Upgraded to Wicket 8 and boom, your classic datepicker doesn’t work anymore. If so, take a look here. I have good news for you. :) I cannot agree more that [Wicket] is a weirdo choice for building frontend and doesn’t happen to many poeple to have to work with it. Well there are exceptions though.
I upgraded the legacy Wicket code and I noticed that the Datepicker dependency is not compliance with the rest of Wicket 8 libraries. I started searching for something that is capable of both handling java 8 LocalDate and can be formatted easily. Unfortunately there weren’t that many options unti I bumped into awesome jQuery Kundo Datepicker. Formatting the code with java was not that straight forward and the model of implementation was totally different from the classic datepicker. Of course there is a document explaining how to use the Kundo DatePicker but for example the part about formatting was missing.
Jump to the code!
If you want to use and convert your chosen date to java 8 java.util.LocalDate, you should try to import from local.DatePicker package otherwise import com.googlecode.wicket.kendo.ui.form.datetime.DatePicker class to convert to java.util.Date. In quato “I hate those tutorials that don't share the imports. :|”
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import com.googlecode.wicket.kendo.ui.form.datetime.local.DatePicker;
import com.googlecode.wicket.kendo.ui.form.datetime.local.LocalTextField;
import com.googlecode.wicket.jquery.core.Options;
import org.apache.wicket.markup.html.form.Form;
public class MyPage {
Form form = new Form<Void>("form");
/* whatever implementation that goes in your page class */
final LocalTextField<LocalDate> fromDatePicker = new DatePicker("fromDateTextField",
new PropertyModel<>(dataProvider, "selectedFromDate"),
"yyyy-MM-dd",
new Options("dateFormat", Options.asString("yyyy-MM-dd")));
fromDatePicker.setRequired(true);
form.add(fromDatePicker);
}
You might have noticed that you need to imply your desired date format two times. Once as a parameter to the DatePicker constructor and another time as Options constructor parameter. And this is absolutely neccessary otherwise your format won’t work! Remember to add it to your html page:
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<form wicket:id="form">
<input type="text" wicket:id="fromDateTextField" />
</form>
Note with Kundo DatePicker you won’t need to create a separate textfield like old days but everything comes along with DatePicker class. Honestly I loved this feature of Kundo DatePicker.
What is going on under the hood!
LocalDate compatible of DatePicker class extends com.googlecode.wicket.kendo.ui.form.datetime.local.LocalTextField<java.time.LocalDate> which allows us easily use LocalDate. As you may see in the API class LocalTextField extends org.apache.wicket.markup.html.form.TextField<T>.
If you are planning to use classic util.Date, there are more options out there but Kundo let you directly use datetime package which is an older implementation and works just fine. :)