Angular 2 创建自定义管道
示例
app/pipes.pipe.ts
import { Pipe, PipeTransform } from '@angular/core';
@Pipe({name: 'truthy'})
export class Truthy implements PipeTransform {
transform(value: any, truthy: string, falsey: string): any {
if (typeof value === 'boolean'){return value ? truthy : falsey;}
else return value
}
}app/my-component.component.ts
import { Truthy} from './pipes.pipe';
@Component({
selector: 'my-component',
template: `
<p>{{value | truthy:'enabled':'disabled' }}</p>
`,
pipes: [Truthy]
})
export class MyComponent{ }