如何根据另一个字段的值显示/隐藏一个字段

Angular 2 Dynamic Forms How to show/hide a field based on the values of another

本文关键字：字段 隐藏 一个 显示 何根 另一个      更新时间：2023-09-26

环境:Angular 2 RC 4, Typescript.

我有一个动态Angular表单的实现。我总共有4个字段-工作，电子邮件，问题和答案

问题:

dob: new TextboxQuestion({
      key: 'dob',
      label: 'Date of Birth',
      value: '',
    }),

    email: new TextboxQuestion({
      key: 'email',
      label: 'Email Address',
      value: '',
      type: 'email',
    }),
    securityQuestion: new TextboxQuestion({
      key: 'challengeQuestion',
      label: 'Security Question',
      value: '',
      disabled: true
    }),
    securityAnswer: new TextboxQuestion({
      key: 'challengeAnswer',
      label: 'Write your answer',
      value: '',
    })

主/父组件的HTML片段

<dynamic-form (responsesEvt)="onFormSubmitResponseReceived($event);" [sections]="sections" class="col-md-8"></dynamic-form>

动态表单组件
<form (ngSubmit)="onSubmit()" [formGroup]="form"> 
            <div *ngFor="let question of questions" class="form-row" >
                <df-question [question]="question" [form]="form" *ngIf="!section.hidden"></df-question>
            </div>
        <div class="row">
            <div class="col-md-5"></div>
            <div class="col-md-7 btn-row">
                <button type="submit" class="btn btn-primary pull-right" [disabled]="!form.valid">I agree with the Terms & Conditions</button>
                <!--<button type="submit" class="btn btn-primary pull-right" [disabled]="!form.valid || subbmittedalready">I agree with the Terms & Conditions</button>-->
                <button type="button" class="btn btn-default pull-right">Cancel</button>
            </div>
        </div>
    </form>

df-question组件

<div [formGroup]="form">
  <div class="col-md-5"><label class="pull-right" [attr.for]="question.key"><span class="errorMessage">*&nbsp;</span>{{question.label}}</label></div>
  <div class="col-md-7" [ngSwitch]="question.controlType">
    <input *ngSwitchCase="'textbox'" [formControlName]="question.key" [id]="question.key" [type]="question.type" class="form-control"
      [placeholder]="question.placeHolder"
       />
  </div>
  <div class="col-md-5"></div>
</div>

这是我的工作流程

Step 1 Initially at form load, only dob and email show up.
Step 2 User types in the dob and email. DOB and email are sent to the backend and if the info is correct, a "question" is returned.
Step 3 Now the question and answer fields appear (assuming that above step was successful). The question field is populated with the value returned from the server through the previous request
Step 4 User submits the form with dob, email, question and answer

关于如何使用动态表单来实现这一点，有什么想法吗?

我想可以以某种方式在工作后抛出一个事件，电子邮件被填满，调用后端并获得问题。使用一个变量来隐藏/显示基于上述响应的成功/失败的问题和答案?

如果这是一个好方法，我怎么能感觉到用户已经填写了前两个字段并进行后端调用?在收到服务器响应后，如何更新问题字段(特别是使用动态表单)?

如果没有，有没有更简单的方法?

我知道这是一个迟来的答案，但我认为本质上这个苏格兰威士忌。IO post涵盖了你需要做的基本内容。

您创建一个表单组，并根据字段的值交换验证，并且在视图中，您隐藏了使用ngif禁用的字段

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