$(document).ajaxStart(function() {
    $('#ajax-spinner').show()
})

$(document).ajaxStop(function() {
    $('#ajax-spinner').hide()
})


function tail_log(url, offset, tailing) {
    var params = {offset: offset}
    $.post(url, params, function(data) {
        logs = $('#log_output')
        if (logs.text().trim() == 'Fetching log...') {
            logs.html('')
        }
        if (data.lines.length > 0) {
            logs.html(logs.html() + data.lines.join(""))
            if (tailing) {
                //logs.animate({scrollTop: logs.attr("scrollHeight")}, 10)
            }
        }
        if (tailing || data.lines.length > 0) {
            setTimeout("tail_log('" + url + "', " + data.offset + ", + " + tailing + ")", 5000)
        }
    }, "json")
}