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angularangular2-templateangular2-ngmodel
Billy
Billy

Reputation: 905

Angular - ngModel is not updating the value to the component

The ngModel is not working. I'm using it with textbox.

app.component.html

<input type="text" [value]="name" [ngModel]="name">
Name is: {{name}}

app.component.ts

name = '';
constructor() { }

ngOnInit(): void {
  this.name = "Hello";
}

When I change the textbox value, the value is not changing in the component. But the two-way data binding is working with [(ngModel)]="name". Please help.

Upvotes: 1

Views: 2493

Answers (1)

Yong Shun
Yong Shun

Reputation: 51160

From ngModel description,

If you have a one-way binding to ngModel with [] syntax, changing the domain model's value in the component class sets the value in the view. If you have a two-way binding with [()] syntax (also known as 'banana-in-a-box syntax'), the value in the UI always syncs back to the domain model in your class.

Either you can work with [(ngModel)], the two-way binding as you mentioned,

or you need to have the (ngModelChange) event binding to update the variable with the input's value.

<input
  type="text"
  [ngModel]="name"
  (ngModelChange)="name = $event"
/>

Demo @ StackBlitz

Upvotes: 1

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