Display Text From Textbox on Enter Key Press

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.