屬性“值”在元素類型上不存在

Question

我試圖總結使用輸入在mat-table列中輸入的值。

我創建了一個包含3列的表格： Account Id ， Account Description和Value 。 我還在資產文件夾中用acc_id和acc_desc的值創建了一個JSON文件。

然后，我在表格中訪問相應列的這些值。

我還創建了一個Value列，並為其分配了輸入字段。

在表格旁邊，我采用了一個簡單的網格，其中包含兩個圖塊，我想將在“ Value列中輸入的所有值的總和。

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">
     <ng-container>
       <input  [(ngModel)]="element.value">
     </ng-container> 
   </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 style="align-self: left;"> Total</mat-grid-tile>
  <mat-grid-tile>{{calculation()}}</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 {

element: string;
value: any;
constructor( private accdetailservice: AccountdetailService ) { }


  /* Table Starts here
  ---------------------- */

 displayedColumns1 = ['acc_id', 'acc_des', 'value'];
 dataSource1= new MatTableDataSource<Element>(ELEMENT_DATA);


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

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

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';

import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
import { ReactiveFormsModule,FormsModule } from '@angular/forms';
import { HttpModule} from '@angular/http';

import { AppMaterialModule } from './app-material.module';


import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';
import { AccountComponent } from './account/account.component';

import { AccountdetailService } from './accountdetail.service';


@NgModule({
  declarations: [
    AppComponent,
    AccountComponent    
  ],
  imports: [
    BrowserModule,
    AppRoutingModule,
    ReactiveFormsModule,
    BrowserAnimationsModule,
    AppMaterialModule,
    FormsModule ,
    HttpModule   
  ],
  entryComponents:[ ],

  providers: [ AccountdetailService],
  bootstrap: [AppComponent]
})
export class AppModule { }

我可以對在“值”列中輸入的值進行匯總，但是出現以下錯誤。

有人可以告訴我如何在表中使用value屬性而不在Element中定義它嗎 ？

這是我的輸出。

Answer 1

在您的ngOnInit函數中嘗試此ngOnInit 。 您需要動態創建value屬性。

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