I think
that working with combos is the most complex thing that you can do with NRapid,
they are hard to configure and requires a lot of plumbing code, but they are
really handy when you have to work with fixed sets of options.
This time
I’m going to build a report that shows some employees info. The report’s dialog
will allows us to filter that info based on the employees city and get smaller
result sets. Cities are a fixed set of data(at least in Northwind) so combos will be a
nice choice.
In order to
get a combo, we need to add to properties to the nested dialog. Those
properties will work together to make selection works.
The code
may look something like this:
Notice that
City is annotated with the ViewIgnore attribute, this is the way to tell to engine "do not create a control for this property". And Cities is annotated with the
DispalyOptionsFor attribute pointing to City, this means that the selected option
in the combo will be used to set the value of the City property.
Now that we
have those properties hooked up, we need to populate the list with the fixed set
of options. I usually do this in the dialog constructor.
Something
important to know is that when we’re getting the selected City from the combo
options, we’ve to ask for the Cities property (and not for the one that we use
to store the selection)
When you execute
the report you will get a dialog like this:
And then when you confirm the dialog you will get the employees info filtered by city.(In this case London)
So that's it for combos. In the next
post I’ll show you how to work with autocompletes.
You can get the source code of NRapid from here
You can get the source code of NRapid from here
And the sample app from here
The Northwind database is available from download at http://www.microsoft.com/en-us/download/details.aspx?id=23654
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