var slidy_irc = { shown: [], pin_regex: /^\d{4}$/, start: function () { w3c_slidy.add_observer(function(number, title, url) { var pin = document.getElementById('slidy_pin'); if (pin.value && slidy_irc.pin_regex.test(pin.value) && slidy_irc.unposted(number)) { slidy_irc.post("https://www.w3.org/Talks/Tools/slidy-irc.php?" + "pin=" + escape(pin.value) + "&slide=" + number + "&title=" + escape(title) + "&uri=" + escape(url)); slidy_irc.shown.push(number); } }); var pin = document.getElementById('slidy_pin'); pin.addEventListener('change', function () { if (slidy_irc.pin_regex.test(pin.value)) { w3c_slidy.notify_observers(); pin.blur(); } else alert("The PIN should be a 4 digit number"); }, false); }, post: function (url) { var req = new XMLHttpRequest(); req.open("POST", url, true); req.send(); }, unposted: function (number) { return this.shown.indexOf(number) < 0; } } window.addEventListener("load", function() { slidy_irc.start(); }, false); document.write('

Presenter PIN:

');