"disabled java script"
Bootstrap 4.0.0 Snippet by lavan

<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script> <script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script> <!------ Include the above in your HEAD tag ----------> <!DOCTYPE html> <html> <body> <h2>1000</h2> <input type="text" onkeyup="key()" id="1"> <input type="text" onkeyup="key1()" id="2"> <input type="text" id="3"> <script> function key(){ var lav=document.getElementById('1').value; document.getElementById('2').value=1000-Number(lav); if(lav==1000){ document.getElementById('2').disabled=true; } } function key1(){ var lk=document.getElementById('2').value; var lav=document.getElementById('1').value; document.getElementById('3').value=1000-(Number(lav)+Number(lk)); } </script> </body> </html>

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