title: How to calculate sum using javascript
body: <p>I have two inputs from textboxes.and i want to display sum of those two values in another textbox.this is how i did it.but when i entered 2and 3 it display 23 in 3rd text box.i want to display 5 on 3rd text box.what is the wrong and how can solve it?</p>
  
  <pre><code>    var sale=document.getElementById("sale").value;  // enter 2
  
      var sale2=document.getElementById("sale2").value; // enter 3
  
  
      document.getElementById('calsale').value = ((sale2)+(sale)); //now display23.want  to display 5
  </code></pre>