按日期过滤列表数据 angular 4

Question

我有一个包含用户生日的列表。我想显示从现在开始生日为 1 的用户列表。

我想显示从今天起一周内生日的用户列表。

我的清单就像

`<nb-list-item *ngFor="let yuvak of yuvaklist | slice:startDate:endDate ">
      {{yuvak.dateofbirth}}
      {{yuvak.firstname}} + + {{yuvak.lastname}}
  </nb-list-item>`

Answer 1

下面的简单示例：

let weekSec = 7 * 24 * 60 * 60 * 1000;
let today = new Date();
let birthday = new Date('1995-11-22');
birthday.setFullYear(today.getFullYear());
if (birthday.getTime() < today.getTime() && birthday.getTime() + weekSec > today.getTime()) {
  console.log('Happy birthday');
} else {
  console.log('...');
}

Answer 2

同意@incNick 代码，但我们应该将其包装在 Pipe 中。您可以像这样创建 Angular 管道过滤器。

从“@angular/core”导入{管道、管道转换}；

@Pipe({
    name: 'birthdayFilter',
    pure: false
})

export class FilterPipe implements PipeTransform {
    transform(items: any[], args: any[]): any {
        return items.filter(item => this.isBirthdayInaWeek(item.birthday));
    }

    isBirthdayInaWeek(birthday){
        let weekSec = 7 * 24 * 60 * 60 * 1000;
        let today = new Date();
        let birthday = new Date(birthday);
        birthday.setFullYear(today.getFullYear());
        if (birthday.getTime() < today.getTime() && birthday.getTime() + weekSec > today.getTime()) {
            return true;
        } else {
           return false;
        }
    }
}

模板：

<nb-list-item *ngFor="let yuvak of yuvaklist | birthdayFilter ">
      {{yuvak.dateofbirth}}
      {{yuvak.firstname}} + + {{yuvak.lastname}}
  </nb-list-item>

按日期过滤列表数据 angular 4

Filter list data by dates in angular 4

angular

angular-pipe