added full project files

static/js/invoice.js

@@ -0,0 +1,62 @@
+// Subcontractor autocomplete functionality
+    $(document).ready(function () {
+      $("#subcontractor").keyup(function () {
+        let query = $(this).val();
+        if (query !== "") {
+          $.ajax({
+            url: "/search_subcontractor",
+            method: "POST",
+            data: { query: query },
+            success: function (data) {
+              $("#subcontractor_list").fadeIn().html(data);
+            }
+          });
+        } else {
+          $("#subcontractor_list").fadeOut();
+        }
+      });
+
+      $(document).on("click", "li", function () {
+        $("#subcontractor").val($(this).text());
+        $("#subcontractor_id").val($(this).attr("data-id"));
+        $("#subcontractor_list").fadeOut();
+      });
+    });
+
+    // Success Alert: show alert and reload after 3 seconds
+    function showSuccessAlert() {
+      const alertBox = document.getElementById("invoiceSuccessAlert");
+      alertBox.classList.add("show");
+      setTimeout(() => {
+        alertBox.classList.remove("show");
+        // Reload page or redirect after alert hides
+        window.location.href = '/add_invoice';
+      }, 3000);
+    }
+
+    // Submit form via AJAX
+    $("#invoiceForm").on("submit", function (e) {
+      e.preventDefault();
+      let formData = $(this).serialize();
+      $.ajax({
+        url: '/add_invoice',
+        method: 'POST',
+        data: formData,
+        success: function (response) {
+          if(response.status === "success") {
+            showSuccessAlert();
+          } else {
+            alert(response.message);
+          }
+        },
+        error: function (xhr, status, error) {
+          alert("Submission failed: " + error);
+        }
+      });
+    });
+
+
+
+window.onload = function () {
+        document.getElementById('subcontractor').focus();
+    };