在angular2中过滤数组 [英] Filtering an array in angular2

问题描述

我正在研究如何在 Angular2 中过滤数据数组.

I am looking into how to filter an array of data in Angular2.

我考虑过使用自定义管道，但我觉得这不是我想要的，因为它似乎更适合简单的表示转换，而不是过滤大量数据.

I looked into using a custom pipe, but I feel this is not what I am looking for, as it seems more geared towards simple presentation transformations rather then filtering large sets of data.

数组设置如下:

getLogs(): Array<Logs> {
        return [
            { id: '1', plate: 'plate1', time: 20 },
            { id: '1', plate: 'plate2', time: 30 },
            { id: '1', plate: 'plate3', time: 30 },
            { id: '2', plate: 'plate4', time: 30 },
            { id: '2', plate: 'plate5', time: 30 },
            { id: '2', plate: 'plate6', time: 30 }
        ];
    }

我想通过 id 过滤这个.因此，当我在搜索栏中输入1"时，它会更新以显示相应的值.

I want to filter this by id. So when I enter "1" into a search bar, it updates to display the corresponding values.

如果有关于如何做到这一点的方法，我很想知道！

If there is a method on how to do this, I would love to know!

推荐答案

使用默认管道无法做到这一点.这是默认支持的管道列表:https://github.com/angular/angular/blob/master/modules/angular2/src/common/pipes/common_pipes.ts.

There is no way to do that using a default pipe. Here is the list of supported pipes by default: https://github.com/angular/angular/blob/master/modules/angular2/src/common/pipes/common_pipes.ts.

也就是说，您可以轻松地为此类用例添加管道:

That said you can easily add a pipe for such use case:

import {Injectable, Pipe} from 'angular2/core';

@Pipe({
    name: 'myfilter'
})
@Injectable()
export class MyFilterPipe implements PipeTransform {
    transform(items: any[], args: any[]): any {
        return items.filter(item => item.id.indexOf(args[0]) !== -1);
    }
}

并使用它:

import { MyFilterPipe } from './filter-pipe';
(...)

@Component({
  selector: 'my-component',
  pipes: [ MyFilterPipe ],
  template: `
    <ul>
      <li *ngFor="#element of (elements | myfilter:'123')">(...)</li>
    </ul>
  `
})

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