[Angular 2] The form export from NgFormControl

时间:2021-07-10 07:30:35

In last post, we need to create an instanse variable:

sku: AbstructControl;

We can get rid of this by getting the exported form from NgFormControl, what we get is a directive, to get control, we need to call .control:

            <div class="form-group" [class.has-error]="!sku.valid && sku.touched">
<label for="skuInput">SKU</label>
<input type="text"
class="form-control"
id="skuInput"
#sku = "form"
placeholder="SKU"
[ng-form-control]="myForm.controls['sku']">
</div>

  

To use it:

<div *ng-if="!sku.control.valid"
class="bg-warning">SKU is invalid</div>

Notic, this is only available for the control, not for the from, if we do:

            <div *ng-if="myForm.control.hasError('required', 'sku')">
SKU is required
</div>

Will cause error.

Code:

import {Component, View, FORM_DIRECTIVES, Validators, FormBuilder, NgIf} from 'angular2/angular2';

@Component({
selector: 'demo-form-sku'
})
@View({
directives: [FORM_DIRECTIVES, NgIf],
template: `
<div>
<h2>Demo Form: Sku</h2>
<!-- ngForm is attched to the form, and #f="form" form is also come from ngForm-->
<form [ng-form-model]="myForm"
(submit)="onSubmit(myForm.value)">
<div class="form-group" [class.has-error]="!sku.valid && sku.touched">
<label for="skuInput">SKU</label>
<input type="text"
class="form-control"
id="skuInput"
#sku = "form"
placeholder="SKU"
[ng-form-control]="myForm.controls['sku']">
</div>
<div *ng-if="!sku.control.valid"
class="bg-warning">SKU is invalid</div>
<button type="submit" class="btn btn-default">Submit
</button>
<div *ng-if="myForm.hasError('required', 'sku')">
SKU is required
</div> </form>
<div *ng-if="!myForm.valid"
class="bg-warning">Form is invalid</div>
</div>
`
}) export class DemoFormSku {
myForm: ControlGroup; //sku: AbstractControl;
constructor(fb:FormBuilder) { this.myForm = fb.group({ "sku": ["", Validators.required] }); this.sku = this.myForm.controls['sku']; } onSubmit(value){ console.log(value); } }