Question

我正在Todo内查看此bit of code that is the model for a select filter component：

    export enum VISIBILITY_FILTER {
      SHOW_COMPLETED = 'SHOW_COMPLETED',
      SHOW_ACTIVE = 'SHOW_ACTIVE',
      SHOW_ALL = 'SHOW_ALL'
    }

    export type TodoFilter = {
      label: string;
      value: VISIBILITY_FILTER;
    };

    export const initialFilters: TodoFilter[] = [
      { label: 'All', value: VISIBILITY_FILTER.SHOW_ALL },
      { label: 'Completed', value: VISIBILITY_FILTER.SHOW_COMPLETED },
      { label: 'Active', value: VISIBILITY_FILTER.SHOW_ACTIVE }
    ];

似乎所有这些都可以替换为：

export enum VISIBILITY_FILTER {
  SHOW_COMPLETED = 'Completed',
  SHOW_ACTIVE = 'Active',
  SHOW_ALL = 'All'
}

因此，active过滤器属性将仅由枚举VISIBILITY_FILTER键入，我们将在模板中依次遍历枚举，如下所示（伪代码）：

    <option *ngFor="let filter of VISIBILITY_FILTER;" [ngValue]="filter">{{VISIBILITY_FILTER[VISIBILITY_FILTER.filter]}}
    </option>

这看起来合理还是我错过了什么？

Answer 1

尝试：

public get visFilterValues() {
  return Object.keys(VISIBILITY_FILTER).map(k => VISIBILITY_FILTER[k]);
}

和

<option *ngFor="let filter of visFilterValues" [ngValue]="filter">{{filter}}</option>

Angular的循环模板可以遍历枚举吗？

1 个答案: