jQuery Delegate fails to run ajax

Here is my jQuery using delegate and ajax:

$(".tweets").delegate("#fav #submit", "click", function(){
    var favid = $("#fav input#favid").val();
    var favsave = 'favid=' + favid;
    alert(favsave);
    $.ajax({
      type: "POST",
      url: "fav.php",
      data: favsave,
      success: function() {
        $('#fav').fadeOut(100);
      }
    });
    return false;

}); 

The HTML:开发者_如何转开发

   <div class='tweets'>
    <ul class='entries'>
      <li>
        <form id='fav' method='post' class='favo' action=''>
          <input style='display: none;' type='text' name='fav' id='fav' value='".$row["tweetid"]."' />
          <input type='submit' value='Add to Favorites' name='submit' id='submit' />
        </form>"
      </li>
    </ul>
   </div>

There is another set of Ajax on the page that is constantly adding to the .entries list, these records that get appended pickup the click function, so that when I click on them the Alerts are shown but the Ajax part of the function doesnt work.

Any ideas? Would .live be better?

"doesn't work" is not the best of all descriptions.

Anyway, it makes no sense to use "absolute" selectors within an delegated event.
By querying $("#fav input#favid").val(); you would get results from all elements with that id you would only get the first match (since ids are assumed to be unique) (which would be unfortunate just because of multiple id tags)

You should grab the target property from the event object to identify the elements which should get involved.

Example:

$(".tweets").delegate("#submit", "click", function(event){
    var $self   = $(event.target);
    var favid   = $self.siblings('#fav');
    var favsave = 'favid=' + favid;

    $.ajax({
          type: "POST",
          url: "fav.php",
          data: favsave,
          success: function() {
                $self.closests('#fav').fadeOut(100);
          }
    });
    return false;
}); 

It's probably not a good idea to have IDs for elements which are created dynamically.
As mentioned, it's no valid HTML markup to have multiple ID tags. Should be classes I guess.