javascript - Html Input=text performs postback when enter is pressed -

i using signalr make chat , works when enters text , presses return performs postback , previous chat lost , no message sent. primary goal avoid performing postback ideally call send button click event.

i have tried make javascript function on keypressed should cancel postback did not change anything. have tried change asp:textbox autopostback attribute set false.

my current code:

<div class="container">     <input type="text" id="message" />     <input type="button" id="sendmessage" value="send"/>     <ul id="discussion">     </ul> </div> <script src="scripts/jquery-1.6.4.min.js" ></script> <script src="scripts/jquery.signalr-2.0.2.min.js"></script> <script src="signalr/hubs"></script> <script type="text/javascript">     $(function () {         // declare proxy reference hub.          var chat = $.connection.chathub;         // create function hub can call broadcast messages.         chat.client.broadcastmessage = function (time, name, message) {         // html encode display time, name, , message.          var encodedtime = $('<div />').text(time).html();         var encodedname = $('<div />').text(name).html();         var encodedmsg = $('<div />').text(message).html();         // add message page.          $('#discussion').append('<li>[' + encodedtime +'] ' + encodedname             + ': ' + encodedmsg + '</li>');         };         // set initial focus message input box.           $('#message').focus();         // start connection.         $.connection.hub.start().done(function () {             $('#sendmessage').click(function () {                 // call send method on hub.                  chat.server.send($('#message').val());                 // clear text box , reset focus next comment.                  $('#message').val('').focus();             });         });     }); </script> 

it appears html wrapped <form>. should able prevent postbacks adding following js:

$('form').submit(function(event) {     event.preventdefault(); }); 

you might want make selector more specific of course.