JavaScript: What would cause setInterval to stop firing?
- by Rosarch
I am writing a chat AJAX app. Randomly, in FF 3.5.9, setInterval() seems to stop firing. I don't have clearInterval() anywhere in my code. What could be causing this to happen?
$(document).ready(function () {
$("#no-js-warning").empty();
messageRefresher = new MessageRefresher(0);
setInterval($.proxy(messageRefresher, "refresh"), 2000);
});
function notifyInRoom(user) {
$.getJSON('API/users_in_room', { room_id: $.getUrlVar('key'), username: user }, function (users) {
if (!$.isEmptyObject(users)) {
$("#users").empty();
$.each(users, function (index, username) {
var newChild = sprintf("<li>%s</li>", username);
$("#users").append(newChild);
});
}
else {
$("#users-loading-msg").text("No one is in this room.");
}
});
}
function MessageRefresher(latest_mid) {
this._latest_mid = latest_mid;
}
MessageRefresher.prototype.refresh = function () {
notifyInRoom($("#user-name").val());
var refresher = this;
$.getJSON('API/read_messages', { room_id: $.getUrlVar('key'), mid: refresher._latest_mid }, function (messages) {
if (! (messages == null || $.isEmptyObject(messages[0]))) { // messages will always be at least [[], [], 0]
$("#messages-loading-msg").hide();
for (var i = 0; i < messages[0].length; i++) {
var newChild = sprintf('<li><span class="username">%s:</span> %s</li>', messages[1][i], messages[0][i]);
$("#messages").append(newChild);
}
refresher._latest_mid = messages[2];
setUserBlockClass();
}
else {
$("#messages-loading-msg").text("No messages here. Say anything...");
}
});
}
// Give the end-user-block class to the appropriate messages
// eg, those where the next message is by a different user
function setUserBlockClass() {
$("#messages li").each(function (index) {
if ($(this).children(".username").text() != $(this).next().children(".username").text()) {
$(this).addClass("end-user-block");
}
});
}
I checked the most recent responses in Firebug, and it was the same responses that had been sent earlier. (So, it's not like an unusual response caused a crash.)
If I refresh the page, the calls resume.
