Implementing two-way binding in an Angular 9 form I attempted to use [(ngmodel)] in the form, however it resulted in an error. This feature has been deprecated in Angular 6 and newer versions.
Implementing two-way binding in an Angular 9 form I attempted to use [(ngmodel)] in the form, however it resulted in an error. This feature has been deprecated in Angular 6 and newer versions.
Transitioning from ngModel in Reactive Forms
In Angular v6, the support for using ngModel input property and ngModelChange event with reactive form directives is being deprecated and will eventually be removed in a future version of Angular.
Deprecated Syntax:
<input [formControl]="control" [(ngModel)]="value">
this.value = 'some value';
This deprecation is due to various reasons. Firstly, developers have found this approach to be confusing. It may appear like the actual ngModel directive is being used, but in reality, it is an input/output property named ngModel on the reactive form directive that imitates some, but not all, of the directive's functionalities. While it allows for getting and setting values and intercepting value events, certain features of ngModel, such as delayed updates with ngModelOptions or exporting the directive, do not function correctly.
Furthermore, this approach mixes template-driven and reactive forms strategies, preventing the utilization of the full benefits of either approach. Setting the value in the template contradicts the template-agnostic principles of reactive forms, while incorporating a FormControl/FormGroup layer in the class eliminates the simplicity of defining forms in the template.
To update your code prior to the removal of support, you must choose whether to continue using reactive form directives (and manipulate values using reactive forms conventions) or transition to template-driven directives.
Post-Update (Option 1 - Utilize Reactive Forms):
<input [formControl]="control">
this.control.setValue('some value');
Post-Update (Option 2 - Use Template-Driven Forms):
<input [(ngModel)]="value">
this.value = 'some value';
When following this pattern, a deprecation warning will be displayed in development mode by default. You have the option to suppress this warning by providing a configuration for ReactiveFormsModule during import:
imports: [
ReactiveFormsModule.withConfig({warnOnNgModelWithFormControl: 'never'});
]
Alternatively, you can opt to receive a distinct warning for each instance of this pattern with a configuration value of "always". This can aid in pinpointing where in the code this pattern is being used as the code is being updated.
For More Information:
https://angular.io/guide/deprecations#ngmodel-with-reactive-forms
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