Filter DataProvider

Vaadin 6 / 7 / 8
1

I using this code to create infinit scroll

myGrid.setDataProvider( (sortOrder, offset, limit) -> protocoloService.findAll(offset,limit).stream(),
    ()-> protocoloService.count().intValue() );

So can I filter this dataProvider?

I try to use myGrid.getDataProvider().

but don`t have the filter method

tks

2

You have to cast the DataProvider to ListDataProvider… then you’ll see different addFilter methods.

3

You can also filter lazy data providers, e.g. a CallBackDataProvider; the second type parameter of

DataProvider<POJOTYPE, FILTERTYPE> myProvider = DataProvider.fromFilteringCallbacks(query -> ..., query -> ...); is the type of the Filter object (usually a String). You need to use a configurable filter data provider wrapper object to add a filter dynamically:

ConfigurableFilterDataProvider<POJOTYPE, Void, FILTERTYPE> filteredProvider = dataProvider.withConfigurableFilter(); myGrid.setDataProvider(filteredProvider); Then you can just do this to filter:

filteredProvider.setFilter(filterObject); // maybe filterObject = "myFilterString"; The filter object will find its way to your Query objects as an Optional (see the original fromFilteringCallbacks) and you can use that when doing your backend data queries.

-Olli

4

So to answer Fabio’s original question shortly, you need to take your data provider creation out of the setDataProvider() call and use a ConfigurableFilterDataProvider wrapper to add filtering.

-Olli

5

Olli, what is a FILTERTYPE?

There is a sample where I can look? or doc? tks

6

Hi,

FILTERTYPE in my example is the class of the filter. In actuality it can be something like

DataProvider<MyPojo, String> provider = DataProvider.fromFilteringCallbacks(...) or

DataProvider<MyPojo, Duration> provider = DataProvider.fromFilteringCallbacks(...) but it can be any class you want.

The setFilter method then takes a String in the first case, Duration in the second case and so on.

-Olli

7

There’s a real example in the Lazy section of the data model Docs here: https://vaadin.com/docs/-/part/framework/datamodel/datamodel-providers.html#datamodel.dataproviders.lazy

Scroll down to Filtering (it’s quite a long way down).

-Olli