JSFiddle - React, Tailwind, and code Playground

HTML

<input type="checkbox" id="cpassword_lf" />
<input type="password" id="password_loginform_hidden" />
<input type="text" id="password_loginform_clear" />

JavaScript

$(function ()
{
    $('#password_loginform_clear').hide();
    $('#cpassword_lf').change(function()
    {
         if(!$('#cpassword_lf').is(':checked'))
         {
             $('#password_loginform_clear').hide();
             $('#password_loginform_hidden').show();
             
             $('#password_loginform_hidden').val($('#password_loginform_clear').val());
             $('#password_loginform_clear').val('');
         }
         else
         {
             $('#password_loginform_clear').show();
             $('#password_loginform_hidden').hide();
             
             $('#password_loginform_clear').val($('#password_loginform_hidden').val());
             $('#password_loginform_hidden').val('');
         }  
    });
});