Question

我试图从服务中加载嵌套的对象数据，然后将所有这些数据放入窗体中，并与FormBuilder和FormArray分组。我能够使用服务数据的值创建表单，但是遇到一个问题，即表单的最后一个嵌套对象无法获取其值，我尝试了多个具有1个或多个记录的示例数据，但总会发生表格中最后一个嵌套的记录没有值，但是当我手动更改缺少的表格值的离子输入时，该表格能够获取更改后的值，然后出现在正确的formArray中。以下是与该表单创建相关的我的.ts文件和html。

ngOnInit() {
    this.getSchemeDetail();
    this.form = this._FB.group({
      'scheme_id': ['', Validators.required],
      'components': this._FB.array([]),
    }); 
  }

  getSchemeDetail(){
    this.mschemeService.getMScheme(this.mschemeID).subscribe(
      (data) => {
        this.component = data;
        for(var i = 0; i < this.component.length; i++){
          var obj = this.component[i];
          this.category = obj.category
          console.log(this.category)
        }
        this.loadForm(this.component)
      }
    )
  }

  loadForm(component : M_Component[]){
    for (let line = 0; line < component.length; line++){
      const compFormArray = this.form.get('components') as FormArray;
      compFormArray.push(this.comps);
      compFormArray.patchValue(component)

      for (var i in component[line].category){
        const cateFormArray = compFormArray.at(line).get('category') as FormArray
        cateFormArray.push(this.cates);
        cateFormArray.patchValue([component[line].category])
        console.log(i)
      }
    }   
  }

  get comps(): FormGroup{
    return this._FB.group({     
      'COMPONENT_ID': [''],
      'TITLE': ['', Validators.required],
      'DESC': [''],
      'category': this._FB.array([])
    })
  }

  get cates(): FormGroup{
    return this._FB.group({
      'CRITERIA': [''],
      'POINTS': ['']
    })
  }

<ion-card *ngFor="let mcomp of component; let comps of form['controls'].components['controls']; let i = index" formGroupName="{{i}}">
...
<tbody *ngFor="let mcate of mcomp.category; let cates of comps['controls'].category['controls']; let j = index" formGroupName="{{j}}">

以下是具有不同记录数的form.value的结果，基本上服务数据能够与表单值链接，但是嵌套“ category” formArray（条件和点）的最后一条记录无法将服务数据转换为表单值。请随时纠正我，谢谢！

//Example of Form Value with 2 records
{components: [
    {'COMPONENT_ID': 17, 
     'TITLE': 'Understanding in skills', 
     'DESC': 'abc',
     'SUB_POINT': 20, 
     'category': [
        {'CRITERIA': 'Only minimal understanding shown of subject matter.', 
         'POINTS': '0 - 4'},
        {'CRITERIA': 'Good understanding.', 
         'POINTS': '5 - 10'}
      ],
    {'COMPONENT_ID': 18, 
     'TITLE': 'Test2', 
     'DESC': 'abcd',
     'SUB_POINT': 20, 
     'category': [
        {'CRITERIA': '', 
         'POINTS': ''},
        {'CRITERIA': '', 
         'POINTS': ''}
      ],
    }
}
//Example of Form Value with 1 records
{components: [
    {'COMPONENT_ID': 16, 
     'TITLE': 'Test1', 
     'DESC': 'abcd',
     'SUB_POINT': 20, 
     'category': [
        {'CRITERIA': '', 
         'POINTS': ''},
        {'CRITERIA': '', 
         'POINTS': ''}
      ],
    }
}

从服务到具有FormArray的嵌套FormGroup的离子类型脚本PatchValue

0 个答案: