在GWT中等待CellTable的数据

Question

I'm using GWT 2.4 with RequestFactory mechanism. With bigger portions of data there is some extra time (1-2 sec) for celltables to get populated. During that time celltable is empty and user doesn't know if anything will appear in it. Is there any way to enable waiting indicator for celltables for the time they are being populated?

I've already configured waiting indicator for RequestFactory calls, so I've got prepared images for it, but I don't know how to do it.

Thanks.

Answer 1

You can use setLoadingIndicator API of CellTable -

cellTable.setLoadingIndicator( Your customised loading indicator widget );

Widget can be a image wrapped with in a panel or just an image.

If you are using the ListDataProvider you need to code some more lines. When you do addDataDisplay method call it internally updates the row count to 0. With this Tables's state gets changed to Loaded. So we don't get the loading image.

Workaround is, do addDataDisplay method call only just before the dataProvider.setList call.

Answer 2

Before you are calling the setLoadingIndicator you have to call the below method

cellTable.setVisibleRangeAndClearData(cellTable.getVisibleRange(),
   true);