I made a model-driven form in angular 2, and one of the input fields must show up only if a checkbox above is unchecked.I did this with *ngIf. My question is how can I set that input required only if the checkbox is unchecked? In angular 1.x i could make this happen with the ng-required="condition" in the view.
Here is the html:
//the checkbox
<div class="checkbox col-sm-9">
<label>
<input type="checkbox" id="getCompanyAddress" style="cursor: pointer;" [formControl]="form.controls['address']" >Use the company address
</label>
</div>
// the option input:
<div *ngIf="form.value.address == false" class="form-group" [ngClass] = "{'has-error':!form.controls['address'].valid && form.controls['address'].touched}" >
<label for="add_gestion_adress" class="col-sm-3 control-label">Address
</label>
<div class="col-sm-9"><textarea rows="1" id="add_gestion_adress" class="form-control" name="add_gestion_adress" [formControl]="form.controls['address']" ></textarea>
</div>
</div>
//and the model code:
form: FormGroup;
constructor(fb:FormBuilder){
this.form = fb.group({
'name': [null,Validators.compose([Validators.required, Validators.minLength(1)])],
'type': ["en gros",Validators.compose([Validators.required, Validators.minLength(2)])],
'person':[null,Validators.compose([Validators.required, Validators.minLength(1)])],
'address':[false,Validators.compose([Validators.minLength(1)])],
'locality':[null, Validators.compose([Validators.required])],
'county':[null,Validators.compose([Validators.required])],
'country':[null,Validators.compose([Validators.required])]
})
}
<textarea [required]="your angular expression">
The above works in the latest version of Angular 4