abv/static/scripts/poller.js

function poll() {
    var xmlhttp = new XMLHttpRequest();
    xmlhttp.onreadystatechange = function() {
        if (xmlhttp.readyState == XMLHttpRequest.DONE) {
           if (xmlhttp.status == 200) {
               update(xmlhttp.responseText);
           }
        }
    };

    // Send the request
    xmlhttp.open("GET", "/graph", true);
    xmlhttp.send();
};


function update(s) {
    json = JSON.parse(s);
    graph.update(json);
}

// Launch the polling loop
setInterval(poll, 1000);