在 Angular material table 中更改时计算并显示输入字段的总计

Question

我有一个 angular material table，里面有输入字段。需要计算总数（无按钮）并显示在底部。同样当改变输入的数字时，应该重新计算和显示。它计算并显示 ts 文件中内容的总和，但当输入框中发生变化时，连接。 HTML代码

<ng-container matColumnDef="tuesday">
  <th mat-header-cell *matHeaderCellDef> tuesday </th>
  <td mat-cell *matCellDef="let transaction">
    <mat-form-field>
      <input  [(ngModel)]="transaction.tuesday" placeholder="Field Name" matInput ="number"/>
         </td>
  <td mat-footer-cell *matFooterCellDef> {{getTotalCostTuesday() | currency}} </td>
</ng-container>

TS code

  transactions: PeriodicElement[] = [
  { project: 'Hydrogen', monday:1, tuesday:2},
  { project: 'Helium',  monday:1 ,tuesday: 5 },
  { project: 'Lithium' , monday:1, tuesday: 3},
  { project: 'Beryllium' , monday:1, tuesday: 4 },

  ];
getTotalCostTuesday() {
  return this.transactions.map(t => t.tuesday
    ).reduce((acc, value) => acc + value, 0);
   
}

Answer 1

连接是因为 value（来自输入字段）是一个字符串。加法前改成数字。

getTotalCostTuesday() {
  return this.transactions.map(t => t.tuesday
    ).reduce((acc, value) => acc + parseInt(value), 0);  
}

在 Angular material table 中更改时计算并显示输入字段的总计

Calculate and display total of input field when changing in Angular material table

typescript

angular-ngmodel

angular-material

calculation

angular