I have a text field in a form, and I want to make sure that the user
enters a positive integer into it. I'm utterly befuddled about how to
accomplish this in a tidy way using Tapestry's new validation system.
Here's my component:
@Component(
type="TextField", id="bookQuantity",
bindings = { "value=ognl:bookQuantity",
"validators=validators:min=1" } )
public abstract TextField getBookQuantityComponent();
public abstract Integer getBookQuantity();
public abstract void setBookQuantity(Integer value);
If I type a value into this field, I get a ClassCastException at
Min.java:53:
Number value = (Number) object;
The object that's being passed in is a string. Clearly the "min"
validator expects a number to be passed in, but I don't see where my
string is going to be converted to a number.
The documentation is kind of broken on this front. The TextField docs
tell me:
"A TextField may be decorated by the Form's validation delegate,
but
does not have a validator, so is limited in editting properties
types
beyond string. In most cases, the ValidField component is
preferred."
And the ValidField docs tell me (under a big red "WARNING" heading):
"This component has been deprecated; Tapestry 4.0 adds even better
support for validation to TextField, TextArea and most other for
element component."
Lovely. The example on the page about validators shows an email
address, which is of course a string.
I'm sure that this made sense to someone at some point, but that
person is not me. Surely I'm missing something obvious...?
Cheers,
Paul
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