问题
I need to limit what Dates
a user can pick from the com.google.gwt.user.datepicker.client.DateBox
.
I can't seem to figure out how to limit the min Date
so they can't pick past dates.
If I can't do this with com.google.gwt.user.datepicker.client.DateBox
is there an alternative DateBox
widget that will allow me this kind of flexibility?
回答1:
Based on the suggestions I received, here is what I came up with that works on limiting the selectable dates to only the current day and after. This works on GWT 2.1.1
final DateBox dateBox = new DateBox();
dateBox.addValueChangeHandler(new ValueChangeHandler<Date>()
{
@Override
public void onValueChange(final ValueChangeEvent<Date> dateValueChangeEvent)
{
if (dateValueChangeEvent.getValue().before(today()))
{
dateBox.setValue(today(), false);
}
}
});
dateBox.getDatePicker().addShowRangeHandler(new ShowRangeHandler<Date>()
{
@Override
public void onShowRange(final ShowRangeEvent<Date> dateShowRangeEvent)
{
final Date today = today();
Date d = zeroTime(dateShowRangeEvent.getStart());
while (d.before(today))
{
dateBox.getDatePicker().setTransientEnabledOnDates(false, d);
d = nextDay(d);
}
}
});
And for completeness here are the static
helper methods for manipulating the dates:
private static Date today()
{
return zeroTime(new Date());
}
/** this is important to get rid of the time portion, including ms */
private static Date zeroTime(final Date date)
{
return DateTimeFormat.getFormat("yyyyMMdd").parse(DateTimeFormat.getFormat("yyyyMMdd").format(date));
}
private static Date nextDay(final Date date)
{
return zeroTime(new Date(date.getTime() + 24 * 60 * 60 * 1000));
}
回答2:
I am guessing here but you may need to use the addValueChangeHandler. An example:
datebox.addValueChangeHandler(new ValueChangeHandler<Date>() {
public void onValueChange(ValueChangeEvent<Date> event) {
Date date = event.getValue();
if (date.before(new Date())) {
fromDatePicker.setValue(new Date());
}
}
});
Here when a user somehow selects a date that is in the past, it will auto set it to current date (or whatever fits your needs).
来源:https://stackoverflow.com/questions/5656495/how-to-limit-the-available-date-ranges-with-the-com-google-gwt-user-datepicker-c