Question

因此，我创建了一个嵌套的FormGroup（问卷），其中包含一个FormArray（节），其中包含另一个FormGroup（creatSection（）），其中又包含另一个FormArray（问题），在其中我们还有另一个表单组（creatQuestion（）），我们还有另一个具有表单组的formarray（answer）（creatAnswer（））所以一切都很好，除非我想添加另一个问题或其他答案，否则addSection可以正常工作这样创建就可以了，但是添加中的问题。我在想的是，当您创建一个问题时，它不知道将在哪里放置它，但是我不知道该如何解决所以我的问卷调查表看起来像这样

import { Component, OnInit } from '@angular/core';
import { FormBuilder, FormGroup, FormArray } from '@angular/forms'
@Component({
  selector: 'app-questionnaire',
  templateUrl: './questionnaire.component.html',
  styleUrls: ['./questionnaire.component.css']
})
export class QuestionnaireComponent implements OnInit {
questionnaire:FormGroup;
section:FormArray; 
question:FormArray;
answer:FormArray;
  constructor(private fb:FormBuilder) { }

  ngOnInit() {
    this.questionnaire=this.fb.group({ 
      questionnaireName: [''],      
      section : this.fb.array([this.creatSection()])
    })
  }

creatSection():FormGroup{
return this.fb.group({
 sectionName:[''],
 question:this.fb.array([this.creatQuestion()])
}) 
}

addSection(){
 this.section=this.questionnaire.get('section') as FormArray;
  this.section.push(this.creatSection());
}

creatQuestion():FormGroup{
  return this.fb.group({
    questionName:[''],
    type:[''],
    answer:this.fb.array([this.creatAnswer()])
  })
}

addQuestion(){
  this.question=this.creatSection().get('question') as FormArray;
  this.question.push(this.creatQuestion());
}

creatAnswer():FormGroup{
  return this.fb.group({
    id:[''],
    answerName:['']
  })
}

addAnswer(){
  this.answer=this.creatQuestion().get('answer') as FormArray;
  this.answer.push(this.creatAnswer());
}

onSubmit(){
  console.log(this.questionnaire.value); 
}

}

和问卷调查表html就是这样

<h1>questionnaire bla bla</h1>
<!-- <app-section></app-section> -->
<form [formGroup]="questionnaire" (ngSubmit)="onSubmit()">
    <input type="text" placeholder="questionnaire..." formControlName="questionnaireName">
    <ng-container formArrayName="section">
    <div [formGroupName]="i" *ngFor="let ques of questionnaire.get('section').controls;let i = index;">

            <input placeholder="section..." formControlName="sectionName" type="text">
            <button (click)="addSection()">add section</button>
            <ng-container formArrayName="question">
            <div [formGroupName]="j" *ngFor="let sec of creatSection().get('question').controls;let j=index;">

                    <input placeholder="question..." formControlName="questionName" type="text">
                    <input placeholder="type..." formControlName="type" type="text">
                    <button (click)="addQuestion()">add question</button>
                    <ng-container formArrayName="answer">
                    <div [formGroupName]="k" *ngFor="let ans of creatQuestion().get('answer').controls;let k=index;">

                            <input placeholder="réponse..." formControlName ="answerName" type="text">
                            <button (click)="addAnswer()">add answer</button>
                        </div>
                    </ng-container>    
                </div>
            </ng-container>
        </div>
    </ng-container>
    <button type="submit">submit</button>
</form>
{{questionnaire.value | json}}

Answer 1

首先不要在.html

中调用creatSection（）

//WRONG
<div [formGroupName]="j" *ngFor="let sec of creatSection().get('question').controls;let j=index;">
//OK
<div [formGroupName]="j" *ngFor="let sec of ques.get('question').controls;let j=index;">

好吧，您需要将数组的“索引”作为参数传递（我称为“经典方式”），但是您也可以传递数组本身的组

<button (click)="addAnswer(i,j)">add answer</button>
//or
<button (click)="addAnswer(sec)">add answer</button>

在“经典”中

addAnswer(i:number:j:number)
{
   const arraySection=((this.questionnaire.get('section') as FormArray)
   const groupQuestion=(arraySection.get('question') as FormArray).at(i)
   const arrayAnswer=groupQuestion.get('answer') as FormArray
   arrayAnswer.push(this.creatAnswer())
}

如果您通过数组本身

addAnswer(groupQuestion:FormArray)
{
   const arrayAnswer=groupQuestion.get('answer') as FormArray
   arrayAnswer.push(this.creatAnswer())
}

注意：使用stackblitz可以更轻松地检查代码，可能在我的代码中出现错误，请把它弄清楚

Answer 2

由于@Eliseo，结果看起来像 survey.html

my_function <- function(x){
  print(names(x[x>mean(x)]))
}

test.frame <- data.frame(nr=1:10, factor=rep(c("A", "B"), 5))
rownames(test.frame) <- letters[1:10]

tapply(test.frame$nr, test.frame$factor, my_function)

和问卷.ts看起来像这样

<h1>questionnaire bla bla</h1>
<form [formGroup]="questionnaire" (ngSubmit)="onSubmit()">
    <input type="text" placeholder="questionnaire..." formControlName="questionnaireName">
    <ng-container formArrayName="section">
    <div [formGroupName]="i" *ngFor="let ques of questionnaire.get('section').controls;let i = index;">

            <input placeholder="section..." formControlName="sectionName" type="text">
            <button (click)="addSection()">add section</button>
            <ng-container formArrayName="question">
            <div [formGroupName]="j" *ngFor="let sec of ques.get('question').controls;let j=index;">

                    <input placeholder="question..." formControlName="questionName" type="text">
                    <input placeholder="type..." formControlName="type" type="text">
                    <button (click)="addQuestion(ques)">add question</button>
                    <ng-container formArrayName="answer">
                    <div [formGroupName]="k" *ngFor="let ans of sec.get('answer').controls;let k=index;">

                            <input placeholder="réponse..." formControlName ="answerName" type="text">
                            <button (click)="addAnswer(sec)">add answer</button>
                        </div>
                    </ng-container>    
                </div>
            </ng-container>
        </div>
    </ng-container>
    <button type="submit">submit</button>
</form>
{{questionnaire.value | json}}

角度反应形式在另一个FormArray内的另一个FormArray内的嵌套FormGroup内添加FormArray

2 个答案: