Using Vaadin 7.4.9 - How to delete data from the grid

Question

I need to delete data from the grid (container) and then i need refresh the rows. How I can do it?

Grid grid = new Grid();
IndexedContainer container = new I         


        

Answer 1

Using Vaadin 7.4.9 is very tedious when it comes to Grids.

Removing items has to be done using container.removeItem(item).

Additionally refreshing a Grid is easy in Vaadin 7.7 (method addition of refreshAll and refreshRow()) and especially easy in Vaadin 8 (using events and a Dataprovider).

In Vaadin 7 you will have to hack it a bit by calling clearSortOrder which automatically redraws the grid.

The following code is used when you update the UI from another Thread (i.e. not in a ValueChangeListener) however you need to enable the Vaadin-Push Addon which is a separate dependency.

getUI.access(() -> {
        List sortOrders = new ArrayList<>();
        grid.getSortOrder().forEach(sortOrder -> sortOrders.add(sortOrder));
        grid.recalculateColumnWidths();
        grid.clearSortOrder();
        grid.setSortOrder(sortOrders);

        getUI().push();
    });

Edit: If you do the deletion with a buttonClick or ValueChangeEvent of a combobox you can simply do:

component.addValueChangeListener(e -> {

         Item item = container.getItem(35);
         container.removeItem(item);    

         container.addItem(35);

         item.getItemProperty("Person5").setValue("SS");

         grid.recalculateColumnWidths();
         grid.clearSortOrder();
         grid.refreshAllRows();

     });

However be careful, your implementation has a ValueChangeListener on the container which calls container.removeItem(35) this will result in another trigger another ValueChanged-Event which will try to remove item number 35 again. You have to use another component for the ValueChangeListener otherwise you run into an endless cycle