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API / @angular/common

KeyValuePipe

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

{{ input_expression | keyvalue [ : compareFn ] }}

输入值

inputnull | { [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.

Examples

This examples show how an Object or a Map and 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']]); }