我在一个组件下面的代码:如何在组件中显示观察项?
ngOnInit(): void
{
const source = this.categoryService.getCategories();
const sourceedit = source.subscribe(aff => console.log(aff));
const example = source.map((categor) => categor.map((categories) => {
const links = this.categoryService.countCategoryLinks(categories.id)
.subscribe(valeur => console.log(valeur));
return categories.id
}));
const categories = example.subscribe(val => console.log("valeur: "+val));
}
在我的.ts模板文件,我有以下几点:
<tr *ngFor="let category of categories | async; let id = index">
<td>
<label class="mdl-checkbox mdl-js-checkbox mdl-js-ripple-effect mdl-data-table__select" for="row[3]">
<input type="checkbox" id="row[3]" class="mdl-checkbox__input"/>
</label>
</td>
<td class="mdl-data-table__cell--non-numeric"><a [routerLink]="['/category/links']"></a>{{category.categoryName }}
</td>
<td class="mdl-data-table__cell--non-numeric">{{category.categoryName}}
</td>
<td #category.id><i (click)="deleteCategory(id)" class="material-icons">delete</i>
</td>
</tr>
并没有显示任何内容。 我想在表格中显示类别和计数结果。
在此先感谢和诚挚的问候
你好,对于类别书面方式 '' this.categories =此.categoryService.getCategories();''就够了。谢谢 –