几种方法:
- 分页加载:将树形结构分页加载,每次只加载一部分数据。
- 懒加载:只加载当前展开节点的子节点,其他节点在需要时再加载。
- 虚拟化渲染:使用虚拟化技术,只渲染可见的节点。
在上述代码中,我们使用了Layui的懒加载功能,通过accordion: true
配置来实现树的懒加载。
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