Made editions in PR

modules/UI/welcome_page/WelcomePage.js

 
 var animateTimeout, updateTimeout;
 
-function enter_room() {
-    var val = $("#enter_room_field").val();
+function enterRoom() {
+    const $enterRoomField = $("#enter_room_field");
+
+    var val = $enterRoomField.val();
     if(!val) {
-        val = $("#enter_room_field").attr("room_name");
+        val = $enterRoomField.attr("room_name");
     }
     if (val) {
         window.location.pathname = "/" + val;
     }
 
     $("#enter_room_button").click(function() {
-        enter_room();
+        enterRoom();
     });
 
     $("#enter_room_field").keydown(function (event) {
         if (event.keyCode === 13 /* enter */) {
-            enter_room();
+            enterRoom();
         }
     });