Question

I try to hide the text with a button click, not sure how it is done:..

<script type="text/javascript">
   $('.HideButton').click(
      function () {
         $('#disclaimer').hide();
      }
   );
</script>

The body:

<p id="disclaimer" > DDDDDDDDDDDDDDDDDDDDDDDDDD</p>
<asp:Button ID="Button1" CssClass="HideButton"  runat="server" Text="Hide" />

Answer 1

You need to wrap it in the ready handler, but apart from that it should work:

$(function() {
    $('.HideButton').click(function () {
        $('#disclaimer').hide();
    }); 
});

(demo – slighty changed in order to overcome ASP dependency.) Do note, that the button may have other side-effects, too, cf. @Zootius’ answer.