Question

我正在开发一个项目，该项目正在Angular 8中实现，后端使用Java（Spring Boot 2）。项目假定具有类别和子类别。获取类别没有问题，但我只是不知道如何获得一个子类别。

从Web浏览器的级别来看，我具有以下类别和子类别列表：

[{"categories_id":1,"categoriesName":"Category1","subCategories": 
[{"id":1,"subCatName":"subcat1"},{"id":2,"subCatName":"subcat2"}, 
{"id":4,"subCatName":"subcat3"}],"id":1}, 
{"categories_id":2,"categoriesName":"Category2","subCategories": 
[{"id":3,"subCatName":"subcat3"},{"id":5,"subCatName":"subcat5"}],"id":2}, 
{"categories_id":3,"categoriesName":"Category3","subCategories":[],"id":3}, 
{"categories_id":4,"categoriesName":"Category4","subCategories":[],"id":4}]

在Angular中，我创建了一个接口文件CatSubCat.ts，其内容为：

export interface ICatSubCat {

categories_id: number;
id: number;
categoriesName: string;
subCatName: string;

}

Service包含一种从后端获取类别和子类别的方法：

 getCategories() : Observable<ICatSubCat[]> {
 // getCategories() : any { 

 return this.http.get<ICatSubCat[]>(this.categories);

 }

在

    main.component.ts

我声明了变量：

   public catsubcat:ICatSubCat[] = [];
   public categories_id:number;
   public categoriesName:string;
   public catId:number;
   public subCatName:string;

并从服务订阅了该方法：

   catSubCat() {

this.info.getCategories().subscribe (

    catsubcat => {


     // for (let i=0; catsubcat.length <= 5; i++) {
       for (let i in catsubcat) {
     // this.categoriesName = catsubcat[0].categoriesName

      this.categoriesName = catsubcat[i].categoriesName
      this.categories_id = catsubcat[i].categories_id;
      this.catId = this.categories_id;

         console.log(this.categoriesName);
       }
     // this.categoriesName = catsubcat[i].categoriesName

      }



     // console.log(catsubcat);

     // console.log(this.categoriesName);
   // }
)
}

但是我不知道如何获得一个类别的单个子类别。我可以请您指出我该怎么做吗？

谢谢。

angular8-获取类别子类别的问题

0 个答案: