How to create a action programatically

Question

Hi ,
Actually I am creating a button dynamically.This function is working fine.
But I am not able to add action to that button.
beacue samplebutton.setAction needs MethodBinding objetc and I am not able to create the same...
ANy idea how can i bind any action to the button programatically?

Answer 1

I am using below sample and it's working good.
RichCommandButton cb = new RichCommandButton();
String actionEL = "#{backingBeanName.actionFunctionName}";
MethodExpression action = actionMethodExpression(actionEL);
cb.setActionExpression(action);
public static MethodExpression actionMethodExpression(String actionName) {
//the MethodExpression to be returned.
MethodExpression methodExpression = null;
//Since Action Method does not accept parameters no argtypes are needed.
Class[] argumentTypes = new Class[0];
FacesContext facesCtx = FacesContext.getCurrentInstance();
Application app = facesCtx.getApplication();
ExpressionFactory elFactory = app.getExpressionFactory();
ELContext elContext = facesCtx.getELContext();
methodExpression =
elFactory.createMethodExpression(elContext, actionName, null,
argumentTypes);
try {
// this methodCall does some sort of "evaluation" of the newly created MethodExpression..
// if something is wrong... exception is thrown..
methodExpression.getMethodInfo(elContext);
} catch (Exception e) {
e.printStackTrace();
return methodExpression;
}