selectAll

selects all items or the specified range

void selectAll( [string from,string to] );

from	string	the id of an item that selection will be started from
to	string	the id of an item that selection will be ended with

webix.ui({
    view:"dataview",
    id:"data",
    ...
});
$$('data').selectAll(); //selects all items in dataview

Details

If the parameters aren't specified, all items will be selected.