ClientEventHandler (The ZK Charts library 11.4.7.0 API)

All Known Implementing Classes:

PlotBand, PlotLine
```
public interface ClientEventHandler
```
A way to handle a client event listener.

Since:

1.2.0

Author:

jumperchen

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`addEventListener(String evtnm, org.zkoss.zk.ui.event.EventListener<? extends org.zkoss.zk.ui.event.Event> listener)`	Adds an event listener to this options.
`Iterable<org.zkoss.zk.ui.event.EventListener<? extends org.zkoss.zk.ui.event.Event>>`	`getEventListeners(String evtnm)`	Returns an iterative collection of the event listeners for the given event.
`Set<String>`	`getEventNames()`	Returns all event names, if any.
`boolean`	`removeEventListener(String evtnm, org.zkoss.zk.ui.event.EventListener<? extends org.zkoss.zk.ui.event.Event> listener)`	Removes an event listener.

- Method Detail
  - addEventListener
```
void addEventListener(String evtnm,
                      org.zkoss.zk.ui.event.EventListener<? extends org.zkoss.zk.ui.event.Event> listener)
```
    Adds an event listener to this options.
    
    Parameters:
    
    evtnm - what event to listen (never null), i.e. onClick, onMouseOver, and so on.
  - removeEventListener
```
boolean removeEventListener(String evtnm,
                            org.zkoss.zk.ui.event.EventListener<? extends org.zkoss.zk.ui.event.Event> listener)
```
    Removes an event listener.
    
    Returns:
    
    whether the listener is removed; false if it was never added.
  - getEventListeners
```
Iterable<org.zkoss.zk.ui.event.EventListener<? extends org.zkoss.zk.ui.event.Event>> getEventListeners(String evtnm)
```
    Returns an iterative collection of the event listeners for the given event.
    Note: it is OK to invoke addEventListener(java.lang.String, org.zkoss.zk.ui.event.EventListener<? extends org.zkoss.zk.ui.event.Event>) or removeEventListener(java.lang.String, org.zkoss.zk.ui.event.EventListener<? extends org.zkoss.zk.ui.event.Event>) when iterating through the event listeners with the returned collection.
    To remove an event listener from the returned iterative collection, you could invoke Iterable.iterator()'s Iterator.remove().
  - getEventNames
```
Set<String> getEventNames()
```
    Returns all event names, if any.