Grid v8 Converter

Vaadin 6 / 7 / 8
1

Hi,

while experimenting with the new Grid (v8) API, I wondered how to set a converter on a (databound) Column.
In v7 Grid it was possible via e.g. grid.getColumn(“column”).setConverter(new StringToDateConverter());

Anybody got ideas?

2

You need to use Binder
https://vaadin.com/framework/whatsnew
15. Eager field validation.

Instead of .withValidator, you can use .withConverter(new StringToDateConverter())

3

That was my first thought too, but Binder only works for Fields, not for Grid

4

You want to format date in grid ?
Something like this ?:

grid.addColumn(SpisUIDTO::getDatumACasVytvoreniaSpisu,new DateRenderer(new SimpleDateFormat(ComponentsHelper.DATETIME_FORMAT))).setId(Columns.DATUMACAS_VYTVORENIA_SPISU.dtoName)
5

That solves the date formatting problem, but other converters still don’t work

6

Sorry, but theres no such thing as setConverter on Grid.Column object (APIs changed)
But you can use NumberRenderer, DateRenderer…

7

Yeah, I thought so, too.

Unfortunately Renderers don’t provide the same functionality as they are client side components (e.g. converting an int to an String is not possible, as far as I know).
Renderers already existed in Grid v7 parallel to Converters.

Anyway, thanks for the help.

UPDATE: I found a workaround: Adding a normal column without databinding (meaning it returns a String in the ValueProvider) gives the same functionality.

8

I have the same issues
https://vaadin.com/forum#!/thread/15407556

9

How does that work? Where do you add the converter ? on the TextField ?

10

grid.addColumn(item → myConverter.convertToPresentation(item.getXyz(), String.class, null)).setCaption(“Converter Column”);

11

I think it should be possible to change the ValueProvider or give a kind of converter after columns have been created… opened a ticket for that one: https://github.com/vaadin/framework/issues/9280