abd4c160_Editing_Options__Description
[Property] dataUrl [Type] string [Description] 
This option is valid only for the elements of type select - i.e., edittype:select and should represent the url for getting the data that should contain the select definition. The data is obtained via ajax call and should be a valid html select element with the desired options One…. In this case you can use option group. The ajax request is called only once when the element is created. In inline edit or cell edit module it is called every time when you edit a new row or cell. In form edit module only once.
Editing Options
Description