How to read the ul id?

I am having <ul class= "list" id = "List">

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I want to read the ul id

$("li:last-child input:button").live('click', function () { var val = $(this).closest('ul').val(); alert(val); });

How can I do that? In the above the alert is not displaying the id.

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val() returns an input's value. You want the ID attribute:

$("li:last-child input:button").live("click", function() {
  var id = $(this).closest("ul").attr("id");
  alert(id);
});

You can use attr() on a jQuery object or id on a DOM element object to get the ID.

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You can do this:

  $("li:last-child input:button").live('click', function () { 
        var val =  $(this).closest('ul').attr('id'); 
        alert(val); 
  });