java - JSF/RichFaces - 如何以编程方式从 HtmlAjaxSupport 调用 ActionEvent (a4j :support)

Question

我正在做这个

htmlAjaxSupport.setActionExpression(createMethodExpression(
                        "#{questionarioMB.visualizarQuestoesFilhos}", null,
                        new Class[0]));

方法

public void visualizarQuestoesFilhos()

被调用。

但是我想打电话

 public void visualizarQuestoesFilhos(ActionEvent event)

因为这样，我就可以获取正在点击哪个组件。

我需要在 htmlAjaxSupport 中设置什么才能工作？

Answer 1

在 JSF 1.2 或更高版本中创建 ActionListener 表达式:

FacesContext context = FacesContext.getCurrentInstance();
MethodExpression actionListener = context.getApplication().getExpressionFactory()
    .createMethodExpression(context.getELContext(), "#{bean.actionListener}", null, new Class[] {ActionEvent.class});
uiCommandComponent.addActionListener(new MethodExpressionActionListener(actionListener));

为了避免大量样板代码，您可以将其很好地包装在帮助程序方法中(如果需要，在帮助程序/实用程序类中)，例如:

public static MethodExpression createAction(String actionExpression, Class<?> returnType) {
    FacesContext context = FacesContext.getCurrentInstance();
    return context.getApplication().getExpressionFactory()
        .createMethodExpression(context.getELContext(), actionExpression, returnType, new Class[0]);
}

public static MethodExpressionActionListener createActionListener(String actionListenerExpression) {
    FacesContext context = FacesContext.getCurrentInstance();
    return new MethodExpressionActionListener(context.getApplication().getExpressionFactory()
        .createMethodExpression(context.getELContext(), actionListenerExpression, null, new Class[] {ActionEvent.class}));
}

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从 Adrian 提供的另一个 stackoverthread 获取代码片段:

Deprecated richfaces javax.faces.el.MethodBinding replacement use