How to display a pop up notification to the user using jquery?

I am developing an application which requires that u开发者_运维知识库ser must be notified about some background events i.e. invitation from other user, reminder time out etc.

Whenever the event occurs the controller will be notified, and a small window should be displayed to the user.

How should I proceed to achieve this. Which technology / tool will help me. I am using jQuery, JSF 2.0 and Spring 3.0.

this will give a notification similar to the stackoverflow

jQuery

$("#notification").fadeIn("slow").append('your message');
$(".dismiss").click(function(){
       $("#notification").fadeOut("slow");
});

HTML

<div id="notification" style="display: none;">
  <span class="dismiss"><a title="dismiss this notification">x</a></span>
</div>

CSS

#notification {
    position:fixed;
    top:0px;
    width:100%;
    z-index:105;
    text-align:center;
    font-weight:normal;
    font-size:14px;
    font-weight:bold;
    color:white;
    background-color:#FF7800;
    padding:5px;
}
#notification span.dismiss {
    border:2px solid #FFF;
    padding:0 5px;
    cursor:pointer;
    float:right;
    margin-right:10px;
}
#notification a {
    color:white;
    text-decoration:none;
    font-weight:bold
}

Also take a look at mplungjan's answer on how to listen to server updates and message load

HTML:

<input type="button" id="pop" value="Submit"/>
<div id="popup">
  <div id="topbar"> TITLE..</div>
  <div id="content">Here is you content...</div>
  <input type="button" id="ok" value="OK"/>
</div>

CSS:

#popup { background:#ccc; -moz-border-radius: 10px; width:300px; height: 200px; padding: 5px; position: absolute; left: 50%; margin-left: -150px; z-index: 500; display:none }
#topbar { background:#ddd; -moz-border-radius: 10px; padding:5px; height:20px; line-height:20px }
#content { padding:5px; -moz-border-radius: 10px; text-align:center }
#ok { position: absolute; left: 140px; top: 180px }

JQUERY:

$(function(){
    $('#pop').click(function(){
        $('#popup').fadeIn().css('top',$(document).height()/2);
    });
    $('#ok').click(function(){
        $('#popup').fadeOut();
    });
});

Using code from @Anu's suggestion - my fiddle, you can simply add a poll

$(document).ready(function() {
  $(".dismiss").click(function(){$("#notification").fadeOut("slow");});

  setInterval(function() {
    $.get("ping.jsp?userid=<%= userID %>",function(message) {
      if (message) $("#notification").fadeIn("slow").html(message);
    });
   ,10000);
})

the message could include a timestamp to see if you had notified earlier instead of sending an empty message if no notificati9on is needed

Alternatives: Long poll or Comet

Jquery ui dialog is what you are looking for. It will come in handy for you. Although there are lots of other plugin available. This is the simplest..