使用效果
初始化加载顶层节点,点击各层的>加载该节点的子节点,加载后>标识去除不再重复加载。
前端代码
vue ant-design组件
- tree-data,树节点,children方式或id、pid方式
- load-data,展开节点事件,响应该事件加载子节点
<a-tree-select v-model:value="sample" :tree-data="sampleTreeData" :load-data="onLoadSampleTreeData"
style="width: 100%" allowClear treeDataSimpleMode
:dropdown-style="{ maxHeight: '400px', overflow: 'auto' }"
placeholder="请选择测试计划/样品" >
</a-tree-select>
定义interface
- 异步加载通过id和pid匹配,因此没有children属性,替换为id何pid
- 添加level便于后端识别,如果后端为一个表内的数据且通过id和pid或parentid关联则不需要
export interface TreeDataItem {
id: string | number;
pId: string | number;
value: string;
title: string;
isLeaf?: boolean;
level: string;
}
加载(跟节点)数据
调用后端查询数据并赋值给treeData,treeData绑定控件的treeData属性。
async function loadSampleTreeRootData() {
// loading.value = true
let params = {"level":"0"};
sampleTreeNode(params).then(result => {
console.log(result)
sampleTreeData.value = sampleTreeData.value.concat(result);
}).finally(() => {
});
// loading.value = false
}
loadSampleTreeRootData()
加载(节点的子节点)数据
响应控件的load-data事件,查询要展开节点的子节点数据,并合并到treeData中,控件会根据id和pid显示层级关系。
const onLoadSampleTreeData = (treeNode: any) => {
return new Promise((resolve: (value?: unknown) => void) => {
// console.log("node:");
// console.log(treeNode.dataRef)
const { id,level,value } = treeNode.dataRef;
// console.log("id:"+id);
// console.log("level:"+level);
// console.log("value:"+value);
setTimeout(() => {
let nextLevel = "1";
if(level=="1")nextLevel="2";
let params = {"level":nextLevel, "id":id};
sampleTreeNode(params).then(result => {
// console.log("result:");
// console.log(result);
sampleTreeData.value = sampleTreeData.value.concat(result);
}).finally(() => {
});
resolve();
}, 300);
});
};
后端代码
定义treeNodeVO
pId和isLeaf注解下,避免springMVC默认的序列化。
(默认序列化为pid\leaf)
@Data
public class PlantSampleTreeNodeVO {
//key
private String id;
// private long id;
@JsonProperty("pId")
private String pId;
// private long pId;
//树节点显示的内容
private String title;
//默认根据此属性值进行筛选(其值在整个树范围内唯一)
private Object value;
//是否是叶子节点
@JsonProperty("isLeaf")
private boolean isLeaf;
//节点层级
private String level;
}
controller提供数据
因为是异步加载,三个表的查询可在一个service中实现,或直接使用各自的treeNode的service。
@Override
public List<PlantSampleTreeNodeVO> getPlantSampleTreeNodeVO(String level, String id) {
List<PlantSampleTreeNodeVO> plantSampleTreeVONodeList = new ArrayList<>();
switch (level) {//顶级节点
case "0":
//查询所在班组,plant member
List<Plant> plantList = plantService.list();
for (Plant plant : plantList) {
//创建顶层树/节点
PlantSampleTreeNodeVO plantNode = new PlantSampleTreeNodeVO();
// System.out.println(plant.getId());
// System.out.println(Long.parseLong(plant.getId()));
// System.out.println(Long.valueOf(plant.getId()).longValue());
// plantNode.setId(Long.parseLong(plant.getId()));
plantNode.setId(plant.getId());
plantNode.setPId("0");//and-design tree指定的值
plantNode.setValue(plant.getId());
plantNode.setTitle(plant.getPlantName());
plantNode.setLeaf(false);//需根据业务逻辑判断是否有子节点,省略处理
plantNode.setLevel("0");
plantSampleTreeVONodeList.add(plantNode);
}
break;
case "1":
//查询班组相关的样品组模板
QueryWrapper<SampleGroupTemplate> sampleGroupTemplateQueryWrapper = new QueryWrapper<>();
sampleGroupTemplateQueryWrapper.eq("plantid",id);
List<SampleGroupTemplate> sampleGroupTemplateList = sampleGroupTemplateService.list(sampleGroupTemplateQueryWrapper);
//循环各样品组模板显示其下的测试计划/样品
for(SampleGroupTemplate sampleGroupTemplate: sampleGroupTemplateList){
//添加到树上
PlantSampleTreeNodeVO sampleGroupNode = new PlantSampleTreeNodeVO();
// sampleGroupNode.setId(Long.parseLong(sampleGroupTemplate.getId()));
sampleGroupNode.setId(sampleGroupTemplate.getId());
// sampleGroupNode.setPId(Long.parseLong(id));
sampleGroupNode.setPId(id);
sampleGroupNode.setValue(sampleGroupTemplate.getId());
sampleGroupNode.setTitle(sampleGroupTemplate.getSampleGroupName());
sampleGroupNode.setLeaf(false);
sampleGroupNode.setLevel("1");
plantSampleTreeVONodeList.add(sampleGroupNode);
}
break;
case "2":
//查询样品组模板显示其下的测试计划/样品
QueryWrapper<SgtSample> sampleQueryWrapper = new QueryWrapper<>();
sampleQueryWrapper.eq("templateid",id);
List<SgtSample> sampleList = this.list(sampleQueryWrapper);
//循环各样品
for(SgtSample sample: sampleList) {
PlantSampleTreeNodeVO sampleNode = new PlantSampleTreeNodeVO();
// sampleNode.setId(Long.parseLong(sample.getId()));
sampleNode.setId(sample.getId());
// sampleNode.setPId(Long.parseLong(id));
sampleNode.setPId(id);
sampleNode.setValue(sample.getId());
sampleNode.setTitle(sample.getSampleName());
sampleNode.setLeaf(true);//叶子节点
sampleNode.setLevel("2");
plantSampleTreeVONodeList.add(sampleNode);
}
break;
}
return plantSampleTreeVONodeList;
}