setting for reload page and login

calc/categories/length.php

 <?php
+
 if (file_exists('dbconnect.php')) {
   require('dbconnect.php');
   if (mysqli_connect_error()) {
       die('Connect Error (' . mysqli_connect_errno() . ')' . mysqli_connect_error());
   }
 }
+
 //Add function files
 require('options.php');
 if (file_exists('../includes/functions.php')) {
@@ -159,15 +161,15 @@ function length_options(){
           <!-- calculator input and output-->
           <!--Add function to recieve number,
                     Be able to input number from either box.-->
-          <input id="Input" class="Input-text" placeholder="Enter amount" name="from_value" value="<?php echo $from_value; ?>" />&nbsp; <label for="Input" class="Input-label">Your entry</label>
+          <input id="from_value" class="Input-text" placeholder="Enter amount" name="from_value" value="<?php echo $from_value; ?>" />&nbsp; <label for="Input" class="Input-label">Your entry</label>
           <label for="input" class="Input-label">Your Entry</label>
-          <select name="from_unit">
+          <select id="from_unit"name="from_unit">
             <?php echo length_options(); ?>
           </select>
           <br>
-          <input id="Input" class="Input-text" placeholder="Wait for it" name="to_value" value=" <?php echo $to_value; ?>" />&nbsp;
+          <input readonly id="Input" class="Input-text" placeholder="Wait for it" name="to_value" value=" <?php echo $to_value; ?>" />&nbsp;
           <label for="input" class="input-label">Converted result</label>
-          <select name="to_unit">
+          <select id = "to_unit" name="to_unit">
             <?php echo length_options(); ?>
           </select>
 

calc/js/slide.js

@@ -7,3 +7,17 @@ function closeSlideMenu(){
 document.getElementById('side-menu').style.width = '0';
 document.getElementById('main').style.marginLeft = '0';
 }
+
+function checkForm(){
+  var from_unit = document.getElementById("from_unit").value;
+  var to_unit = document.getElementById("to_unit'").value;
+  var from_value = document.getElementById("from_value").value;
+  var to_value = document.getElementById("to_value").value;
+  //
+  if (isNaN(num1)){
+    document.w
+
+  }
+  document.getElementById("myForm").submit();
+
+}
\ No newline at end of file

calc/login/ajaxjs.php

+<?php
+  $from_value = $_POST['from_value'];
+  $from_unit = $_POST['from_unit'];
+  $to_unit = $_POST['to_unit'];
+  if (is_numeric(($from_unit))){
+      echo "Must be a digit";
+  };
+
+?>

calc/login/login.php

@@ -69,7 +69,6 @@ function protect($string){
         var username = $("#username").val();
         var email = $("#email").val();
         var password = $("#password").val();
-        var continue = $("#continue").val();
         if (email.length == 0 || password.length == 0 || username.length == 0)
           alert('Please check input');
         else{