Question

我尝试了几种方法来实现和编写带有action或actionListener的commandButon。我尝试实现ajax行为，设置动作并设置actionListener但没有成功。在我的pom中，我添加了 el-api 依赖，因为我的项目没有得到MethodExpression，MethodExpressionActionListener和ExpressionFactory类，并且在某些示例代码中它们是必需的。我没有在glassfish日志中获得任何错误消息，也没有js log。

修改如果我将bean范围更改为Session，则会调用action方法，但不会在此balus example上使用请求或视图

方法＆＃39; BeanUtils类

    public static MethodExpression createMethodExpression(String valueExpression,Class<?> expectedReturnType,Class<?>[] expectedParamTypes) {

    MethodExpression methodExpression = null;

    try {
        FacesContext fc = FacesContext.getCurrentInstance();
        ExpressionFactory factory = fc.getApplication().getExpressionFactory();

        methodExpression = factory.createMethodExpression(fc.getELContext(), valueExpression, expectedReturnType, expectedParamTypes);
    } catch (Exception e) {
        throw new FacesException("Method expression '" + valueExpression + "' could not be created.");
    }

    return methodExpression;
}

public static MethodExpressionActionListener createMethodActionListener(String valueExpression,Class<?> expectedReturnType,Class<?>[] expectedParamTypes) {

    MethodExpressionActionListener actionListener = null;

    try {
        actionListener = new MethodExpressionActionListener(createMethodExpression(
        valueExpression, expectedReturnType, expectedParamTypes));
    } catch (Exception e) {
        throw new FacesException("Method expression for ActionListener '" + valueExpression
        + "' could not be created.");
    }

    return actionListener;
}

按钮代码 （每次尝试都相同）

            CommandButton cancelBtn=(CommandButton)app.createComponent(CommandButton.COMPONENT_TYPE);
            cancelBtn.setId("deleteText_btn_" + panel.getId());
            cancelBtn.setAlt("Change");
            cancelBtn.setTitle("Change");
            cancelBtn.setValue("Change");

首先尝试 - Ajax行为

                MethodExpression me = BeanUtils.createMethodExpression("#{eventProvider.deleteText()}",null,new Class<?>[]{BehaviorEvent.class});
            AjaxBehavior ajaxBehavior = (AjaxBehavior) app.createBehavior(AjaxBehavior.BEHAVIOR_ID);
            ajaxBehavior.addAjaxBehaviorListener(new AjaxBehaviorListenerImpl(me, me));

            cancelBtn.addClientBehavior("submit",ajaxBehavior);

第二次尝试 - 设置actionListener

                FacesContext context = FacesContextWrapper.getCurrentInstance();
            MethodExpressionActionListener methodExpression = new MethodExpressionActionListener(context.getApplication().getExpressionFactory()
                    .createMethodExpression(context.getELContext(),"#{eventProvider.deleteText}", null, new Class[] {ActionEvent.class}));
            cancelBtn.addActionListener(methodExpression);

第三次尝试 - 设置操作

            FacesContext context = FacesContext.getCurrentInstance();
            MethodExpression methodExpression = context.getApplication().getExpressionFactory().createMethodExpression(
                context.getELContext(), "#{eventProvider.deleteText}", null, new Class[] { ActionEvent.class });
            cancelBtn.setActionExpression(methodExpression);

必须从action / actionListener

调用的方法

   @Component("eventProvider")
   @Scope("view")
   public class EventProvider {
    ............
    ............
    public void deleteText(ActionEvent event){
    logger.entry("EventProvider.deleteText()");

     System.out.print("debbuging");
    }
}

以编程方式设置Action / Actionlistener从不在JSF 2.2上调用

0 个答案: