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### 6.11.3. < rich:comboBox > available since 3.2.0

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#### 6.11.3.1. Description

The <rich:comboBox> component allows to create a combobox element with the built-in Ajax capability.

Figure 6.128. <rich:comboBox> component

#### 6.11.3.2. Key Features

- Client-side suggestions

- Browser like selection

- Smart user-defined positioning

- Seam entity converter support

- Highly customizable look and feel

- Disablement support

#### 6.11.3.3. Details of Usage

The <rich:comboBox> is a simplified suggestion box component, that provides input with client-side suggestions. The component could be in two states:

- Default - only input and button is shown

- Input, button and a popup list of suggestions attached to input is shown

There are two ways to get values for the popup list of suggestions:

- Using the "suggestionValues" attribute, that defines the suggestion collection

      ...

      <rich:comboBox value="#{bean.state}" suggestionValues="#{bean.suggestions}" />

      ...

- Using the <f:selectItem /> or <f:selectItems /> JSF components.

      ...

      <rich:comboBox value="#{bean.state}" valueChangeListener="#{bean.selectionChanged}">

              <f:selectItems  value="#{bean.selectItems}"/>

              <f:selectItem itemValue="Oregon"/>

              <f:selectItem itemValue="Pennsylvania"/>

              <f:selectItem itemValue="Rhode Island"/>

              <f:selectItem itemValue="South Carolina"/>

      </rich:comboBox>

      ...

  ## Note:

  These JSF components consider only the "value" attribute for this component.

Popup list content loads at page render time. No additional requests could be performed on the popup calling.

The "value" attribute stores value from input after submit.

The "directInputSuggestions" attribute defines, how the first value from the suggested one appears in an input field. If it's "true" the first value appears with the suggested part highlighted.

    ...

    <rich:comboBox value="#{bean.state}" suggestionValues="#{bean.suggestions}" directInputSuggestions="true" />

    ...

This is a result:

Figure 6.129. <rich:comboBox> with "directInputSuggestions" attribute.

The "selectFirstOnUpdate" attribute defines if the first value from suggested is selected in a popup list. If it's "false" nothing is selected in the list before a user hovers some item with the mouse.

    ...

    <rich:comboBox value="#{bean.state}" suggestionValues="#{bean.suggestions}" selectFirstOnUpdate="false" />

    ...

This is a result:

Figure 6.130. <rich:comboBox> with "selectFirstOnUpdate" attribute.

The "defaultLabel" attribute defines the default label of the input element. Simple example is placed below.

    ...

    <rich:comboBox value="#{bean.state}" suggestionValues="#{bean.suggestions}" defaultLabel="Select a city..." />

    ...

This is a result:

Figure 6.131. <rich:comboBox> with "defaultLabel" attribute.

With the help of the "disabled" attribute you can disable the whole <rich:comboBox> component. See the following example.

    ...

    <rich:comboBox value="#{bean.state}" suggestionValues="#{bean.suggestions}" defaultLabel="Select a city..." disabled="true" />

    ...

This is a result:

Figure 6.132. <rich:comboBox> with "disabled" attribute.

The "enableManualInput" attribute enables/disables input field, so when `enableManualInput = "false"`, user can only pick the value manually and has no possibility to type in the value (default value is "false").

The <rich:comboBox> component provides to use specific event attributes:

- "onlistcall" which is fired before the list opening and gives you a possibility to cancel list popup/update

- "onselect" which gives you a possibility to send Ajax request when item is selected

The <rich:comboBox> component allows to use sizes attributes:

- "listWidth" and "listHeight" attributes specify popup list sizes with values in pixels

- "width" attribute customizes the size of input element with values in pixels.

#### 6.11.3.4. Reference Data

Table of <rich:comboBox> attributes.

Table 6.171. Component Identification Parameters

Name | Value
--- | ---
component-type | org.richfaces.ComboBox
component-class | org.richfaces.component.html.HtmlComboBox
component-family | org.richfaces.ComboBox
renderer-type | org.richfaces.renderkit.ComboBoxRenderer
tag-class | org.richfaces.taglib.ComboBoxTag

Table 6.172. JavaScript API

Function | Description
--- | ---
showList() | Shows the popup list
hideList() | Hides the popup list
enable() | Enables the control for input
disable() | Disables the control for input

Table 6.173. Style classes (selectors) with the corresponding skin parameters

Class (selector) name | Description | Skin Parameter | CSS properties mapped
--- | --- | --- | ---
input.rich-combobox-button-background, input.rich-combobox-button-background-disabled, input.rich-combobox-button-background-inactive | Define styles for a background of the combobox button, disabled button and inactive button respectively | tabBackgroundColor | background-color
input.rich-combobox-button-pressed-background | Define styles for a background of the pressed button | tabBackgroundColor | background-color
input.rich-combobox-button, input.rich-combobox-button-inactive, input.rich-combobox-button-disabled | Define styles for the combobox button, disabled button and inactive button respectively | panelBorderColor | border-top-color
panelBorderColor | border-left-color
.rich-combobox-font, input.rich-combobox-font | Define styles for a font | generalSizeFont | font-size
generalFamilyFont | font-family
generalTextColor | color
input.rich-combobox-font-disabled, .rich-combobox-font-disabled | Defines styles for a disabled font | headerFamilyFont | font-family
headerSizeFont | font-size
input.rich-combobox-font-inactive, .rich-combobox-font-inactive | Defines styles for an inactive font | generalSizeFont | font-size
generalFamilyFont | font-family
generalTextColor | color
.rich-combobox-item | Defines styles for an item | generalSizeFont | font-size
generalFamilyFont | font-family
generalTextColor | color
.rich-combobox-input, .rich-combobox-input-disabled, .rich-combobox-input-inactive | Define styles for an input field, a disabled input field, an inactive input field respectively | controlBackgroundColor | background-color
panelBorderColor | border-bottom-color
panelBorderColor | border-right-color
.rich-combobox-item-selected | Defines styles for a selected item | headerBackgroundColor | background-color, border-color
headerTextColor | color
.rich-combobox-list-decoration | Defines styles for a list decoration | panelBorderColor | border-color
tableBackgroundColor | background
input.rich-combobox-button-hovered | Defines styles for a hovered button | selectControlColor | border-color

Table 6.174. Style classes (selectors) without skin parameters

Class name | Description
--- | ---
.rich-combobox-shell | Defines styles for a wrapper <div> element of a list
.rich-combobox-list-position | Defines position of a list
.rich-combobox-list-scroll | Defines styles for a list scrolling
input.rich-combobox-button-icon | Defines styles for a button icon
input.rich-combobox-button-icon-inactive | Defines styles for an inactive button icon
input.rich-combobox-button-icon-disabled | Defines styles for a disabled button icon
.rich-combobox-shadow | Defines styles for a wrapper <div> element of a shadow
.rich-combobox-shadow-tl | Defines styles for a top-left element of a shadow
.rich-combobox-shadow-tr | Defines styles for a top-right element of a shadow
.rich-combobox-shadow-bl | Defines styles for a bottom-left element of a shadow
.rich-combobox-shadow-br | Defines styles for a bottom-right element of a shadow

You can find all necessary information about style classes redefinition in Definition of Custom Style Classes section.

#### 6.11.3.5. Relevant Resources Links

Visit the ComboBox page at RichFaces LiveDemo for examples of component usage and their sources.

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