check duplicate paypar account no issue

app/views/crm/customers/_new_form.html.erb

@@ -244,8 +244,11 @@
   </div>
 </div>
 <script type="text/javascript">
-
+  var paypar_account_no = [];
   $(function() {
+    paypar_account_no = JSON.parse('<%= @paypar_accountno.to_json.html_safe %>');
+    console.log(paypar_account_no);
+
 // Read Card Reader
     $("#paypar_account_no").on('focus', function(e){               
       if($(this).val() == ''){
@@ -272,9 +275,23 @@
   // get CardNo from Java
   function setCardNo(cardNo){
     if(cardNo.length == 16){
-      $("#paypar_account_no").val(cardNo);
-      $("#search").val(cardNo);
-      $("#type").val("card");
+      if($.inArray(cardNo, paypar_account_no) !== -1){
+        $("#paypar_account_no").val(cardNo);
+        $("#search").val(cardNo);
+        $("#type").val("card");
+      }else{
+        swal({
+          title: 'Oops',
+          text: 'CardNo already registered, Please try another card!',
+          type: 'error',
+          html: true,
+          closeOnConfirm: false,
+          closeOnCancel: false,
+          allowOutsideClick: false
+        }, function () {
+          window.location.reload();
+        });
+      }
     }
   }