How to check blank white space in JQuery example?

In this article, I will show you to check blank white space using trim in jQuery example. You can check the user input blank white space in a client side click.

JQuery example:

<script type="text/javascript" src="//code.jquery.com/jquery-1.10.2.js"></script>
    <script type="text/javascript">
        $(document).ready(function () {
            $('#btnSubmit').click(function () {
               if ($.trim($('#txtName').val()) == '')
                    alert('input is blank');
            });
        });
    </script>
  <input type="text" id="txtName" placeholder="please entername" />
            <input id="btnSubmit" type="submit" value="Submit" />

Output: