com.smartgwt.client.widgets.form.fields.events

## Interface HasChangedHandlers

- All Superinterfaces:
    com.google.gwt.event.shared.HasHandlers
  All Known Implementing Classes:
    AIDataQuestionItem, AutoFitTextAreaItem, BlurbItem, BooleanItem, ButtonItem, CancelItem, CanvasItem, CheckboxItem, ColorItem, ColorPickerItem, ComboBoxItem, DateItem, DateRangeItem, DateTimeItem, DoubleItem, FileItem, FloatItem, FormItem, HeaderItem, HiddenItem, IntegerItem, IPickTreeItem, LinkItem, MiniDateRangeItem, MultiComboBoxItem, MultiFileItem, NativeCheckboxItem, PasswordItem, PickTreeItem, PresetCriteriaItem, PresetDateRangeItem, RadioGroupItem, RelativeDateItem, ResetItem, RichTextItem, RowSpacerItem, SavedSearchItem, SectionItem, SelectItem, SelectOtherItem, SliderItem, SpacerItem, SpinnerItem, StaticTextItem, SubmitItem, TextAreaItem, TextItem, TimeItem, ToolbarItem, UploadItem, ViewFileItem

      public interface HasChangedHandlers
      extends com.google.gwt.event.shared.HasHandlers

- - ### Method Summary

    All Methods Instance Methods Abstract Methods
    Modifier and Type | Method and Description
    --- | ---
    `com.google.gwt.event.shared.HandlerRegistration` | `addChangedHandler(ChangedHandler handler)` Called when a FormItem's value has been changed as the result of user interaction.

    - ### Methods inherited from interface com.google.gwt.event.shared.HasHandlers

      `fireEvent`

- - ### Method Detail

    - #### addChangedHandler

          com.google.gwt.event.shared.HandlerRegistration addChangedHandler(ChangedHandler handler)

      Called when a FormItem's value has been changed as the result of user interaction. This method fires after the newly specified value has been stored.

      Change/Changed notifications vs "...When" rules: the `change` and `changed` events only fire when an end user modifies a field value. If you are trying to dynamically control the visibility or enabled state of other components in response to these events, consider instead using properties such as `Canvas.visibleWhen`, `item.readOnlyWhen`, `Canvas.enableWhen` on the target component. (Similar properties are available on `FormItem`, `Canvas`, `MenuItem` and other components).

      Parameters:
        `handler` - the changed handler
      Returns:
        `HandlerRegistration` used to remove this handler