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API > @angular/common

KeyValuePipe

Transforms Object or Map into an array of key value pairs.

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{{ input_expression | keyvalue [ : compareFn ] }}
      
      {{ input_expression | keyvalue [ : compareFn ] }}

NgModule

输入值

input { [key: string]: V; [key: number]: V; } | Map

参数

compareFn (a: KeyValue, b: KeyValue) => number

可选. 默认值是 defaultComparator.

说明

The output array will be ordered by keys. By default the comparator will be by Unicode point value. You can optionally pass a compareFn if your keys are complex types.

使用说明

Examples

This examples show how an Object or a Map can be iterated by ngFor with the use of this keyvalue pipe.

@Component({ selector: 'keyvalue-pipe', template: `<span> <p>Object</p> <div *ngFor="let item of object | keyvalue"> {{item.key}}:{{item.value}} </div> <p>Map</p> <div *ngFor="let item of map | keyvalue"> {{item.key}}:{{item.value}} </div> </span>` }) export class KeyValuePipeComponent { object: {[key: number]: string} = {2: 'foo', 1: 'bar'}; map = new Map([[2, 'foo'], [1, 'bar']]); }
      
      @Component({
  selector: 'keyvalue-pipe',
  template: `<span>
    <p>Object</p>
    <div *ngFor="let item of object | keyvalue">
      {{item.key}}:{{item.value}}
    </div>
    <p>Map</p>
    <div *ngFor="let item of map | keyvalue">
      {{item.key}}:{{item.value}}
    </div>
  </span>`
})
export class KeyValuePipeComponent {
  object: {[key: number]: string} = {2: 'foo', 1: 'bar'};
  map = new Map([[2, 'foo'], [1, 'bar']]);
}