科目映射表：序号固定用规则编号，账单项目增加与其他条件一致的下拉筛选

resources/views/business/pages/financial-rules/account-mapping.blade.php

@@ -317,6 +317,12 @@
             <span>搜索</span>
             <input type="search" id="amKeyword" placeholder="平台 / 账单项目 / 备注 / 科目">
         </label>
+        <label class="upstream-data-field">
+            <span>账单项目</span>
+            <select id="amItem">
+                <option value="">全部</option>
+            </select>
+        </label>
         <label class="upstream-data-field">
             <span>平台</span>
             <select id="amPlatform">
@@ -429,6 +435,7 @@
     var countEl = document.getElementById('amCount');
     var kw = document.getElementById('amKeyword');
     var fPlatform = document.getElementById('amPlatform');
+    var fItem = document.getElementById('amItem');
     var fCategory = document.getElementById('amCategory');
     var fBasis = document.getElementById('amBasis');
     var fOnly = document.getElementById('amOnly');
@@ -518,6 +525,7 @@
         var keyword = (kw.value || '').trim().toLowerCase();
         return ROWS.filter(function (r) {
             if (fPlatform.value && r.platform !== fPlatform.value) { return false; }
+            if (fItem.value && r.item !== fItem.value) { return false; }
             if (fCategory.value && r.category !== fCategory.value) { return false; }
             if (fBasis.value && r.basis !== fBasis.value) { return false; }
             if (fOnly.value) {
@@ -538,7 +546,7 @@
         var edit = (editingId === r.id && draft);
         if (edit) {
             return '<tr class="am-item is-editing" data-id="' + r.id + '">'
-                + '<td class="am-index">' + (index + 1) + '</td>'
+                + '<td class="am-index">' + r.id + '</td>'
                 + '<td class="am-edit-cell"><input data-f="platform" value="' + esc(draft.platform) + '" list="amPlatformList"></td>'
                 + '<td class="am-edit-cell"><input data-f="item" value="' + esc(draft.item) + '"></td>'
                 + '<td class="am-edit-cell"><input data-f="memo" value="' + esc(draft.memo) + '" placeholder="不限就填 -"></td>'
@@ -555,7 +563,7 @@
                 + '</div></td></tr>';
         }
         return '<tr class="am-item" data-id="' + r.id + '" data-index="' + index + '">'
-            + '<td class="am-index">' + (index + 1) + '</td>'
+            + '<td class="am-index">' + r.id + '</td>'
             + '<td>' + esc(r.platform) + '</td>'
             + '<td><span class="am-caret">▶</span> <span title="' + esc(r.item) + '">' + esc(r.item) + '</span></td>'
             + '<td><span title="' + esc(r.memo) + '">' + esc(r.memo || '-') + '</span></td>'
@@ -678,6 +686,20 @@
         var cats = (OPTIONS.categories || []).slice();
         (fCategory.value ? [fCategory.value] : []).forEach(function (v) { if (cats.indexOf(v) < 0) { cats.push(v); } });
         fill(fCategory, cats, fCategory.value);
+        rebuildItemOptions();
+    }
+
+    // 账单项目筛选：和其他筛选一样用下拉，选项按当前选中的平台收窄
+    function rebuildItemOptions() {
+        var platform = fPlatform.value || '';
+        var seen = {};
+        ROWS.forEach(function (r) {
+            if (platform && r.platform !== platform) { return; }
+            if (r.item) { seen[r.item] = true; }
+        });
+        var items = Object.keys(seen).sort();
+        if (fItem.value && items.indexOf(fItem.value) < 0) { items.unshift(fItem.value); }
+        fill(fItem, items, fItem.value);
     }
 
     function fill(select, values, current) {
@@ -1092,12 +1114,15 @@
     document.getElementById('amHistoryBtn').addEventListener('click', openHistory);
 
     /* ---------- 筛选 ---------- */
-    [kw, fPlatform, fCategory, fBasis, fOnly].forEach(function (el) {
+    [kw, fPlatform, fItem, fCategory, fBasis, fOnly].forEach(function (el) {
         el.addEventListener('input', render);
         el.addEventListener('change', render);
     });
+    // 换平台时，账单项目下拉的选项跟着换（原来选的项目保留在列表里）
+    fPlatform.addEventListener('change', rebuildItemOptions);
     document.getElementById('amResetFilter').addEventListener('click', function () {
-        kw.value = ''; fPlatform.value = ''; fCategory.value = ''; fBasis.value = ''; fOnly.value = '';
+        kw.value = ''; fPlatform.value = ''; fItem.value = ''; fCategory.value = ''; fBasis.value = ''; fOnly.value = '';
+        rebuildItemOptions();
         render();
     });
 
@@ -1107,6 +1132,7 @@
     });
 
     render();
+    rebuildItemOptions();
 
     // 后台预取账套科目清单（160KB 左右）。不做这一步的话，第一次点「编辑」要等它下载完
     // 才有反应，用户会以为按钮坏了。