What is form controller?

A form controller is triggered either upon the form’s submission or on adding or updating input in a form field. When a user adds or updates an input value in a form field or clicks the submit or cancel button in the form, the form function associated with this function is triggered to execute the intended action.

What is$ dirty in angularjs?

$dirty means the user has changed the input value, $invalid means the address itself is invalid. Therefore the error is only shown if the user has actively changed the input value to either an empty or invalid value.

Which of the following are validation directives?

Validation in AngularJS

Directive	Description
ng-maxlength	Sets maxlength attribute on an input field. Setting the attribute to a negative or non-numeric value, allows view values of any length.
ng-pattern	Sets pattern validation error key if the ngModel value does not match the specified RegEx expression.

Is pristine angular?

AngularJS keeps tracks of all the form and input field and it also stores the information about whether anyone has touched or modified the field or not. ng-pristine: The ng-pristine class tells that the form has not been modified by the user. This returns true if the form has not been modified by the user.

Is pristine Angular?

What is FormControlName in Angular?

FormControlName is used to sync a FormControl in an existing FormGroup to a form control element by name. Syntax: Exported from: ReactiveFormsModule.

What is $setValidity in AngularJS?

The $setValidity() function is a built-in AngularJS function that is used to assign a key/value combination that can be used to check the validity of a specific model value. The key in this case is “unique” and the value is either true or false.

Which of the following is not validation directive?

AngularJS includes the following validation directives….Validation in AngularJS.

Directive	Description
ng-pattern	Sets pattern validation error key if the ngModel value does not match the specified RegEx expression.

Is dirty in Angular?

ng-dirty: The ng-dirty class tells that the form has been made dirty (modified ) by the user. It returns true if the user has modified the form. Return type: Return Boolean True if the form/input field is modified by the user else it returns False.

What is the difference between ngModel and formControlName?

In short ngModel can’t be used by itself within FormGroup When you use formControlName, ngModel does not activate or create a control (it’s simply used as an @Input). formControlName just links to the existing input you created in your class.

Can we use formControlName without FormGroup?

Without a parent FormGroup, [formControl]=”name” worked earlier because that directive can stand alone, that is, it works without being in a FormGroup. With a parent FormGroup, the name input needs the syntax formControlName=name in order to be associated with the correct FormControl in the class.

Is ngModel two way binding?

The Angular uses the ngModel directive to achieve the two-way binding on HTML Form elements. It binds to a form element like input , select , selectarea .

What are directives in AngularJS?

AngularJS directives are extended HTML attributes with the prefix ng- . The ng-app directive initializes an AngularJS application. The ng-init directive initializes application data. The ng-model directive binds the value of HTML controls (input, select, textarea) to application data.

Why component is a directive?

A component is a directive used to shadow DOM to create and encapsulate visual behavior called components. They are typically used to create UI widgets. A Directive is usually used while adding behavior to an existing DOM element. For registering a component, we use @Component metadata annotation attributes.

Which of the following is not an Angular directive?

ng-state is not an AngularJS directive. Q 15 – Which of the following is true about ng-app directive? A – ng-app directive defines and links an AngularJS application to HTML.