Form validation in css not working properly

I created a registration html page in which I am trying to add effects to the textfields on the basis of form validation.

<!DOCTYPE html>
<html>
    <head>
        <link rel="stylesheet" href="css/bootstrap.css">

        <!-- Optional theme -->
        <link rel="stylesheet" href="css/bootstrap-theme.css">

        <script src="js/jquery.js"></script>
        <link href="//netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap-glyphicons.css" rel="stylesheet">
        <!-- Latest compiled and minified JavaScript -->
        <script src="js/bootstrap.js"></script>
        <!-- <script src="js/FormValidation.js"></script> -->
        <script src="https://use.fontawesome.com/b1af24592c.js"></script>
    </head>
    <body>
        <div>
                <div class="col-md-3">
                </div>
                <div class="col-md-6">
                    <div class="panel panel-default">
                        <div class="panel-heading">
                            <h3 style="text-align:center"><a style="text-decoration:none; color:#000000;" href="index.html">Form</a></h3>
                        </div>
                        <div class="panel-body">
                            <form>
                                <div class="form-group has-feedback has-warning">
                                    <label>First Name</label>
                                    <input type="text" placeholder="Your first name" class="form-control" id="firstName" required>
                                    <span class="glyphicon glyphicon-warning-sign form-control-feedback"></span>
                                </div>
                                <div class="form-group has-feedback has-success">
                                    <label>Last Name</label>
                                    <input type="text" placeholder="Your last name" class="form-control" id="lastName" required>
                                    <span class="glyphicon glyphicon-ok form-control-feedback"></span>
                                </div>
                                <div class="form-group">
                                    <label>Email</label>
                                    <input type="text" placeholder="Your email id" class="form-control" id="email" required>
                                </div>
                                <div class="form-group">
                                    <label>Password</label>
                                    <input type="password" placeholder="Password" class="form-control" id="password" required>
                                </div>
                                <div class="form-group">
                                    <label>Confirm Password</label>
                                    <input type="password" placeholder="Confirm your password" class="form-control" id="confirmPassword" required>[![enter image description here][1]][1]
                                </div>
                            </form>
                        </div>
                        <div class="panel-footer">
                            <button class="btn btn-info btn-block">Register</button>
                            <h6>Already a user? <a href="#" data-toggle="modal" data-target="#modal-signin">Sign In</a></h6>
                        </div>
                    </div>
                </div>
        </div>
    </body>
</html>

In the page I want to add glyphicon-ok and glyphicon-warning inside the textbox.

Something like this

But what i am getting is this :

What can be done to resolve this issue?