我已经添加了表单输入,可以按年龄范围过滤用户。为此创建了管道。现在,我尝试在工作示例中实现该目标,在该示例中,使用其他管道根据其他形式过滤结果。在这个工作示例中,如何使用年龄范围的管道并使这两个管道一起工作?这是代码:
年龄段管道
transform(value: any, args?: any): any
{ if(!args) return value;
return value.filter( item => item.age > args[0] && item => item.age < args[1])
);
}
其中args [0]是最小值,而args [1]最大值。
工作搜索示例的管道
import { Pipe, PipeTransform } from '@angular/core';
@Pipe({
name: 'filter',
})
export class FilterPipe implements PipeTransform {
transform(items: any[], value: string, prop: string): any[] {
if (!items) return [];
if (!value) return items;
return items.filter(singleItem =>
singleItem[prop].toLowerCase().includes(value.toLowerCase())
);
}
}
工作示例的TypeScript
form: FormGroup;
@Output() autoSearch: EventEmitter<string> = new EventEmitter<string>();
@Output() groupFilters: EventEmitter<any> = new EventEmitter<any>();
searchText: string = '';
constructor(private fb: FormBuilder,
private userService: UserService) {}
ngOnInit(): void {
this.buildForm();
}
buildForm(): void {
this.form = this.fb.group({
name: new FormControl(''),
prefix: new FormControl(''),
position: new FormControl(''),
gender: new FormControl(''),
agefrom: new FormControl(''),
ageto: new FormControl('')
});
}
search(filters: any): void {
Object.keys(filters).forEach(key => filters[key] === '' ? delete filters[key] : key);
this.groupFilters.emit(filters);
}
}
HTML
<form novalidate
[formGroup]="form">
<h3>Group Filter</h3>
<div class="row">
<div class="col-md-3">
<input type="text"
formControlName="name"
class="form-control"
placeholder="name"
#searchName
/>
</div>
<div class="col-md-3">
<input type="text"
formControlName="agefrom"
class="form-control"
placeholder="age from"
#searchName
/>
</div>
<div class="col-md-3">
<input type="text"
formControlName="nageto"
class="form-control"
placeholder="age to"
#searchName
/>
</div>
<div class="col-md-3 col-sm-3">
<select class="form-control"
formControlName="prefix">
<option value="">Prefix</option>
<option value="MR">MR</option>
<option value="MS">MS</option>
</select>
</div>
<div class="col-md-3 col-sm-3">
<select class="form-control"
formControlName="position">
<option value="">Position</option>
<option value="admin">admin</option>
<option value="student">student</option>
</select>
</div>
<div class="col-md-3 col-sm-3">
<select class="form-control"
formControlName="gender">
<option value="">Gender</option>
<option value="M">male</option>
<option value="F">female</option>
</select>
</div>
<div class="col-md-3 col-sm-3">
<button class="btn btn-primary"
(click)="search(form.value)">Search</button>
</div>
</div>
</form><br/>
有关完整代码示例,您可以在此处查看: https://stackblitz.com/edit/ng6-multiple-search-values-smz1cb-solved-jx6kgc?file=src%2Fapp%2Fuser%2Ffilter.pipe.ts
如何在代码中实现该年龄段管道并将其作为本工作示例的一部分?
答案 0 :(得分:2)
我解决了您的问题,但不使用管道,而是在您在(user-list.component.ts)中创建的过滤器函数中进行了逻辑处理,您可以在此处进行检查:
希望我的回答对您有帮助