I am using contrib:Table to display the results of a search. If a search
returns zero results, I want to treat this as an error and to show the
search form again with this error in the same way as if it was a faulty
user input validation.
It seems to me that a good solution to throw a PageRedirectException at
the moment when the Table component receives a source with 0 records in
it. I have tried to do this in the method that provides the model for
the page, like so:
public IBasicTableModel getModel() {
// some code to prepare the model
if (model.getRowCount() == 0) {
throw new PageRedirectException("Search");
}
return model;
}
But in this case the PageRedirectException was not caught by Tapestry
but propagated.
Another attempt was to override the renderComponent() method of the
Table component, like so:
protected void renderComponent(IMarkupWriter writer, IRequestCycle
cycle) {
if (getSource().getRowCount() == 0) {
throw new PageRedirectException("Search");
}
super.renderComponent(writer, cycle);
}
This seems to work when redirecting to a different page. However, I want
to redirect to the same page because the search form and the table of
results are simply two views of the same page, shown or hidden by If
components as needed. And when I am trying to redirect to the same page,
again, PageRedirectException is not caught but propagated, and the
application crashes.
Does anybody know, why PageRedirectException is sometimes caught but at
other times propagated and what to do about this? Or maybe you can see a
different solution for my problem?
Thanks,
Alex
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