On Mon, Feb 16, 2009 at 2:48 PM, Simon Kitching <skitch...@apache.org<mailto:skitch...@apache.org>> wrote: Madhav Bhargava schrieb: > Hi All, > > > > I have a requirement wherein I have to disable UI components based on > whether there are any error messages in the Message Queue (t:messages). > > facesContext is an implicit object so I thought of using it like - > #{facesContext.getMessages.hasNext} However when it was not working > because you can only specify properties of a class and JSF variable and > property resolver will then internally try and call the getter/setter of > that property. > > > > I find that rather limiting because I do not find the need to define a > class level property when all I need is to process and output a Boolean. > Is there any way apart from overriding the > PropertyResolver/VariableResolver? >Simon wrote: >No, EL does not allow "method calls". It only allows reading/writing >properties. > >However isn't this enough for what you want to do? > >You could create a simple class: >public class MessageChecker { > public boolean isMessagePresent() { > return FacesContext.currentInstance().getMessages().hasNext(); > } > } > >Then register this class as an app-scope managed bean. > >JSF components can then do > disabled="#{messageChecker.messagePresent}" > >Yes this means creating a trivial class, and having an instance of it in >memory in order to call a static method from the JSF components. This >could be considered ugly. But on the other hand, the JSF pages are now >much better isolated from the details of the implementation. > >Regards, >Simon
Your solution will not work for messages which get added to the FacesContext during the validation phase. Method isMessagePresent() will not be called. That is the reason I was looking at accessing the messages as an EL expression. If there is a validation/conversion exception thrown then it will directly go to the render response phase after completing the validation phase. I will try and use a scriptlet to get access to messages and see if that is going to work. Not the best way of doing things but I will have to live with that as of now. Thanks for your response Simon. Regards, Madhav -- When I tell the truth, it is not for the sake of convincing those who do not know it, but for the sake of defending those that do **************** CAUTION - Disclaimer ***************** This e-mail contains PRIVILEGED AND CONFIDENTIAL INFORMATION intended solely for the use of the addressee(s). If you are not the intended recipient, please notify the sender by e-mail and delete the original message. Further, you are not to copy, disclose, or distribute this e-mail or its contents to any other person and any such actions are unlawful. This e-mail may contain viruses. Infosys has taken every reasonable precaution to minimize this risk, but is not liable for any damage you may sustain as a result of any virus in this e-mail. You should carry out your own virus checks before opening the e-mail or attachment. Infosys reserves the right to monitor and review the content of all messages sent to or from this e-mail address. Messages sent to or from this e-mail address may be stored on the Infosys e-mail system. ***INFOSYS******** End of Disclaimer ********INFOSYS***
