refactor GridView helpers

helpers/DepartmentGrid.php

@@ -2,9 +2,6 @@
 
 namespace app\helpers;
 
-use yii\helpers\Html;
-use yii\helpers\Url;
-
 class DepartmentGrid extends CommonGrid {
 
     public static function pid($departmentArray) {
@@ -13,24 +10,4 @@ class DepartmentGrid extends CommonGrid {
         };
     }
 
-    public static function checkbox() {
-        return function($model) {
-            if ($model->id == 1)
-                return "";
-            return "<input type='checkbox' value='{$model->id}' name='checkbox-department' class='checkbox-department'>";
-        };
-    }
-
-    public static function rows() {
-        return function($model, $index, $widget, $grid) {
-            return [
-                "onclick" => "common.form(this, 'department');",
-                "style" => "cursor: pointer;",
-                "data" => [
-                    "href" => Url::to(["update", "id" => $model->id])
-                ]
-            ];
-        };
-    }
-
 }