org.zkoss.zul
Class Button

java.lang.Object
  org.zkoss.zk.ui.AbstractComponent
      org.zkoss.zk.ui.HtmlBasedComponent
          org.zkoss.zul.impl.XulElement
              org.zkoss.zul.impl.LabelElement
                  org.zkoss.zul.impl.LabelImageElement
                      org.zkoss.zul.Button

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, Component, Disable, Scope, ComponentCtrl

Direct Known Subclasses:

Combobutton, Fileupload, MessageboxDlg.Button, Toolbarbutton

public class Button
extends LabelImageElement
implements Disable

A button.

Default getZclass(): z-button.(since 3.5.0)

Author:

tomyeh

See Also:

Serialized Form

Nested Class Summary

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

LabelImageElement.ExtraCtrl

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

AbstractComponent.Children

Field Summary

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

CE_BUSY_IGNORE, CE_DUPLICATE_IGNORE, CE_IMPORTANT, CE_NON_DEFERRABLE, CE_REPEAT_IGNORE

Constructor Summary

Button()

Button(java.lang.String label)

Button(java.lang.String label, java.lang.String image)

Method Summary

java.lang.Object	clone() Clones the component.
java.lang.String	getAutodisable() Returns a list of component IDs that shall be disabled when the user clicks this button.
java.lang.String	getDir() Returns the direction.
java.lang.String	getHref() Returns the href that the browser shall jump to, if an user clicks this button.
java.lang.String	getOrient() Returns the orient.
int	getTabindex() Returns the tab order of this component.
java.lang.String	getTarget() Returns the target frame or window.
java.lang.String	getType() Returns the button type.
java.lang.String	getUpload() Returns non-null if this button is used for file upload, or null otherwise.
java.lang.String	getZclass() Returns the ZK Cascading Style class(es) for this component.
protected boolean	isChildable() No child is allowed.
boolean	isDisabled() Returns whether it is disabled.
protected void	renderCrawlable(java.lang.String label) Renders the crawlable information.
protected void	renderProperties(ContentRenderer renderer) Renders the content of this component, excluding the enclosing tags and children.
void	setAutodisable(java.lang.String autodisable) Sets a list of component IDs that shall be disabled when the user clicks this button.
void	setDir(java.lang.String dir) Sets the direction to layout image.
void	setDisabled(boolean disabled) Sets whether it is disabled.
void	setHref(java.lang.String href) Sets the href.
void	setOrient(java.lang.String orient) Sets the orient to layout image.
void	setTabindex(int tabindex) Sets the tab order of this component.
void	setTarget(java.lang.String target) Sets the target frame or window.
void	setType(java.lang.String type) Sets the button type.
void	setUpload(java.lang.String upload) Sets the JavaScript class at the client to handle the upload if this button is used for file upload.
protected void	updateByClient(java.lang.String name, java.lang.Object value) Called when the widget running at the client asks the server to update a value.

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

getExtraCtrl, getHoverImage, getHoverImageContent, getIconSclass, getImage, getImageContent, getSrc, isImageAssigned, setHoverImage, setHoverImageContent, setHoverImageContent, setIconSclass, setImage, setImageContent, setImageContent, setSrc

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

getLabel, setLabel

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

getContext, getCtrlKeys, getPopup, getTooltip, setContext, setContext, setCtrlKeys, setPopup, setPopup, setTooltip, setTooltip

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

focus, getAction, getDraggable, getDroppable, getHeight, getHflex, getLeft, getRenderdefer, getSclass, getStyle, getTooltiptext, getTop, getVflex, getWidth, getZindex, getZIndex, service, setAction, setClass, setDraggable, setDroppable, setFocus, setHeight, setHeightDirectly, setHflex, setHflexDirectly, setLeft, setLeftDirectly, setRenderdefer, setSclass, setStyle, setTooltiptext, setTop, setTopDirectly, setVflex, setWidth, setWidthDirectly, setZclass, setZindex, setZIndex, setZIndexDirectly

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

addAnnotation, addAnnotation, addClientEvent, addEventHandler, addEventListener, addEventListener, addForward, addForward, addForward, addForward, addMoved, addScopeListener, addSharedEventHandlerMap, appendChild, applyProperties, beforeChildAdded, beforeChildRemoved, beforeParentChanged, detach, didActivate, didActivate, didDeserialize, didDeserialize, disableClientUpdate, equals, getAnnotatedProperties, getAnnotatedPropertiesBy, getAnnotation, getAnnotation, getAnnotations, getAnnotations, getAnnotations, getAttribute, getAttribute, getAttribute, getAttributeOrFellow, getAttributes, getAttributes, getAuService, getAutag, getChildren, getClientEvents, getDefaultMold, getDefinition, getDesktop, getEventHandler, getEventHandlerNames, getEventListenerMap, getEventListeners, getFellow, getFellow, getFellowIfAny, getFellowIfAny, getFellows, getFirstChild, getId, getLastChild, getListenerIterator, getMold, getNextSibling, getPage, getParent, getPreviousSibling, getRoot, getSpaceOwner, getStubonly, getTemplate, getTemplateNames, getUuid, getWidgetAttribute, getWidgetAttributeNames, getWidgetClass, getWidgetListener, getWidgetListenerNames, getWidgetOverride, getWidgetOverrideNames, hasAttribute, hasAttribute, hasAttribute, hasAttributeOrFellow, hasFellow, hasFellow, insertBefore, invalidate, isInvalidated, isListenerAvailable, isVisible, onChildAdded, onChildRemoved, onPageAttached, onPageDetached, onWrongValue, query, queryAll, redraw, redrawChildren, removeAttribute, removeAttribute, removeAttribute, removeChild, removeEventListener, removeForward, removeForward, removeScopeListener, render, render, render, replace, response, response, response, service, sessionDidActivate, sessionWillPassivate, setAttribute, setAttribute, setAttribute, setAuService, setAutag, setDefinition, setDefinition, setId, setMold, setPage, setPageBefore, setParent, setStubonly, setStubonly, setTemplate, setVisible, setVisibleDirectly, setWidgetAttribute, setWidgetClass, setWidgetListener, setWidgetOverride, smartUpdate, smartUpdate, smartUpdate, smartUpdate, smartUpdate, smartUpdate, smartUpdate, smartUpdate, smartUpdate, smartUpdateWidgetListener, smartUpdateWidgetOverride, toString, willPassivate, willPassivate, willSerialize, willSerialize

Methods inherited from class java.lang.Object

finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Button

public Button()

Button

public Button(java.lang.String label)

Button

public Button(java.lang.String label,
              java.lang.String image)

Method Detail

isDisabled

public boolean isDisabled()

Returns whether it is disabled.

Default: false.

Specified by:

isDisabled in interface Disable

setDisabled

public void setDisabled(boolean disabled)

Sets whether it is disabled.

Specified by:

setDisabled in interface Disable

See Also:

setAutodisable(java.lang.String)

getAutodisable

public java.lang.String getAutodisable()

Returns a list of component IDs that shall be disabled when the user clicks this button.

Since:

5.0.0

setAutodisable

public void setAutodisable(java.lang.String autodisable)

Sets a list of component IDs that shall be disabled when the user clicks this button.

To represent the button itself, the developer can specify self. For example, <button id="ok" autodisable="self,cancel"/> is the same as <button id="ok" autodisable="ok,cancel"/> that will disable both the ok and cancel buttons when an user clicks it.

The button being disabled will be enabled automatically once the client receives a response from the server. In other words, the server doesn't notice if a button is disabled with this method.

However, if you prefer to enable them later manually, you can prefix with '+'. For example, <button id="ok" autodisable="+self,+cancel"/>

Then, you have to enable them manually such as

if (something_happened){
  ok.setDisabled(false);
  cancel.setDisabled(false);

Default: null.

Since:

5.0.0

getDir

public java.lang.String getDir()

Returns the direction.

Default: "normal".

setDir

public void setDir(java.lang.String dir)
            throws WrongValueException

Sets the direction to layout image.

Parameters:

dir - either "normal" or "reverse".

Throws:

WrongValueException

getOrient

public java.lang.String getOrient()

Returns the orient.

Default: "horizontal".

setOrient

public void setOrient(java.lang.String orient)
               throws WrongValueException

Sets the orient to layout image.

Parameters:

orient - either "horizontal" or "vertical".

Throws:

WrongValueException

getType

public java.lang.String getType()

Returns the button type.

Default: "button".

Since:

5.0.4

setType

public void setType(java.lang.String type)
             throws WrongValueException

Sets the button type.

Default: "button". It is meaningful only if it is used with a HTML form. Refer to HTML Button Type for details.

Parameters:

type - either "button", "submit" or "reset".

Throws:

WrongValueException

Since:

5.0.4

getHref

public java.lang.String getHref()

Returns the href that the browser shall jump to, if an user clicks this button.

Default: null. If null, the button has no function unless you specify the onClick event listener.

If it is not null, the onClick event won't be sent.

setHref

public void setHref(java.lang.String href)

Sets the href.

getTarget

public java.lang.String getTarget()

Returns the target frame or window.

Note: it is useful only if href (setHref(java.lang.String)) is specified (i.e., use the onClick listener).

Default: null.

setTarget

public void setTarget(java.lang.String target)

Sets the target frame or window.

Parameters:

target - the name of the frame or window to hyperlink.

getTabindex

public int getTabindex()

Returns the tab order of this component.

Default: 0 (means the same as browser's default).

setTabindex

public void setTabindex(int tabindex)
                 throws WrongValueException

Sets the tab order of this component.

Throws:

WrongValueException

getUpload

public java.lang.String getUpload()

Returns non-null if this button is used for file upload, or null otherwise. Refer to setUpload(java.lang.String) for more details.

Since:

5.0.0

setUpload

public void setUpload(java.lang.String upload)

Sets the JavaScript class at the client to handle the upload if this button is used for file upload.

Default: null.

For example, the following example declares a button for file upload:

<button label="Upload" upload="true"
 onUpload="handle(event.media)"/>

As shown above, after the file is uploaded, an instance of UploadEvent is sent this component.

If you want to customize the handling of the file upload at the client, you can specify a JavaScript class when calling this method: <button upload="foo.Upload"/>

Another options for the upload can be specified as follows:

<button label="Upload" upload="true,maxsize=-1,multiple=true,accept=audio/*|video/*|image/*,native"

• maxsize: the maximal allowed upload size of the component, in kilobytes, or a negative value if no limit.
• native: treating the uploaded file(s) as binary, i.e., not to convert it to image, audio or text files.
• multiple: treating the file chooser allows multiple files to upload, the setting only works with HTML5 supported browsers (since ZK 6.0.0).
• accept: specifies the types of files that the server accepts, the setting only works with HTML5 supported browsers (since ZK 7.0.0).

Note: if the options of the false or the customized handler (like foo.Upload) are not specified, the option of true is implicit by default.

Parameters:

upload - a JavaScript class to handle the file upload at the client, or "true" if the default class is used, or null or "false" to disable the file download (and then this button behaves like a normal button).

Since:

5.0.0

renderProperties

protected void renderProperties(ContentRenderer renderer)
                         throws java.io.IOException

Description copied from class: HtmlBasedComponent

Renders the content of this component, excluding the enclosing tags and children.

See also ZK Client-side Reference: Property Rendering

Overrides:

renderProperties in class LabelImageElement

Throws:

java.io.IOException

renderCrawlable

protected void renderCrawlable(java.lang.String label)
                        throws java.io.IOException

Description copied from class: LabelElement

Renders the crawlable information. It is called by LabelElement.renderProperties(org.zkoss.zk.ui.sys.ContentRenderer), and designed to be overridden if the deriving class wants to generate it differently.

Default: org.zkoss.zul.impl.Utils.renderCrawlableText(label)

Overrides:

renderCrawlable in class LabelElement

Throws:

java.io.IOException

getZclass

public java.lang.String getZclass()

Description copied from class: HtmlBasedComponent

Returns the ZK Cascading Style class(es) for this component. It usually depends on the implementation of the mold (AbstractComponent.getMold()).

Default: null (the default value depends on element).

HtmlBasedComponent.setZclass(java.lang.String)) will completely replace the default style of a component. In other words, the default style of a component is associated with the default value of HtmlBasedComponent.getZclass(). Once it is changed, the default style won't be applied at all. If you want to perform small adjustments, use HtmlBasedComponent.setSclass(java.lang.String) instead.

Overrides:

getZclass in class HtmlBasedComponent

See Also:

HtmlBasedComponent.getSclass()

clone

public java.lang.Object clone()

Description copied from interface: Component

Clones the component. All of its children and descendants are cloned. Also, ID are preserved.

Specified by:

clone in interface Component

Overrides:

clone in class LabelImageElement

Returns:

the new component. Notice that it doesn't belong to any page, nor desktop. It doesn't have a parent, either.

isChildable

protected boolean isChildable()

No child is allowed.

Overrides:

isChildable in class AbstractComponent

updateByClient

protected void updateByClient(java.lang.String name,
                              java.lang.Object value)

Description copied from class: AbstractComponent

Called when the widget running at the client asks the server to update a value. The update is caused by an AU request named setAttr (by invoking zk.Widget's smartUpdate at client).

By default, it does nothing but log a warning message, since it is not safe to allow the client to update a field arbitrary.

However, if you'd like to allow the update for a particular component you could do one of the following

1. For component developers: override this method to update the field directly. For example,
   

   protected void updateByClient(String name, Object value) {
           if ("disabled".equals(name))
                   setDisabled(name, ((Boolean)value).booleanValue());
           else
                   super.updateByClient(name, value);

2. For application developers: set an attribute called org.zkoss.zk.ui.updateByClient to be true. Then, this method will use reflection to find out the setter to update the value. Nothing happens if the method is not found.

Notice: this method will invoke AbstractComponent.disableClientUpdate(boolean) to disable any update to the client, when calling the setter.

If you want to enable the client update for all instances of a given component (though not recommended for the security reason), you could refer to here.

See also zk.Widget.smartUpdate().

Overrides:

updateByClient in class AbstractComponent