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

Just implement the property bound to selection property of DataTable (selection="#{pageBackingForm.selectedEntityList}") like this and it will work :

    private Map> selectedEntityListMap = new Hashtable<>();

    public List getSelectedEntityList() {
        return selectedEntityListMap.get(getCurrentEntitySelectionPage());
    }

    public void setSelectedEntityList(List selectedEntityList) {
        if (selectedEntityList == null) {
            selectedEntityListMap.remove(getCurrentEntitySelectionPage());
            return;
        }

        selectedEntityListMap.put(getCurrentEntitySelectionPage(), selectedEntityList);
    }

    public Integer getCurrentEntitySelectionPage() {
        DataTable dataTable = (DataTable) FacesContext.getCurrentInstance().getViewRoot().findComponent("formId:dataTableId");
        return dataTable.getPage();
    }