Revised the accounting reordering to handle the cases with only one account or no account.

src/accounting/static/js/account-order.js

@@ -24,6 +24,7 @@
 // Initializes the page JavaScript.
 document.addEventListener("DOMContentLoaded", function () {
     const list = document.getElementById("account-order-list");
+    if (list !== null) {
         const onReorder = function () {
             const accounts = Array.from(list.children);
             for (let i = 0; i < accounts.length; i++) {
@@ -34,4 +35,5 @@ document.addEventListener("DOMContentLoaded", function () {
             }
         };
         initializeDragAndDropReordering(list, onReorder);
+    }
 });

src/accounting/templates/accounting/account/order.html

@@ -37,7 +37,8 @@ First written: 2023/2/2
   </a>
 </div>
 
-<form action="{{ url_for("accounting.account.sort", base=base) }}" method="post">
+{% if base.accounts|length > 1 %}
+  <form action="{{ url_for("accounting.account.sort", base=base) }}" method="post">
     <input id="csrf_token" type="hidden" name="csrf_token" value="{{ csrf_token() }}">
     {% if "next" in request.args %}
       <input type="hidden" name="next" value="{{ request.args["next"] }}">
@@ -67,6 +68,15 @@ First written: 2023/2/2
         <i class="fa-solid fa-floppy-disk"></i>
       </button>
     </div>
-</form>
+  </form>
+{% elif base.accounts|length == 1 %}
+  <ul class="list-group mb-3">
+    <li class="list-group-item">
+      {{ base.accounts[0] }}
+    </li>
+  </ul>
+{% else %}
+  <p>{{ A_("There is no data.") }}</p>
+{% endif %}
 
 {% endblock %}