0

我正在尝试在 angular2 中具有搜索功能。

到目前为止,我已经为此创建了自己的自定义管道,如下所示:

搜索.pipe.ts

import { Pipe, PipeTransform ,Injectable} from '@angular/core';

@Pipe({
    name: 'search',
    pure: false
})
@Injectable()
export class SearchPipe implements PipeTransform {
    transform(components: any[], args: any): any {
        var val = args[0];
        if (val !== undefined) {
            var lowerEnabled = args.length > 1 ? args[1] : false;

            // filter components array, components which match and return true will be kept, false will be filtered out
            return components.filter((component) => {
                if (lowerEnabled) {
                    return (component.name.toLowerCase().indexOf(val.toLowerCase()) !== -1);
                } else {
                    return (component.name.indexOf(val) !== -1);
                }
            });
       }
       return components;
    }
}

在这样做之后,我试图在 html 中应用这个管道,如下所示:

*ngFor="let aComponent of selectedLib.componentGroups[groupCounter].components | search:searchComp:true"

它给了我以下错误:

TypeError:无法读取未定义的属性“0”

当我不应用 pipe 时, *ngFor 会正确打印数组元素,但是一旦我在 html 中应用搜索管道,它就会给我上述错误。

任何输入?

4

1 回答 1

0

RC 中的新管道接受多个参数,而不仅仅是一个数组:

transform(components: any[], searchComponent: any, caseInsensitive: boolean): any {
    if (searchComponent !== undefined) {
        // filter components array, components which match and return true will be kept, false will be filtered out
        return components.filter((component) => {
            if (caseInsensitive) {
                return (component.name.toLowerCase().indexOf(searchComponent.toLowerCase()) !== -1);
            } else {
                return (component.name.indexOf(searchComponent) !== -1);
            }
        });
   }
   return components;
}
于 2016-07-05T11:05:52.603 回答