beforeColumnDrag

fires before a user drags a column

boolean beforeColumnDrag(string id){ ... };

string

the column Id

boolean

false - to prevent dragging a column, otherwise true

Available only in PRO Edition

grid.events.on("BeforeColumnDrag", function(id){
    // your logic here
    return false;
});

Details

This functionality requires PRO version of the dhtmlxGrid (or DHTMLX suite) package.