[frontend] fix

frontend/src/components/Cart.tsx

@@ -170,7 +170,7 @@ const Cart = ({ products, cartInfo, refresh }: Props) => {
       alert('please wait for the checkout data');
       return;
     }
-    if (getValues('card_id') === null) {
+    if (!getValues('card_id')) {
       if (checkoutData.payments.length === 0) {
         alert('please add a card');
       } else {

frontend/src/pages/user/seller/allCoupons/[sellerCouponID].tsx

@@ -264,9 +264,13 @@ const EachSellerCoupon = () => {
     if (!resp.ok) {
       if (resp.status === 500) {
         alert("error on modifying coupon, please check your shop's status");
+        navigate('/user/seller/manageCoupons');
+      } else {
+        const response = await resp.json();
+        alert(response.message);
       }
+    } else {
       navigate('/user/seller/manageCoupons');
-      return;
     }
   };
 

frontend/src/pages/user/seller/allCoupons/newCoupon.tsx

@@ -95,11 +95,10 @@ const NewSellerCoupon = () => {
           if (!resp.ok) {
             if (resp.status === 500) {
               alert("error on adding tag, please check your shop's status");
+              navigate('/user/seller/manageCoupons');
             } else {
               alert('error when creating new tag');
             }
-            navigate('/user/seller/manageCoupons');
-            return;
           } else {
             const response = await resp.json();
             append({ name: newTagName, tag_id: response.id });
@@ -196,12 +195,13 @@ const NewSellerCoupon = () => {
     if (!resp.ok) {
       if (resp.status === 500) {
         alert("error on creating coupon, please check your shop's status");
+        navigate('/user/seller/manageCoupons');
       } else {
         const response = await resp.json();
         alert(response.message);
       }
+    } else {
       navigate('/user/seller/manageCoupons');
-      return;
     }
   };
 

frontend/src/pages/user/seller/allProducts/[sellerGoodsID].tsx

@@ -228,10 +228,13 @@ const EachSellerGoods = () => {
           navigate('/user/seller/manageProducts');
           return;
         }
+      } else {
+        navigate('/user/seller/manageProducts');
       }
       return await response.json();
     },
     onSuccess: (responseData: PatchResponseProps) => {
+      // set value is redundant
       setValue('name', responseData.name);
       setValue('description', responseData.description);
       setValue('price', responseData.price);