环境:Angular 2 RC 4, typescript 。
我有一个 Dynamic Angular forms 的实现.我总共有 4 个字段 - 出生日期、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: '',
})
主要/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-问题组件
<div [formGroup]="form">
<div class="col-md-5"><label class="pull-right" [attr.for]="question.key"><span class="errorMessage">* </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实现这一点有什么想法吗?
我想我可以 在 dob 之后以某种方式抛出一个事件,电子邮件已填满,调用后端并获取问题。 根据上述响应的成功/失败使用变量来隐藏/显示问题和答案?
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。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,是否有更简单的方法来做到这一点?
最佳答案
我知道这是一个延迟的答案,但我认为本质上是 this Scotch.io post涵盖了您需要做的事情的基础知识。
您创建一个表单组并根据字段值换出验证,然后在 View 中使用 ngIfs 隐藏您禁用的字段。
关于javascript - Angular 2动态表单如何根据另一个字段的值显示/隐藏一个字段,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/38927988/