角度复选框列表不起作用

Question

我想创建一个复选框列表，如下所示。我想显示一个复选框和名称，并在提交时我希望获得所有选定的值。我无法显示名称并在复选框上设置所选值。

[] Jim 
[x] Mondo
[] Ann

我创建了这段代码：

  <div *ngIf="formSubmitted && teamForm.pristine" class = "submitted"> Form submitted successfully. </div>
<div class="team">
  <form [formGroup]="teamForm" (ngSubmit)="onFormSubmit()">
    <div class="all-emp">
      <b> Employees in Team :{{empFormArray.controls.length}}</b><br><br>
      <div formArrayName="empFormArray"> 
        <div *ngFor = "let emp of empFormArray.controls; let idx = index" [formGroupName]="idx" class="employee">
          <p> <b>Employee : {{idx + 1}}</b> </p>
            <p>Emp Id : <input type="checkbox" [value]="emp.isSelected"  formControlName="name">{{emp.name}}</p>
        </div>
      </div>

    </div> <br/>
 <button [disabled]="teamForm.invalid">SUBMIT</button>

这是我的组件类。请检查我的员工方法：

export class CheckboxlistComponent implements OnInit {

  teamForm:FormGroup;
  formSubmitted = false;

  constructor(
       private formBuilder:FormBuilder) { 
  }

  ngOnInit() {
      this.createTeamForm();
      this.addEmployee('00', true);
      this.addEmployee('99', false);
      this.addEmployee('77', false);
  }

createTeamForm(){
      this.teamForm = this.formBuilder.group({
      empFormArray: this.formBuilder.array([]) 
      }); 
  }
  get empFormArray(): FormArray{
      return this.teamForm.get('empFormArray') as FormArray;
  }

  addEmployee(name, selected){

    let obj = {
       name: name,
      isSelected: selected
    }

    let fg = this.formBuilder.group({
        name: [obj]
      });

      this.empFormArray.push(fg);     
  }

  onFormSubmit() {
      let data = JSON.stringify(this.teamForm.value);
      console.log(data);

    this.formSubmitted = true;
      // this.teamForm.reset();   
  }   
}

Answer 1

你正在推动一个包含name和name的对象isSelected到你的formArray：

let obj = {
  name: name,
  isSelected: selected
}

let fg = this.formBuilder.group({
  name: [obj] // here!
});

this.empFormArray.push(fg);     

你想要的只是将obj按原样推送到formArray，所以：

let fg = this.formBuilder.group({
  name: name,
  isSelected: selected
});

此外，您还需要修改模板并将复选框中的formcontrol设置为isSelected而不是name，并删除[value]。另请注意，我们需要在模板中使用controls来获取您的员工姓名。所以改变：

<input type="checkbox" [value]="emp.isSelected" formControlName="name">{{emp.name}}

至：

<input type="checkbox" formControlName="isSelected">{{emp.controls.name.value}}

那应该解决你的问题:)

StackBlitz

Answer 2

我推荐使用https://vitalets.github.io/checklist-model/。这使得使用检查表变得非常容易。