Thanks for the help Dan. That's what I was afraid of. I don't actually
store the error anywhere, and the only indication is that there is a faces
message present in the context for the client id. I guess I'll just have to
store it somewhere.
It seems it would be a nice feature for input components to be able to
render invalid if a matching error exists. I'm guessing it wouldn't be a
difficult thing as the message component renders with what must be similar
logic (just guessing). Maybe I'll put together an RFE for this later.
On Jan 8, 2008 6:43 PM, Dan Labrecque <Dan.Labrecque_at_sun.com> wrote:
> Use the same value expression you would normally assign via your JSP page
> (e.g., "#{someBean.someMethod}").
>
>
> Steven Bell wrote:
>
> Getting the component and setting the ValueExpression looks like it will
> work just fine, I just don't know what to put in the 'expression' String.
>
> Basically what I would have is this I'm just not sure what would go in
> that second string. I'm guessing I'd have to indicate in some way what row
> this would apply to.
>
> UIComponent component = viewRoot.findComponent(uiField);
> if(component != null && component instanceof UIInput){
> setValueComponent(component, "valid", "?");
> }
> }
>
> On Jan 8, 2008 9:44 AM, Dan Labrecque <Dan.Labrecque_at_sun.com> wrote:
>
> > To set unique component values in a table, you must use a JSF value
> > expression. (Only one component is used, but value expressions allow you
> > to change each value per row.) Although "valid" is not a tag attribute,
> > you can still set a value expression for it providing you have a
> > component "binding". Once you have the component instance, you can use
> > the following code to create a value expression dynamically via Java
> > (i.e., your backing bean).
> >
> > import javax.el.ValueExpression;
> > import javax.faces.context.FacesContext;
> > import javax.faces.component.UIComponent;
> > ...
> >
> > /**
> > * Helper method to set value expression property.
> > *
> > * @param component The UIComponent to set a value expression for.
> > * @param name The name of the value expression property.
> > * @param expression The expresion for the value expression.
> > */
> > public static void setValueExpression(UIComponent component, String
> > name,
> > String expression) {
> > if (expression == null) {
> > return;
> > }
> > FacesContext context = FacesContext.getCurrentInstance();
> > component.setValueExpression(name, createValueExpression(
> > context, expression, Object.class));
> > }
> >
> > public static ValueExpression createValueExpression(
> > FacesContext context, String expr, Class value) {
> > return context.getApplication().getExpressionFactory().
> > createValueExpression(context.getELContext(), expr, value);
> > }
> >
> > That said, you might want to file a bug/RFE against textField to help
> > make this easier. Highlighting invalid textField values was a feature
> > recently added to Woodstock -- tables may have been overlooked?
> >
> > Dan
> >
> > Steven Bell wrote:
> > > Hi,
> > >
> > > I have a table used to enter line detail information. It's basically
> > > a table with several columns, each one has a textField. When the form
> >
> > > is submitted I need to display and validation errors. At one point in
> > > a backing bean I know that I have an error for a specific field on a
> > > specific row. I add a FacesMessage to the context and I can show the
> > > message in a messageGroup or message with the for attribute set
> > > easily, but I cannot figure out how to set the textFields valid
> > > property to false, so that it renders as in error (yellow background).
> >
> > >
> > > About the only think I could think to try was to get the component out
> > > of the FacesContext and set valid to false, but there is only one
> > > textField for the column at that point, and setting it's valid
> > > property seems to have no effect.
> > >
> > > Any ideas?
> > >
> > > --
> > > Regards,
> > >
> > > Steven Bell
> >
> > ---------------------------------------------------------------------
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> > For additional commands, e-mail: users-help_at_woodstock.dev.java.net
> >
> >
>
>
> --
> Regards,
>
> Steven Bell
>
>
>
--
Regards,
Steven Bell