diff --git a/static/webui/script.js b/static/webui/script.js
index 6798bb87..5d760f0b 100644
--- a/static/webui/script.js
+++ b/static/webui/script.js
@@ -1515,7 +1515,7 @@ function doAcquireEvolution() {
     setEvolutionProgress([{ ItemType: uniqueName, Rank: permanentEvolutionWeapons.has(uniqueName) ? 0 : 1 }]);
 }
 
-$("input[list]").on("input", function () {
+$(document).on("input", "input[list]", function () {
     $(this).removeClass("is-invalid");
 });
 
@@ -2832,29 +2832,27 @@ function handleModularPartsChange(event) {
     const modularParts = [];
     inputs.forEach(input => {
         const key = getKey(input);
-        if (!getKey(input)) {
-            input.addClass("is-invalid");
+        if (!key) {
+            input.classList.add("is-invalid");
         } else {
             modularParts.push(key);
         }
     });
 
-    revalidateAuthz().then(() => {
-        console.log({
-            category: urlParams.get("productCategory"),
-            oid: urlParams.get("itemId"),
-            modularParts
+    if (inputs.length == modularParts.length) {
+        revalidateAuthz().then(() => {
+            $.post({
+                url: "/custom/changeModularParts?" + window.authz,
+                contentType: "application/json",
+                data: JSON.stringify({
+                    category: urlParams.get("productCategory"),
+                    oid: urlParams.get("itemId"),
+                    modularParts
+                })
+            }).then(function () {
+                toast(loc("code_succChange"));
+                updateInventory();
+            });
         });
-        $.post({
-            url: "/custom/changeModularParts?" + window.authz,
-            contentType: "application/json",
-            data: JSON.stringify({
-                category: urlParams.get("productCategory"),
-                oid: urlParams.get("itemId"),
-                modularParts
-            })
-        }).then(function () {
-            updateInventory();
-        });
-    });
+    }
 }
diff --git a/static/webui/translations/de.js b/static/webui/translations/de.js
index 91bae657..0ddb6eb0 100644
--- a/static/webui/translations/de.js
+++ b/static/webui/translations/de.js
@@ -61,6 +61,7 @@ dict = {
     code_pigment: `Pigment`,
     code_mature: `Für den Kampf auswachsen lassen`,
     code_unmature: `Genetisches Altern zurücksetzen`,
+    code_succChange: `[UNTRANSLATED] Successfully changed.`,
     login_description: `Melde dich mit deinem OpenWF-Account an (denselben Angaben wie im Spiel, wenn du dich mit diesem Server verbindest).`,
     login_emailLabel: `E-Mail-Adresse`,
     login_passwordLabel: `Passwort`,
diff --git a/static/webui/translations/en.js b/static/webui/translations/en.js
index 11ca6054..b95e2c66 100644
--- a/static/webui/translations/en.js
+++ b/static/webui/translations/en.js
@@ -60,6 +60,7 @@ dict = {
     code_pigment: `Pigment`,
     code_mature: `Mature for combat`,
     code_unmature: `Regress genetic aging`,
+    code_succChange: `Successfully changed.`,
     login_description: `Login using your OpenWF account credentials (same as in-game when connecting to this server).`,
     login_emailLabel: `Email address`,
     login_passwordLabel: `Password`,
diff --git a/static/webui/translations/es.js b/static/webui/translations/es.js
index 7d117f7e..6a1fc379 100644
--- a/static/webui/translations/es.js
+++ b/static/webui/translations/es.js
@@ -61,6 +61,7 @@ dict = {
     code_pigment: `Pigmento`,
     code_mature: `Listo para el combate`,
     code_unmature: `Regresar el envejecimiento genético`,
+    code_succChange: `[UNTRANSLATED] Successfully changed.`,
     login_description: `Inicia sesión con las credenciales de tu cuenta OpenWF (las mismas que usas en el juego al conectarte a este servidor).`,
     login_emailLabel: `Dirección de correo electrónico`,
     login_passwordLabel: `Contraseña`,
diff --git a/static/webui/translations/fr.js b/static/webui/translations/fr.js
index 16822200..f83433e9 100644
--- a/static/webui/translations/fr.js
+++ b/static/webui/translations/fr.js
@@ -61,6 +61,7 @@ dict = {
     code_pigment: `Pigment`,
     code_mature: `Maturer pour le combat`,
     code_unmature: `Régrésser l'âge génétique`,
+    code_succChange: `[UNTRANSLATED] Successfully changed.`,
     login_description: `Connexion avec les informations de connexion OpenWF.`,
     login_emailLabel: `Email`,
     login_passwordLabel: `Mot de passe`,
diff --git a/static/webui/translations/ru.js b/static/webui/translations/ru.js
index 9e882d8f..20720f84 100644
--- a/static/webui/translations/ru.js
+++ b/static/webui/translations/ru.js
@@ -61,6 +61,7 @@ dict = {
     code_pigment: `Пигмент`,
     code_mature: `Подготовить к сражениям`,
     code_unmature: `Регрессия генетического старения`,
+    code_succChange: `Успешно изменено.`,
     login_description: `Войдите, используя учетные данные OpenWF (те же, что и в игре при подключении к этому серверу).`,
     login_emailLabel: `Адрес электронной почты`,
     login_passwordLabel: `Пароль`,
diff --git a/static/webui/translations/zh.js b/static/webui/translations/zh.js
index 03de906a..4372fb16 100644
--- a/static/webui/translations/zh.js
+++ b/static/webui/translations/zh.js
@@ -61,6 +61,7 @@ dict = {
     code_pigment: `颜料`,
     code_mature: `成长并战备`,
     code_unmature: `逆转衰老基因`,
+    code_succChange: `[UNTRANSLATED] Successfully changed.`,
     login_description: `使用您的 OpenWF 账户凭证登录(与游戏内连接本服务器时使用的昵称相同).`,
     login_emailLabel: `电子邮箱`,
     login_passwordLabel: `密码`,