如何使用angular2中的mat-input总结在mat-table列中输入的值 [英] How to sum up the values entered in the mat-table column using mat-input in angular2

问题描述

我正在尝试使用输入对 mat-table 列中输入的值求和.

我创建了一个包含 3 列的表:Account Id、Account Description 和 Value.我还在 assets 文件夹中创建了一个 JSON 文件，其中包含 acc_id 和 acc_desc 的值.

然后我在我的表中为相应的列访问这些值.

我还创建了一个 Value 列，我为其分配了输入字段.

在表格旁边，我使用了一个带有两个图块的简单网格，我想在其中计算 Value 列中输入的所有值的总和.

account.component.html

<!-- 表格从这里开始--><垫卡><div class="example-container mat-elevation-z8"><mat-table #table [dataSource]="dataSource1"><!-- 账号栏--><ng-container matColumnDef="acc_id"><mat-h​​eader-cell *matHeaderCellDef>帐户ID.</mat-h​​eader-cell><mat-cell *matCellDef="let element">{{element.acc_id}}</mat-cell></ng-容器><!-- 账户描述栏--><ng-container matColumnDef="acc_des"><mat-h​​eader-cell *matHeaderCellDef>账户描述 </mat-h​​eader-cell><mat-cell *matCellDef="let element">{{element.acc_des }} </mat-cell></ng-容器><!-- 值列--><ng-container matColumnDef="value"><mat-h​​eader-cell *matHeaderCellDef>值</mat-h​​eader-cell><mat-cell *matCellDef="let element"><input matInput value=0></mat-cell></ng-容器><mat-h​​eader-row *matHeaderRowDef="displayedColumns1" ></mat-h​​eader-row><mat-row *matRowDef="让行；列:displayColumns1;"></mat-row></mat-table><mat-grid-list cols="2" rowHeight="20:1"><mat-grid-tile>总计</mat-grid-tile><mat-grid-tile>{{dataSource1.data.reduce((summ, v) => summ += v.value, 0)}} </mat-grid-tile></mat-grid-list>

</mat-card>

account.component.ts

import {Component, OnInit} from '@angular/core';从 'rxjs/Observable' 导入 { Observable };导入 'rxjs/add/operator/map';从@angular/forms"导入 { ReactiveFormsModule, FormGroup,FormControl };从@angular/material"导入{ MatTableDataSource}；从 '../accountdetail.service' 导入 { AccountdetailService };@成分({选择器:'应用程序帐户'，templateUrl: './account.component.html',styleUrls: ['./account.component.scss']})导出类 AccountComponent 实现 OnInit {构造函数(私人accdetailservice:AccountdetailService){}/* 表格从这里开始--------------- */displayColumns1 = ['acc_id', 'acc_des', 'value'];dataSource1= new MatTableDataSource(ELEMENT_DATA);ngOnInit(){this.accdetailservice.accountdetails().订阅(数据=>this.dataSource1.data = 数据；);}}const ELEMENT_DATA: 元素[] = [];

accountdetails.service.ts

import { Injectable } from '@angular/core';从 '@angular/http' 导入 { Http };导入 'rxjs/add/operator/map';@Injectable()导出类 AccountdetailService {构造函数(私有 http:Http){}帐户详细资料(){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';从'@angular/platform-b​​rowser' 导入 { BrowserModule };从@angular/platform-b​​rowser/animations"导入 { BrowserAnimationsModule };从 '@angular/forms' 导入 { ReactiveFormsModule,FormsModule };从'@angular/http'导入{HttpModule}；import { AppMaterialModule } from './app-material.module';import { AppRoutingModule } from './app-routing.module';从 './app.component' 导入 { AppComponent };从 './account/account.component' 导入 { AccountComponent };从 './accountdetail.service' 导入 { AccountdetailService };@NgModule({声明: [应用组件，帐户组件],进口:[浏览器模块，应用路由模块，反应形式模块，浏览器动画模块，应用材料模块，表单模块，Http模块],入口组件:[ ],提供者:[AccountdetailService]，引导程序:[AppComponent]})导出类 AppModule { }

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...

解决方案

试试这个

在组件中

 ngOnInit(){this.accdetailservice.accountdetails().订阅(数据=>this.dataSource1.data= data.map(obj => ({...obj, value: 0})));}计算(){return dataSource1.data.reduce((summ, v) => summ += parseInt(v.value), 0)}

在 HTML 中

总计:{{calculation()}}</mat-grid-tile>

也将 改为

根据聊天讨论，您需要使用值参数作为动态参数来计算

所以试试下面的方法

<mat-h​​eader-cell *matHeaderCellDef>值</mat-h​​eader-cell><mat-cell *matCellDef="let element"><ng-容器><input [(ngModel)]="element.value"></ng-容器></mat-cell></ng-容器>

I am trying to sum up the values entered in the mat-table column using an input.

I have created a table with 3 columns: Account Id, Account Description and Value. I have also created a JSON file in the assets folder with the values for acc_id and acc_desc .

I then access these values in my table for the respective columns.

I have also created a Value column for which i have assigned input field.

Next to the table i took a simple grid with two tiles where i want to take the sum of all the values entered in the Value column.

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

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 { }

How can i sum up my values and display the sum in the grid tile? I am getting the below error...

解决方案

try this

In component

 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>

also change <input matInput value=0> to <input matInput value="element.value"/>

Edit:

as per the chat discussion you need to use value parameter as a dynamic parameter to calculate

So try this below way

<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>

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