步骤向导表单

Question

我正在使用角度动态形式制作角度应用程序，我需要将表单分成两部分。

我在第一页输入字段firstname and lastname，然后单击下一步按钮，需要加载具有email and dropdown 的子项..

HTML：

    <form (ngSubmit)="onSubmit()" [formGroup]="form">

        <div *ngFor="let question of questions" class="form-row">
            <ng-container *ngIf="question.children">
                <div [formArrayName]="question.key">
                    <div *ngFor="let item of form.get(question.key).controls; let i=index" [formGroupName]="i">
                        <div *ngFor="let item of question.children">
                            <app-question [question]="item" [form]="form.get(question.key).at(i)"></app-question>
                        </div>
                    </div>
                </div>
            </ng-container>
            <ng-container *ngIf="!question.children">
                <app-question [question]="question" [form]="form"></app-question>

            </ng-container>
        </div>

  <button (click)="goBack()"> Previous </button> &nbsp;
  <button (click)="addControls('myArray')"> Next </button> 

        <div class="form-row">
            <button type="submit" [disabled]="!form.valid">Save</button>
    </div>
  </form>

Ts：

  @Input() questions: QuestionBase<any>[] = [];
  form: FormGroup;
  payLoad = '';

  page: number = 0

  constructor(private qcs: QuestionControlService) { }

  ngOnInit() {
    this.form = this.qcs.toFormGroup(this.questions);
  }

  onSubmit() {
    this.payLoad = JSON.stringify(this.form.value);
  }
  addControls(control: string) {
    let question: any = this.questions.find(q => q.key == control);
    let children = question ? question.children : null;
    if (children)
      (this.form.get(control) as FormArray).push(this.qcs.toFormGroup(children))
  }
  removeControls(control: string){
    let array=this.form.get(control) as FormArray;
    array.removeAt(array.length-1);
  }

  goBack() {
    //Function to move to previous step
  }

工作演示：

https://stackblitz.com/edit/angular-x4a5b6-p4agaq

在这个带有代码的演示中，您可以在每次点击添加按钮时看到子项（数组）被附加到同一页面的下方。

我也有 removeControl 功能，

  removeControls(control: string){
    let array=this.form.get(control) as FormArray;
    array.removeAt(array.length-1);
  }

要明确，我现在不会使用它，也不会在任何地方删除任何东西.. 唯一的事情是通过addControl 功能单击下一个孩子，将孩子添加到下一页，然后在上一个返回到上一个一步。

为了附加到演示中给出的同一页面，它应该移动到下一页并再次单击上一个它应该在每次下一次单击时回到原始状态它应该给出一个新的email and dropdown 并且在上一个返回到上一步..

它应该像滑块一样移动，并在前后移动时具有滑动效果..

一切都需要纯 angular 和基于 javascript/typescript 的内容，并且没有 没有 jquery.. 正如您在我的演示中看到的那样，我没有包含任何库或 jquery..

请帮助我实现结果..卡了很长时间..

Answer 1

如果您想创建步进表单，您可以投影表单并使用表单控件连接父表单组。

ParentComponent.ts

---

下一个

<div class="step container" *ngIf="form.valid && nextForm" >
 <form [formGroup]="step2">
  <app-step2 (control)="enableSave($event)"></app-step2>
  <button class="btn btn-primary"  (click)="moveToPrevious()" >Previous</button>
</form>
</div>
<hr>
<button
[disabled]="eSave"
 class="btn btn-primary" (click)="save()">Save</button>
</app-stepper-wrapper>

ParentComponent.ts

name = 'Angular';
  eSave = true;
  form = new FormGroup({});
  step2 = new FormGroup({});
  nextForm = false;

  ngOnInit() {
    this.form.statusChanges.subscribe(s => this.eSave = true);
  }   
  moveToNext() {
    if (this.form.valid) {
      this.nextForm = true;
    }
  }   
  moveToPrevious() {
    this.nextForm = false;
  }
  save() {
    console.log(this.form);
    console.log(this.step2);
  }
  enableSave($event) {
    if ($event == 'VALID' && this.form.valid) {

      this.eSave = false;
    }
  }

例如：https://stackblitz.com/edit/angular-nynvvr

Answer 2

在 goBack 方法中传递要删除的数组

   <button (click)="goBack('myArray')"> Previous </button> &nbsp;    

把这个方法放到组件ts文件中

  goBack(control: string) {
    let question: any = this.questions.find(q => q.key == control);
     let children = question ? question.children : null;
    if (children)

      (this.form.get(control) as FormArray).removeAt(children.length-1)

  }

Answer 3

已尝试达到您的要求：UI 部分除外。我希望你能按照你的要求处理你的 UI。

TS：

    import { Component, Input, OnInit } from '@angular/core';
    import { FormGroup, FormArray } from '@angular/forms';

    import { QuestionBase } from './question-base';
    import { QuestionControlService } from './question-control.service';

    @Component({
      selector: 'app-dynamic-form',
      templateUrl: './dynamic-form.component.html',
      providers: [QuestionControlService]
    })
    export class DynamicFormComponent implements OnInit {

      @Input() questions: QuestionBase<any>[] = [];
      form: FormGroup;
      payLoad = '';

      page: number = 0;

      constructor(private qcs: QuestionControlService) { }

      ngOnInit() {
        this.form = this.qcs.toFormGroup(this.questions);
      }

      onSubmit() {
        this.payLoad = JSON.stringify(this.form.value);
      }
      addControls(control: string, index: any) {
        let array = this.form.get('myArray') as FormArray;
        if (array.length > this.page) {
          this.page = this.page + 1;
        } else {
          let question: any = this.questions.find(q => q.key == control);
          let children = question ? question.children : null;
          if (children)
            (this.form.get(control) as FormArray).push(this.qcs.toFormGroup(children))
          this.page = this.page + 1;
        }
      }
      removeControls(control: string) {
        let array = this.form.get(control) as FormArray;
        array.removeAt(array.length - 1);
      }

      goBack() {
        if (this.page > 0) {
          this.page = this.page - 1;
        }
        //let array = this.form.get('myArray') as FormArray;
        //array.removeAt(array.length - 1);
        //Function to move to previous step
      }

    }

HTML : 

<div>
    <form (ngSubmit)="onSubmit()" [formGroup]="form">

        <div *ngFor="let question of questions" class="form-row">
            <ng-container *ngIf="question.children">
                <div [formArrayName]="question.key">
                    <div *ngFor="let item of form.get(question.key).controls; let i=index" [formGroupName]="i">
            <ng-template [ngIf]="i + 1 == page"> 
              <div *ngFor="let item of question.children">
                <app-question [question]="item" [form]="form.get(question.key).at(i)"></app-question>
              </div>
            </ng-template>
                    </div>
                </div>
            </ng-container>
            <ng-container *ngIf="!question.children">
                <app-question [question]="question" [form]="form"></app-question>

            </ng-container>
        </div>

  <button (click)="goBack()"> Previous </button> &nbsp;
  <button (click)="addControls('myArray',i)"> Next </button> 

        <div class="form-row">
            <button type="submit" [disabled]="!form.valid">Save</button>
    </div>
  </form> <br>

  <pre>
{{form?.value|json}}
</pre>
</div>

这将帮助您一次显示一页。如果不存在下一个表单，它将创建一个新表单。点击上一个，它会导航到旧表单。

Answer 4

所以，您想从form group array 中删除最后添加的控件email and dropdown。

我已将代码添加到goBack() 函数中以删除子表单组控件。

组件：

  goBack() {
    //Function to move to previous step
    if(this.form.controls['myArray']){      
      const arr = <FormArray>this.form.controls.myArray;
      arr.removeAt(arr.length - 1);
    }
  }

工作演示：https://angular-x4a5b6-cc4kyr.stackblitz.io