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Jul 22nd, 2017
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  1. <script type="text/javascript">
  2.     function subtractValues(inpt1, inpt2)
  3.     {
  4.         var txt_one = document.getElementById('text1').value;
  5.         var txt_two = document.getElementById('text2').value;
  6.        
  7.         if(txt_one == ""){txt_one = 0;}
  8.         else{ txt_one = parseFloat(txt_one); }
  9.        
  10.         if(txt_two == ""){txt_two = 0;}
  11.         else{ txt_two = parseFloat(txt_two); }
  12.        
  13.         var result = txt_one - txt_two;
  14.  
  15.         return document.getElementById('text3').value = result;
  16.     }                                                          
  17. </script>
  18.  
  19. <form id="form1" name="form1" method="post" action="">
  20.   <p>&nbsp;</p>
  21.   <p>&nbsp;</p>
  22.   <p>&nbsp;</p>
  23.   <p>&nbsp;</p>
  24.   <p>
  25.     <label>Text1
  26.     <input name="text1" type="text" id="text1" value='50' onkeyup="Javascript: subtractValues('text1', 'text2');"/>
  27.     </label>
  28.   </p>
  29.   <p>
  30.     <label>Text2
  31.     <input name="text2" type="text" id="text2" value='0' onkeyup="Javascript: subtractValues('text1', 'text2');"/>
  32.     </label>
  33.   </p>
  34.   <p>
  35.     <label>Text3
  36.     <input name="text3" type="text" id="text3" value="" />
  37.     </label>
  38.   </p>
  39.   <p>&nbsp;</p>
  40.   <p>&nbsp;</p>
  41.   <p>&nbsp;</p>
  42.   <p>&nbsp;</p>
  43.   <p>&nbsp;</p>
  44.   <p>&nbsp;</p>
  45. </form>
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