以編程方式在Primefaces中創建命令按鈕

Question

我正嘗試使用輸入文本和命令按鈕創建動態窗體。一切正常。但是當我點擊命令按鈕時，動作監聽器從不被調用。請建議我做錯了什麼，或者這是PF還是Mojarra的錯誤。代碼如下

panel = new Panel(); 
panel.setHeader("Test"); 

InputText text = new InputText(); 

final String binding = "#{roleCreateForm.role.name}"; 

text.setValueExpression("value", 
      createValueExpression(binding, String.class)); 

panel.getChildren().add(text); 

CommandButton button = new CommandButton(); 
button.setValue("Save"); 

MethodExpression me = createMethodExpression("#{roleCreateForm.save}"); 

button.addActionListener(new MethodExpressionActionListener(me)); 

panel.getChildren().add(button); 

另外，createXXXExpression低於

private MethodExpression createMethodExpression(String action) { 
    final Class<?>[] paramTypes = new Class<?>[0]; 

    MethodExpression methodExpression = getExpressionFactory() 
    .createMethodExpression(getELContext(),action, null, paramTypes); 

    return methodExpression; 
} 

private ValueExpression createValueExpression(String binding, 
    Class<String> clazz) { 
    final ValueExpression ve = getExpressionFactory() 
     .createValueExpression(getELContext(), binding, String.class); 
    return ve; 
} 


public static ELContext getELContext() { 
    return FacesContext.getCurrentInstance().getELContext(); 
} 

public static ExpressionFactory getExpressionFactory() { 
    return getApplication().getExpressionFactory(); 
} 

public static Application getApplication() { 
    return FacesContext.getCurrentInstance().getApplication(); 
} 

我的form bean低於

public void save() { 
    logger.info("Saving role - {}" , role); 
} 

我使用 Primefaces 3.2，鑽嘴魚科2.1.7，Tomcat的7， JDK 6，Ubuntu 11

這是我修改後的代碼 是的，我看到你已經指出這是常見的錯誤。但這裏是我修改後的代碼。這也不起作用。

public Panel getPanel() { 
    if (panel == null) { 
    panel = new Panel(); 
    panel.setHeader("Test"); 
    panel.setId("dynapanel"); 

    InputText text = new InputText(); 
    text.setId("dynatext"); 

    final String binding = "#{roleCreateForm.role.name}"; 

    text.setValueExpression("value", createValueExpression(binding, String.class)); 

    panel.getChildren().add(text); 

    CommandButton button = new CommandButton(); 
    button.setValue("Save"); 

    MethodExpression me = getExpressionFactory().createMethodExpression(getELContext(), "#{roleCreateForm.save}", void.class, new Class[0]); 
    AjaxBehavior ajaxBehavior = new AjaxBehavior(); 
    //ajaxBehavior.setListener(me); 
    ajaxBehavior.addAjaxBehaviorListener(new AjaxBehaviorListenerImpl(me)); 
    button.addClientBehavior("submit", ajaxBehavior); 


    panel.getChildren().add(button); 

    } 
    return panel; 
}    

Answer 1

至於我記得，如果你要調用一個方法在支撐bean，使用MethodExpression的爲您AjaxBehaviour的監聽器：

 AjaxBehavior ab1 = new AjaxBehavior(); 
     ExpressionFactory ef = ctx.getApplication().getExpressionFactory(); 
     MethodExpression me1 = ef.createMethodExpression(ctx.getELContext(), 
            expression,//Your ELExpression #{roleCreateForm.save} 
            expectedReturnType, //In your case null 
            expectedParamTypes); //If you receive parameters put new Class[]{Object.class}); 
     ab1.setListener(me1); 
     button.addClientBehavior("submit", ab1); 

Answer 2

CommandButton btn = ((CommandButton) FacesContext.getCurrentInstance().getViewRoot().findComponent("full id of button")); 

try{ 
    FacesContext context = FacesContextWrapper.getCurrentInstance(); 
    MethodExpressionActionListener methodExpression = new MethodExpressionActionListener(context.getApplication().getExpressionFactory() 
       .createMethodExpression(context.getELContext(),"#{bean.method}", null, new Class[] {ActionEvent.class})); 

    btn.addActionListener(methodExpression); 
}catch(Exception exc){ 
    exc.printStackTrace(); 
} 

和createMethodExpression：

public static MethodExpression createMethodExpression(String expression, Class<?> returnType, Class<?>... parameterTypes) { 
    FacesContext facesContext = FacesContext.getCurrentInstance(); 
    return facesContext.getApplication().getExpressionFactory().createMethodExpression(
     facesContext.getELContext(), expression, returnType, parameterTypes); 
} 

這適用於我;）