The model/angularjs architecture in a MVC-based application is generally responsible for modeling the data utilized in the view and handling user interactions, for example, clicking on buttons, scrolling, or causing different changes in the view. In essential models, AngularJS utilizes the $scope object as the model.
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The ngModel directive binds an input,select, textarea (or custom form control> to a property on the scope utilizing NgModelController, which is made and expoed by this directive.
ngModel is responsible for:
Binding the view into the model, which different directives like input, textarea or select require.
Providing validation behavior (for example required, number, email, url> .
Keeping the condition of the control (substantial/invalid, filthy/flawless, contacted/untouched, validation errors> .
Setting related css classes on the component (ng-valid, ng-invalid, ng-dirty, ng-pristine, ng-touched, ng-untouched, ng-empty, ng-not-empty> including movements.
Enrolling the control with its parent structure.
Note: ngModel will attempt to bind to the property given by assessing the expression on the current scope. If the property doesn't already now exist on this scope, it will be made implicitly and added to the scope.