add validation for signup not using html

js/validation.js

@@ -101,4 +101,17 @@ function getEmailValidation(){
         }
         xmlhttp.send();
     }	
-}
\ No newline at end of file
+}
+
+document.addEventListener('DOMContentLoaded', function() {
+   setInterval(function(){
+        if (document.getElementById("name").value.length > 0 && document.getElementById("checkUsername").style.display !== "none" && 
+        document.getElementById("checkEmail").style.display !== "none" && document.getElementById("password").value.length > 0 && 
+        document.getElementById("password_conf").value.length > 0 && document.getElementById("phone").value.length > 0){
+            document.getElementById("submit").disabled = false;
+        }
+        else {
+            document.getElementById("submit").disabled = true;
+        }
+   }, 500);    
+ }, false);
\ No newline at end of file

signup.php

@@ -92,7 +92,7 @@ if(isset($_POST["submit"])){
                             <a href="login.php">Already have an account ?</a>
                         </div>
                         <div class="submit">
-                            <input type="submit" name="submit" value="REGISTER">                            
+                            <input id="submit" type="submit" name="submit" value="REGISTER">                            
                         </div>
                     </div>
                 </form>