Question

我做了一个PIPE如下：

import {Pipe, PipeTransform} from '@angular/core';
import { Radio } from '../../models/radio';
@Pipe({
    name: 'radioFilter'
})
export class radioFilterPipe  implements PipeTransform {

    transform(value: Radio[], args: string[]): any {

        let filter = args[0].toLocaleLowerCase();
        return filter ? value.filter(radio => radio.station.text.toLocaleLowerCase().indexOf(filter) != -1) : value;
    }
}

在我的组件中添加了以下代码：

import { radioFilterPipe } from './grid.station.pipe';

 pipes: [radioFilter],

但是我收到编译错误：错误TS2304：找不到名称＆＃39; radioFilter＆＃39;。我做错了什么？

Answer 1

根据Angular 2最终版本，您必须将Pipe，Component，Directive添加到declarations元数据的NgModule选项中。

@NgModule({
     declarations: [MyDirective, MyComponent, radioFilterPipe ],
     providers: [radioFilterPipe], //<-- Include pipe here if you want to use it in class as dependency
     imports: [ AppModule]
})

在pipe数组中包含pipes名称时，它应该是类名radioFilterPipe

import { radioFilterPipe } from './grid.station.pipe';

@Component({
  ..,
  pipes: [radioFilterPipe ],
  ..
})

Angular2 Pipe无法找到名称

1 个答案: