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`FormController` keeps track of all its controls and nested forms as well as the state of them, such as being valid/invalid or dirty/pristine.

Each form directive creates an instance of `FormController`.

## Methods

- ###

  `$rollbackViewValue();`

  Rollback all form controls pending updates to the `$modelValue`.

  Updates may be pending by a debounced event or because the input is waiting for a some future event defined in `ng-model-options`. This method is typically needed by the reset button of a form that uses `ng-model-options` to pend updates.

- ###

  `$commitViewValue();`

  Commit all form controls pending updates to the `$modelValue`.

  Updates may be pending by a debounced event or because the input is waiting for a some future event defined in `ng-model-options`. This method is rarely needed as `NgModelController` usually handles calling this in response to input events.

- ###

  `$addControl();`

  Register a control with the form.

  Input elements using ngModelController do this automatically when they are linked.

- ###

  `$removeControl();`

  Deregister a control from the form.

  Input elements using ngModelController do this automatically when they are destroyed.

- ###

  `$setValidity();`

  Sets the validity of a form control.

  This method will also propagate to parent forms.

- ###

  `$setDirty();`

  Sets the form to a dirty state.

  This method can be called to add the 'ng-dirty' class and set the form to a dirty state (ng-dirty class). This method will also propagate to parent forms.

- ###

  `$setPristine();`

  Sets the form to its pristine state.

  This method can be called to remove the 'ng-dirty' class and set the form to its pristine state (ng-pristine class). This method will also propagate to all the controls contained in this form.

  Setting a form back to a pristine state is often useful when we want to 'reuse' a form after saving or resetting it.

- ###

  `$setUntouched();`

  Sets the form to its untouched state.

  This method can be called to remove the 'ng-touched' class and set the form controls to their untouched state (ng-untouched class).

  Setting a form controls back to their untouched state is often useful when setting the form back to its pristine state.

- ###

  `$setSubmitted();`

  Sets the form to its submitted state.

## Properties

- ### `$pristine`

  boolean | True if user has not interacted with the form yet.

- ### `$dirty`

  boolean | True if user has already interacted with the form.

- ### `$valid`

  boolean | True if all of the containing forms and controls are valid.

- ### `$invalid`

  boolean | True if at least one containing control or form is invalid.

- ### `$submitted`

  boolean | True if user has submitted the form even if its invalid.

- ### `$error`

  Object | Is an object hash, containing references to controls or forms with failing validators, where: keys are validation tokens (error names), values are arrays of controls or forms that have a failing validator for given error name. Built-in validation tokens: `email` `max` `maxlength` `min` `minlength` `number` `pattern` `required` `url`