title: how to send javascript dynamic data to php variable without ajax
body: <p>I have a form, with the 3 input type text.</p>
  
  <pre><code>&lt;input type="text" id="one" onkeyup="multiply()" name="one"&gt;
  &lt;input type="text" id="two" name="two"&gt;
  &lt;input type="text" id="three" name="three"&gt;
  
  &lt;script&gt;
  function multiply(){
      one = document.getElementById('one').value;
      two = document.getElementById('two').value;
      document.getElementById('three').value = one * two
  }
  &lt;/script&gt;
  </code></pre>
  
  <p>now i don't have value in three, but it is a dynamic one, when i submit forum to (forumSubmit.php)then i get error of </p>
  
  <pre><code>undefiend index three
  </code></pre>
  
  <p>I searched &amp; found this can be done with ajax, but i don't want to use ajax, i want to make a page refresh</p>