Chosenbox"

From Documentation
(ZK-5182: Remove the allowScripts property)
 
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==Lazy Rendering==
 
==Lazy Rendering==
  
With this usage, Chosenbox doesn't render any DOM elements in the drop-down list. When a user enters a character, it get a 'matched' content from the server-side and renders them in the drop-down list. This will cause some delay at the client side because of server processing time and network latency.
+
With <code>ListSubModel</code>, Chosenbox doesn't render any DOM elements in the drop-down list at first. Until a user enters a character, it retrieves 'matched' items from the server-side and renders them in the drop-down list. This might produce some delay at the client side because of server processing time and network latency.
  
 
See also: [http://books.zkoss.org/wiki/ZK_Component_Reference/Input/Combobox#Autocomplete_by_ListSubModel Combobox#Autocomplete_by_ListSubModel]
 
See also: [http://books.zkoss.org/wiki/ZK_Component_Reference/Input/Combobox#Autocomplete_by_ListSubModel Combobox#Autocomplete_by_ListSubModel]
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</source>
 
</source>
  
=Mouseless Entry Chosenbox=
 
  
* Press <tt>UP</tt> and <tt>DOWN</tt> to move the focus up and down by one option.
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{{CustomItemRendering |chosenbox}}
* Press <tt>LEFT</tt> and <tt>RIGHT</tt> to move focus between selected item(s) and the input field.
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* Press <tt>ESC</tt> to clear input and close drop-down list.
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=Keyboard Navigation Chosenbox=
* Press <tt>DELETE</tt> to delete the focused item and move focus to next item if any or input field.
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* Press <tt>BACKSPACE</tt> to delete the focused item and move focus to previous item if any or input field.
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* Press <code>UP</code> and <code>DOWN</code> to move the focus up and down by one option.
* Press <tt>ENTER</tt> or <tt>specified separator</tt> to select the focused option.
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* Press <code>LEFT</code> and <code>RIGHT</code> to move focus between selected item(s) and the input field.
 +
* Press <code>ESC</code> to clear input and close drop-down list.
 +
* Press <code>DELETE</code> to delete the focused item and move focus to next item if any or input field.
 +
* Press <code>BACKSPACE</code> to delete the focused item and move focus to previous item if any or input field.
 +
* Press <code>ENTER</code> or <code>specified separator</code> to select the focused option.
  
 
=Properties=
 
=Properties=
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<li>'''open''': specify whether or not to open the drop-down list. Default: '''false'''</li>
 
<li>'''open''': specify whether or not to open the drop-down list. Default: '''false'''</li>
 
<li>'''tabindex''': specify the tab order of the input node of this component.  Default: '''0'''</li>
 
<li>'''tabindex''': specify the tab order of the input node of this component.  Default: '''0'''</li>
<li>'''separator''': the separate characters will work as 'Enter' key when clicked on; it will not be considered as an input value. Upon releasing the key, it will an send onSearch or onSelect event depending on the situation. Supports: 0-9, A-Z (case insensitive), and <tt>,.;'[]/\-=</tt></li>
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<li>'''separator''': the separate characters will work as 'Enter' key when clicked on; it will not be considered as an input value. Upon releasing the key, it will an send onSearch or onSelect event depending on the situation. Supports: 0-9, A-Z (case insensitive), and <code>,.;'[]/\-=</code></li>
 
</ul>
 
</ul>
  
 
=Supported Events=
 
=Supported Events=
{| border="1" | width="100%"
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{| class='wikitable' | width="100%"
 
! <center>Name</center>
 
! <center>Name</center>
 
! <center>Event Type</center>
 
! <center>Event Type</center>
 
|-
 
|-
| <center><tt>onSelect</tt></center>
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| <center><code>onSelect</code></center>
 
| '''Event:''' <javadoc>org.zkoss.zk.ui.event.SelectEvent</javadoc>
 
| '''Event:''' <javadoc>org.zkoss.zk.ui.event.SelectEvent</javadoc>
  
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|-
 
|-
| <center><tt>onOpen</tt></center>
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| <center><code>onOpen</code></center>
 
| '''Event:''' <javadoc>org.zkoss.zk.ui.event.OpenEvent</javadoc>
 
| '''Event:''' <javadoc>org.zkoss.zk.ui.event.OpenEvent</javadoc>
  
 
Represents an event that indicates an open state that is changed at the client.
 
Represents an event that indicates an open state that is changed at the client.
 
|-
 
|-
| <center><tt>onSearch</tt></center>
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| <center><code>onSearch</code></center>
 
| '''Event:''' <javadoc>org.zkoss.zk.ui.event.InputEvent</javadoc>
 
| '''Event:''' <javadoc>org.zkoss.zk.ui.event.InputEvent</javadoc>
  
 
Represents an event that indicates users inputting an non-existing value by clicking ENTER or separator.
 
Represents an event that indicates users inputting an non-existing value by clicking ENTER or separator.
 
|-
 
|-
| <center><tt>onSearching</tt></center>
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| <center><code>onSearching</code></center>
 
| '''Event:''' <javadoc>org.zkoss.zk.ui.event.InputEvent</javadoc>
 
| '''Event:''' <javadoc>org.zkoss.zk.ui.event.InputEvent</javadoc>
  
 
Represents an event sent back to the server caused by user's input text.  
 
Represents an event sent back to the server caused by user's input text.  
 
|-
 
|-
| <center><tt>onItemClick</tt></center>
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| <center><code>onItemClick</code></center>
 
| '''Event:''' <javadoc>org.zkoss.zk.ui.event.Event</javadoc>
 
| '''Event:''' <javadoc>org.zkoss.zk.ui.event.Event</javadoc>
  
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=Use Cases=
 
=Use Cases=
{| border='1px' | width="100%"
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{| class='wikitable' | width="100%"
 
! Version !! Description !! Example Location
 
! Version !! Description !! Example Location
 
|-
 
|-
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=Version History=
 
=Version History=
 
{{LastUpdated}}
 
{{LastUpdated}}
{| border='1px' | width="100%"
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{| class='wikitable' | width="100%"
 
! Version !! Date !! Content
 
! Version !! Date !! Content
 
|-
 
|-
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| May 24, 2016
 
| May 24, 2016
 
| Add the new Event - onItemClick
 
| Add the new Event - onItemClick
 +
|
 
|}
 
|}
  
 
{{ZKComponentReferencePageFooter}}
 
{{ZKComponentReferencePageFooter}}

Latest revision as of 07:27, 23 February 2024

Chosenbox

Employment/Purpose

A component similar to Combobox but handles the multi-selection and the select order.

Example

Typical Usage

  • creatable attribute denotes whether or not to display createMessage when a user inputs a value that is non-existing in the model, and sends it back to the server along with an onSearch event when user clicks the ENTER key or separator.
  • emptyMessage will be displayed as a placeholder if nothing is selected or focused.
  • noResultText will be displayed if nothing matches the input value and it cannot be created either; syntax "{0}" will be replaced with the input value at client side.
  • createMessage will be displayed in popup if nothing matches the input value but can be created as new label; syntax "{0}" will be replaced with the input value at the client-side.

When no item is selected or focused, emptyMessage is visible.

CompREF Chosenbox msgEx 01.png

When there is no data to be shown in the model and data 0 already selected, noResultText appears.

CompREF Chosenbox msgEx 02.png

When there is no item in the model but it is creatable, createMessage appears.

CompREF Chosenbox msgEx 03.png

    <zscript>
        ListModelList model = new ListModelList(Locale.getAvailableLocales());
    </zscript>
    <chosenbox width="400px"
               model="${model}" creatable="true"
               emptyMessage=" Please select some items."
               noResultsText=" No such item - {0} - and it is already in the model."
               createMessage=" No such item -{0} - but it is not in model either, you can try to create it.">
        <attribute name="onSearch">
            Object obj = event.getValue();
            ((ListModelList)model).add(obj);
            self.addItemToSelection(obj);
        </attribute>
    </chosenbox>


Rendering All

Here, all the content will be sent to and processed at the client side. The rendering process is pretty fast with a few items but may cause performance issue when the model exceeds 40,000 items and rendering them all at once.

CompREF Chosenbox 01.png

    <zscript>
        ListModelList model = new ListModelList(Locale.getAvailableLocales());
    </zscript>
    <chosenbox width="400px" model="${model}"/>

Lazy Rendering

With ListSubModel, Chosenbox doesn't render any DOM elements in the drop-down list at first. Until a user enters a character, it retrieves 'matched' items from the server-side and renders them in the drop-down list. This might produce some delay at the client side because of server processing time and network latency.

See also: Combobox#Autocomplete_by_ListSubModel

    <zscript><![CDATA[
        ListModelList model = new ListModelList(Locale.getAvailableLocales());
        ListSubModel subModel = ListModels.toListSubModel(model);
    ]]></zscript>
    <chosenbox width="400px" model="${subModel}"/>


Custom Item Rendering

Since this component has no child component like Listbox, if you want to render its items differently, there 2 ways:

Change text

If you just want to change the text e.g. enclosing it with brackets, just put <template> as its child and add characters with ${each}:

   <chosenbox>
       <template name="model">[${each}]</template>
   </chosenbox>
  • The template only allows text that can be converted into a ZK Label.

Change HTML Structure

If you want to make more changes e.g. adding tooltips by setting title attributes, you need to create your own ItemRenderer. See ZK Developer's Reference/MVC/View/Renderer/Item Renderer.

Keyboard Navigation Chosenbox

  • Press UP and DOWN to move the focus up and down by one option.
  • Press LEFT and RIGHT to move focus between selected item(s) and the input field.
  • Press ESC to clear input and close drop-down list.
  • Press DELETE to delete the focused item and move focus to next item if any or input field.
  • Press BACKSPACE to delete the focused item and move focus to previous item if any or input field.
  • Press ENTER or specified separator to select the focused option.

Properties

  • creatable: specify whether to send an event to server when user inputs an non-existing value by clicking ENTER or separator. Default: false
  • createMessage: displayed in popup if nothing matches the input value and creatable is true; syntax "{0}" will be replaced with the input value at client side
  • disabled: specify whether or not it is disabled. Default: false
  • emptyMessage: displayed as place holder in input if nothing is selected or focused
  • model: specify the ListModel of this chosenbox
    • If you set ListModelList to the model of chosenbox, all the content will be sent to and processed at the client-side, The rendering process is pretty fast with a few items but may cause performance issue when the model exceeds 40,000 items and rendering them all at once
    • If you set ListSubModel to the chosenbox model, the content of the drop-down list will not be rendered to the client-side,and will remain blank until user enters an input. The server will then provide a 'matched' content for the input. This will cause some delay at the client side because of server processing time and network transfer time
  • name: specify the name of the input element of this component
  • noResultsText: displayed in popup window if nothing matches the input value and creatable is false; syntax "{0}" will be replaced with the input value at client-side
  • open: specify whether or not to open the drop-down list. Default: false
  • tabindex: specify the tab order of the input node of this component. Default: 0
  • separator: the separate characters will work as 'Enter' key when clicked on; it will not be considered as an input value. Upon releasing the key, it will an send onSearch or onSelect event depending on the situation. Supports: 0-9, A-Z (case insensitive), and ,.;'[]/\-=

Supported Events

Name
Event Type
onSelect
Event: SelectEvent

Represents an event caused by user's the selection changed at the client.

onOpen
Event: OpenEvent

Represents an event that indicates an open state that is changed at the client.

onSearch
Event: InputEvent

Represents an event that indicates users inputting an non-existing value by clicking ENTER or separator.

onSearching
Event: InputEvent

Represents an event sent back to the server caused by user's input text.

onItemClick
Event: Event

Represents an event sent back to the server caused by clicking a selected tag.

Supported Molds

  • The default mold

Supported Children

None

Use Cases

Version Description Example Location
6.0.1+ Creatable Chosenbox Chosenbox – A beautiful and powerful multiple combobox

Version History

Last Update : 2024/02/23


Version Date Content
6.0.1 April 3, 2012 Add the new Chosenbox component
8.0.2 May 24, 2016 Add the new Event - onItemClick



Last Update : 2024/02/23

Copyright © Potix Corporation. This article is licensed under GNU Free Documentation License.