Package org.zkoss.zk.ui.event

Class OpenEvent

java.lang.Object

org.zkoss.zk.ui.event.Event

org.zkoss.zk.ui.event.OpenEvent

All Implemented Interfaces:

Serializable

public class OpenEvent
extends Event

Represents an event cause by user's opening or closing something at the client.

Note: it is a bit confusing but Events.ON_CLOSE is sent when user clicks a close button. It is a request to ask the server to close a window, a tab or others. If the server ignores the event, nothing will happen at the client. By default, the component is detached when receiving this event.

On the other hand, Events.ON_OPEN (with OpenEvent) is a notification. It is sent to notify the server that the client has opened or closed something. And, the server can not prevent the client from opening or closing.

Author:

tomyeh

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
OpenEvent(String name, Component target, boolean open)	Constructs an onOpen event.
OpenEvent(String name, Component target, boolean open, Component ref)	Constructs an onOpen event for a context menu, a tooltip or a popup.
OpenEvent(String name, Component target, boolean open, Component ref, Object value)	Constructs an onOpen event.

Method Summary

Modifier and Type	Method	Description
static final OpenEvent	getOpenEvent(AuRequest request)	Converts an AU request to an open event.
Component	getReference()	Returns the reference that causes Event.getTarget() to be opened.
Object	getValue()	Returns the value of the target component, when the onOpen event is sent, or null if not applicable.
boolean	isOpen()	Returns whether it causes open.

Methods inherited from class org.zkoss.zk.ui.event.Event

getData, getEvent, getName, getPage, getTarget, isPropagatable, stopPropagation, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Details

OpenEvent

public OpenEvent(String name,
 Component target,
 boolean open)

Constructs an onOpen event.

Parameters:

open - whether the new status is open

OpenEvent

public OpenEvent(String name,
 Component target,
 boolean open,
 Component ref)

Constructs an onOpen event for a context menu, a tooltip or a popup.

Parameters:

target - the component being opened

ref - the component that causes target to be opened.

OpenEvent

public OpenEvent(String name,
 Component target,
 boolean open,
 Component ref,
 Object value)

Constructs an onOpen event.

Parameters:

open - whether the new status is open

value - the current value of the target component if applicable.

Since:

3.5.0

See Also:

• getValue()

Method Details

getOpenEvent

public static final OpenEvent getOpenEvent(AuRequest request)

Converts an AU request to an open event.

Since:

5.0.0

getReference

public Component getReference()

Returns the reference that causes Event.getTarget() to be opened.

It is null, if the open event is not caused by opening a context menu, a tooltip or a popup. Note: the onOpen event is also sent when closing the context menu (tooltip and popup), and this method returns null in this case. Thus, it is better to test isOpen() or getReference() before accessing the returned value. if (event.isOpen()) doSome(event.getReference());

isOpen

public boolean isOpen()

Returns whether it causes open.

getValue

public Object getValue()

Returns the value of the target component, when the onOpen event is sent, or null if not applicable.

Note: combobox, bandbox and other combo-type input don't send the onChange event when the dropdown is opened (onOpen). Thus, if you want to do something depends on the value, use the value returned by this method. Furthermore, for combobox and bandbox, the return value is a non-null String instance.

Since:

3.5.0