com.vaadin.flow.component

Interface HasValueAndElement<E extends HasValue.ValueChangeEvent<V>,V>

Type Parameters:

E - the value change event type

V - the value type

All Superinterfaces:

HasElement, HasEnabled, HasValue<E,V>, Serializable

All Known Subinterfaces:

MultiSelect<C,T>, SingleSelect<C,T>

All Known Implementing Classes:

AbstractCompositeField, AbstractField, AbstractSinglePropertyField, Checkbox, ComboBox, DatePicker, GeneratedVaadinCheckbox, GeneratedVaadinComboBox, GeneratedVaadinDatePicker, GeneratedVaadinPasswordField, GeneratedVaadinRadioGroup, GeneratedVaadinTextArea, GeneratedVaadinTextField, Input, ListBox, PasswordField, RadioButtonGroup, TextArea, TextField

public interface HasValueAndElement<E extends HasValue.ValueChangeEvent<V>,V>
extends HasValue<E,V>, HasElement, HasEnabled

A component that has a value.

Since:

1.0

Author:

Vaadin Ltd

Nested Class Summary

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

HasValue.ValueChangeEvent<V>, HasValue.ValueChangeListener<E extends HasValue.ValueChangeEvent<?>>

Method Summary

Modifier and Type	Method and Description
default boolean	isReadOnly() Returns whether this HasValue is in read-only mode or not.
default boolean	isRequiredIndicatorVisible() Checks whether the required indicator is visible.
default void	setReadOnly(boolean readOnly) Sets the read-only mode of this HasValue to given mode.
default void	setRequiredIndicatorVisible(boolean requiredIndicatorVisible) Sets the required indicator visible or not.

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

addValueChangeListener, clear, getEmptyValue, getOptionalValue, getValue, isEmpty, setValue

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

isEnabled, setEnabled

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

getElement

Method Detail

setRequiredIndicatorVisible

default void setRequiredIndicatorVisible(boolean requiredIndicatorVisible)

Description copied from interface: HasValue

Sets the required indicator visible or not.

If set visible, it is visually indicated in the user interface.

The method is intended to be used with Binder which does server-side validation. In case HTML element has its own (client-side) validation it should be disabled when setRequiredIndicatorVisible(true) is called and re-enabled back on setRequiredIndicatorVisible(false). It's responsibility of each component implementation to follow the contract so that the method call doesn't do anything else than show/hide the "required" indication. Usually components provide their own setRequired method which should be called in case the client-side validation is required.

Specified by:

setRequiredIndicatorVisible in interface HasValue<E extends HasValue.ValueChangeEvent<V>,V>

Parameters:

requiredIndicatorVisible - true to make the required indicator visible, false if not

isRequiredIndicatorVisible

default boolean isRequiredIndicatorVisible()

Description copied from interface: HasValue

Checks whether the required indicator is visible.

Specified by:

isRequiredIndicatorVisible in interface HasValue<E extends HasValue.ValueChangeEvent<V>,V>

Returns:

true if visible, false if not

setReadOnly

default void setReadOnly(boolean readOnly)

Description copied from interface: HasValue

Sets the read-only mode of this HasValue to given mode. The user can't change the value when in read-only mode.

A HasValue with a visual component in read-only mode typically looks visually different to signal to the user that the value cannot be edited.

Specified by:

setReadOnly in interface HasValue<E extends HasValue.ValueChangeEvent<V>,V>

Parameters:

readOnly - a boolean value specifying whether the component is put read-only mode or not

isReadOnly

default boolean isReadOnly()

Description copied from interface: HasValue

Returns whether this HasValue is in read-only mode or not.

Specified by:

isReadOnly in interface HasValue<E extends HasValue.ValueChangeEvent<V>,V>

Returns:

false if the user can modify the value, true if not.