Bidirectional data binding with a Form element

I've been attempting to connect an input to a form control. Here's the code snippet for the input:

<input [(ngModel)]="someProperty" ngControl="someProperty">

And in the component file:

someProperty: Control;

someForm:ControlGroup;

...

constructor(private _form_builder: FormBuilder){

    this.someProperty = new Control('', Validators.required);

    this.someForm = this._form_builder.group({

        someProperty:this.someProperty

    });

}

However, when I run the application, my input field displays [object Object], indicating that something isn't quite right with the binding. What is the correct way to accomplish this? Shouldn't the controls be able to handle these bindings seamlessly?

typescriptangular

Answer №1

someValue should be set as the value of the <input>. This value needs to be a string, while ngControl must reference the control.

<input [(ngModel)]="someValue" ngControl="someProperty">

someValue: string;

someProperty: Control;

someForm: ControlGroup;

...

constructor(private _form_builder: FormBuilder){

    this.someProperty = new Control('', Validators.required);

    this.someForm = this._form_builder.group({

        someProperty: this.someProperty

    });

}

For more information, please visit https://angular.io/docs/ts/latest/guide/forms.html

Answer №2

To connect a form control to an input, you must utilize the ngFormControl directive:

<input [(ngModel)]="someValue"
       [ngFormControl]="someProperty">

or

<input [(ngModel)]="someValue" 
       [ngFormControl]="someForm.controls.someProperty">

The ngControl directive is specifically for declaring inline controls.

For more information, check out this article:

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