To follow up on my previous post, here's some code from a "showForm"
action that does exactly what I described...
public void prepare() {
if(session.get(SignUpFormBean.SESSION_KEY) == null) {
// they're here for the first time. do nothing (leave the
signUpFormBean model object null)
} else {
// they're returning because they've already failed a submission
log.debug("retrieving SignUpFormBean from session");
signUpFormBean = (SignUpFormBean)
session.get(SignUpFormBean.SESSION_KEY);
session.remove(SignUpFormBean.SESSION_KEY);
// errors from previous failure have been retrieved via the
MessageStore interceptor
}
}
public SignUpFormBean getModel() {
return signUpFormBean;
}
// Struts execute method
// NOTE: the error messages from the validation failure are available
to this action (and the view) via the StoreMessages interceptor
public String execute() throws Exception {
// we always provide region and country lists to the view
allPostalAddressRegions =
postalAddressRegionDao.getAllPostalAddressRegions();
allPostalAddressCountries =
postalAddressCountryDao.getAllPostalAddressCountries();
return Action.SUCCESS;
}
----
One of the fields for the form view (freemarker in my case) looks
something like this...
<!-- first and last name -->
<tr>
<td><label for="postalAddress.firstName"
class="karta-required-form-field">First Name</label></td>
<td><input type="text" id="postalAddress.firstName"
name="postalAddress.firstName" value="${(postalAddress.firstName) !}"
size="30" maxlength="64"/></td>
<td>${(fieldErrors["postalAddress.firstName"]) !}</td>
</tr>
----
The idea being that the view will show data in the SignUpFormBean if
that object contains it. If that object is null Freemarker shows
nothing. Works great, you can use the exact same form code regardless
of whether SignUpFormBean (in your case NewCar) has data or not.
You may need to play with how your own view layer (JSP? Velocity?)
handles the display of data for objects (or fields) that are null (and
they will be if this is the 1st time the user visits the form, they'll
only have data if the form is getting shown after a validation problem).
Freemarker is a bit touchy about null objects and properties so you have
to some special notation which you see above. I think velocity is more
forgiving. Not sure about JSP (I'm still actively trying to avoid it,
mostly succeeding).
Hopefully that gets you going in the right direction.
- Gary
Jeremy JGR. Grumbach wrote:
Hi,
Let's take the following scenario: we have a database which manage car
models (for example Dogde Viper). The column "name" of the "car model"
table must be unique.
The user wants to add a "car model" in the database, thus he has an "add
screen" containing all the fields of the "car model" and a "Save"
button. However he has entered a model which already exists in the
database. I check that in my business layer and return a runtime
exception "name already exists".
I can display it using global-exceptions, however it is forwarded to
another page and consequently, the user must reenter all the field
values one more time.
To avoid that, I want to go back to the "add screen" without losing user
inputs but with a red message "name already exists in the database" -
exactly like the struts validation error messages.
Do you think it is possible with Struts 2? I have used that lots of time
in Struts 1.
Thanks in advance,
Jeremy
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