如何使用angular-material对几个复选框进行分组

时间:2018-06-06 21:56:13

标签: javascript angular angular-material

假设我有一个表单来创建商店。我想输入它的名字,以及商店开放的日子。

所以我会有一个带有一些输入的表单,我想在一个mat-form-field中对复选框进行分组。

store-form-component.html:

<form (ngSubmit)="onSaveStore()" [formGroup]="storeForm">
  <mat-form-field>
    <mat-label>Store name</mat-label>
    <input matInput placeholder="store name" formControlName="name" required>
  </mat-form-field>
  <mat-form-field [formGroup]="storeForm.controls.availableDays>
    <mat-checkbox *ngFor="let availableDay of storeForm.controls.availableDays.controls; let i=index" formControlName="{{i}}">{{i}}</mat-checkbox>
  </mat-form-field >
</form>

store-form-component.ts:

export class StoreFormComponent implements OnInit {

  // Form Groups
  storeForm: FormGroup;

  constructor(
    private formBuilder: FormBuilder
  ) {}

  ngOnInit(): void { 
    this.initForm();
  }

  initForm(): void {
    this.storeForm = this.formBuilder.group({
      name: "",
      availableDays: this.getAvailableDays()
    });
  }

  getAvailableDays(): FormGroup {
    return this.formBuilder.group({
      monday: false,
      tuesday: false,
      wednesday: false,
      thursday: false,
      friday: false,
      saturday: false,
      sunday: false
    });
  }

它不起作用,我无法理解为什么......

编辑:感谢@ g-tranter(以及其他SO帖子),我可以解决这个问题。最终代码如下:

store-form-component.html:

<form (ngSubmit)="onSaveStore()" [formGroup]="storeForm">
  <div [formGroup]="storeForm.controls.availableDays">
    <mat-checkbox *ngFor="let availableDay of days;" formControlName="{{availableDay}}">{{availableDay}}</mat-checkbox>
  </div>
</form>

store-form-component.ts:

export class StoreComponent implements OnInit {
  // Form Groups
  storeForm: FormGroup;
  days: Array<string>;

  constructor(private formBuilder: FormBuilder) {}

  ngOnInit(): void {
    this.initForm();

    // this is useful to iterate over the form group
    this.days = Object.keys(this.storeForm.controls.availableDays.value);
  }

  initForm(): void {
    this.storeForm = this.formBuilder.group({
      name: "",
      availableDays: this.getAvailableDays()
    });
  }

  getAvailableDays(): FormGroup {
    return this.formBuilder.group({
      monday: false,
      tuesday: false,
      wednesday: false,
      thursday: false,
      friday: false,
      saturday: false,
      sunday: false
    });
  }
}

2 个答案:

答案 0 :(得分:1)

也许你需要一个mat-selection-list

检查Angular Material documentation

希望它可以帮到你!

答案 1 :(得分:1)

您正在将表单控件名称设置为数字索引:

formControlName="{{i}}"

在表单组中不存在。

您需要将其设置为&#34;星期一&#34;等或设置

[formControl]="availableDay"