var subscribe_data = JSON.parse(document.getElementById('subscribe_data').innerHTML); var subscribe_button = document.getElementById('subscribe'); subscribe_button.parentNode['action'] = 'javascript:void(0)'; if (subscribe_button.getAttribute('data-type') === 'subscribe') { subscribe_button.onclick = subscribe; } else { subscribe_button.onclick = unsubscribe; } function subscribe(retries = 5) { if (retries <= 0) { console.log('Failed to subscribe.'); return; } var url = '/subscription_ajax?action_create_subscription_to_channel=1&redirect=false' + '&c=' + subscribe_data.ucid; var xhr = new XMLHttpRequest(); xhr.responseType = 'json'; xhr.timeout = 10000; xhr.open('POST', url, true); xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded'); var fallback = subscribe_button.innerHTML; subscribe_button.onclick = unsubscribe; subscribe_button.innerHTML = '<b>' + subscribe_data.unsubscribe_text + ' | ' + subscribe_data.sub_count_text + '</b>'; xhr.onreadystatechange = function () { if (xhr.readyState == 4) { if (xhr.status != 200) { subscribe_button.onclick = subscribe; subscribe_button.innerHTML = fallback; } } } xhr.onerror = function () { console.log('Subscribing failed... ' + retries + '/5'); setTimeout(function () { subscribe(retries - 1) }, 1000); } xhr.ontimeout = function () { console.log('Subscribing failed... ' + retries + '/5'); subscribe(retries - 1); } xhr.send('csrf_token=' + subscribe_data.csrf_token); } function unsubscribe(retries = 5) { if (retries <= 0) { console.log('Failed to subscribe'); return; } var url = '/subscription_ajax?action_remove_subscriptions=1&redirect=false' + '&c=' + subscribe_data.ucid; var xhr = new XMLHttpRequest(); xhr.responseType = 'json'; xhr.timeout = 10000; xhr.open('POST', url, true); xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded'); var fallback = subscribe_button.innerHTML; subscribe_button.onclick = subscribe; subscribe_button.innerHTML = '<b>' + subscribe_data.subscribe_text + ' | ' + subscribe_data.sub_count_text + '</b>'; xhr.onreadystatechange = function () { if (xhr.readyState == 4) { if (xhr.status != 200) { subscribe_button.onclick = unsubscribe; subscribe_button.innerHTML = fallback; } } } xhr.onerror = function () { console.log('Unsubscribing failed... ' + retries + '/5'); setTimeout(function () { unsubscribe(retries - 1) }, 1000); } xhr.ontimeout = function () { console.log('Unsubscribing failed... ' + retries + '/5'); unsubscribe(retries - 1); } xhr.send('csrf_token=' + subscribe_data.csrf_token); }