Get text from textbox on enter key press using jQuery.

1. Add Jquery on page.

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.2/jquery.min.js"></script>

2. Add HTML textarea.
    <textarea id="txtcomment" placeholder="Type your comment here and press Enter Key...."></textarea>

3. add script after text area.
 <script type="text/javascript">
 $('#txtcomment').keypress(function (event) {

                var keycode = (event.keyCode ? event.keyCode : event.which);
                if (keycode == '13') {
                    alert($('#txtcomment').val());
                    savecomment($('#hdnBlogid').val(), $('#txtcomment').val());
                }
                event.stopPropagation();
            });

   </script>
4. run the html page and type in textbox when you press enter that time you can see one alert box with textbox value.