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

# Interface HasChangedHandlers

All Superinterfaces:
  `HasHandlers`

All Known Implementing Classes:
  `AIDataQuestionItem`, `AutoFitTextAreaItem`, `BlurbItem`, `BooleanItem`, `ButtonItem`, `CancelItem`, `CanvasItem`, `CheckboxItem`, `ColorItem`, `ColorPickerItem`, `ComboBoxItem`, `DateItem`, `DateRangeItem`, `DateTimeItem`, `DoubleItem`, `FileItem`, `FileUploadItem`, `FloatItem`, `FormItem`, `HeaderItem`, `HiddenItem`, `IntegerItem`, `IPickTreeItem`, `LinkItem`, `MiniDateRangeItem`, `MultiComboBoxItem`, `MultiFileItem`, `MultiPickerItem`, `NativeCheckboxItem`, `PasswordItem`, `PickTreeItem`, `PresetCriteriaItem`, `PresetDateRangeItem`, `RadioGroupItem`, `RelativeDateItem`, `ResetItem`, `RichTextItem`, `RowSpacerItem`, `SavedSearchItem`, `SectionItem`, `SelectItem`, `SelectOtherItem`, `SetFilterItem`, `ShuttleItem`, `SliderItem`, `SpacerItem`, `SpinnerItem`, `StaticTextItem`, `SubmitItem`, `TextAreaItem`, `TextItem`, `TimeItem`, `ToggleItem`, `ToolbarItem`, `UploadItem`, `ViewFileItem`

public interface HasChangedHandlers extends HasHandlers

- ## Method Summary

  Modifier and Type
  Method
  Description
  `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 Details

  - ### addChangedHandler

    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