check ip

public/assets/js/script.js

@@ -14,10 +14,19 @@ let deleteEvent = (v, message, url) => {
   });
 };
 
-d.querySelectorAll('.js-group-btn-delete').forEach(v => {
+d.querySelectorAll(".js-group-btn-delete").forEach(v => {
   deleteEvent(v, "You're sure to delete this group?", "/groups/delete")
 });
 
 d.querySelectorAll(".js-server-btn-delete").forEach(v => {
   deleteEvent(v, "You're sure to delete this server?", "/servers/delete")
+});
+
+d.querySelector(".js-server-form-on-submit").addEventListener("submit", e=>{
+  let check_ip = /^((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$/;
+  let ip = e.target.ip;
+  if (!check_ip.exec(ip.value)){
+    e.preventDefault()
+    ip.focus()
+  }
 });