Button"

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Revision as of 08:34, 17 November 2010

Button

Employment/Purpose

You could assign a label and an image to a button by the label and image properties. If both are specified, the dir property control which is displayed up front, and the orient property controls whether the layout is horizontal or vertical.

Within ZK 5, the file upload has been redesigned so it can be integrated with any widget. For example, The button can now be used to upload a file. In addition to this, the display of the upload status has been enhanced and can be customized easily.

Example

ZKComRef Button.jpg

	<button label="Left" image="/img/network.gif" width="125px"/>
	<button label="Right" image="/img/network.gif" dir="reverse" width="125px"/>
	<button label="Above" image="/img/network.gif" orient="vertical" width="125px"/>
	<button label="Below" image="/img/network.gif" orient="vertical" dir="reverse" width="125px"/>

File Upload

Any button[1] can be used to upload files. All you need to do is:

  1. Specify the upload attribute with true
  2. Handles the onUpload event.
<button upload="true" label="Fileupload" onUpload="myProcessUpload(event.getMedia())"/>

When the file is uploaded, an instance of UploadEvent is sent to the button. Then, the event listener can retrieve the uploaded content by examining the return value of UploadEvent.getMedia().


  1. Any Toolbarbutton can be used to upload files too.

Limitation of the Default Mold

The default mold of a button uses HTML BUTTON tag to represent it visually. It is efficient, but it has some limitations:

  1. The look might be different from one browser to another.
  2. It doesn't support the file upload. In fact, it will become the trendy mold automatically if upload is specified.

If it is an issue, you could use the trendy mold instead.

<button label="OK" mold="trendy"/>

Configure to Use the Trendy Mold as Default

If you prefer to use the trendy mold as default, you could configure ZK by adding the following to /WEB-INF/zk.xml

<library-property>
    <name>org.zkoss.zul.Button.mold</name>
    <value>trendy</value>
</library-property>

Supported Events

Name
Event Type
onFocus
Event: Event

Denotes when a component gets the focus.

onBlur
Event: Event

Denotes when a component loses the focus.

onUpload
Event: UploadEvent

Denotes user has uploaded a file to the component.

Supported Molds

Available molds of a component are defined in lang.xml embedded in zul.jar.

Name
Snapshot
default
Button mold default.png
trendy
Button mold trendy.png
os
Button mold os.png

Supported Children

*NONE

Use Cases

Version Description Example Location
3.6 Get dynamically generated Button reference in onClick Event http://www.zkoss.org/forum/listComment/8780
3.6 How to fire onClick Event on a Button http://www.zkoss.org/forum/listComment/1716

Version History

Last Update : 2010/11/17


Version Date Content
5.0.4 August 2010 Button.setType(String) was introduced to allow a button able to submit or reset a form.
<n:form action="a_uri" xmlns:n="native">
  <button type="submit" label="Submit"/>
  <button type="reset" label="Reset"/>
</n:form>



Last Update : 2010/11/17

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