Замечательная статья!! Автору респект!

Кстати, помнится читал о том, что можно посылать запросы и на др. сервера, но не каждый браузер это позволяет... правда это или нет?

естественно, почему бы и нет

краткость сестра толанта, данный случай к коду.

Контроль над заголовками далеко не полный. Попробуйте кроссбраузерно передать рефер.

Подсветка синтаксиса делает зеленым все, что следует за двумя слэшами (//). Поэтому в следующей строке все, что находится правее "http:", отображается зеленым цветом:
function getUrl(http://javascript.ru/forum/url, cb) {

Здравствуйте Илья Кантор. Хотел спросить на данный момент все браузеры (IE7, 8 FF2, 3, Opera 9, 10) сами автоматически удаляют XMLHttpRequest после получения данных с сервера и никакой утечки памяти не происходит?
И еще хотел спросить, не могли бы вы уточнить на счет этого (Можно отсылать документы из браузера в виде файлов, составляя POST-запрос вручную).
Заранее благодарен!

Значит именно таким образом происходит ajax загрузка файлов на сервер? Т.е. путь к файлу считывается с input type="file" и виде заголовка отправляется на сервер?

Привет всем, не подскажите почему в следующем коде не создается экземпляр объекта?

//ссылка на объект XmlHttpRequest
var xmlHttp = createXmlHttpRequestObject();
//создаем экземпляр XmlHttpRequest
function createXmlHttpRequestObject()
{
	//для хранения ссылки на XmlHttpRequest
	var xmlHttp;
	//следующий код работает во всех браузерах
	//кроме IE6 и более ранних версиях
	try //обработка ошибок
	{
		//попытаться создать объект XmlHttpRequest
		xmlHttp = new XmlHttpRequest();
	}
	catch(e)
	{
		//событие происходит если используется IE6 или более раняя версия
		var XmlHttpVersions = new Array("MSXML2.XMLHHTP.6.0",
										"MSXML2.XMLHHTP.5.0",
										"MSXML2.XMLHHTP.4.0",
										"MSXML2.XMLHHTP.3.0",
										"MSXML2.XMLHHTP",
										"Microsoft.XMLHHTP");
		//попоробовать все возможные версии (prog id), пока что то не подойдет =)
        for (var i = 0; i < XmlHttpVersions.length && !xmlHttp; i++)
        {
        	try
        	{
          		xmlHttp = new ActiveXObject(XmlHttpVersions[i]);
        	}
        	catch(e){}
        }
	}
	if (!xmlHttp)
	{
  		alert("Ошибка создания объекта XmlHttpRequest");
	}
	else return xmlHttp;
}

Все примеры только на стороне клиента, а как на сервере принимать данные, в какую переменную записывается отправляемое сообщение. В $_GET ?

Я только начинающий web-программист, и мне многое не понятно в этой статье
Например: для чего нужен метод onreadystatechange, тут этого не объяснено;
Как работают методы setRequestHeader() getResponseHeader() getAllResponseHeaders()
Все таки надо понимать что на ваш сайт будут залазить совсем новички, чтобы пополнять свои знания, поэтому нужно более подробно пояснять методы объектов

Дааа. Тут каждый регистр важен...

заметил такую бредятину(? может, это и к лучшему): у XMLHttpRequest существует что-то вроде "блек-листа" для заголовков. Делая запрос на пхп-шник:

<?php
//... <- setting up headers :D
print_r($_SERVER);
?>

обнаружил что Accept-Charset и еще некоторые заголовки игнорируются при отправке из жабы...
P.S. Народ будьте аккуратнее при веб-серфе в рунете, быдлокодеры совсем офигели - tsr.boot virus словил вчера даже не понял как... но выкурить проблемы не было, ибо это быдлокодеры...

Больше примеров, пожалуйста! Что изменится, если сделать запрос методом POST? Как сформировать отправляемые данные, например, из ? Как и куда поступают отправленные данные?

Через XMLHTTPREQUEST можно залить файл на сервер.
Нет ну серьёзно:D скора на хабре постну

Не подскажете какой-нибудь способ обойти политику безопасности?

Автору +5!Прочитал курс новых и старых статей, обычно для изучения технология надо знать английский язык, а здесь читаю все на русском, кратко, внятно и главное ДОСТУПНО!!!Теперь буду более правильно делать свои скрипты.

onreadystatechange это же свойство а не метод? Или я не прав?

Столкнулся с одной проблемой, буду благодарен за дельный совет.
Использую функцию $.ajax для отправки запросов и в определенной ситуации нужно оборвать соединение через abort(). Это благополучно и делаю, но к сожалению abort() тригерит error(). Этому как раз и пытаюсь отучить.

Пробовал вот так:

$.ajax({
   error: function( jqXHR, textStatus, errorThrown )
   {
       if( jqXHR == 'abort' ) 
       {
           return;
       }
       else
       {
           // show user friendly error message
       }
   }
});

К сожалению эта проверка по какой-то причине не всегда срабатывает.

Можно спросить? В getXmlHttp() мы сначала пытаемся поднять ActiveXObject "Msxml2.XMLHTTP", потом "Microsoft.XMLHTTP" и лишь когда не получается - стандартно вызываем XMLHttpRequest(). Это отражает некий табель о рагах?
(я привык видеть XMLHttpRequest на первом месте).

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