onBeforeAdd

fires before adding an item to the datastore

function onBeforeAdd(
    // the ID of the newly added data item
    id: string|number,
    // data for the new item
    obj: object,
    // the index, at which the new item will be added
    index: number
): boolean

Returns

boolean false, if the operation needs to be cancelled

Example

grid.data.attachEvent("onBeforeAdd", function(id, obj, index){
  if (obj.text == "")
    return false;
});

Details

Returning false from the event handler will block further processing, and the item will not be added.