gistfile1.txt

// I need to use $progress into a callback like this:

callbacks.update = function(data) {
    if (data.response !== null) {
        if (data.response < 100) {
            $progress.custom.update({
                completed: data.response
            });
            return true;
        } else {
            return false;
        }
    }

    if (data.error !== null) {
        $progress.custom.update({
            completed: 100,
            status: 'error',
            message: data.error.message
        });
    }

    // return false by default to prevent an infinate poll scenario
    return false;
}

// I have a poll function which polls a script until the update callback is satified that it has the information it needs

function poll(s, d, c) {
    if (typeof s === 'undefined' || typeof d === 'undefined' || typeof c === 'undefined') {
        return false;
    }

    if (typeof c.start !== 'undefined') {
        c.start();
        delete c.start;
    }

    $.get(s, d, function(result) {
        var repost = false;
        if (typeof c.update !== 'undefined') {
            repost = c.update(result);
        }

        if (repost === true) {
            setTimeout(function() { poll(s, d, c); }, 1000);
        } else {
            if (typeof c.end !== 'undefined') {
                c.end(result);
            }
        }
    });
}