Examples of org.itsnat.core.event.ItsNatEventListenerChain

org.itsnat.core.event.ItsNatEventListenerChain
This interface is used to control the flow of event listeners processing.
ItsNat provides a default implementation returned by {@link ItsNatEvent#getItsNatEventListenerChain()}.

Methods of this object must be called only inside the processing of an event listener and must not be saved beyond the lifetime of the related event.

Usually global event listeners and event listeners registered with {@link org.itsnat.comp.ItsNatComponent#addEventListener(String,org.w3c.dom.events.EventListener)}can benefit of this feature.
@author Jose Maria Arranz Santamaria

        EventListener global = new EventListenerSerial()
        {
            public void handleEvent(Event evt)
            {
                ItsNatEvent itsNatEvt = (ItsNatEvent)evt;
                ItsNatEventListenerChain chain = itsNatEvt.getItsNatEventListenerChain();
                try
                {
                    chain.continueChain();
                }
                catch(Exception ex)
                {
                    ex.printStackTrace();


                    itsNatDoc.addCodeToSend("var res = confirm('Unexpected Error! Reload?');");
                    itsNatDoc.addCodeToSend("if (res) window.location.reload(true);");
                    
                    itsNatDoc.setInvalid();
                    chain.stop();
                }
           }
        };
        itsNatDoc.addEventListener(global); // Comment this sentence to show errors in technical form

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                ItsNatDOMStdEvent itsNatEvt = ((ItsNatDOMStdEvent)evt);
                String num = (String)itsNatEvt.getExtraParam("num");
                if (num == null) return; // Any other
                log("Enter in global listener");
                ItsNatEventListenerChain chain = itsNatEvt.getItsNatEventListenerChain();
                try
                {
                    if (num.equals("1")||num.equals("2"))
                        chain.continueChain();
                    else
                        chain.stop(); // Avoids third listener
                }
                catch(Exception ex)
                {
                    log("Catched exception thrown by first listener");
                }

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        final ItsNatDocument itsNatDoc = null;
        EventListener global = new EventListener()
        {
            public void handleEvent(Event evt)
            {
                ItsNatEventListenerChain chain = ((ItsNatEvent)evt).getItsNatEventListenerChain();
                try
                {
                    chain.continueChain();
                }
                catch(Exception ex)
                {
                    itsNatDoc.addCodeToSend("alert('Unexpected Error! The page will reload.');");
                    itsNatDoc.addCodeToSend("window.location.reload(true);");


                    itsNatDoc.setInvalid();
                    chain.stop();
                }
           }
        };
        itsNatDoc.addEventListener(global);
    }

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        EventListener global = new EventListenerSerial()
        {
            public void handleEvent(Event evt)
            {
                ItsNatEvent itsNatEvt = ((ItsNatEvent)evt);
                ItsNatEventListenerChain chain = itsNatEvt.getItsNatEventListenerChain();
                try
                {
                    chain.continueChain();
                }
                catch(Exception ex)
                {
                    if (!ex.getMessage().equals("Must be catched"))
                        throw new RuntimeException("FAILED TEST");

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        EventListener list1 = new EventListenerSerial()
        {
            public void handleEvent(final Event evt)
            {
                ItsNatEventListenerChain chain = ((ItsNatEvent)evt).getItsNatEventListenerChain();
                try
                {
                    chain.continueChain();
                }
                catch(Exception ex)
                {
                    if (!ex.getMessage().equals("Must be catched"))
                        throw new RuntimeException("FAILED TEST");


                    TestEventListenerChainInComp.this.outText(" OK Chain 1-2");
                    chain.continueChain();
                }
            }
        };
        button.addEventListener("click",list1);

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org.itsnat.feashow.FeatureShowcaseDocument

test.comp.TestEventListenerChainInComp

test.core.TestEventListenerChain

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