Added support for data attributes

dist/js/bootstrap-multiselect.js

@@ -1413,24 +1413,39 @@
                     });
                     
                     forEach(option.children, function(subOption) { // add children option tags
-                        $tag.append($('<option/>').attr({
+                        var attributes = {
                             value: subOption.value,
                             label: subOption.label || subOption.value,
                             title: subOption.title,
                             selected: !!subOption.selected,
                             disabled: !!subOption.disabled
-                        }));
+                        };
+                        
+                        //Loop through attributes object and add key-value for each attribute    
+                       for (var key in subOption.attributes) {
+                            attributes['data-' + key] = subOption.attributes[key];
+                       }
+                         //Append original attributes + new data attributes to option       
+                        $tag.append($('<option/>').attr(attributes));
                     });
                 }
                 else {
-                    $tag = $('<option/>').attr({
+                    
+                    var attributes = {
                         value: option.value,
                         label: option.label || option.value,
                         title: option.title,
                         class: option.class,
                         selected: !!option.selected,
                         disabled: !!option.disabled
-                    });
+                    };
+                    //Loop through attributes object and add key-value for each attribute    
+                    for (var key in option.attributes) {
+                      attributes['data-' + key] = option.attributes[key];
+                    }
+                    //Append original attributes + new data attributes to option
+                    $tag = $('<option/>').attr(attributes);
+                    
                     $tag.text(option.label || option.value);
                 }