Edit in JSFiddle

// Visualize: Listen for change page totals  (5.6)

visualize({
    auth: {
        name: "superuser",
        password: "superuser"
    }
}, function (v) {
    var report = v.report({ 
        resource: "/public/Samples/Reports/AllAccounts", 
        container: "#container", 
        error: function(error) {
            alert(error);  
        },
        events: {
            changeTotalPages: function(totalPages) {
                alert("Total Pages:" + totalPages);
            }
        }
    });
});

<!-- Visualize: Listen for change page totals  (5.6)
  -->

<script type='text/javascript' src="http://code.jquery.com/jquery-2.1.0.js"></script>
<script type='text/javascript' src="http://underscorejs.org/underscore-min.js"></script>
<script type='text/javascript' src="http://localhost:8080/jasperserver-pro/client/visualize.js"></script>

<div id="container"></div>