ValuesPicker

The ValuesPicker component works with a list of values of any type. It consists of the text field and the set of buttons defined by actions.

ValuesPicker is convenient to use if you need to edit the list of values through actions, not in the text field.

ValuesPicker is a base class for TagPicker. Has the same API as ValuePicker.

Component’s XML-name: valuesPicker.

Basics

ValuesPicker can have a caption, description, and both custom and predefined actions:

values picker1

An example of defining ValuesPicker with a caption retrieved from localized messages and two actions:

<valuesPicker id="stringsValuesPicker"
              caption="Favourite colors">
    <actions>
        <action id="select" type="values_select">
            <properties>
                <property name="javaClass" value="java.lang.String"/>
            </properties>
        </action>
        <action id="clear" type="value_clear"/>
    </actions>
</valuesPicker>

Actions

You can define custom and predefined actions for ValuesPicker displayed as buttons on the right. You can do it either in the XML descriptor using the actions nested element or programmatically in the controller using the addAction() method.

Predefined Actions

The framework provides value_clear and values_select predefined actions.

The values_select action sets a value to ValuesPicker using a value selection screen. The value selection screen generates a specific component to select or create a value depending on the passed value type.

The values_select action can be used to select any type of value, for example:

  • Java types, like String, Integer, Long, Double, BigDecimal, Date, LocalDate, LocalTime, LocalDateTime, OffsetTime, OffsetDateTime, Date, Time, UUID and java.sql.Date, java.sql.Time.

    Use the javaClass property to set the Java class used as the type of selected value.

    In the previous example, the values_select action uses the java.lang.String Java type. When the user clicks on the value selection button, the Select Value screen appears. The user can create and add some value to a result list on this screen or remove a value from the list. The user can add a value either by clicking the Add button or by pressing Enter.

    valuesPicker

    For the UUID Java type, MaskedField is generated on the Select Value screen.

    For the date types, DateField is generated.

    Use the resolution property to set the resolution of the DateField component:

    <action id="select" type="values_select">
        <properties>
            <property name="javaClass" value="java.util.Date"/>
            <property name="resolution" value="MONTH"/>
        </properties>
    </action>

    Use the timeZone property to set the time zone of the DateField component.

    For the time types, TimeField is generated.

    For other types, TextField is generated.

  • Enum values

    Use the enumClass property to set the enumeration class used as the type of selected value.

    <valuesPicker id="valuePicker"
                  caption="Hobbies">
        <actions>
            <action id="select" type="values_select">
                <properties>
                    <property name="enumClass" value="ui.ex1.entity.Hobby"/>
                </properties>
            </action>
            <action id="clear" type="value_clear"/>
        </actions>
    </valuesPicker>

    For enum values, ComboBox is generated on the Select Value screen.

    values picker enum
  • Entity instances

    Use the entityName property to set the entity name used as the type of selected value.

    <valuesPicker id="valuePickerEnt">
        <actions>
            <action id="select" type="values_select">
                <properties>
                    <property name="entityName" value="uiex1_User"/>
                    <property name="useComboBox" value="true"/>
                </properties>
            </action>
            <action id="clear" type="value_clear"/>
        </actions>
    </valuesPicker>

    The useComboBox property specifies whether ComboBox should be used in the value selection screen. The default value is false.

    The lookupScreenId property sets the lookup screen id to be passed into the value selection screen to select entity values.

The value selection screen implements the SelectValueController interface.

Use the selectValueScreenId property to set the id of a screen that implements the SelectValueController interface.

Use the selectValueScreenClass property to set the class of a screen that implements the SelectValueController interface.

Custom Actions

Custom actions for ValuesPicker are similar to custom actions for ValuePicker.

Validation

To check values entered into the ValuesPicker component, you can use a validator in a nested validators element.

The following predefined validators are available for ValuesPicker:

In the example below, we will show a SizeValidator usage for validatedCheckBoxGroup:

<checkBoxGroup id="validatedCheckBoxGroup"
               optionsContainer="customersDc"
               caption="The number of customers is limited from 2 to 5">
    <validators>
        <size min="2" max="5"/>
    </validators>
</checkBoxGroup>

Events and Handlers

Чтобы сгенерировать заглушку слушателя в Jmix Studio, выберите компонент в XML-дескрипторе экрана или на панели Component Hierarchy и используйте вкладку Handlers панели Component Inspector.

В качестве альтернативы вы можете воспользоваться кнопкой Generate Handler на верхней панели контроллера экрана.

ContextHelpIconClickHandler

FieldIconProvider

FieldValueChangeEvent

Formatter

See Formatter.

Validator

Adds a validator instance to the component. The validator must throw ValidationException if the value is not valid.

If you are not satisfied with the predefined validators, add your own validator instance:

@Install(to = "validCheckBoxGroup", subject = "validator")
protected void validCheckBoxGroupValidator(Collection<EducationalStage> value) {
    if (value.contains(EducationalStage.NO) & value.size() > 1)
        throw new ValidationException("You cannot select the No Education " +
                "value together with other values");
}

ValueChangeEvent

ValuesPicker XML Attributes

Просматривать и редактировать атрибуты, применимые к компоненту, можно с помощью панели Component Inspector конструктора экранов Studio.

ValuesPicker XML Elements