Answers to: Start process of Ivycomponent in ManagedBean

Comment by docvominh on trungdv's answer

docvominh — Mon, 10 Jul 2017 03:19:36 -0400

hi @trungdv, i add some logic to check if "prepareFile" not done, uploadDocument will not be run :) but i meet some new issue, that i can not add FacesMessage to ivy Component. my code

FacesContext context = FacesContext.getCurrentInstance(); context.addMessage(null,new FacesMessage(FacesMessage.SEVERITY_ERROR, "MESSAGE CONTENT", "MESSAGE CONTENT"));

warning : There are some unhandled FacesMessages, this means not every FacesMessage had a chance to be rendered. These unhandled FacesMessages are: - MESSAGE CONTENT

I afraid that current context is belong to father dialog.

Thank you

Comment by docvominh on trungdv's answer

docvominh — Sat, 08 Jul 2017 09:28:28 -0400

hi @trungdv,

thank for your ideal, i will try it soon and reply to you.

Comment by trungdv on trungdv's answer

trungdv — Fri, 07 Jul 2017 06:33:32 -0400

hi @docvominh That's great when it works for your case.

What about exeption case? when something wrong happen in prepareFile, can we stop processing uploadDocument?

Answer by docvominh

docvominh — Fri, 07 Jul 2017 05:32:40 -0400

Hi @trungdv

Thanks for your comment.

I really like to do everything in ManagedBean. Fortunately, i found new way to achieve my goal.

use actionListener to call ManagedBean method, and action to call ivy method, when managedBean is done, ivy method start to call.

<p:commandButton actionListener="#{sPDocumentBean.prepareFile}" action="#{logic.uploadDocument}" value="Save"/>

Thank you :)

Answer by trungdv

trungdv — Thu, 06 Jul 2017 23:04:09 -0400

hi @docvominh

I have nearly the same case and i can call ivy method by this function:

public static Object evalELExpressionAsObject(String expression, FacesContext context)  {
        ExpressionFactory expressionFactory = context.getApplication().getExpressionFactory();
        ELContext elContext = context.getELContext();
        ValueExpression vex = expressionFactory.createValueExpression(elContext, expression, Object.class);
        Object result = (Object) vex.getValue(elContext);
        return result;
    }

Here is calling:

evalELExpressionAsObject("#{logic.doSomething()}", FacesContext.getCurrentInstance());

but in my experience, we only can call methods if they belong to Main Page (in your example) and can't call method of ComponentProcess component.

Because ivy have the mechanism to resolve keyword #data and #logic in correct context (see http://answers.axonivy.com/questions/2549/mechanism-to-resolve-data-and-logic-of-htmluserdialog)

So when you evaluate those twos manually, it will take the biggest context (the page).

P/S: once i can get the method of sub-component sucessfully but it lead to a lot of issue with security in ivy, so i suggest you should not do that (it look like a hack). You can introduce a managed bean for your component and you can call methods from there.

Cheers,