ZK Component Reference/Data/Listbox/Listhead

Listhead

• Demonstration: Listbox (Sorting)
• Java API: Listhead
• JavaScript API: Listhead
• Style Guide: Listhead

Employment/Purpose

A list headers used to define multi-columns and/or headers. Can only surpport Listheader as its child.

Example

 <window title="listbox demo" border="normal" width="250px">
         <listbox id="box">
             <listhead sizable="true">
                 <listheader label="name" sort="auto"/>
                 <listheader label="gender" sort="auto"/>
             </listhead>
             <listitem>
                 <listcell label="Mary"/>
                 <listcell label="FEMALE"/>
             </listitem>
             <listitem>
                 <listcell label="John"/>
                 <listcell label="MALE"/>
             </listitem>
             <listitem>
                 <listcell label="Jane"/>
                 <listcell label="FEMALE"/>
             </listitem>
             <listitem>
                 <listcell label="Henry"/>
                 <listcell label="MALE"/>
             </listitem>
             <listfoot >
                 <listfooter><label value="This is footer1"/></listfooter>
                 <listfooter><label value="This is footer2"/></listfooter>
             </listfoot>
         </listbox>        
 </window>

Properties

Menupopup

By default, the none is assumed, you can specify the auto to appear a default menu for the listhead. Or you can provide your own menupopup for the component.

[Since 6.5.0]

Auto

<zk>
	<listbox>
		<listhead menupopup="auto">
			<listheader label="Author" sort="auto"/>
			<listheader label="Title" sort="auto"/>
			<listheader label="Publisher" sort="auto"/>
			<listheader label="Hardcover" sort="auto"/>
		</listhead>
		// omitted...
	</listbox>
</zk>

listItems will be categorized by the label of its children (listcells). You could extend (ListitemComparator) and assign to the listheader (sorting properties) to change this default behavior.

Customized Menupopup

	<menupopup id="editPopup">
        <menuitem label="Group" image="~./zul/img/grid/menu-group.png"/>
        <menuitem label="Sort Ascending" image="~./zul/img/grid/menu-arrowup.png"/>
        <menuitem label="Sort Descending" image="~./zul/img/grid/menu-arrowdown.png"/>
	</menupopup>
	<listbox>
		<listhead menupopup="editPopup">
			<listheader label="Author" sort="auto"/>
			<listheader label="Title" sort="auto"/>
			<listheader label="Publisher" sort="auto"/>
			<listheader label="Hardcover" sort="auto"/>
		</listhead>
		// omitted...
	</listbox>

As you can see, the example above specifies a customized menu popup to the columns as its column menu.

Invisible Listhead for Alignment

Sometimes you want to use the listheader with a size or hflex value, but you don't want to show it up on the page, you can specify all the listheaders in the same listhead with an empty string.

For example,

<listbox width="200px">
	<listhead>
		<listheader hflex="1" />
		<listheader hflex="2" />
		<listheader hflex="1" />
	</listhead>
	<auxhead>
		<auxheader colspan="3">
			auxheader (listheaders hidden)
		</auxheader>
	</auxhead>
	<listitem>
		<listcell>hflex 1</listcell>
		<listcell>hflex 2</listcell>
		<listcell>hflex 1</listcell>
	</listitem>
	<listitem>
		<listcell>hflex 1</listcell>
		<listcell>hflex 2</listcell>
		<listcell>hflex 1</listcell>
	</listitem>
</listbox>

Supported Events

Name	Event Type
None	None

• Inherited Supported Events: HeadersElement

Supported Children

* Listheader 

Use Cases

Version	Description	Example Location
5.0	Multiline Listheader	http://www.zkoss.org/forum/listComment/6864

Version History

Version	Date	Content
6.5.0	June 2012	ZK-120: Provide menupopup="auto" for listbox