AjaxAwareDiv.java

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package customtag;

import java.io.IOException;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import javax.faces.component.FacesComponent;
import javax.faces.component.UIComponentBase;
import javax.faces.component.behavior.ClientBehavior;
import javax.faces.component.behavior.ClientBehaviorContext;
import javax.faces.component.behavior.ClientBehaviorHolder;
import javax.faces.context.ExternalContext;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;

@FacesComponent(value = "ajaxawarediv")
public class AjaxAwareDiv extends UIComponentBase implements ClientBehaviorHolder {


    @Override
    public String getFamily() {
        return "custom";
    }

    @Override
    public void encodeEnd(FacesContext context) throws IOException {

        ClientBehaviorContext behaviorContext =
                ClientBehaviorContext.createClientBehaviorContext(context,
                this, "click", getClientId(context), null);

        ResponseWriter responseWriter = context.getResponseWriter();
        responseWriter.startElement("div", null);
        responseWriter.writeAttribute("id",getClientId(context),"id");
        responseWriter.writeAttribute("name", getClientId(context),"clientId");
        Map<String,List<ClientBehavior>> behaviors = getClientBehaviors();
        if (behaviors.containsKey("click") ) {
            String click = behaviors.get("click").get(0).getScript(behaviorContext);
            responseWriter.writeAttribute("onclick", click, null);
        }
        responseWriter.write("Hey! Click me! I'm a clickable div!");
        responseWriter.endElement("div");
    }


    @Override
    public void decode(FacesContext context) {
        Map<String, List<ClientBehavior>> behaviors = getClientBehaviors();
        if (behaviors.isEmpty()) {
            return;
        }

        ExternalContext external = context.getExternalContext();
        Map<String, String> params = external.getRequestParameterMap();
        String behaviorEvent = params.get("javax.faces.behavior.event");

        if (behaviorEvent != null) {
            List<ClientBehavior> behaviorsForEvent = behaviors.get(behaviorEvent);

            if (behaviors.size() > 0) {
                String behaviorSource = params.get("javax.faces.source");
               String clientId = getClientId(context);
               if (behaviorSource != null && behaviorSource.equals(clientId)) {
                   for (ClientBehavior behavior: behaviorsForEvent) {
                       behavior.decode(context, this);
                   }
               }
            }
        }
    }

    @Override
    public Collection<String> getEventNames() {
        return Arrays.asList("click");
    }

    @Override
    public String getDefaultEventName() {
        return "click";
    }
}