Re: How to deal with JPA Entities in a Wicket Model? (Data handling in models)
Am 03.05.2013 16:28, schrieb Bertrand Guay-Paquet: Best solution I can imagine would be if there would be a callback or overridable method which is called when the user navigates to a page and another one which is called when the user leaves a page. Those methods would be great to prepare and cleanup models. Are there such methods? No method will reliably inform you that a user left a page. His WIFI could die, the power could go out, etc. You must clear all expired temporary data after some time. If your data is stored in the session, that's done automatically for you. Thanks for your answer. I understand, that there can be situations when a user actually doesn't leave a page the usual way, but if there were a method as described, it could at least be helpful for all the preceding page-leave-events under normal conditions. At the moment I think I could handle the problem of unsaved data by using a Stateful Session Bean. Best Regards, Christian Mit freundlichen Grüßen, /// Kind Regards, Christian Reiter -- Christian Reiter||| c.rei...@gmx.net - To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org For additional commands, e-mail: users-h...@wicket.apache.org
How to deal with JPA Entities in a Wicket Model? (Data handling in models)
Hi! I'm wondering what's the recommended way to store a unpersisted object while it is edited (I'm using EJBs with JPA as backend). Let's imagine I want to build a customer editor which should be able to handle editing of new (unpersisted) and existing (persisted) customers. If I use a loadable detachable model to load the customer from the backed, all unpersisted changes between requests are lost - not really desirable. If I use a simple model which stores the entity in serialized form my sessions are growing and in addition I've to handle entity refreshing if a user navigates back to the page by using the browser's back button to prevent the user from saving an old entity state. Best solution I can imagine would be if there would be a callback or overridable method which is called when the user navigates to a page and another one which is called when the user leaves a page. Those methods would be great to prepare and cleanup models. Are there such methods? Is there any recommended way to store entities in wicket while they are edited? Kind Regards, Christian Reiter -- Christian Reiter||| c.rei...@gmx.net - To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org For additional commands, e-mail: users-h...@wicket.apache.org
wicket-contrib-javaee: @EJB injection - injecting always the same instance regardless of session
Hi! I've just started using the @EJB injection annotation from wicket-contrib-javaee. I use it to inject a Stateful Session Bean to keep track of my user session and do some stuff like authorization. I thought the @EJB annotation keeps track of my sessions and would inject a unique instance of the Stateful Session Bean for each of my Wicket session. But, it injects always the same Stateful Session Bean instance completely ignoring my Wicket sessions. In this case it is useless to keep track of my users. Am i doing anything wrong or is this the intended behaviour? Would it be better to get the Stateful Session Bean by a lookup call and then store it in the Wicket session? Thanks for your help! Best Regards, christian -- Christian Reiter|||c.rei...@gmx.net - To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org For additional commands, e-mail: users-h...@wicket.apache.org
AjaxFallbackButton doesn't update ajax components when validation fails?
Hi!
I've got a form in which I use some textfields and other components
which have validators attached.
The form also has the two standard ok and cancel buttons.
One important feature of the form is that the user should be able to
query the altitude of a geoposition.
Therefore the form has a latitude and longitude textfield and a query
altitude button.
When there is text in latitude and in longitude and the user clicks the
query altitude button a web service
is queried for the appropriate altitude. Then the form's model object is
updated with the altitude.
Everything works as expected when no other component in the form fails
validation. The altitude is sent
back to the client. But when any other component fails validation, the
altitude text field also isn't updated.
How can I omit this behaviour and get the altitude field updated,
regardless of the validation result of the
other components?
Here's my query-altitude-button code:
queryAltitudeButton = new AjaxFallbackButton(queryAltitudeButton, form) {
@Override
protected void onError(AjaxRequestTarget target, Form?
form) {
queryAlti(target);
}
@Override
protected void onSubmit(AjaxRequestTarget target, Form?
form) {
queryAlti(target);
}
private void queryAlti(AjaxRequestTarget target) {
Double alti =
AltitudeService.getAltitude(place.getLatitude(), place.getLongitude());
if( alti != null alti = -300.0 alti = 9000.0) {
place.setElevation(alti);
} else {
place.setElevation(null);
}
if( target != null ) {
target.addComponent(altitudeTextField);
target.addComponent(feedbackPanel);
}
}
};
queryAltitudeButton.setOutputMarkupId(true);
form.add(queryAltitudeButton);
Thanks!
chris
--
Christian Reiter|||c.rei...@gmx.net
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DropDownChoice: get selected object even if validation fails?
Hello! I've got a DropDownChoice in one of my forms, with which the user can select a icon. I want to display a preview of this icon beneath the drop down choice box. Therefore I added an AjaxFormValidatingBehavior to the DropDownChoice. Now, when the user changes the value of the DropDownChoice I get informed in the onError or onSubmit method of the AjaxFormValidatingBehavior. Everything works fine if the form validation is ok and the form data gets synced to my data model (then I query my model for the selected icon and update the corresponding Image and send it to the client). The problem occurs when the form validation doesn't work, because in this case, the form data isn't synced to the model and I have no chance to know which icon was selected by the user (through the DropDownChoice). As I want to display a preview of the icon also if any of the previous form components didn't validate successful, I am in need of a method which tells me which Icon was chosen by the user, regardless of the previous validation result. Is this possible? Thanks in anticipation! Best Regards, chris -- Christian Reiter|||c.rei...@gmx.net - To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org For additional commands, e-mail: users-h...@wicket.apache.org
Using Wicket together with Microsoft VirtualEarth/BingMaps
Hi! I am relatively new to Wicket but impressed by the comfort it offers. So far I used Perl/ModPerl/JavaScript for my web projects. I am usually using Java for my Desktop apps. For a application which should be created from scratch I am forced to use Microsofts Bing Maps (formerly known as VirtualEarth). Bing Maps is something similar to Google Maps. Basically there are only two tasks which have to performed with Bing. a) Placing placemarks/pushpins on the map b) Displaying those placemarks later (the placemarks act as links to some documents) I know that there is an extension for using Google Maps with Wicket, but I haven't found any for Bing Maps/VE. Is it basically possible to integrate Bing Maps with Wicket? I think task b) Displaying the placemarks can be done easily. But how about task a)? I am able to fire an JavaScript function when the user places a pusphin but how can I forward this event to Wicket? Any hints? Thanks in advance! Christian -- Christian Reiter|||c.rei...@gmx.net - To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org For additional commands, e-mail: users-h...@wicket.apache.org
