java.lang.Object
- org.zkoss.zk.ui.AbstractComponent
- - org.zkoss.zk.ui.HtmlBasedComponent
  - - org.zkoss.zul.impl.XulElement
    - - org.zkoss.zul.impl.MeshElement
      - org.zkoss.zul.Listbox

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, org.zkoss.zk.ui.Component, org.zkoss.zk.ui.ext.Scope, org.zkoss.zk.ui.sys.ComponentCtrl, Paginated
```
public class Listbox
extends MeshElement
```
A listbox.
Event:
1. SelectEvent is sent when user changes the selection.
2. onAfterRender is sent when the model's data has been rendered.(since 5.0.4)
3. onCheckSelectAll is sent when user click on selectAll checkbox.(since 6.5.5)
See Specification.

Besides creating Listitem programmatically, you could assign a data model (a ListModel or GroupsModel instance) to a listbox via setModel(ListModel) or setModel(GroupsModel) and then the listbox will retrieve data via ListModel.getElementAt(int) when necessary.
Besides assign a list model, you could assign a renderer (a ListitemRenderer instance) to a listbox, such that the listbox will use this renderer to render the data returned by ListModel.getElementAt(int). If not assigned, the default renderer, which assumes a label per list item, is used. In other words, the default renderer adds a label to a Listitem by calling toString against the object returned by ListModel.getElementAt(int)

To retrieve what are selected in Listbox with a Selectable ListModel, you shall use Selectable.getSelection() to get what is currently selected object in ListModel rather than using getSelectedItems(). That is, you shall operate on the item of the ListModel rather than on the Listitem of the Listbox if you use the Selectable ListModel.
```
 Set selection = ((Selectable)getModel()).getSelection();
 
```
[Since 6.0.0] If a model is set, whether the listbox allows the multiple selection depends on Selectable.setMultiple(boolean). In other words, the application shall not access listbox directly if a model is assigned. Rather, the application shall access the model directly.
There are two ways to handle long content: scrolling and paging. If AbstractComponent.getMold() is "default", scrolling is used if setHeight(java.lang.String) is called and too much content to display. If AbstractComponent.getMold() is "paging", paging is used if two or more pages are required. To control the number of items to display in a page, use setPageSize(int).
If paging is used, the page controller is either created automatically or assigned explicitly by setPaginal(org.zkoss.zul.ext.Paginal). The paging controller specified explicitly by setPaginal(org.zkoss.zul.ext.Paginal) is called the external page controller. It is useful if you want to put the paging controller at different location (other than as a child component), or you want to use the same controller to control multiple listboxes.
Default getZclass(): z-listbox.(since 3.5.0)
To have a list box without stripping, you can specify a non-existent style class to setOddRowSclass(java.lang.String).
Clustering and Serialization

When used in a clustering environment, you have to make ListitemRenderer (setItemRenderer(org.zkoss.zul.ListitemRenderer<?>)) and ListModel ( setModel(org.zkoss.zul.ListModel<?>)) either serializable or re-assign them when sessionDidActivate(org.zkoss.zk.ui.Page) is called.
Render on Demand (rod)
[ZK EE] [Since 5.0.0]
For huge data, you can turn on Listbox's ROD to request ZK engine to load from ListModel only the required data chunk and create only the required Listitems in memory and render only the required DOM elements in browser. So it saves both the memory and the processing time in both server and browser for huge data. If you don't use the ListModel with the Listbox, turn on the ROD will still have ZK engine to render only a chunk of DOM elements in browser so it at least saves the memory and processing time in browser. Note that ROD works only if the Listbox is configured to has a limited "view port" height. That is, either the Listbox is in the "paging" mold or you have to setHeight(String),setVflex(String), or setRows(int) of the Listbox to make ROD works.

You can turn on/off ROD for all Listboxes in the application or only for a specific Listbox. To turn on ROD for all Listboxes in the application, you have to specify the Library Property "org.zkoss.zul.listbox.rod" to "true" in WEB-INF/zk.xml. If you did not specify the Library Property, default is false.
```
	<library-property>
		<name>org.zkoss.zul.listbox.rod</name>
		<value>true</value>
	</library-property>
 
```
To turn on ROD for a specific Listbox, you have to specify the Listbox's attribute map with key "org.zkoss.zul.listbox.rod" to true. That is, for example, if in a zul file, you shall specify <custom-attributes> of the Listbox like this:
```
	<listbox ...>
    <custom-attributes org.zkoss.zul.listbox.rod="true"/>
  </listbox>
 
```
You can mix the Library Property and <custom-attributes> ways together. The <custom-attributes> way always takes higher priority. So you can turn OFF ROD in general and turn ON only some specific Listbox component. Or you can turn ON ROD in general and turn OFF only some specific Listbox component.

Since only partial Listitems are created and rendered in the Listbox if you turn the ROD on, there will be some limitations on accessing Listitems. For example, if you call
```
 Listitem itemAt100 = (Listitem) getItemAtIndex(100);
 
```
The Listitem in index 100 is not necessary created yet if it is not in the current "view port" and you will get "null" instead.

And it is generally a bad idea to "cache" the created Listitem in your application if you turn the ROD on because Listitems might be removed later. Basically, you shall operate on the item of the ListModel rather than on the Listitem of the Listbox if you use the ListModel and ROD.

Custom Attributes
org.zkoss.zul.listbox.rightSelect

Specifies whether the selection shall be toggled when user right clicks on item, if the checkmark (isCheckmark()) is enabled.
Notice that you could specify this attribute in any of its ancestor's attributes. It will be inherited.

org.zkoss.zul.listbox.rod

Specifies whether to enable ROD (render-on-demand).
Notice that you could specify this attribute in any of its ancestor's attributes. It will be inherited.

org.zkoss.zul.listbox.autoSort
.(since 5.0.7)
Specifies whether to sort the model when the following cases:
1. setModel(org.zkoss.zul.ListModel<?>) is called and Listheader.setSortDirection(java.lang.String) is set.
2. Listheader.setSortDirection(java.lang.String) is called.
3. Model receives ListDataEvent and Listheader.setSortDirection(java.lang.String) is set.
If you want to ignore sort when receiving ListDataEvent, you can specifies the value as "ignore.change".
Notice that you could specify this attribute in any of its ancestor's attributes. It will be inherited.
org.zkoss.zul.listbox.groupSelect

Specifies whether Listgroups under this Listbox are selectable. Notice that you could specify this attribute in any of its ancestor's attributes. It will be inherited. Default value is false.

org.zkoss.zul.listbox.preloadSize
.(since 5.0.8)
Specifies the number of items to preload when receiving the rendering request from the client.
It is used only if live data (setModel(ListModel) and not paging (getPagingChild()).

org.zkoss.zul.listbox.initRodSize
.(since 5.0.8)
Specifies the number of items rendered when the Listbox first render.
It is used only if live data (setModel(ListModel) and not paging (getPagingChild()).

org.zkoss.zul.listbox.selectOnHighlight.disabled
.(since 7.0.4)
Sets whether to disable select functionality when highlighting text content with mouse dragging or not.
Author:

tomyeh

See Also:

ListModel, ListitemRenderer, ListitemRendererExt, Serialized Form

Nested Class Summary

Nested Classes
Modifier and Type Class Description

protected class Listbox.Children

protected class Listbox.ExtraCtrl
A utility class to implement HtmlBasedComponent.getExtraCtrl().
- Nested classes/interfaces inherited from class org.zkoss.zul.impl.MeshElement
  MeshElement.InternalPaging
- Nested classes/interfaces inherited from class org.zkoss.zk.ui.AbstractComponent
  org.zkoss.zk.ui.AbstractComponent.ForwardInfo, org.zkoss.zk.ui.AbstractComponent.TargetInfo

Field Summary

Fields
Modifier and Type Field Description

static java.lang.String LOADING_MODEL

static java.lang.String SYNCING_MODEL
- Fields inherited from class org.zkoss.zul.impl.MeshElement
  CSS_FLEX_AUTO_DISABLED_COUNT
- Fields inherited from class org.zkoss.zk.ui.HtmlBasedComponent
  _zclass
- Fields inherited from interface org.zkoss.zk.ui.Component
  APPLICATION_SCOPE, COMPONENT_SCOPE, DESKTOP_SCOPE, PAGE_SCOPE, REQUEST_SCOPE, SESSION_SCOPE, SPACE_SCOPE
- Fields inherited from interface org.zkoss.zk.ui.sys.ComponentCtrl
  AFTER_CHILD_ADDED, AFTER_CHILD_REMOVED, AFTER_CLONED, AFTER_PAGE_ATTACHED, AFTER_PAGE_DETACHED, AFTER_PARENT_CHANGED, CE_BUSY_IGNORE, CE_DUPLICATE_IGNORE, CE_IMPORTANT, CE_NON_DEFERRABLE, CE_REPEAT_IGNORE

Constructor Summary

Constructors
Constructor Description

Listbox()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`addItemToSelection(Listitem item)`	Selects the given item, without deselecting any other items that are already selected..
`protected void`	`afterInsert(org.zkoss.zk.ui.Component comp)`	Callback if a list item has been inserted.
`Listitem`	`appendItem(java.lang.String label, java.lang.String value)`	Appends an item.
`void`	`beforeChildAdded(org.zkoss.zk.ui.Component newChild, org.zkoss.zk.ui.Component refChild)`
`protected void`	`beforeRemove(org.zkoss.zk.ui.Component comp)`	Callback if a list item will be removed (not removed yet).
`void`	`clearSelection()`	Clears the selection.
`java.lang.Object`	`clone()`
`<T extends org.zkoss.zk.ui.Component> java.util.List<T>`	`getChildren()`
`java.lang.String`	`getEmptyMessage()`	Returns the message to display when there are no items
`java.lang.Object`	`getExtraCtrl()`
`Frozen`	`getFrozen()`	Returns the frozen child.
`int`	`getGroupCount()`	Returns the number of listgroup
`java.util.List<Listgroup>`	`getGroups()`	Returns a list of all `Listgroup`.
`<D,G,F> GroupsModel<D,G,F>`	`getGroupsModel()`	Returns the groups model associated with this list box, or null if this list box is associated with a `ListModel` or not associated with any list data model.
`java.util.Collection<org.zkoss.zk.ui.Component>`	`getHeads()`	Returns a collection of heads, including `getListhead()` and auxiliary heads (`Auxhead`) (never null).
`int`	`getIndexOfItem(Listitem item)`	Returns the index of the specified item, or -1 if not found.
`java.lang.String`	`getInnerWidth()`	Returns the inner width of this component.
`Listitem`	`getItemAtIndex(int index)`	Returns the item at the specified index.
`int`	`getItemCount()`	Returns the number of items.
`<T> ListitemRenderer<T>`	`getItemRenderer()`	Returns the renderer to render each item, or null if the default renderer is used.
`java.util.List<Listitem>`	`getItems()`	Returns a live list of all `Listitem`.
`Listfoot`	`getListfoot()`	Returns `Listfoot` belonging to this listbox, or null if no list footers at all.
`Listhead`	`getListhead()`	Returns `Listhead` belonging to this listbox, or null if no list headers at all.
`<T> ListModel<T>`	`getListModel()`	Returns the list model associated with this list box, or null if this list box is associated with a `GroupsModel` or not associated with any list data model.
`int`	`getMaxlength()`	Returns the maximal length of each item's label.
`<T> ListModel<T>`	`getModel()`	Returns the model associated with this list box, or null if this list box is not associated with any list data model.
`java.lang.String`	`getName()`	Returns the name of this component.
`java.lang.String`	`getNonselectableTags()`	Returns a list of HTML tag names that shall not cause the list item being selected if they are clicked.
`java.lang.String`	`getOddRowSclass()`	Returns the style class for the odd rows.
`Paginal`	`getPaginal()`	Returns the paging controller, or null if not available.
`Paging`	`getPagingChild()`	Returns the child paging controller that is created automatically, or null if mold is not "paging", or the controller is specified externally by `setPaginal(org.zkoss.zul.ext.Paginal)`.
`org.zkoss.zk.ui.sys.PropertyAccess`	`getPropertyAccess(java.lang.String prop)`
`int`	`getRows()`	Returns the rows.
`int`	`getSelectedCount()`	Returns the number of items being selected.
`int`	`getSelectedIndex()`	Returns the index of the selected item (-1 if no one is selected).
`Listitem`	`getSelectedItem()`	Returns the selected item.
`java.util.Set<Listitem>`	`getSelectedItems()`	Returns all selected items.
`java.lang.String`	`getSeltype()`	Returns the seltype.
`int`	`getVisibleItemCount()`	Returns the number of visible descendant `Listitem`.
`java.lang.String`	`getZclass()`
`boolean`	`hasGroup()`	Returns whether listgroup exists.
`boolean`	`insertBefore(org.zkoss.zk.ui.Component newChild, org.zkoss.zk.ui.Component refChild)`
`protected boolean`	`isAutohidePaging()`
`boolean`	`isCheckmark()`	Returns whether the check mark shall be displayed in front of each item.
`boolean`	`isDisabled()`	Returns whether it is disabled.
`boolean`	`isMultiple()`	Returns whether multiple selections are allowed.
`protected boolean`	`isSelectOnHighlightDisabled()`
`boolean`	`isVflex()`	Returns whether to grow and shrink vertical to fit their given space, so called vertical flexibility.
`void`	`onAfterRender()`
`void`	`onInitRender()`	Handles a private event, onInitRender.
`void`	`onPageAttached(org.zkoss.zk.ui.Page newpage, org.zkoss.zk.ui.Page oldpage)`
`void`	`onPageDetached(org.zkoss.zk.ui.Page page)`
`void`	`onPagingInitRender()`	Handles a private event, onPagingInitRender.
`protected Paginal`	`pgi()`	Returns the instance of the @{link Paginal}
`boolean`	`removeChild(org.zkoss.zk.ui.Component child)`	If the child is a listgroup, its listgroupfoot will be removed at the same time.
`Listitem`	`removeItemAt(int index)`	Removes the child item in the list box at the given index.
`void`	`removeItemFromSelection(Listitem item)`	Deselects the given item without deselecting other items.
`void`	`renderAll()`	Renders all `Listitem` if not loaded yet, with `getItemRenderer()`.
`Listitem`	`renderItem(Listitem li)`	Renders the specified `Listitem` if not loaded yet, with `getItemRenderer()`.
`void`	`renderItems(java.util.Set<? extends Listitem> items)`	Renders the given set of list items.
`protected void`	`renderProperties(org.zkoss.zk.ui.sys.ContentRenderer renderer)`
`void`	`scrollToIndex(int index)`	Scroll to the specified item by the given index.
`void`	`selectAll()`	Selects all items.
`void`	`selectItem(Listitem item)`	Deselects all of the currently selected items and selects the given item.
`void`	`service(org.zkoss.zk.au.AuRequest request, boolean everError)`	Processes an AU request.
`void`	`sessionDidActivate(org.zkoss.zk.ui.Page page)`
`void`	`sessionWillPassivate(org.zkoss.zk.ui.Page page)`
`void`	`setActivePage(int pg)`	Sets the active page (starting from 0).
`void`	`setActivePage(Listitem item)`	Sets the active page in which the specified item is.
`void`	`setCheckmark(boolean checkmark)`	Sets whether the check mark shall be displayed in front of each item.
`void`	`setDisabled(boolean disabled)`	Sets whether it is disabled.
`void`	`setEmptyMessage(java.lang.String emptyMessage)`	Sets the message to display when there are no items
`void`	`setHeight(java.lang.String height)`
`void`	`setInnerWidth(java.lang.String innerWidth)`	Sets the inner width of this component.
`void`	`setItemRenderer(java.lang.String clsnm)`	Sets the renderer by use of a class name.
`void`	`setItemRenderer(ListitemRenderer<?> renderer)`	Sets the renderer which is used to render each item if `getModel()` is not null.
`void`	`setMaxlength(int maxlength)`	Sets the maximal length of each item's label.
`void`	`setModel(GroupsModel<?,?,?> model)`	Sets the groups model associated with this list box.
`void`	`setModel(ListModel<?> model)`	Sets the list model associated with this listbox.
`void`	`setMold(java.lang.String mold)`	Sets the mold to render this component.
`void`	`setMultiple(boolean multiple)`	Sets whether multiple selections are allowed.
`void`	`setName(java.lang.String name)`	Sets the name of this component.
`void`	`setNonselectableTags(java.lang.String tags)`	Sets a list of HTML tag names that shall not cause the list item being selected if they are clicked.
`void`	`setOddRowSclass(java.lang.String scls)`	Sets the style class for the odd rows.
`void`	`setPageSize(int pgsz)`	Sets the page size, a.k.a., the number rows per page.
`void`	`setPaginal(Paginal pgi)`	Specifies the paging controller.
`void`	`setRows(int rows)`	Sets the rows.
`void`	`setSelectedIndex(int jsel)`	Deselects all of the currently selected items and selects the item with the given index.
`void`	`setSelectedItem(Listitem item)`	Deselects all of the currently selected items and selects the given item.
`void`	`setSelectedItems(java.util.Set<Listitem> listItems)`	Selects the given listitems.
`void`	`setSeltype(java.lang.String seltype)`	Sets the seltype.
`void`	`setVflex(boolean vflex)`	Sets whether to grow and shrink vertical to fit their given space, so called vertical flexibility.
`void`	`setVflex(java.lang.String flex)`
`void`	`shallUpdateScrollPos(boolean shallUpdateScrollPos)`	Sets whether to update the scroll position on init
`void`	`toggleItemSelection(Listitem item)`	If the specified item is selected, it is deselected.

Methods inherited from class org.zkoss.zul.impl.MeshElement
checkBeforeSetRows, evalCSSFlex, getActivePage, getPageCount, getPageSize, getPagingPosition, getSpan, isAutopaging, isPagingDisabled, isSizedByContent, isSpan, setAutopaging, setPagingDisabled, setPagingPosition, setSizedByContent, setSpan, setSpan

Methods inherited from class org.zkoss.zul.impl.XulElement
getContext, getCtrlKeys, getPopup, getTooltip, setContext, setContext, setContextAttributes, setCtrlKeys, setPopup, setPopup, setPopupAttributes, setTooltip, setTooltip, setTooltipAttributes

Methods inherited from class org.zkoss.zk.ui.HtmlBasedComponent
addSclass, focus, getAction, getClientAction, getDraggable, getDroppable, getHeight, getHflex, getLeft, getRenderdefer, getSclass, getStyle, getTabindex, getTabindexInteger, getTooltiptext, getTop, getVflex, getWidth, getZindex, getZIndex, removeSclass, removeSclass, setAction, setClass, setClientAction, setDraggable, setDroppable, setFocus, setHeight0, setHeightDirectly, setHflex, setHflex0, setHflexDirectly, setLeft, setLeftDirectly, setRenderdefer, setSclass, setStyle, setTabindex, setTabindex, setTooltiptext, setTop, setTopDirectly, setVflex0, setVflexDirectly, setWidth, setWidth0, setWidthDirectly, setZclass, setZindex, setZIndex, setZIndexDirectly

Methods inherited from class org.zkoss.zk.ui.AbstractComponent
addAnnotation, addCallback, addClientEvent, addEventHandler, addEventListener, addEventListener, addForward, addForward, addForward, addForward, addMoved, addRedrawCallback, addScopeListener, addShadowRoot, addShadowRootBefore, addSharedEventHandlerMap, appendChild, applyProperties, beforeChildRemoved, beforeParentChanged, destroyIndexCacheMap, detach, didActivate, didActivate, didDeserialize, didDeserialize, disableBindingAnnotation, disableClientUpdate, disableHostChanged, enableBindingAnnotation, enableHostChanged, getAnnotatedProperties, getAnnotatedPropertiesBy, getAnnotation, getAnnotations, getAnnotations, getAttribute, getAttribute, getAttribute, getAttributeOrFellow, getAttributes, getAttributes, getAuService, getAutag, getCallback, getClientAttribute, getClientDataAttribute, getClientEvents, getDefaultMold, getDefinition, getDesktop, getEventHandler, getEventHandlerNames, getEventListenerMap, getEventListeners, getFellow, getFellow, getFellowIfAny, getFellowIfAny, getFellows, getFirstChild, getForwards, getId, getIndexCacheMap, getLastChild, getMold, getNextSibling, getPage, getParent, getPreviousSibling, getRedrawCallback, getRoot, getShadowFellowIfAny, getShadowRoots, getShadowVariable, getShadowVariable, getShadowVariable0, getSpaceOwner, getSpecialRendererOutput, getStubonly, getSubBindingAnnotationCount, getTemplate, getTemplateNames, getUuid, getWidgetAttributeNames, getWidgetClass, getWidgetListener, getWidgetListenerNames, getWidgetOverride, getWidgetOverrideNames, hasAttribute, hasAttribute, hasAttribute, hasAttributeOrFellow, hasBindingAnnotation, hasFellow, hasFellow, hasSubBindingAnnotation, initIndexCacheMap, invalidate, isChildable, isDisabledHostChanged, isInitialized, isInvalidated, isListenerAvailable, isVisible, onChildAdded, onChildRemoved, onParentChanged, onWrongValue, query, queryAll, redraw, redrawChildren, removeAttribute, removeAttribute, removeAttribute, removeCallback, removeEventListener, removeForward, removeForward, removeRedrawCallback, removeScopeListener, removeShadowRoot, render, render, render, renderPropertiesOnly, replace, response, response, response, service, setAttribute, setAttribute, setAttribute, setAuService, setAutag, setClientAttribute, setClientDataAttribute, setDefinition, setDefinition, setId, setPage, setPageBefore, setParent, setStubonly, setStubonly, setSubBindingAnnotationCount, setTemplate, setVisible, setVisibleDirectly, setWidgetClass, setWidgetListener, setWidgetOverride, smartUpdate, smartUpdate, smartUpdate, smartUpdate, smartUpdate, smartUpdate, smartUpdate, smartUpdate, smartUpdate, smartUpdateWidgetListener, smartUpdateWidgetOverride, toString, updateByClient, updateSubBindingAnnotationCount, willPassivate, willPassivate, willSerialize, willSerialize

Methods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Field Detail
  - LOADING_MODEL
```
public static final java.lang.String LOADING_MODEL
```
    See Also:
    
    Constant Field Values
  - SYNCING_MODEL
```
public static final java.lang.String SYNCING_MODEL
```
    See Also:
    
    Constant Field Values
- Constructor Detail
  - Listbox
```
public Listbox()
```
- Method Detail
  - getChildren
```
public <T extends org.zkoss.zk.ui.Component> java.util.List<T> getChildren()
```
    Specified by:
    
    getChildren in interface org.zkoss.zk.ui.Component
    
    Overrides:
    
    getChildren in class org.zkoss.zk.ui.AbstractComponent
  - getListhead
```
public Listhead getListhead()
```
    Returns Listhead belonging to this listbox, or null if no list headers at all.
  - getListfoot
```
public Listfoot getListfoot()
```
    Returns Listfoot belonging to this listbox, or null if no list footers at all.
  - getFrozen
```
public Frozen getFrozen()
```
    Returns the frozen child.
    
    Since:
    
    5.0.0
  - getHeads
```
public java.util.Collection<org.zkoss.zk.ui.Component> getHeads()
```
    Returns a collection of heads, including getListhead() and auxiliary heads (Auxhead) (never null).
    
    Since:
    
    3.0.0
  - isCheckmark
```
public boolean isCheckmark()
```
    Returns whether the check mark shall be displayed in front of each item.
    Default: false.
  - setCheckmark
```
public void setCheckmark(boolean checkmark)
```
    Sets whether the check mark shall be displayed in front of each item.
    The check mark is a checkbox if isMultiple() returns true. It is a radio button if isMultiple() returns false.
  - setInnerWidth
```
public void setInnerWidth(java.lang.String innerWidth)
```
    Sets the inner width of this component. The inner width is the width of the inner table. By default, it is 100%. That is, it is the same as the width of this component. However, it is changed when the user is sizing the column's width.
    Application developers rarely call this method, unless they want to preserve the widths of sizable columns changed by the user. To preserve the widths, the developer have to store the widths of all columns and the inner width (getInnerWidth()), and then restore them when re-creating this component.
    
    Parameters:
    
    innerWidth - the inner width. If null, "100%" is assumed.
    
    Since:
    
    3.0.0
  - getInnerWidth
```
public java.lang.String getInnerWidth()
```
    Returns the inner width of this component. The inner width is the width of the inner table.
    Default: "100%"
    
    Since:
    
    3.0.0
    
    See Also:
    
    setInnerWidth(java.lang.String)
  - isVflex
```
public boolean isVflex()
```
    Returns whether to grow and shrink vertical to fit their given space, so called vertical flexibility.
    Note: this attribute is ignored if setRows(int) is specified
    Default: false.
  - setVflex
```
public void setVflex(boolean vflex)
```
    Sets whether to grow and shrink vertical to fit their given space, so called vertical flexibility.
    Note: this attribute is ignored if setRows(int) is specified
  - setVflex
```
public void setVflex(java.lang.String flex)
```
    Overrides:
    
    setVflex in class org.zkoss.zk.ui.HtmlBasedComponent
  - isDisabled
```
public boolean isDisabled()
```
    Returns whether it is disabled.
    Default: false.
  - setDisabled
```
public void setDisabled(boolean disabled)
```
    Sets whether it is disabled.
    Note that it is only applied when mold is "select".
  - getRows
```
public int getRows()
```
    Returns the rows. Zero means no limitation.
    Default: 0.
  - setRows
```
public void setRows(int rows)
             throws org.zkoss.zk.ui.WrongValueException
```
    Sets the rows.
    Note: Not allowed to set rows and height/vflex at the same time
    
    Throws:
    
    org.zkoss.zk.ui.WrongValueException
  - setHeight
```
public void setHeight(java.lang.String height)
```
    Overrides:
    
    setHeight in class org.zkoss.zk.ui.HtmlBasedComponent
  - getSeltype
```
public java.lang.String getSeltype()
```
    Returns the seltype.
    Default: "single".
  - setSeltype
```
public void setSeltype(java.lang.String seltype)
                throws org.zkoss.zk.ui.WrongValueException
```
    Sets the seltype. Allowed values:single,multiple
    
    Throws:
    
    org.zkoss.zk.ui.WrongValueException
  - isMultiple
```
public boolean isMultiple()
```
    Returns whether multiple selections are allowed.
    Default: false.
  - setMultiple
```
public void setMultiple(boolean multiple)
```
    Sets whether multiple selections are allowed.
    Notice that, if a model is assigned, it will change the model's state (by Selectable.setMultiple(boolean)).
  - getMaxlength
```
public int getMaxlength()
```
    Returns the maximal length of each item's label.
    It is meaningful only for the select mold.
  - setMaxlength
```
public void setMaxlength(int maxlength)
```
    Sets the maximal length of each item's label.
    It is meaningful only for the select mold.
  - getName
```
public java.lang.String getName()
```
    Returns the name of this component.
    Default: null.
    The name is used only to work with "legacy" Web application that handles user's request by servlets. It works only with HTTP/HTML-based browsers. It doesn't work with other kind of clients.
    Don't use this method if your application is purely based on ZK's event-driven model.
  - setName
```
public void setName(java.lang.String name)
```
    Sets the name of this component.
    The name is used only to work with "legacy" Web application that handles user's request by servlets. It works only with HTTP/HTML-based browsers. It doesn't work with other kind of clients.
    Don't use this method if your application is purely based on ZK's event-driven model.
    
    Parameters:
    
    name - the name of this component.
  - setNonselectableTags
```
public void setNonselectableTags(java.lang.String tags)
```
    Sets a list of HTML tag names that shall not cause the list item being selected if they are clicked.
    Default: null (it means button, input, textarea and a). If you want to select no matter which tag is clicked, please specify an empty string.
    
    Parameters:
    
    tags - a list of HTML tag names that will not cause the list item being selected if clicked. Specify null to use the default and "" to indicate none.
    
    Since:
    
    5.0.5
  - getNonselectableTags
```
public java.lang.String getNonselectableTags()
```
    Returns a list of HTML tag names that shall not cause the list item being selected if they are clicked.
    Refer to setNonselectableTags(java.lang.String) for details.
    
    Since:
    
    5.0.5
  - getItems
```
public java.util.List<Listitem> getItems()
```
    Returns a live list of all Listitem. By live we mean you can add or remove them directly with the List interface. In other words, you could add or remove an item by manipulating the returned list directly.
  - getItemCount
```
public int getItemCount()
```
    Returns the number of items.
  - getItemAtIndex
```
public Listitem getItemAtIndex(int index)
```
    Returns the item at the specified index.
    Note: if live data is used (getModel() is not null), the returned item might NOT be loaded yet. To ensure it is loaded, you have to invoke renderItem(org.zkoss.zul.Listitem).
  - getIndexOfItem
```
public int getIndexOfItem(Listitem item)
```
    Returns the index of the specified item, or -1 if not found.
  - getSelectedIndex
```
public int getSelectedIndex()
```
    Returns the index of the selected item (-1 if no one is selected).
  - setSelectedIndex
```
public void setSelectedIndex(int jsel)
```
    Deselects all of the currently selected items and selects the item with the given index.
  - selectItem
```
public void selectItem(Listitem item)
```
    Deselects all of the currently selected items and selects the given item.
    It is the same as setSelectedItem(org.zkoss.zul.Listitem).
    
    Parameters:
    
    item - the item to select. If null, all items are deselected.
  - addItemToSelection
```
public void addItemToSelection(Listitem item)
```
    Selects the given item, without deselecting any other items that are already selected..
    Notice that if you assign a model to a listbox (setModel(org.zkoss.zul.ListModel<?>)), you shall not invoke this method directly. Rather, use Selectable instead.
  - removeItemFromSelection
```
public void removeItemFromSelection(Listitem item)
```
    Deselects the given item without deselecting other items.
    Notice that if you assign a model to a listbox (setModel(org.zkoss.zul.ListModel<?>)), you shall not invoke this method directly. Rather, use Selectable instead.
  - toggleItemSelection
```
public void toggleItemSelection(Listitem item)
```
    If the specified item is selected, it is deselected. If it is not selected, it is selected. Other items in the list box that are selected are not affected, and retain their selected state.
  - clearSelection
```
public void clearSelection()
```
    Clears the selection.
  - selectAll
```
public void selectAll()
```
    Selects all items.
  - getSelectedItem
```
public Listitem getSelectedItem()
```
    Returns the selected item.
    Note: if live data is used (getModel() is not null), the returned item might NOT be loaded yet. To ensure it is loaded, you have to invoke renderItem(org.zkoss.zul.Listitem).
  - setSelectedItem
```
public void setSelectedItem(Listitem item)
```
    Deselects all of the currently selected items and selects the given item.
    It is the same as selectItem(org.zkoss.zul.Listitem).
  - setSelectedItems
```
public void setSelectedItems(java.util.Set<Listitem> listItems)
```
    Selects the given listitems.
    
    Since:
    
    3.6.0
  - getSelectedItems
```
public java.util.Set<Listitem> getSelectedItems()
```
    Returns all selected items.
    Note: if live data is used (getModel() is not null), the returned item might NOT be loaded yet. To ensure it is loaded, you have to invoke renderItem(org.zkoss.zul.Listitem).
  - getSelectedCount
```
public int getSelectedCount()
```
    Returns the number of items being selected.
  - appendItem
```
public Listitem appendItem(java.lang.String label,
                           java.lang.String value)
```
    Appends an item.
    Note: if live data is used (getModel() is not null), the returned item might NOT be loaded yet. To ensure it is loaded, you have to invoke renderItem(org.zkoss.zul.Listitem).
  - removeItemAt
```
public Listitem removeItemAt(int index)
```
    Removes the child item in the list box at the given index.
    Note: if live data is used (getModel() is not null), the returned item might NOT be loaded yet. To ensure it is loaded, you have to invoke renderItem(org.zkoss.zul.Listitem).
    
    Returns:
    
    the removed item.
  - getPaginal
```
public Paginal getPaginal()
```
    Returns the paging controller, or null if not available. Note: the paging controller is used only if AbstractComponent.getMold() is "paging".
    If mold is "paging", this method never returns null, because a child paging controller is created automatically (if not specified by developers with setPaginal(org.zkoss.zul.ext.Paginal)).
    If a paging controller is specified (either by setPaginal(org.zkoss.zul.ext.Paginal), or by setMold(java.lang.String) with "paging"), the listbox will rely on the paging controller to handle long-content instead of scrolling.
  - setPaginal
```
public void setPaginal(Paginal pgi)
```
    Specifies the paging controller. Note: the paging controller is used only if AbstractComponent.getMold() is "paging".
    It is OK, though without any effect, to specify a paging controller even if mold is not "paging".
    
    Parameters:
    
    pgi - the paging controller. If null and AbstractComponent.getMold() is "paging", a paging controller is created automatically as a child component (see getPagingChild()).
  - getPagingChild
```
public Paging getPagingChild()
```
    Returns the child paging controller that is created automatically, or null if mold is not "paging", or the controller is specified externally by setPaginal(org.zkoss.zul.ext.Paginal).
    
    Since:
    
    3.0.7
  - pgi
```
protected Paginal pgi()
```
    Description copied from class: MeshElement
    
    Returns the instance of the @{link Paginal}
    
    Specified by:
    
    pgi in class MeshElement
  - setActivePage
```
public void setActivePage(Listitem item)
```
    Sets the active page in which the specified item is. The active page will become the page that contains the specified item.
    
    Parameters:
    
    item - the item to show. If the item is null or doesn't belong to this listbox, nothing happens.
    
    Since:
    
    3.0.4
    
    See Also:
    
    setActivePage(int)
  - setActivePage
```
public void setActivePage(int pg)
                   throws org.zkoss.zk.ui.WrongValueException
```
    Description copied from class: MeshElement
    
    Sets the active page (starting from 0).
    
    Overrides:
    
    setActivePage in class MeshElement
    
    Throws:
    
    org.zkoss.zk.ui.WrongValueException
  - getVisibleItemCount
```
public int getVisibleItemCount()
```
    Returns the number of visible descendant Listitem.
    
    Since:
    
    3.5.1
  - getOddRowSclass
```
public java.lang.String getOddRowSclass()
```
    Returns the style class for the odd rows.
    Default: getZclass()-odd. (since 3.5.0)
    
    Since:
    
    3.0.0
  - setOddRowSclass
```
public void setOddRowSclass(java.lang.String scls)
```
    Sets the style class for the odd rows. If the style class doesn't exist, the striping effect disappears. You can provide different effects by providing the proper style classes.
    
    Since:
    
    3.0.0
  - getGroupCount
```
public int getGroupCount()
```
    Returns the number of listgroup
    
    Since:
    
    3.5.0
  - getGroups
```
public java.util.List<Listgroup> getGroups()
```
    Returns a list of all Listgroup.
    
    Since:
    
    3.5.0
  - hasGroup
```
public boolean hasGroup()
```
    Returns whether listgroup exists.
    
    Since:
    
    3.5.0
  - beforeChildAdded
```
public void beforeChildAdded(org.zkoss.zk.ui.Component newChild,
                             org.zkoss.zk.ui.Component refChild)
```
    Specified by:
    
    beforeChildAdded in interface org.zkoss.zk.ui.sys.ComponentCtrl
    
    Overrides:
    
    beforeChildAdded in class org.zkoss.zk.ui.AbstractComponent
  - insertBefore
```
public boolean insertBefore(org.zkoss.zk.ui.Component newChild,
                            org.zkoss.zk.ui.Component refChild)
```
    Specified by:
    
    insertBefore in interface org.zkoss.zk.ui.Component
    
    Overrides:
    
    insertBefore in class org.zkoss.zk.ui.AbstractComponent
  - removeChild
```
public boolean removeChild(org.zkoss.zk.ui.Component child)
```
    If the child is a listgroup, its listgroupfoot will be removed at the same time.
    
    Specified by:
    
    removeChild in interface org.zkoss.zk.ui.Component
    
    Overrides:
    
    removeChild in class org.zkoss.zk.ui.AbstractComponent
  - afterInsert
```
protected void afterInsert(org.zkoss.zk.ui.Component comp)
```
    Callback if a list item has been inserted.
    Note: it won't be called if other kind of child is inserted.
    When this method is called, the index is correct.
    Default: invalidate if it is the paging mold and it affects the view of the active page.
    
    Since:
    
    3.0.5
  - beforeRemove
```
protected void beforeRemove(org.zkoss.zk.ui.Component comp)
```
    Callback if a list item will be removed (not removed yet). Note: it won't be called if other kind of child is removed.
    Default: invalidate if it is the paging mold and it affects the view of the active page.
    
    Since:
    
    3.0.5
  - getModel
```
public <T> ListModel<T> getModel()
```
    Returns the model associated with this list box, or null if this list box is not associated with any list data model.
    Note: if setModel(GroupsModel) was called with a groups model, this method returns an instance of ListModel encapsulating it.
    
    See Also:
    
    setModel(ListModel), setModel(GroupsModel)
  - getListModel
```
public <T> ListModel<T> getListModel()
```
    Returns the list model associated with this list box, or null if this list box is associated with a GroupsModel or not associated with any list data model.
    
    Since:
    
    3.5.0
    
    See Also:
    
    setModel(ListModel)
  - getGroupsModel
```
public <D,G,F> GroupsModel<D,G,F> getGroupsModel()
```
    Returns the groups model associated with this list box, or null if this list box is associated with a ListModel or not associated with any list data model.
    
    Since:
    
    3.5.0
    
    See Also:
    
    setModel(GroupsModel)
  - setModel
```
public void setModel(ListModel<?> model)
```
    Sets the list model associated with this listbox. If a non-null model is assigned, no matter whether it is the same as the previous, it will always cause re-render.
    
    Parameters:
    
    model - the list model to associate, or null to dis-associate any previous model. If not null, it must implement Selectable.
    
    Throws:
    
    org.zkoss.zk.ui.UiException - if failed to initialize with the model
    
    See Also:
    
    getListModel(), setModel(GroupsModel)
  - setModel
```
public void setModel(GroupsModel<?,?,?> model)
```
    Sets the groups model associated with this list box. If a non-null model is assigned, no matter whether it is the same as the previous, it will always cause re-render.
    The groups model is used to represent a list of data with grouping.
    
    Parameters:
    
    model - the groups model to associate, or null to dis-associate any previous model.
    
    Throws:
    
    org.zkoss.zk.ui.UiException - if failed to initialize with the model
    
    Since:
    
    3.5.0
    
    See Also:
    
    setModel(ListModel), getGroupsModel()
  - getItemRenderer
```
public <T> ListitemRenderer<T> getItemRenderer()
```
    Returns the renderer to render each item, or null if the default renderer is used.
  - setItemRenderer
```
public void setItemRenderer(ListitemRenderer<?> renderer)
```
    Sets the renderer which is used to render each item if getModel() is not null.
    Note: changing a render will not cause the listbox to re-render. If you want it to re-render, you could assign the same model again (i.e., setModel(getModel())), or fire an ListDataEvent event.
    
    Parameters:
    
    renderer - the renderer, or null to use the default.
    
    Throws:
    
    org.zkoss.zk.ui.UiException - if failed to initialize with the model
  - setItemRenderer
```
public void setItemRenderer(java.lang.String clsnm)
                     throws java.lang.ClassNotFoundException,
                            java.lang.NoSuchMethodException,
                            java.lang.IllegalAccessException,
                            java.lang.InstantiationException,
                            java.lang.reflect.InvocationTargetException
```
    Sets the renderer by use of a class name. It creates an instance automatically.
    
    Throws:
    
    java.lang.ClassNotFoundException
    
    java.lang.NoSuchMethodException
    
    java.lang.IllegalAccessException
    
    java.lang.InstantiationException
    
    java.lang.reflect.InvocationTargetException
  - onInitRender
```
public void onInitRender()
```
    Handles a private event, onInitRender. It is used only for implementation, and you rarely need to invoke it explicitly.
  - onPagingInitRender
```
public void onPagingInitRender()
```
    Handles a private event, onPagingInitRender. It is used only for implementation, and you rarely need to invoke it explicitly.
  - renderItem
```
public Listitem renderItem(Listitem li)
```
    Renders the specified Listitem if not loaded yet, with getItemRenderer().
    It does nothing if getModel() returns null. In other words, it is meaningful only if live data model is used.
    
    Returns:
    
    the list item being passed to this method
    
    See Also:
    
    renderItems(java.util.Set<? extends org.zkoss.zul.Listitem>), renderAll()
  - renderAll
```
public void renderAll()
```
    Renders all Listitem if not loaded yet, with getItemRenderer().
    
    See Also:
    
    renderItem(org.zkoss.zul.Listitem), renderItems(java.util.Set<? extends org.zkoss.zul.Listitem>)
  - renderItems
```
public void renderItems(java.util.Set<? extends Listitem> items)
```
    Renders the given set of list items.
  - setMold
```
public void setMold(java.lang.String mold)
```
    Sets the mold to render this component.
    
    Specified by:
    
    setMold in interface org.zkoss.zk.ui.Component
    
    Overrides:
    
    setMold in class org.zkoss.zk.ui.AbstractComponent
    
    Parameters:
    
    mold - the mold. If null or empty, "default" is assumed. Allowed values: default, select, paging
    
    See Also:
    
    ComponentDefinition
  - getEmptyMessage
```
public java.lang.String getEmptyMessage()
```
    Returns the message to display when there are no items
    
    Returns:
    
    String
    
    Since:
    
    5.0.7
  - setEmptyMessage
```
public void setEmptyMessage(java.lang.String emptyMessage)
```
    Sets the message to display when there are no items
    
    Parameters:
    
    emptyMessage -
    
    Since:
    
    5.0.7
  - getZclass
```
public java.lang.String getZclass()
```
    Overrides:
    
    getZclass in class org.zkoss.zk.ui.HtmlBasedComponent
  - onPageAttached
```
public void onPageAttached(org.zkoss.zk.ui.Page newpage,
                           org.zkoss.zk.ui.Page oldpage)
```
    Specified by:
    
    onPageAttached in interface org.zkoss.zk.ui.sys.ComponentCtrl
    
    Overrides:
    
    onPageAttached in class org.zkoss.zk.ui.AbstractComponent
  - onPageDetached
```
public void onPageDetached(org.zkoss.zk.ui.Page page)
```
    Specified by:
    
    onPageDetached in interface org.zkoss.zk.ui.sys.ComponentCtrl
    
    Overrides:
    
    onPageDetached in class org.zkoss.zk.ui.AbstractComponent
  - clone
```
public java.lang.Object clone()
```
    Specified by:
    
    clone in interface org.zkoss.zk.ui.Component
    
    Overrides:
    
    clone in class XulElement
  - sessionWillPassivate
```
public void sessionWillPassivate(org.zkoss.zk.ui.Page page)
```
    Specified by:
    
    sessionWillPassivate in interface org.zkoss.zk.ui.sys.ComponentCtrl
    
    Overrides:
    
    sessionWillPassivate in class org.zkoss.zk.ui.AbstractComponent
  - sessionDidActivate
```
public void sessionDidActivate(org.zkoss.zk.ui.Page page)
```
    Specified by:
    
    sessionDidActivate in interface org.zkoss.zk.ui.sys.ComponentCtrl
    
    Overrides:
    
    sessionDidActivate in class org.zkoss.zk.ui.AbstractComponent
  - renderProperties
```
protected void renderProperties(org.zkoss.zk.ui.sys.ContentRenderer renderer)
                         throws java.io.IOException
```
    Overrides:
    
    renderProperties in class MeshElement
    
    Throws:
    
    java.io.IOException
  - isAutohidePaging
```
protected boolean isAutohidePaging()
```
    Specified by:
    
    isAutohidePaging in class MeshElement
  - isSelectOnHighlightDisabled
```
protected boolean isSelectOnHighlightDisabled()
```
  - getPropertyAccess
```
public org.zkoss.zk.ui.sys.PropertyAccess getPropertyAccess(java.lang.String prop)
```
    Specified by:
    
    getPropertyAccess in interface org.zkoss.zk.ui.sys.ComponentCtrl
    
    Overrides:
    
    getPropertyAccess in class XulElement
  - service
```
public void service(org.zkoss.zk.au.AuRequest request,
                    boolean everError)
```
    Processes an AU request.
    Default: in addition to what are handled by HtmlBasedComponent.service(org.zkoss.zk.au.AuRequest, boolean), it also handles onSelect.
    
    Specified by:
    
    service in interface org.zkoss.zk.ui.sys.ComponentCtrl
    
    Overrides:
    
    service in class org.zkoss.zk.ui.HtmlBasedComponent
    
    Since:
    
    5.0.0
  - getExtraCtrl
```
public java.lang.Object getExtraCtrl()
```
    Specified by:
    
    getExtraCtrl in interface org.zkoss.zk.ui.sys.ComponentCtrl
    
    Overrides:
    
    getExtraCtrl in class org.zkoss.zk.ui.HtmlBasedComponent
  - setPageSize
```
public void setPageSize(int pgsz)
                 throws org.zkoss.zk.ui.WrongValueException
```
    Description copied from class: MeshElement
    
    Sets the page size, a.k.a., the number rows per page.
    
    Overrides:
    
    setPageSize in class MeshElement
    
    Throws:
    
    org.zkoss.zk.ui.WrongValueException
  - onAfterRender
```
public void onAfterRender()
```
  - scrollToIndex
```
public void scrollToIndex(int index)
```
    Scroll to the specified item by the given index.
    
    Parameters:
    
    index - the index of item
    
    Since:
    
    8.5.2
  - shallUpdateScrollPos
```
public void shallUpdateScrollPos(boolean shallUpdateScrollPos)
```
    Sets whether to update the scroll position on init
    Default: false.
    Note: internal use only
    
    Parameters:
    
    shallUpdateScrollPos - whether update the scroll position on init
    
    Since:
    
    8.6.0

Modifier and Type	Class	Description
`protected class`	`Listbox.Children`
`protected class`	`Listbox.ExtraCtrl`	A utility class to implement `HtmlBasedComponent.getExtraCtrl()`.

Modifier and Type	Field	Description
`static java.lang.String`	`LOADING_MODEL`
`static java.lang.String`	`SYNCING_MODEL`

Class Listbox

Clustering and Serialization

Render on Demand (rod)

Custom Attributes

Nested Class Summary

Nested classes/interfaces inherited from class org.zkoss.zul.impl.MeshElement

Nested classes/interfaces inherited from class org.zkoss.zk.ui.AbstractComponent

Field Summary

Fields inherited from class org.zkoss.zul.impl.MeshElement

Fields inherited from class org.zkoss.zk.ui.HtmlBasedComponent

Fields inherited from interface org.zkoss.zk.ui.Component

Fields inherited from interface org.zkoss.zk.ui.sys.ComponentCtrl

Constructor Summary

Method Summary

Methods inherited from class org.zkoss.zul.impl.MeshElement

Methods inherited from class org.zkoss.zul.impl.XulElement

Methods inherited from class org.zkoss.zk.ui.HtmlBasedComponent

Methods inherited from class org.zkoss.zk.ui.AbstractComponent

Methods inherited from class java.lang.Object

Field Detail

LOADING_MODEL

SYNCING_MODEL

Constructor Detail

Listbox

Method Detail

getChildren

getListhead

getListfoot

getFrozen

getHeads

isCheckmark

setCheckmark

setInnerWidth

getInnerWidth

isVflex

setVflex

setVflex

isDisabled

setDisabled

getRows

setRows

setHeight

getSeltype

setSeltype

isMultiple

setMultiple

getMaxlength

setMaxlength

getName

setName

setNonselectableTags

getNonselectableTags

getItems

getItemCount

getItemAtIndex

getIndexOfItem

getSelectedIndex

setSelectedIndex

selectItem

addItemToSelection

removeItemFromSelection

toggleItemSelection

clearSelection

selectAll

getSelectedItem

setSelectedItem

setSelectedItems

getSelectedItems

getSelectedCount

appendItem

removeItemAt

getPaginal

setPaginal

getPagingChild

pgi

setActivePage

setActivePage

getVisibleItemCount

getOddRowSclass

setOddRowSclass