Untitled

Delay ajax request by x seconds and update only the last clicked request
$('.links li a').click(function(event){
    event.preventDefault();
    var getUrl = $(this).attr("href");
    var printCall = function() {
      $.ajax({
        url: getUrl,
        type: "GET",
        beforeSend: function() {  },
        error: function(request){ alert(request) },
        success: function(data) { $('#graphContent').html(data); }
      });
    };
    setTimeout(printCall, 3000);
  });

<ul>
<li><a href="http://localhost/test.php">Link 1</a></li>
<li><a href="http://localhost">Link 2</a></li>
<li><a href="index.html">Link 3</a></li>
</ul>

// A tracker object outside the scope of all click functions
var pendingCall = { timeStamp: null, procID: null };

$('.links li a').click(function (e) {
    e.preventDefault();
    var getUrl = $(this).attr("href");

    // A timestamp for this call
    var timeStamp = Date.now();

    var printCall = function () {
        $.ajax({
            url: getUrl,
            type: "GET",
            beforeSend: function () { },
            error: function (request) { alert(request) },
            success: function (data) {
                // Short-circuit execution if the timestamp on this call doesn't match the last one made
                if (pendingCall.timeStamp != timeStamp) { return false; }

                // The action to take
                $('#graphContent').html(data);

                // Clear the reference to this timeout call
                pendingCall.procID = null;
            }
        });
    };

    // Clear the timeout on the last call made if it exists
    if (pendingCall.procID) {
        clearTimeout(pendingCall.procID)
    };

    // Update the timeout call tracker
    pendingCall = { timeStamp: timeStamp, procID: setTimeout(printCall, 3000) };
});