包括一个组件作为FormControl Angular2 [英] Include a component as FormControl Angular2

问题描述

我有一个通过表单构建器构建的表单组件，现在在该表单中，我需要包含一个只有一个输入框作为表单控件的组件.

I have component that has form built through form builder and now in that form i need to include a component that has only one input box as a form control.

add.ts

this.newForm = this.fb.group({
      name: ['', [Validators.required]],
      surname:['', [Validators.required]],
      time: ''
    });

时间"必须作为一个不同的组成部分包括在内.

"time" has to be included as a different component.

add.html

<div class="form-group">
            <label class="col-md-3 control-label" for="name">{{'forms.newForm.label.configuration.name' | translate}}</label>  
            <div class="col-md-3">
              <input type="text" formControlName="name" placeholder="placeholder" 
                  class="form-control input-md" type="text">
              <small *ngIf="!newForm.controls.name.valid && newForm.controls.name.dirty" class="text-danger">
                Name is required.
              </small>
            </div>

            <label class="col-md-3 control-label" for="surname">{{'forms.newForm.label.configuration.name' | translate}}</label>  
            <div class="col-md-3">
              <input type="text" formControlName="surname" placeholder="placeholder" 
                  class="form-control input-md" type="text">
              <small *ngIf="!newForm.controls.surname.valid && newForm.controls.name.dirty" class="text-danger">
                Surname is required.
              </small>
            </div>
          </div>

time.html

time.html

<div>
  <div class="col-md-7">
    <input class="form-control input-md" type="text" (keydown)="eventHandler($event)" maxlength="11">
    <small *ngIf="!validTime" class="text-danger">
      Invalid time
    </small>
  </div>
</div>

我如何将表单控件时间"作为主要表单的组成部分包含在内，以便我可以通过this.newForm.controls ['time'].value?

How to i include form control "time" as a component in the main form so i can access the value through this.newForm.controls['time'].value??

推荐答案

单个Form Control不能单独传递给子组件，必须在formGroup中传递.因此，在您的表单中添加一个组(此处为timeGroup):

A single Form Control cannot be passed separately to the child component, it has to be passed within a formGroup. So add a group (here named timeGroup) to your form:

this.newForm = this.fb.group({
      name: ['', [Validators.required]],
      surname:['', [Validators.required]],
      timeGroup: this.fb.group({
        time: ''
      })
});

在您的父html中将formGroup传递给您的孩子:

In your parent html pass the formGroup to your child:

<time-comp [timeGroup]="newForm.controls.timeGroup"></time-comp>

和子模板:

<div [formGroup]="timeGroup">
  <input formControlName="time">
</div>

并且不要忘记用Input标记从父级收到的表单组:

And do not forget to mark the formgroup received from parent with Input:

@Input() timeGroup: FormGroup;

然后，您可以通过以下方式访问time值(在您的父级中):

Then you can access the time value (in your parent) with:

this.newForm.get('timeGroup').get('time').value;

还请注意，您不需要任何事件，例如keyup，更改将由没有它们的父级捕获.

Also notice that you do not need any events, like keyup, the changes will be catched by the parent without them.

> 样本柱塞

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