How to call an action method of a UICommand Component which was rendered conditionally?

action method is not called Please refer to this question - , One of my UICommand Component is rendered conditionally , it was said in the answer of the linked question - point 5 - that if the Component's or any of its parents rendered or disabled attributes are false - then the action method will not be called ? If thats the case- How do i achieve the same functionality? Is there a work around ? or a trick ? or any other approach开发者_开发技巧 ?

Thanks!

---

To the point, you'd like to retain the property responsible for the rendered condition in the subsequent request. There are several solutions for this problem:

1. Put bean in session scope. It's easy, but it hurts. It's bad for user experience since changes will be reflected in all tabs/windows the user has open in the same session.

2. Use <h:inputHidden> to transfer the property. In theory easy, but in practice it hurts as well. The value will namely get lost whenever a validation/conversion error has occurred in any of other inputs in the same form. This is an odditity in how JSF handles hidden input elements. A workaround is to use <h:inputHidden binding="#{bean.hidden}"> and do a hidden.getValue() and hidden.setValue() in bean.

3. If you're using <h:commandLink> instead of <h:commandButton>, then you can use <f:param> to transfer the property. It will be available as request parameter, you can check for it in bean's (post)constructor.

4. Use Tomahawk's <t:saveState>. The perfect solution as far. This will retain the value (or even a complete bean) in the subsequent request.

If you're already on JSF 2.0, the @ViewScoped would have solved this all. It behaves like the <t:saveState>.

See also:

• commandButton/commandLink/ajax action/listener method not invoked or input value not updated

---

The trick is to have 'rendered' evaluate to true when it is time to run the action and then change the condition to false in the action method.

Let's say you have a link rendering based on a boolean in your bean called 'editing'. Then your action would look something like this:

public String myAction() {
    // whatever you want your action to do

    editing = false;
}

Edit: this assumes that the bean is either session scoped or the boolean get propagated between requests.

---

In my case, Javascript came for rescue, Which means, whatever was to be displayed conditionally , put them in a HTML Portion and don't display them display: none until the desired event occurs.

HTML Portion can have any JSF Tags(including CommandButtons) as you wish and would work (invoking the action methods and the stuff )perfectly okay.