<html>
  <body>
    <div class="container">
      <div class="row">
        <div class="col-md-6 col-md-offset-3">
          <h1>Registration Form</h1>
          <hr />
            <form action="#" name="regForm" id="regForm">
              <div class="form-group">
              <label>Name: </label>
                <input type="text"                           class="form-control"
                id="name"
                 placeholder="Name"/>
                <p id="p1"></p>
              </div>
              <div class="form-group">
              <label>Email: </label>
                <input type="email"                           class="form-control"
                id="email"
                placeholder="Email"/>
                <p id="p2"></p>
              </div>
              <div class="form-group">
              <label>Password: </label>
                <input type="password"                           class="form-control"
                id="password"
                placeholder="Password"/>
                <p id="p3"></p>
              </div>
              <div class="form-group">
                <input type="submit"                           class="btn btn-primary btn-block"
                id="submit"/>
              </div>
          </form>
        </div>
      </div>
    </div>
  </body>
</html>
#p1, #p2, #p3
{
  color: #FF0000;
}
$(document).ready(function() {
  $("#submit").click(function() {
    var name = $("#name").val();
    var email = $("#email").val();
    var pass = $("#password").val();
    
    if(name.length == "")
      {
        $("#p1").text("Please enter your              name");
        $("#name").focus();
        return false;
      }
    else if(email.length == "")
      {
        $("#p2").text("Please enter your              email address");
        $("#email").focus();
        return false;
      }
    else if(pass.length == "")
      {
        $("#p3").text("Please enter your              password");
        $("#Password").focus();
        return false;
      }
    else
      {
        var con = confirm("Are you done?");
        if(con == true)
          {
            alert("Welcome to our website");
            return true;
          }
        else
          {
            return false;
          }
      }
  });
  
});

External CSS

  1. https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/css/bootstrap.min.css

External JavaScript

  1. https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.0/jquery.min.js