onBeforeSort

fires before sorting of the dataset

boolean onBeforeSort(string/function by,string dir,string/function as){ ... };

by	string/function	the template of the sort-by field
dir	string	the direction of sorting
as	string/function	the type of sorting

boolean

returning false will prevent sorting

view.data.attachEvent("onBeforeSort", function(by, dir, as){
    //... some code here ...
});

Details

Returning false from the event handler will block further processing, and data will not be sorted.