Question

我使用以下代码块创建表单：

@Input() fetchedTask: Task;
taskForm: FormGroup;
formThresholds: FormArray;

this.taskForm = this._formBuilder.group({
            taskId: null,
            groupId: this.groupId,
            name: ["", [Validators.required]],
            taskType: this.taskTypeId,
            etc.
            configuration: this._formBuilder.group({
                name: ["", Validators.required],
                path: ["", Validators.required],
                thresholds: this._formBuilder.array([])
            })
        });

我稍后使用setValue()设置表单的值：

this.taskForm.controls["taskId"].setValue(this.fetchedTask.taskId);

我使用以下方法设置FormArray的值：

this.fetchedTask.configuration.thresholds.forEach((x)=>{
              this.addItem(x.value, x.name);
            })

addItem(value: number, name: string): void {
      this.formThresholds = this.taskForm.get('configuration.thresholds') as FormArray;
      this.formThresholds.push(this.createItem(value, name));
    }

createItem(value: number, name: string): FormGroup{
      return this._formBuilder.group({
        value: value,
        name: name
      });
    }

我真的不知道如何遍历数组值并以填充值的形式显示它们。

我尝试过但没有成功：

        <div *ngFor="let threshold of taskForm.get('configuration.thresholds') let i = index;">
            <div [formGroupName]="i">
                <input formControlName="name" placeholder="Threshold name">
                <input formControlName="value" placeholder="Threshold value">
            </div>
        </div>

Answer 1

您可以直接将HTML插入如下：

*ngFor="let threshold of taskForm['controls'].configuration['controls'].thresholds['controls']; let i = index;"

或者您可以在component中创建一个get属性，并在html或ts文件中使用它。

get formThresholds():FormArray{
    return this.taskForm.get('configuration.thresholds') as FormArray;
}

Answer 2

感谢Gourav Garg和我的摆弄，我想出了一个答案。

问题是我错过了一个父div标签，该标签指向formArray所属的formGroup-“配置”表单组。

对于此表单结构：

this.taskForm = this._formBuilder.group({
            taskId: null,
            groupId: this.groupId,
            name: ["", [Validators.required]],
            taskType: this.taskTypeId,
            etc.
            configuration: this._formBuilder.group({
                name: ["", Validators.required],
                path: ["", Validators.required],
                thresholds: this._formBuilder.array([])
            })
        });

get thresholds(): FormArray{
      return this.formThresholds = this.taskForm.get('configuration.thresholds') as FormArray;
    }

如果要在页面上显示阈值，则需要4个标签。示例：

<form [formGroup]="taskForm">
    <div formGroupName="configuration">
        <div formArrayName="thresholds"
            *ngFor="let threshold of this.taskRunProfileForm['controls'].configuration['controls'].thresholds['controls']; let i = index;">
            <div [formGroupName]="i">
                {{name.value}}
                {{value.value}}
            </div>
        </div>
    </div>
</form>

Angular：如何循环遍历嵌套在另一个FormGroup中的FormGroup中的FormArray？

2 个答案: