h:message and rendered flag

[Carl Sziebert <ca...@vegas.com>]

Is there a convenient way to check an individual component for validity
or errors in the rendered flag of the h:message tag?  My backing bean
has getters/setters like so:
 
private User user = new User();
 
public User getUser() {
    return user;
}
 
public void setUser(User user) {
    this.user = user;
}
 
And my JSP accesses the field like so:
 
<h:inputText value="#{userActions.user.firstName}" id="firstName"
required="true" />
 
I've attempted the following with no success:
 
<h:message for="firstName" styleClass="errors" rendered="#{!
userActions.user.firstName.valid}" />
 
I get the feeling that I should be doing things differently or there is
something trivial I am missing.  Any and all help is appreciated.
 
Thanks.
 
Carl

RE: message and rendered flag

[Julian Ray <ju...@yahoo.com>]

Carl,
 
You should use a validator on the input component and validate the value
passed into the backing bean. The validator would throw an exception against
the component which, in turn would cause the page to be re-displayed and all
non-validating error messages shown. So..
 
create a validator method on your backing bean and change the code in your
JSP to
 
<h:inputText value="#{userActions.user.firstName}" id="firstName"
required="true" validator="{#userActions.validateFirstName}" />
<h:message for="firstName" styleClass="errors"  />
 
and in your backing bean create the validation logic eg.
 

public void validateFirstName(FacesContext fc, UIComponent uic, Object o) {

// Logic to determine if the input value validates. 

        if (o.toString().length() < 3 || o.toString().length() > 8) {
            invalidateInput((UIInput) uic, fieldName + " must be between 3
and 8 characters long.");
        }


}

 
If your validation logic is simple such as the one above you can use an
existing validator in the JSF package.




  _____  

From: Carl Sziebert [mailto:carl.sziebert@vegas.com] 
Sent: Monday, May 08, 2006 6:02 PM
To: MyFaces Discussion
Subject: h:message and rendered flag


Is there a convenient way to check an individual component for validity or
errors in the rendered flag of the h:message tag?  My backing bean has
getters/setters like so:
 
private User user = new User();
 
public User getUser() {
    return user;
}
 
public void setUser(User user) {
    this.user = user;
}
 
And my JSP accesses the field like so:
 
<h:inputText value="#{userActions.user.firstName}" id="firstName"
required="true" />
 
I've attempted the following with no success:
 
<h:message for="firstName" styleClass="errors" rendered="#{!
userActions.user.firstName.valid}" />
 
I get the feeling that I should be doing things differently or there is
something trivial I am missing.  Any and all help is appreciated.
 
Thanks.
 
Carl