使用效果
前端代码
定义interface
代码语言:javascript复制export interface TreeDataItem {
value: string;
key: string;
title?: string;
slots?: Record<string, string>;
children?: TreeDataItem[];
};
加载数据
代码语言:javascript复制//测试计划选择树
constsampleTreeData = ref<TreeDataItem[]>();
//加载树数据
loadSampleTreeData();
//方法定义
function loadSampleTreeData(){
sampleTree(null).then(result => {
sampleTreeData.value = result;
}).finally(() => {
})
}
后端代码
定义treeVO
代码语言:javascript复制@Data
public class PlantSampleTreeVO {
//key
private String key;
//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
private List<PlantSampleTreeVO> children;
}
controller提供数据
代码语言:javascript复制@Override
public List<PlantSampleTreeVO> getPlantSampleTreeVO() {
List<PlantSampleTreeVO> plantSampleTreeVOList = new ArrayList<>();
//查询所在班组,plant member
List<Plant> plantList = plantService.list();
//循环查询各班组相关的样品组模板
for(Plant plant : plantList) {
//创建顶层树/节点
PlantSampleTreeVO plantNode = new PlantSampleTreeVO();
plantNode.setKey(plant.getId());
plantNode.setValue(plant.getId());
plantNode.setTitle(plant.getPlantName());
plantNode.setChildren(new ArrayList<>());
plantSampleTreeVOList.add(plantNode);
//查询班组相关的样品组模板
QueryWrapper<SampleGroupTemplate> sampleGroupTemplateQueryWrapper = new QueryWrapper<>();
sampleGroupTemplateQueryWrapper.eq("plantid",plant.getId());
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
PlantSampleTreeVO sampleGroupNode = new PlantSampleTreeVO();
sampleGroupNode.setKey(sampleGroupTemplate.getId());
sampleGroupNode.setValue(sampleGroupTemplate.getId());
sampleGroupNode.setTitle(sampleGroupTemplate.getSampleGroupName());
sampleGroupNode.setChildren(new ArrayList<>());
plantNode.getChildren().add(sampleGroupNode);
//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",sampleGroupTemplate.getId());
List<SgtSample> sampleList = this.list(sampleQueryWrapper);
//循环各样品
for(SgtSample sample: sampleList) {
PlantSampleTreeVO sampleNode = new PlantSampleTreeVO();
sampleNode.setKey(sample.getId());
sampleNode.setValue(sample.getId());
sampleNode.setTitle(sample.getSampleName());
sampleNode.setChildren(new ArrayList<>());//序列化为[]而非null,或需要配置序列化时null的节点不添加
sampleGroupNode.getChildren().add(sampleNode);
}
}
}
return plantSampleTreeVOList;
}
应用说明
适用于少量数据,大量数据应异步加载。 如一次加载树节点全部数据时,不宜使用循环查询的方式,应使用三个查询,然后将查询处的数据在service层中进行处理构建tree数据结构。