Vaadin：在Vaadin中更新网格后，如何关注第一行？

Question

i'm building a Vaadin application with a Grid table within. The application reloads and updates every minute the table. SelectionMode.NONE and v-grid-row-focused are used. Unfortunately, the focus on the first row in the grid table disappears after each data refreshing.After some analysis I found out that after each table reloading the grid returns to v-grid-cell-focused -mode and only after pressing the arraydown-button for scrolling down the row focus it changes to the v-grid-row-focused -mode. Is there a way to completely disable v-grid-cell-focused -mode?

Answer 1

to get the 1st itemId (not Item) of a Table or Grid, you must go through the Container.firstItemId

Tables has an assessor method to this, but Grid doesn't

The solution proposed by Morfic won't work always, because the integer autogenerated by the containers when you use addItem() with no parameters (Indexed and Hierarchical) is incremental, if u clean/remove all/some items, the index will keep growing (not reset to 0) AND the index STARTS from 1, not 0 (if you check the source code), or if your implementation has the capacity to remove Items from the Container and the 1st one is removed, the ZERO index won't exist anymore

grid.select(grid.getContainerDataSource().getIdByIndex(0));

Answer 2

There is no method in Grid to set focused cell from server side. However I added such method setFocusedCell(row,col) in GridFastNavigation add-on extension for Vaadin 8.

https://vaadin.com/directory/component/gridfastnavigation-add-on