Package com.vaadin.flow.component.checkbox

Class CheckboxGroup<T>

java.lang.Object
com.vaadin.flow.component.Component
com.vaadin.flow.component.AbstractField<C,T>
com.vaadin.flow.component.AbstractSinglePropertyField<CheckboxGroup<T>,Set<T>>
com.vaadin.flow.component.checkbox.CheckboxGroup<T>
All Implemented Interfaces:
com.vaadin.flow.component.AttachNotifier, com.vaadin.flow.component.DetachNotifier, com.vaadin.flow.component.HasAriaLabel, com.vaadin.flow.component.HasComponents, com.vaadin.flow.component.HasElement, com.vaadin.flow.component.HasEnabled, com.vaadin.flow.component.HasHelper, com.vaadin.flow.component.HasLabel, com.vaadin.flow.component.HasSize, com.vaadin.flow.component.HasStyle, com.vaadin.flow.component.HasTheme, com.vaadin.flow.component.HasValidation, com.vaadin.flow.component.HasValue<com.vaadin.flow.component.AbstractField.ComponentValueChangeEvent<CheckboxGroup<T>,Set<T>>,Set<T>>, com.vaadin.flow.component.HasValueAndElement<com.vaadin.flow.component.AbstractField.ComponentValueChangeEvent<CheckboxGroup<T>,Set<T>>,Set<T>>, HasClientValidation, HasThemeVariant<CheckboxGroupVariant>, HasTooltip, HasValidationProperties, InputField<com.vaadin.flow.component.AbstractField.ComponentValueChangeEvent<CheckboxGroup<T>,Set<T>>,Set<T>>, com.vaadin.flow.data.binder.HasItemComponents<T>, com.vaadin.flow.data.binder.HasValidator<Set<T>>, com.vaadin.flow.data.provider.HasDataView<T,Void,CheckboxGroupDataView<T>>, com.vaadin.flow.data.provider.HasListDataView<T,CheckboxGroupListDataView<T>>, com.vaadin.flow.data.selection.MultiSelect<CheckboxGroup<T>,T>, Serializable
@Tag("vaadin-checkbox-group") @NpmPackage(value="@vaadin/polymer-legacy-adapter",version="24.8.0") @NpmPackage(value="@vaadin/checkbox-group",version="24.8.0") @JsModule("@vaadin/polymer-legacy-adapter/style-modules.js") @JsModule("@vaadin/checkbox-group/src/vaadin-checkbox-group.js") public class CheckboxGroup<T> extends com.vaadin.flow.component.AbstractSinglePropertyField<CheckboxGroup<T>,Set<T>> implements com.vaadin.flow.component.HasAriaLabel, HasClientValidation, com.vaadin.flow.data.provider.HasDataView<T,Void,CheckboxGroupDataView<T>>, com.vaadin.flow.data.binder.HasItemComponents<T>, InputField<com.vaadin.flow.component.AbstractField.ComponentValueChangeEvent<CheckboxGroup<T>,Set<T>>,Set<T>>, com.vaadin.flow.data.provider.HasListDataView<T,CheckboxGroupListDataView<T>>, HasThemeVariant<CheckboxGroupVariant>, HasValidationProperties, com.vaadin.flow.data.binder.HasValidator<Set<T>>, com.vaadin.flow.data.selection.MultiSelect<CheckboxGroup<T>,T>
CheckBoxGroup is a multi-selection component where items are displayed as check boxes.

Use CheckBoxGroup to group related items. Individual checkboxes should be used for options that are not related to each other in any way.

Validation

CheckboxGroup comes with a built-in validation mechanism that verifies that at least one checkbox is selected when required is enabled.

Validation is triggered whenever the user initiates a value change by toggling a checkbox. Programmatic value changes trigger validation as well. If validation fails, the component is marked as invalid and an error message is displayed below the group.

The required error message can be configured using either CheckboxGroup.CheckboxGroupI18n.setRequiredErrorMessage(String) or HasValidationProperties.setErrorMessage(String).

For more advanced validation that requires custom rules, you can use Binder. Please note that Binder provides its own API for the required validation, see asRequired().

However, if Binder doesn't fit your needs and you want to implement fully custom validation logic, you can disable the built-in validation by setting setManualValidation(boolean) to true. This will allow you to control the invalid state and the error message manually using HasValidationProperties.setInvalid(boolean) and HasValidationProperties.setErrorMessage(String) API.

Author:
Vaadin Ltd
See Also:

  • Nested Class Summary

    Nested Classes
    Modifier and Type
    Class
    Description
    static class 
    CheckboxGroup.CheckboxGroupI18n
    The internationalization properties for CheckboxGroup.
    static interface 
    CheckboxGroup.ItemHelperGenerator<T>
    CheckboxGroup.ItemHelperGenerator can be used to generate helper text strings used by the checkbox group for each checkbox.

    Nested classes/interfaces inherited from class com.vaadin.flow.component.AbstractField

    com.vaadin.flow.component.AbstractField.ComponentValueChangeEvent<C extends com.vaadin.flow.component.Component,V extends Object>

    Nested classes/interfaces inherited from interface com.vaadin.flow.component.shared.HasClientValidation

    HasClientValidation.ClientValidatedEvent

    Nested classes/interfaces inherited from interface com.vaadin.flow.data.binder.HasItemComponents

    com.vaadin.flow.data.binder.HasItemComponents.ItemComponent<T extends Object>

    Nested classes/interfaces inherited from interface com.vaadin.flow.component.HasValue

    com.vaadin.flow.component.HasValue.ValueChangeEvent<V extends Object>, com.vaadin.flow.component.HasValue.ValueChangeListener<E extends com.vaadin.flow.component.HasValue.ValueChangeEvent<?>>

  • Constructor Summary

    Constructors
    Constructor
    Description
    CheckboxGroup()
    Creates an empty checkbox group
    CheckboxGroup(com.vaadin.flow.component.HasValue.ValueChangeListener<com.vaadin.flow.component.AbstractField.ComponentValueChangeEvent<CheckboxGroup<T>,Set<T>>> listener)
    Constructs a checkbox group with a value change listener.
    CheckboxGroup(String label)
    Creates an empty checkbox group with the defined label.
    CheckboxGroup(String label, com.vaadin.flow.component.HasValue.ValueChangeListener<com.vaadin.flow.component.AbstractField.ComponentValueChangeEvent<CheckboxGroup<T>,Set<T>>> listener)
    Constructs a checkbox group with the defined label and a value change listener.
    CheckboxGroup(String label, com.vaadin.flow.component.HasValue.ValueChangeListener<com.vaadin.flow.component.AbstractField.ComponentValueChangeEvent<CheckboxGroup<T>,Set<T>>> listener, T... items)
    Constructs a checkbox group with the defined label, a value change listener and populated with the items in the array.
    CheckboxGroup(String label, Collection<T> items)
    Creates a checkbox group with the defined label and populated with the items in the collection.
    CheckboxGroup(String label, T... items)
    Creates a checkbox group with the defined label and populated with the items in the array.

  • Method Summary

    Modifier and Type
    Method
    Description
    com.vaadin.flow.shared.Registration
    addSelectionListener(com.vaadin.flow.data.selection.MultiSelectionListener<CheckboxGroup<T>,T> listener)
     
    Optional<String>
    getAriaLabel()
     
    Optional<String>
    getAriaLabelledBy()
     
    com.vaadin.flow.data.provider.DataProvider<T,?>
    getDataProvider()
    Gets the data provider used by this CheckboxGroup.
    com.vaadin.flow.data.binder.Validator<Set<T>>
    getDefaultValidator()
     
    CheckboxGroupDataView<T>
    getGenericDataView()
    Gets the generic data view for the checkbox group.
    CheckboxGroup.CheckboxGroupI18n
    getI18n()
    Gets the internationalization object previously set for this component.
    com.vaadin.flow.function.SerializablePredicate<T>
    getItemEnabledProvider()
    Returns the item enabled predicate.
    CheckboxGroup.ItemHelperGenerator<T>
    getItemHelperGenerator()
    Gets the CheckboxGroup.ItemHelperGenerator function that is used for generating helper text strings used by the checkbox group for each item.
    com.vaadin.flow.component.ItemLabelGenerator<T>
    getItemLabelGenerator()
    Gets the item label generator that is used to produce the strings shown in the checkbox group for each item.
    ComponentRenderer<? extends com.vaadin.flow.component.Component,T>
    getItemRenderer()
    Returns the item component renderer.
    String
    getLabel()
    Gets the label of the checkbox group.
    CheckboxGroupListDataView<T>
    getListDataView()
    Gets the list data view for the checkbox group.
    Set<T>
    getSelectedItems()
     
    SelectionPreservationMode
    getSelectionPreservationMode()
    Gets the selection preservation mode.
    protected boolean
    hasValidValue()
     
    protected boolean
    isDisabledBoolean()
    If true, the user cannot interact with this element.
    boolean
    isRequired()
    Alias for isRequiredIndicatorVisible()
    boolean
    isRequiredIndicatorVisible()
    Gets whether the user is required to select at least one checkbox.
    void
    onEnabledStateChanged(boolean enabled)
     
    void
    setAriaLabel(String ariaLabel)
     
    void
    setAriaLabelledBy(String labelledBy)
     
    void
    setDataProvider(com.vaadin.flow.data.provider.DataProvider<T,?> dataProvider)
    Sets a generic data provider for the CheckboxGroup to use.
    protected void
    setDisabled(boolean disabled)
    If true, the user cannot interact with this element.
    void
    setI18n(CheckboxGroup.CheckboxGroupI18n i18n)
    Sets the internationalization object for this component.
    void
    setItemEnabledProvider(com.vaadin.flow.function.SerializablePredicate<T> itemEnabledProvider)
    Sets the item enabled predicate for this checkbox group.
    void
    setItemHelperGenerator(CheckboxGroup.ItemHelperGenerator<T> itemHelperGenerator)
    Sets the CheckboxGroup.ItemHelperGenerator that is used for generating helper text strings used by the checkbox group for each item.
    void
    setItemLabelGenerator(com.vaadin.flow.component.ItemLabelGenerator<T> itemLabelGenerator)
    Sets the item label generator that is used to produce the strings shown in the checkbox group for each item.
    CheckboxGroupDataView<T>
    setItems(com.vaadin.flow.data.provider.DataProvider<T,Void> dataProvider)
     
    CheckboxGroupDataView<T>
    setItems(com.vaadin.flow.data.provider.InMemoryDataProvider<T> inMemoryDataProvider)
     
    CheckboxGroupListDataView<T>
    setItems(com.vaadin.flow.data.provider.ListDataProvider<T> dataProvider)
     
    void
    setLabel(String label)
    Sets the label for the checkbox group.
    void
    setManualValidation(boolean enabled)
     
    void
    setRenderer(ComponentRenderer<? extends com.vaadin.flow.component.Component,T> renderer)
    Sets the item renderer for this checkbox group.
    void
    setRequired(boolean required)
    Alias for setRequiredIndicatorVisible(boolean).
    void
    setRequiredIndicatorVisible(boolean required)
    Sets whether the user is required to select at least one checkbox.
    void
    setSelectionPreservationMode(SelectionPreservationMode selectionPreservationMode)
    Sets the selection preservation mode.
    void
    setValue(Set<T> value)
    Sets the value of this component.
    void
    updateSelection(Set<T> addedItems, Set<T> removedItems)
     
    protected void
    validate()
    Validates the current value against the constraints and sets the invalid property and the errorMessage property based on the result.
    protected boolean
    valueEquals(Set<T> value1, Set<T> value2)
     

    Methods inherited from class com.vaadin.flow.component.AbstractSinglePropertyField

    getSynchronizationRegistration, setPresentationValue, setSynchronizedEvent

    Methods inherited from class com.vaadin.flow.component.AbstractField

    addValueChangeListener, getEmptyValue, getValue, isEmpty, setModelValue

    Methods inherited from class com.vaadin.flow.component.Component

    addListener, findAncestor, fireEvent, from, get, getChildren, getElement, getEventBus, getId, getListeners, getLocale, getParent, getTranslation, getTranslation, getTranslation, getTranslation, getTranslation, getTranslation, getUI, hasListener, isAttached, isTemplateMapped, isVisible, onAttach, onDetach, removeFromParent, scrollIntoView, scrollIntoView, set, setElement, setId, setVisible

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    Methods inherited from interface com.vaadin.flow.component.AttachNotifier

    addAttachListener

    Methods inherited from interface com.vaadin.flow.component.DetachNotifier

    addDetachListener

    Methods inherited from interface com.vaadin.flow.component.shared.HasClientValidation

    addClientValidatedEventListener

    Methods inherited from interface com.vaadin.flow.component.HasComponents

    add, add, add, addComponentAsFirst, addComponentAtIndex, remove, remove, removeAll

    Methods inherited from interface com.vaadin.flow.component.HasElement

    getElement

    Methods inherited from interface com.vaadin.flow.component.HasEnabled

    isEnabled, setEnabled

    Methods inherited from interface com.vaadin.flow.component.HasHelper

    getHelperComponent, getHelperText, setHelperComponent, setHelperText

    Methods inherited from interface com.vaadin.flow.data.binder.HasItemComponents

    addComponents, getItemPosition, prependComponents

    Methods inherited from interface com.vaadin.flow.data.provider.HasListDataView

    setItems, setItems

    Methods inherited from interface com.vaadin.flow.component.HasSize

    getHeight, getHeightUnit, getMaxHeight, getMaxWidth, getMinHeight, getMinWidth, getWidth, getWidthUnit, setHeight, setHeight, setHeightFull, setMaxHeight, setMaxHeight, setMaxWidth, setMaxWidth, setMinHeight, setMinHeight, setMinWidth, setMinWidth, setSizeFull, setSizeUndefined, setWidth, setWidth, setWidthFull

    Methods inherited from interface com.vaadin.flow.component.HasStyle

    addClassName, addClassNames, getClassName, getClassNames, getStyle, hasClassName, removeClassName, removeClassNames, setClassName, setClassName

    Methods inherited from interface com.vaadin.flow.component.HasTheme

    addThemeName, addThemeNames, getThemeName, getThemeNames, hasThemeName, removeThemeName, removeThemeNames, setThemeName, setThemeName

    Methods inherited from interface com.vaadin.flow.component.shared.HasThemeVariant

    addThemeVariants, removeThemeVariants

    Methods inherited from interface com.vaadin.flow.component.shared.HasTooltip

    getTooltip, setTooltipText

    Methods inherited from interface com.vaadin.flow.component.shared.HasValidationProperties

    getErrorMessage, isInvalid, setErrorMessage, setInvalid

    Methods inherited from interface com.vaadin.flow.data.binder.HasValidator

    addValidationStatusChangeListener

    Methods inherited from interface com.vaadin.flow.component.HasValue

    addValueChangeListener, clear, getOptionalValue, isEmpty

    Methods inherited from interface com.vaadin.flow.component.HasValueAndElement

    isReadOnly, setReadOnly

    Methods inherited from interface com.vaadin.flow.data.selection.MultiSelect

    deselect, deselect, deselectAll, getEmptyValue, getValue, isSelected, select, select

  • Constructor Details

    • CheckboxGroup

      public CheckboxGroup()
      Creates an empty checkbox group

    • CheckboxGroup

      public CheckboxGroup(String label)
      Creates an empty checkbox group with the defined label.
      Parameters:
      label - the label describing the checkbox group
      See Also:

    • CheckboxGroup

      public CheckboxGroup(String label, Collection<T> items)
      Creates a checkbox group with the defined label and populated with the items in the collection.
      Parameters:
      label - the label describing the checkbox group
      items - the items to be shown in the list of the checkbox group
      See Also:

    • CheckboxGroup

      @SafeVarargs public CheckboxGroup(String label, T... items)
      Creates a checkbox group with the defined label and populated with the items in the array.
      Parameters:
      label - the label describing the checkbox group
      items - the items to be shown in the list of the checkbox group
      See Also:

    • CheckboxGroup

      public CheckboxGroup(com.vaadin.flow.component.HasValue.ValueChangeListener<com.vaadin.flow.component.AbstractField.ComponentValueChangeEvent<CheckboxGroup<T>,Set<T>>> listener)
      Constructs a checkbox group with a value change listener.
      Parameters:
      listener - the value change listener to add
      See Also:
      • AbstractField.addValueChangeListener(ValueChangeListener)

    • CheckboxGroup

      public CheckboxGroup(String label, com.vaadin.flow.component.HasValue.ValueChangeListener<com.vaadin.flow.component.AbstractField.ComponentValueChangeEvent<CheckboxGroup<T>,Set<T>>> listener)
      Constructs a checkbox group with the defined label and a value change listener.
      Parameters:
      label - the label describing the checkbox group
      listener - the value change listener to add
      See Also:

    • CheckboxGroup

      @SafeVarargs public CheckboxGroup(String label, com.vaadin.flow.component.HasValue.ValueChangeListener<com.vaadin.flow.component.AbstractField.ComponentValueChangeEvent<CheckboxGroup<T>,Set<T>>> listener, T... items)
      Constructs a checkbox group with the defined label, a value change listener and populated with the items in the array.
      Parameters:
      label - the label describing the checkbox group
      listener - the value change listener to add
      items - the items to be shown in the list of the checkbox group
      See Also:
      • setLabel(String)
      • AbstractField.addValueChangeListener(ValueChangeListener)
      • HasListDataView.setItems(Object...)

  • Method Details

    • setItems

      public CheckboxGroupDataView<T> setItems(com.vaadin.flow.data.provider.DataProvider<T,Void> dataProvider)
      Specified by:
      setItems in interface com.vaadin.flow.data.provider.HasDataView<T,Void,CheckboxGroupDataView<T>>

    • setItems

      public CheckboxGroupDataView<T> setItems(com.vaadin.flow.data.provider.InMemoryDataProvider<T> inMemoryDataProvider)
      Specified by:
      setItems in interface com.vaadin.flow.data.provider.HasDataView<T,Void,CheckboxGroupDataView<T>>

    • setItems

      public CheckboxGroupListDataView<T> setItems(com.vaadin.flow.data.provider.ListDataProvider<T> dataProvider)
      Specified by:
      setItems in interface com.vaadin.flow.data.provider.HasListDataView<T,CheckboxGroupListDataView<T>>

    • getListDataView

      public CheckboxGroupListDataView<T> getListDataView()
      Gets the list data view for the checkbox group. This data view should only be used when the items are in-memory and set with: If the items are not in-memory an exception is thrown.
      Specified by:
      getListDataView in interface com.vaadin.flow.data.provider.HasListDataView<T,CheckboxGroupListDataView<T>>
      Returns:
      the list data view that provides access to the data bound to the checkbox group

    • getGenericDataView

      public CheckboxGroupDataView<T> getGenericDataView()
      Gets the generic data view for the checkbox group. This data view should only be used when getListDataView() is not applicable for the underlying data provider.
      Specified by:
      getGenericDataView in interface com.vaadin.flow.data.provider.HasDataView<T,Void,CheckboxGroupDataView<T>>
      Returns:
      the generic DataView instance implementing CheckboxGroupDataView

    • setDataProvider

      public void setDataProvider(com.vaadin.flow.data.provider.DataProvider<T,?> dataProvider)
      Sets a generic data provider for the CheckboxGroup to use.

      Use this method when none of the setItems methods are applicable, e.g. when having a data provider with filter that cannot be transformed to DataProvider<T, Void>.

      Parameters:
      dataProvider - DataProvider instance to use, not null

    • updateSelection

      public void updateSelection(Set<T> addedItems, Set<T> removedItems)
      Specified by:
      updateSelection in interface com.vaadin.flow.data.selection.MultiSelect<CheckboxGroup<T>,T>

    • setValue

      public void setValue(Set<T> value)
      Sets the value of this component. If the new value is not equal to the previous value, fires a value change event.

      The component doesn't accept null values. The value of a checkbox group without any selected items is an empty set. You can use the HasValue.clear() method to set the empty value.

      Specified by:
      setValue in interface com.vaadin.flow.component.HasValue<com.vaadin.flow.component.AbstractField.ComponentValueChangeEvent<CheckboxGroup<T>,Set<T>>,Set<T>>
      Specified by:
      setValue in interface com.vaadin.flow.data.selection.MultiSelect<CheckboxGroup<T>,T>
      Overrides:
      setValue in class com.vaadin.flow.component.AbstractField<CheckboxGroup<T>,Set<T>>
      Parameters:
      value - the new value to set, not null
      Throws:
      NullPointerException - if value is null

    • getSelectedItems

      public Set<T> getSelectedItems()
      Specified by:
      getSelectedItems in interface com.vaadin.flow.data.selection.MultiSelect<CheckboxGroup<T>,T>

    • addSelectionListener

      public com.vaadin.flow.shared.Registration addSelectionListener(com.vaadin.flow.data.selection.MultiSelectionListener<CheckboxGroup<T>,T> listener)
      Specified by:
      addSelectionListener in interface com.vaadin.flow.data.selection.MultiSelect<CheckboxGroup<T>,T>

    • getDataProvider

      public com.vaadin.flow.data.provider.DataProvider<T,?> getDataProvider()
      Gets the data provider used by this CheckboxGroup.

      To get information and control over the items in the CheckboxGroup, use either getListDataView() or getGenericDataView() instead.

      Returns:
      the data provider used by this CheckboxGroup

    • onEnabledStateChanged

      public void onEnabledStateChanged(boolean enabled)
      Overrides:
      onEnabledStateChanged in class com.vaadin.flow.component.Component

    • getItemEnabledProvider

      public com.vaadin.flow.function.SerializablePredicate<T> getItemEnabledProvider()
      Returns the item enabled predicate.
      Returns:
      the item enabled predicate
      See Also:

    • setItemEnabledProvider

      public void setItemEnabledProvider(com.vaadin.flow.function.SerializablePredicate<T> itemEnabledProvider)
      Sets the item enabled predicate for this checkbox group. The predicate is applied to each item to determine whether the item should be enabled (true) or disabled (false). Disabled items are displayed as grayed out and the user cannot select them. The default predicate always returns true (all the items are enabled).
      Parameters:
      itemEnabledProvider - the item enable predicate, not null

    • setItemLabelGenerator

      public void setItemLabelGenerator(com.vaadin.flow.component.ItemLabelGenerator<T> itemLabelGenerator)
      Sets the item label generator that is used to produce the strings shown in the checkbox group for each item. By default, String.valueOf(Object) is used.

      Setting an item label generator removes any previously set item renderer.

      Parameters:
      itemLabelGenerator - the item label provider to use, not null

    • getItemLabelGenerator

      public com.vaadin.flow.component.ItemLabelGenerator<T> getItemLabelGenerator()
      Gets the item label generator that is used to produce the strings shown in the checkbox group for each item.
      Returns:
      the item label generator used, not null

    • setItemHelperGenerator

      public void setItemHelperGenerator(CheckboxGroup.ItemHelperGenerator<T> itemHelperGenerator)
      Sets the CheckboxGroup.ItemHelperGenerator that is used for generating helper text strings used by the checkbox group for each item.
      Parameters:
      itemHelperGenerator - the item helper generator to use, not null
      Since:
      24.4
      See Also:

    • getItemHelperGenerator

      public CheckboxGroup.ItemHelperGenerator<T> getItemHelperGenerator()
      Gets the CheckboxGroup.ItemHelperGenerator function that is used for generating helper text strings used by the checkbox group for each item.
      Returns:
      the item helper generator, not null
      Since:
      24.4
      See Also:

    • setLabel

      public void setLabel(String label)
      Sets the label for the checkbox group.
      Specified by:
      setLabel in interface com.vaadin.flow.component.HasLabel
      Parameters:
      label - value for the label property in the checkbox group

    • getLabel

      public String getLabel()
      Gets the label of the checkbox group.
      Specified by:
      getLabel in interface com.vaadin.flow.component.HasLabel
      Returns:
      the label property of the checkbox group

    • setAriaLabel

      public void setAriaLabel(String ariaLabel)
      Specified by:
      setAriaLabel in interface com.vaadin.flow.component.HasAriaLabel

    • getAriaLabel

      public Optional<String> getAriaLabel()
      Specified by:
      getAriaLabel in interface com.vaadin.flow.component.HasAriaLabel

    • setAriaLabelledBy

      public void setAriaLabelledBy(String labelledBy)
      Specified by:
      setAriaLabelledBy in interface com.vaadin.flow.component.HasAriaLabel

    • getAriaLabelledBy

      public Optional<String> getAriaLabelledBy()
      Specified by:
      getAriaLabelledBy in interface com.vaadin.flow.component.HasAriaLabel

    • setRequiredIndicatorVisible

      public void setRequiredIndicatorVisible(boolean required)
      Sets whether the user is required to select at least one checkbox. When required, an indicator appears next to the label and the field invalidates if all previously selected checkboxes are deselected.

      NOTE: The required indicator is only visible when the field has a label, see setLabel(String).

      Specified by:
      setRequiredIndicatorVisible in interface com.vaadin.flow.component.HasValue<com.vaadin.flow.component.AbstractField.ComponentValueChangeEvent<CheckboxGroup<T>,Set<T>>,Set<T>>
      Specified by:
      setRequiredIndicatorVisible in interface com.vaadin.flow.component.HasValueAndElement<com.vaadin.flow.component.AbstractField.ComponentValueChangeEvent<CheckboxGroup<T>,Set<T>>,Set<T>>
      Parameters:
      required - true to make the field required, false otherwise
      See Also:

    • isRequiredIndicatorVisible

      public boolean isRequiredIndicatorVisible()
      Gets whether the user is required to select at least one checkbox.
      Specified by:
      isRequiredIndicatorVisible in interface com.vaadin.flow.component.HasValue<com.vaadin.flow.component.AbstractField.ComponentValueChangeEvent<CheckboxGroup<T>,Set<T>>,Set<T>>
      Specified by:
      isRequiredIndicatorVisible in interface com.vaadin.flow.component.HasValueAndElement<com.vaadin.flow.component.AbstractField.ComponentValueChangeEvent<CheckboxGroup<T>,Set<T>>,Set<T>>
      Returns:
      true if the field is required, false otherwise
      See Also:

    • isRequired

      public boolean isRequired()
      Alias for isRequiredIndicatorVisible()
      Returns:
      true if the field is required, false otherwise

    • setRequired

      public void setRequired(boolean required)
      Alias for setRequiredIndicatorVisible(boolean).
      Parameters:
      required - true to make the field required, false otherwise

    • setDisabled

      protected void setDisabled(boolean disabled)
      If true, the user cannot interact with this element.
      Parameters:
      disabled - the boolean value to set

    • isDisabledBoolean

      protected boolean isDisabledBoolean()
      If true, the user cannot interact with this element.
      Returns:
      the disabled property from the webcomponent

    • valueEquals

      protected boolean valueEquals(Set<T> value1, Set<T> value2)
      Overrides:
      valueEquals in class com.vaadin.flow.component.AbstractField<CheckboxGroup<T>,Set<T>>

    • hasValidValue

      protected boolean hasValidValue()
      Overrides:
      hasValidValue in class com.vaadin.flow.component.AbstractSinglePropertyField<CheckboxGroup<T>,Set<T>>

    • getItemRenderer

      public ComponentRenderer<? extends com.vaadin.flow.component.Component,T> getItemRenderer()
      Returns the item component renderer.
      Returns:
      the item renderer
      Since:
      23.1
      See Also:

    • setRenderer

      public void setRenderer(ComponentRenderer<? extends com.vaadin.flow.component.Component,T> renderer)
      Sets the item renderer for this checkbox group. The renderer is applied to each item to create a component which represents the item.

      Note: Component acts as a label to the checkbox and clicks on it trigger the checkbox. Hence interactive components like DatePicker or ComboBox cannot be used.

      Parameters:
      renderer - the item renderer, not null
      Since:
      23.1

    • setSelectionPreservationMode

      public void setSelectionPreservationMode(SelectionPreservationMode selectionPreservationMode)
      Sets the selection preservation mode. Determines what happens with the selection when DataProvider.refreshAll() is called. The selection is discarded in any case when a new data provider is set. The default is SelectionPreservationMode.DISCARD.
      Parameters:
      selectionPreservationMode - the selection preservation mode to switch to, not null
      See Also:

    • getSelectionPreservationMode

      public SelectionPreservationMode getSelectionPreservationMode()
      Gets the selection preservation mode.
      Returns:
      the selection preservation mode
      See Also:

    • setManualValidation

      public void setManualValidation(boolean enabled)
      Specified by:
      setManualValidation in interface com.vaadin.flow.component.HasValidation

    • getDefaultValidator

      public com.vaadin.flow.data.binder.Validator<Set<T>> getDefaultValidator()
      Specified by:
      getDefaultValidator in interface com.vaadin.flow.data.binder.HasValidator<T>

    • validate

      protected void validate()
      Validates the current value against the constraints and sets the invalid property and the errorMessage property based on the result. If a custom error message is provided with HasValidationProperties.setErrorMessage(String), it is used. Otherwise, the error message defined in the i18n object is used.

      The method does nothing if the manual validation mode is enabled.

    • getI18n

      public CheckboxGroup.CheckboxGroupI18n getI18n()
      Gets the internationalization object previously set for this component.

      NOTE: Updating the instance that is returned from this method will not update the component if not set again using setI18n(CheckboxGroupI18n)

      Returns:
      the i18n object or null if no i18n object has been set

    • setI18n

      public void setI18n(CheckboxGroup.CheckboxGroupI18n i18n)
      Sets the internationalization object for this component.
      Parameters:
      i18n - the i18n object, not null