Question

美好的一天，所以伙计们，我想要做的是以下内容，我在JSF页面中通过bean添加了一个HtmlSelectOneMenu，当它改变了他的值时喜欢它，HtmlSelectOneMenu他添加另一个，添加HtmlSelectOneMenu'我没有遇到任何问题，但是想知道如何通过BEAN课程ehehee

向他们添加一个事件

HtmlSelectOneMenu select = new HtmlSelectOneMenu();
        HtmlOutputLabel lblData = new HtmlOutputLabel();
        lblData.setValue(list.get(contador).getItem().getNome());
        UISelectItem item = new UISelectItem();
        item.setItemLabel("NÃO");
        item.setItemValue(false);
        UISelectItem item2 = new UISelectItem();
        item2.setItemLabel("SIM");
        item2.setItemValue(true);
        select.getChildren().add(item);
        select.getChildren().add(item2);
        FacesContext context = FacesContext.getCurrentInstance();
        ELContext elContext = context.getELContext();
        Application app = context.getApplication();
        ExpressionFactory expressionFactory = app.getExpressionFactory();
        ValueExpression ve = expressionFactory.createValueExpression(elContext, "#{projetoBean.qualRespondeu}", String.class);
        select.setValueExpression("valeu", ve);
        UIPanel container = (UIPanel) FacesContext.getCurrentInstance().getViewRoot().findComponent(":formProjeto:painel");
        container.getChildren().add(lblData);
        container.getChildren().add(select);
        contador++;

Answer 1

感谢Kolossus的回答，但决定如下：

   AjaxBehavior ajax = new AjaxBehavior();
ajax.setAsync(true);
ajax.setUpdate(":formProjeto");
MethodExpression ex = expressionFactory.createMethodExpression(elContext, "#{projetoBean.adicionaPergunta()}", null, new Class[]{});
ajax.addAjaxBehaviorListener(new AjaxBehaviorListenerImpl(ex, ex));
select.addClientBehavior("change", ajax);

Answer 2

请尝试以下步骤：

创建AjaxBehaviorListener（事件的实际处理）：

MyAjaxBehaviorListener implements AjaxBehaviorListener{

      @Override
      public void processAjaxBehavior(AjaxBehaviorEvent e) throws AbortProcessingException {
      //perform the event processing here

      }


}

将听众附加到AjaxBehavior

 AjaxBehavior ajaxBehavior = (AjaxBehavior) FacesContext.getCurrentInstance().getApplication() .createBehavior(AjaxBehavior.BEHAVIOR_ID);
 MyAjaxBehaviorListener listener = new MyAjaxBehaviorListener();
 ajaxBehavior.setExecute(Collections.singletonList("@this")); //sets the execute attribute of the event handler
 ajaxBehavior.addAjaxBehaviorListener(listener);

将AjaxBehavior附加到组件

item.addClientBehavior("change",ajaxBehavior); //set the triggering event to "change"

在bean jsf中创建的动态组件中添加事件

2 个答案: