onBeforeSort

fires before sorting of the dataset

boolean onBeforeSort(string/function/undefined by,string/undefined dir,string/function as);

string/function/undefinedthe template of the sort-by field dir

string/undefinedthe direction of sorting as

string/functionthe 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.

If the third param is a function, the parameters of such a function are the following:

table.sort("#fieldName#", "desc", function(a, b, prop) {
   return a[prop] - b[prop];
})