add stories for expand row

packages/react-bootstrap-table2-example/src/utils/common.js

@@ -68,3 +68,17 @@ export const stockGenerator = (quantity = 5) =>
   }));
 
 export const sleep = ms => new Promise(resolve => setTimeout(resolve, ms));
+
+export const productsExpandRowsGenerator = (quantity = 5, callback) => {
+  if (callback) return Array.from({ length: quantity }, callback);
+
+  // if no given callback, retrun default product format.
+  return (
+    Array.from({ length: quantity }, (value, index) => ({
+      id: index,
+      name: `Item name ${index}`,
+      price: 2100 + index,
+      expand: productsQualityGenerator(index)
+    }))
+  );
+};