如何使用angular2中的mat-input来汇总在mat-table列中输入的值

Question

我正在尝试使用输入总结在public void openbrowser(String browsername, String URL){ if(browsername.equalsIgnoreCase("broserstack")){ browserstack_setup(); }else if(browsername.equalsIgnoreCase("CH")){ System.setProperty("webdriver.chrome.driver",chromedriverpath); driver=new ChromeDriver(); driver.get(URL); } } 列中输入的值。

我创建了一个包含3列的表格：mat-table，Account Id和Account Description。我还在assets文件夹中创建了一个JSON文件，其中包含Value和acc_id的值。

然后我在表格中为各列访问这些值。

我还创建了一个acc_desc列，我为其分配了输入字段。

在表格旁边，我采用了一个带有两个图块的简单网格，我想在Value列中输入所有值的总和。

Value

account.component.html

<!-- Table starts here --> <mat-card> <div class="example-container mat-elevation-z8"> <mat-table #table [dataSource]="dataSource1"> <!-- Account No. Column --> <ng-container matColumnDef="acc_id"> <mat-header-cell *matHeaderCellDef> Account ID. </mat-header-cell> <mat-cell *matCellDef="let element">{{element.acc_id}}</mat-cell> </ng-container> <!-- Account Description Column --> <ng-container matColumnDef="acc_des"> <mat-header-cell *matHeaderCellDef> Account Description </mat-header-cell> <mat-cell *matCellDef="let element">{{element.acc_des }} </mat-cell> </ng-container> <!-- Value Column --> <ng-container matColumnDef="value"> <mat-header-cell *matHeaderCellDef> Value </mat-header-cell> <mat-cell *matCellDef="let element"><input matInput value=0> </mat-cell> </ng-container> <mat-header-row *matHeaderRowDef="displayedColumns1" ></mat-header-row> <mat-row *matRowDef="let row; columns: displayedColumns1;" > </mat-row> </mat-table> <mat-grid-list cols="2" rowHeight="20:1"> <mat-grid-tile> Total</mat-grid-tile> <mat-grid-tile> {{dataSource1.data.reduce((summ, v) => summ += v.value, 0)}} </mat-grid-tile> </mat-grid-list> </div> </mat-card>

account.component.ts

import {Component, OnInit} from '@angular/core'; import { Observable } from 'rxjs/Observable'; import 'rxjs/add/operator/map'; import { ReactiveFormsModule, FormGroup,FormControl } from '@angular/forms'; import { MatTableDataSource} from '@angular/material'; import { AccountdetailService } from '../accountdetail.service'; @Component({ selector: 'app-account', templateUrl: './account.component.html', styleUrls: ['./account.component.scss'] }) export class AccountComponent implements OnInit { constructor( private accdetailservice: AccountdetailService ) { } /* Table Starts here ---------------------- */ displayedColumns1 = ['acc_id', 'acc_des', 'value']; dataSource1= new MatTableDataSource<Element>(ELEMENT_DATA); ngOnInit(){ this.accdetailservice.accountdetails() .subscribe(data => this.dataSource1.data = data; ); } } const ELEMENT_DATA: Element[] = [];

accountdetails.service.ts

import { Injectable } from '@angular/core'; import { Http } from '@angular/http'; import 'rxjs/add/operator/map'; @Injectable() export class AccountdetailService { constructor(private http:Http ) { } accountdetails() { return this.http.get('/assets/accountdetails.json') .map(result => result.json()); }}

accountdetails.json

[ { "acc_id": 1001, "acc_des": "aaa" }, { "acc_id": 1002, "acc_des": "aaa" } ]

app.module.ts

如何总结我的值并在网格图块中显示总和？ 我收到以下错误...

Answer 1

尝试减速机：

<mat-grid-tile> Total: {{dataSource1.data.reduce((summ, v) => summ += v.value, 0)}}</mat-grid-tile>

Answer 2

试试这个

在组件

中

 ngOnInit(){
  this.accdetailservice.accountdetails()
  .subscribe(data =>
  this.dataSource1.data= data.map(obj => ({...obj, value: 0}))
  );
 }


calculation(){ 
return dataSource1.data.reduce((summ, v) => summ += parseInt(v.value), 0) 
}

in Html

<mat-grid-tile> Total: {{calculation()}}</mat-grid-tile>

也将<input matInput value=0>更改为<input matInput value="element.value"/>

编辑：

根据聊天讨论，您需要使用value参数作为动态参数来计算

请尝试以下方式

<ng-container matColumnDef="value">
   <mat-header-cell *matHeaderCellDef> Value </mat-header-cell>
   <mat-cell *matCellDef="let element">
     <ng-container>
       <input  [(ngModel)]="element.value">
     </ng-container>
   </mat-cell>
    </ng-container>