[ticket/14492] Send statistics via ajax request

Flooding ajax requests will try to be prevented and sending
stats without JS will also properly work.

PHPBB3-14492

phpBB/adm/style/ajax.js

@@ -4,6 +4,101 @@
 
 'use strict';
 
+
+phpbb.prepareSendStats = function () {
+	var $form = $('#acp_help_phpbb');
+	var $dark = $('#darkenwrapper');
+	var $loadingIndicator;
+
+	$form.on('submit', function () {
+		var $this = $(this),
+			currentTime = Math.floor(new Date().getTime() / 1000),
+			statsTime = parseInt($this.find('input[name=help_send_statistics_time]').val(), 10);
+
+		event.preventDefault();
+		$this.unbind('submit');
+
+		// Skip ajax request if form is submitted too early or send stats
+		// checkbox is not checked
+		if (!$this.find('input[name=help_send_statistics]').is(':checked') ||
+			statsTime > currentTime) {
+			$form.find('input[type=submit]').click();
+			setTimeout(function () {
+				$form.find('input[type=submit]').click();
+			}, 300);
+			return;
+		}
+
+		/**
+		 * Handler for AJAX errors
+		 */
+		function errorHandler(jqXHR, textStatus, errorThrown) {
+			if (typeof console !== 'undefined' && console.log) {
+				console.log('AJAX error. status: ' + textStatus + ', message: ' + errorThrown);
+			}
+			phpbb.clearLoadingTimeout();
+			var errorText = '';
+
+			if (typeof errorThrown === 'string' && errorThrown.length > 0) {
+				errorText = errorThrown;
+			} else {
+				errorText = $dark.attr('data-ajax-error-text-' + textStatus);
+				if (typeof errorText !== 'string' || !errorText.length) {
+					errorText = $dark.attr('data-ajax-error-text');
+				}
+			}
+			phpbb.alert($dark.attr('data-ajax-error-title'), errorText);
+		}
+
+		/**
+		 * This is a private function used to handle the callbacks, refreshes
+		 * and alert. It calls the callback, refreshes the page if necessary, and
+		 * displays an alert to the user and removes it after an amount of time.
+		 *
+		 * It cannot be called from outside this function, and is purely here to
+		 * avoid repetition of code.
+		 *
+		 * @param {object} res The object sent back by the server.
+		 */
+		function returnHandler(res) {
+			phpbb.clearLoadingTimeout();
+
+			// If a confirmation is not required, display an alert and call the
+			// callbacks.
+			$dark.fadeOut(phpbb.alertTime);
+
+			if ($loadingIndicator) {
+				$loadingIndicator.fadeOut(phpbb.alertTime);
+			}
+
+			var $sendStatisticsSuccess = $('<input />', {
+				type: 'hidden',
+				name: 'send_statistics_response',
+				value: res
+			});
+			$sendStatisticsSuccess.appendTo('p.submit-buttons');
+
+			// Finish actual form submission
+			$form.find('input[type=submit]').click();
+		}
+
+		$loadingIndicator = phpbb.loadingIndicator();
+
+		$.ajax({
+			url: $this.attr('data-ajax-action').replace('&amp;', '&'),
+			type: 'POST',
+			data: 'systemdata=' + $this.find('input[name=systemdata]').val(),
+			success: returnHandler,
+			error: errorHandler,
+			cache: false
+		}).always(function() {
+			if ($loadingIndicator && $loadingIndicator.is(':visible')) {
+				$loadingIndicator.fadeOut(phpbb.alertTime);
+			}
+		});
+	});
+};
+
 /**
  * The following callbacks are for reording items. row_down
  * is triggered when an item is moved down, and row_up is triggered when
@@ -225,6 +320,10 @@ $(function() {
 			$(this).attr('data-clicked', true);
 		});
 	}
+
+	if ($('#acp_help_phpbb')) {
+		phpbb.prepareSendStats();
+	}
 });