如何使用复选框angular 2绑定数据？

时间：2019-01-02 11:54:18

标签： angular typescript angular-material angular5

JSON 

[ {
  "code" : "TEST",
  "projectId" : "PROJECT",
  "name" : "TEST",
  "description" : "test",
  "level1" : "1 ",
  "level2" : "2 ",
  "level3" : "3",
  "level4" : "4",
  "level5" : "5",
  "active" : false
}, {
  "code" : "test",
  "projectId" : "PROJECT",
  "name" : "Test",
  "description" : "test 11",
  "level1" : "1 ",
  "level2" : "2 ",
  "level3" : "3",
  "level4" : "4",
  "level5" : "5",
  "active" : true
}, {
  "code" : "asdasd2122",
  "projectId" : "PROJECT",
  "name" : "TEST12",
  "description" : "ashdasdhl",
  "level1" : "1 ",
  "level2" : "2 ",
  "level3" : "3",
  "level4" : "4",
  "level5" : "5",
  "active" : false
}, {
  "code" : "test1a",
  "projectId" : "PROJECT",
  "name" : "TEST122",
  "description" : "a,sndkajlskdjlkajd",
  "level1" : "1 ",
  "level2" : "2 ",
  "level3" : "3",
  "level4" : "4",
  "level5" : "5",
  "active" : true
}, {
  "code" : "dasdasd",
  "projectId" : "PROJECT",
  "name" : "test123123",
  "description" : "asdasdasd",
  "level1" : "1 ",
  "level2" : "2 ",
  "level3" : "3",
  "level4" : "4",
  "level5" : "5",
  "active" : true
}, 
 {
  "code" : "asdasdTES",
  "projectId" : "PROJECT",
  "name" : "TEST123",
  "description" : "asdasdasd",
  "level1" : "1 ",
  "level2" : "2 ",
  "level3" : "3",
  "level4" : "4",
  "level5" : "5",
  "active" : true
} ]

HTML 

            <mat-table [dataSource]="offersColumnRowData" matSort matSortActive="NAME">

          <ng-container matColumnDef="SELECT">
            <mat-header-cell *matHeaderCellDef> SELECT </mat-header-cell>
            <mat-cell *matCellDef="let element">
              <mat-checkbox>
              </mat-checkbox>
            </mat-cell>
          </ng-container>

          <ng-container matColumnDef="NAME">
            <mat-header-cell *matHeaderCellDef> NAME </mat-header-cell>
            <mat-cell *matCellDef="let element">{{ element.name }} </mat-cell>
          </ng-container>

          <ng-container matColumnDef="CODE">
            <mat-header-cell *matHeaderCellDef> CODE </mat-header-cell>
            <mat-cell *matCellDef="let element">{{ element.code }} </mat-cell>
          </ng-container>

          <ng-container matColumnDef="DESCRIPTION">
            <mat-header-cell *matHeaderCellDef> DESCRIPTION </mat-header-cell>
            <mat-cell *matCellDef="let element"> {{ element.description}} </mat-cell>
          </ng-container>

          <ng-container matColumnDef="CREATEDATE">
            <mat-header-cell *matHeaderCellDef> CREATEDATE </mat-header-cell>
            <mat-cell *matCellDef="let element"> </mat-cell>
          </ng-container>

          <ng-container matColumnDef="UNAME">
            <mat-header-cell *matHeaderCellDef> UNAME </mat-header-cell>
            <mat-cell *matCellDef="let element"> </mat-cell>
          </ng-container>

          <ng-container matColumnDef="ISACTIVE">
            <mat-header-cell *matHeaderCellDef> ISACTIVE </mat-header-cell>
            <mat-cell *matCellDef="let element">
              <mat-checkbox type="checkbox">
              </mat-checkbox>
            </mat-cell>
          </ng-container>

          <mat-header-row *matHeaderRowDef="offersColumns"></mat-header-row>
          <mat-row *matRowDef="let row; columns: offersColumns;" (mouseover)="row.hovered = true" (mouseout)="row.hovered = false"></mat-row>
        </mat-table>

我正在尝试将值绑定到复选框！布尔值（TRUE | FALSE）形式的值

我尝试将with绑定到复选框，但是它不起作用

说明：转到我的堆栈闪电->如果我从SELECT列中选择了任何复选框，则应该选择代码列（我只想在控制台日志中打印选择列行CODE）

2）如何将布尔值绑定到如果active为false的列名称为ISACTIVE的复选框列中，如果active为true则不选中该复选框->选中复选框！

这是我的stackblits链接，对您来说很简单！

https://stackblitz.com/edit/angular-gbf9kz-a2s4zc?file=app%2Ftable-basic-example.ts

4 个答案:

答案 0 :(得分：1)

根据要处理的复杂程度，可以采用表单方法（推荐），也可以在复选框中添加简单的更改处理程序。

组件 

selectedCodes: string[] = [];

receiveCheckboxChange(code: string, value: MatCheckboxChange) {
   console.log(code, value.checked);
   this.updateCodes(code, value.checked);
}

updateCodes(code: string, selected: boolean) {
   const inArrayIndex: number = this.selectedCodes.indexOf(code);
   if (selected && inArrayIndex === -1) {
      this.selectedCodes.push(code);
   } else if (inArrayIndex !== -1) {
      this.selectedCodes.splice(inArrayIndex, 1);
   }
}

isSelected(code: string) {
    return this.selectedCodes.indexOf(code) !== -1;
}

模板 

<ng-container matColumnDef="ISACTIVE">
    <mat-header-cell *matHeaderCellDef> ISACTIVE </mat-header-cell>
        <mat-cell *matCellDef="let element">
            <mat-checkbox type="checkbox" (change)="receiveCheckboxChange(element.code, $event)" [checked]="isSelected(element.code)">
            </mat-checkbox>
        </mat-cell>
</ng-container>

这里的关键部分是(change)="receiveCheckboxChange(element.code, $event)"-您可以从element中提供所需的任何信息，或者甚至可以将整个element对象本身提供给函数。然后，您可以根据自己的意愿去做。

然后，变量selectedCodes中将具有一组选定的代码。从那里开始，您对他们的处理取决于您。

闪电战：https://stackblitz.com/edit/angular-gbf9kz-sgtrtv

答案 1 :(得分：1)

<ng-container matColumnDef="SELECT">
                <mat-header-cell *matHeaderCellDef> SELECT </mat-header-cell>
                <mat-cell *matCellDef="let element">
                  <mat-checkbox [(ngModel)]="element.Isselected" (change)="change()">
                  </mat-checkbox>
                </mat-cell>
              </ng-container>

在ts文件中

change() {
    const result = this.offersColumnRowData.filter(x => x.Isselected == true);

console.log('result', result);
  }

json中的选定属性

"Isselected": false,
  "code" : "TEST",
  "projectId" : "PROJECT",
  "name" : "TEST",
  "description" : "test",
  "level1" : "1 ",
  "level2" : "2 ",
  "level3" : "3",
  "level4" : "4",
  "level5" : "5",
  "active" : false

答案 2 :(得分：0)

使用[已选中]和（更改）显示是否为element.active = true并更改element.active的值。并使用条件运算符显示（或不显示）element.code的值

res/raw

更新：最好使用ngModel-而不是[选中]和（更改）-

<ng-container matColumnDef="CODE">
  <mat-header-cell *matHeaderCellDef> CODE </mat-header-cell>
  <mat-cell *matCellDef="let element">
      {{ element.active?element.code:"" }} 
  </mat-cell>
</ng-container>
...
<ng-container matColumnDef="ISACTIVE">
   <mat-header-cell *matHeaderCellDef> ISACTIVE </mat-header-cell>
   <mat-cell *matCellDef="let element">
     <mat-checkbox type="checkbox" [checked]="element.active" 
                                   (change)="element.active=$event.checked">
     </mat-checkbox>
   </mat-cell>
</ng-container>

答案 3 :(得分：-1)

我更新了您的堆叠闪电战，请检查：https://stackblitz.com/edit/angular-gbf9kz-qg9fvw?file=app%2Ftable-basic-example.ts

使用[checked]="element.active"在复选框html标记上绑定数据

使用(change)="change(element)"

获取活动属性值
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