fix: 采购价格上限按数量计算总价 (#181)

admin/static/js/app.js

@@ -229,6 +229,32 @@
     var form = document.querySelector("[data-purchase-form]");
     if (!openButtons.length || !form) return;
     var submitButton = form.querySelector("[data-purchase-submit]");
+
+    function updateTotalPrice(row) {
+      var input = row.querySelector("[data-unit-price-input]");
+      var output = row.querySelector("[data-total-price-output]");
+      var quantity = Number(row.getAttribute("data-purchase-quantity"));
+      if (!input || !output || !Number.isInteger(quantity) || quantity <= 0) return;
+      var raw = input.value.trim();
+      var match = /^(\d+)(?:\.(\d{1,2}))?$/.exec(raw);
+      if (!match) {
+        output.textContent = "—";
+        return;
+      }
+      var fraction = (match[2] || "").padEnd(2, "0");
+      var unitCent = Number(match[1]) * 100 + Number(fraction || "0");
+      var totalCent = unitCent * quantity;
+      if (!Number.isSafeInteger(totalCent) || totalCent <= 0) {
+        output.textContent = "—";
+        return;
+      }
+      output.textContent = "¥" + Math.floor(totalCent / 100) + "." + String(totalCent % 100).padStart(2, "0");
+    }
+
+    form.querySelectorAll("[data-purchase-row]").forEach(function (row) {
+      var input = row.querySelector("[data-unit-price-input]");
+      if (input) input.addEventListener("input", function () { updateTotalPrice(row); });
+    });
     openButtons.forEach(function (openButton) {
       openButton.addEventListener("click", function () {
         var selected = {};
@@ -247,6 +273,7 @@
           row.querySelectorAll("input").forEach(function (input) {
             input.disabled = !enabled;
           });
+          if (enabled) updateTotalPrice(row);
           if (enabled) shown += 1;
         });
         var empty = form.querySelector("[data-purchase-empty]");