2

我有一个表,我使用自定义管道成功过滤了它。过滤器基于两个输入,它们共同构成一个表单。我要添加的功能是在单击提交按钮之前不会发生过滤。所以它更像是一个搜索按钮。我发现了很多关于管道的信息,但没有关于在单击按钮时激活它们的信息。

mainpage.component.html:

<div>
  <label>Start Date:</label>
  <input type="text" [(ngModel)]="startDateValue">
</div>
  <label>End Date:</label>
  <input type="text" [(ngModel)]="endDateValue">
</div>
//'let idx=index' and 'let even=even' are used to change color of the rows but I took out that code. The 'onClick' function just takes the row and uses an EventEmitter to output it.
<tr *ngFor="let dPoint of theData | searchDates:startDateValue:endDateValue; let idx=index; let even=even;" (click)="onClick(dPoint, idx)">
  <td>{{dPoint.tDataPoint}}</td>
  <td>{{dPoint.tICCP}}</td>
  <td>{{dPoint.tStartDate}}</td>
  <td>{{dPoint.tEndDate}}</td>
</tr>
//the button that will execute the filtering
<button type="submit" class="btn icon-search" [disabled]="!secondForm.valid" (click)="submit(secondForm.value)"></button>

mainpage.component.ts:

@Component({
  selector: 'main-page',
  styleUrls: ['../app.component.css'],
  templateUrl: 'mainpage.component.html',
  providers: [DataTableService, DatePipe]
})

export class MainPageComponent implements OnInit {
  secondForm : FormGroup;
  theData:DataTable[] = [];

  constructor(fb: FormBuilder, private datePipe: DatePipe, private dataService: DataTableService, private cdRef:ChangeDetectorRef){
    this.secondForm = fb.group({
      'startDate' : [null, Validators.required],
      'endDate' : [null, Validators.required]
    }, {validator: this.endDateAfterOrEqualValidator})
  }

  getTable(): void {
    this.dataService.getTable().then(theData => this.theData = theData);
    this.cdRef.detectChanges();
  }

  submit(value: any){
      //where I'd want to trigger the filtering/pipe
  }
}

搜索-pipe.ts:

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

@Pipe({
  name: "searchDates"
})

export class SearchPipe implements PipeTransform {
  transform(value, minDate , maxDate){
    return value.filter(row => {
      return row.tStartDate >= minDate && row.tEndDate <= maxDate;
    });
  }
}
4

2 回答 2

5

您可以考虑删除管道,而是在用户单击按钮时自己过滤数据。

首先,定义表示过滤结果的第二个属性

let theFilteredData: DataTable[]

将您的绑定更改为绑定到 theFilteredData:

*ngFor="let dPoint of theFilteredData;" //rest of *ngFor not included

在提交函数中:

this.theFilteredData = this.theData.filter(row => 
      return row.tStartDate >= minDate && row.tEndDate <= maxDate);
于 2016-12-29T20:17:50.860 回答
0

您可以使用单击提交时切换的布尔值切换过滤的 for 循环:

*.html:

<div>
    <label>Start Date:</label>
      <input type="text" [(ngModel)]="startDateValue">
    </div>
    <label>End Date:</label>
      <input type="text" [(ngModel)]="endDateValue">
    </div>
    <tr *ngIf="filterToggle" *ngFor="let dPoint of theData | searchDates:startDateValue:endDateValue; let idx=index; let even=even;" (click)="onClick(dPoint, idx)">
      <td>{{dPoint.tDataPoint}}</td>
      <td>{{dPoint.tICCP}}</td>
      <td>{{dPoint.tStartDate}}</td>
      <td>{{dPoint.tEndDate}}</td>
    </tr>
    <tr *ngIf="!filterToggle" *ngFor="let dPoint of theData; let idx=index; let even=even;" (click)="onClick(dPoint, idx)">
      <td>{{dPoint.tDataPoint}}</td>
      <td>{{dPoint.tICCP}}</td>
      <td>{{dPoint.tStartDate}}</td>
      <td>{{dPoint.tEndDate}}</td>
    </tr>
    //the button that will execute the filtering
    <button type="submit" class="btn icon-search" [disabled]="!secondForm.valid" (click)="submit()"></button>
</div>

*.ts:

submit() {
  this.filterToggle = !this.filterToggle;
}

不会保留模板代码,但它应该可以工作。

另一个想法是通过管道发送一个布尔值“filterToggle”,因此除非“filterToggle”为真,否则管道本身不会过滤。因此,如果您单击提交,则切换应更改为 true,并且管道将过滤。

所以你的 *ngFor 看起来像这样:

<tr *ngFor="let dPoint of theData | searchDates:startDateValue:endDate:filterToggle; let idx = index; let even=even">
  ...
</tr>

或者,您可以只过滤您的实际数据,而不是将其通过管道。

submit(){
  this.theData = this.theData.filter(data => 
    return data.tStartDate >= this.startDateValue && data.tEndDate <= this.endDateValue);
}

所以当你点击提交时,通过过滤改变你原来的 theData 数组。您可能不得不使用确定要过滤的内容的布尔表达式。它应该只保留开始日期大于或等于您的“this.startDateValue”且小于或等于您的“this.endDateValue”的“数据”。但是,这将覆盖您原来的 theData 数组。因此,我将创建一个临时数组,以便您可以恢复为未过滤的 theData。

于 2016-12-29T20:14:00.010 回答