p:dataTable selections are lost after paginating a LazyDataModel

Question

My problem is that after I\'ve selected a few items on the 1st page, if I paginate to another page and come back, my initial selections are not shown. I\'ve tried to impleme

Answer 1

In webPage just add a event for when page switch:

In the listingBean, just save the selected:

private List selectedInstances;
private List selectedInstancesSaved;

public List getSelectedInstances()
{
    return selectedInstancesSaved;
}

public void setSelectedInstances(List selectedInstances)
{
    this.selectedInstances = selectedInstances;
}

public void updateSelected()
{
    if (selectedInstances != null && !selectedInstances.isEmpty()) {
        for (Entity inst : lazyModel.getDatasource()) {
            if (selectedInstances.contains(inst)) {
                selectedInstancesSaved.add( inst);
            } else {
                selectedInstancesSaved.remove( inst);
            }
        }
    }
}