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<!DOCTYPE html> <html> <body> <form> Username: <input type="text" id="usrname"><br> Password: <input type="password" id="myPsw"> </form><br> <button onclick="disablePsw()">Disable Password field</button> <button onclick="undisablePsw()">Undisable Password field</button> <script> function disablePsw() { document.getElementById("myPsw").disabled = true; } function undisablePsw() { document.getElementById("myPsw").disabled = false; } </script> </body> </html>