ZK页面如何调用后端方法？

Question

我想通过页面调用的onClick方法动态生成图片。但是无论我如何尝试，它都失败了。

我在后端的代码 class 是这样的：

public class RuleController  extends SelectorComposer<Component> {
     .......
   Image imageTemp = (Image)image.clone();
   ZScript script = new ZScript("java","delCondition1("+indexCon1+")");
   EventHandler evthdl = new EventHandler(script);
   imageTemp.addEventHandler("onClick", evthdl);
   ........

   public void delCondition1(int index){
      .........
   }
}

但是我点击页面上的图片后，出现了错误：

org.zkoss.zk.ui.UiException: Sourced file: inline evaluation of: ``delCondition1(0);'' : Command not found: delCondition1( int ) : at Line: 1 : in file: inline evaluation of: ``delCondition1(0);'' : delCondition1 ( 0 ) 

at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at org.zkoss.lang.Classes.newInstance(Classes.java:76)
at org.zkoss.lang.Exceptions.wrap(Exceptions.java:163)
at org.zkoss.zk.ui.UiException$Aide.wrap(UiException.java:51)
at org.zkoss.zk.scripting.bsh.BSHInterpreter.exec(BSHInterpreter.java:136)
at org.zkoss.zk.scripting.util.GenericInterpreter.interpret(GenericInterpreter.java:342)
at org.zkoss.zk.ui.impl.PageImpl.interpret(PageImpl.java:970)
at org.zkoss.zk.ui.AbstractComponent.service(AbstractComponent.java:3135)
at org.zkoss.zk.ui.AbstractComponent.service(AbstractComponent.java:3089)
at org.zkoss.zk.ui.impl.EventProcessor.process(EventProcessor.java:138)
at org.zkoss.zk.ui.impl.UiEngineImpl.processEvent(UiEngineImpl.java:1846)
at org.zkoss.zk.ui.impl.UiEngineImpl.process(UiEngineImpl.java:1618)
at org.zkoss.zk.ui.impl.UiEngineImpl.execUpdate(UiEngineImpl.java:1321)
at org.zkoss.zk.au.http.DHtmlUpdateServlet.process(DHtmlUpdateServlet.java:611)
at org.zkoss.zk.au.http.DHtmlUpdateServlet.doGet(DHtmlUpdateServlet.java:487)
at org.zkoss.zk.au.http.DHtmlUpdateServlet.doPost(DHtmlUpdateServlet.java:495)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:108)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:522)
at org.apache.catalina.valves.rewrite.RewriteValve.invoke(RewriteValve.java:479)
at org.apache.catalina.valves.rewrite.RewriteValve.invoke(RewriteValve.java:479)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:620)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:349)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:1110)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:785)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1425)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)

似乎 onClick 触发 java 代码找不到方法：delCondition1(int)，为什么？如何设置要调用的方法？

Answer 1

您不应在生产中使用 zscript，这仅适用于原型制作。参见 ZK 团队的 the statement。

如果您的图像是在 ZUL 文件中定义的，只需在您的方法上使用 @Listen("onClick = #yourImageId") 注释。

如果您的图片是动态生成的，请使用 EventListener 将 onClick 事件添加到您的图片中：

public class RuleController  extends SelectorComposer<Component> {

    ...

    Image imageTemp = (Image)image.clone();

    EventListener<Event> actionListener = new SerializableEventListener<Event>() {
        private static final long serialVersionUID = 1L;

        public void onEvent(Event event) throws Exception {
            delCondition1(indexCon1);
        }
    };

    imageTemp.addEventListener(Events.ON_CLICK, actionListener);

    ...

    public void delCondition1(int index){
        ...
    }
}

参见documentation。

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