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
> <mailto: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
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe_at_woodstock.dev.java.net
> <mailto:users-unsubscribe_at_woodstock.dev.java.net>
> For additional commands, e-mail: users-help_at_woodstock.dev.java.net
> <mailto:users-help_at_woodstock.dev.java.net>
>
>
>
>
> --
> Regards,
>
> Steven Bell