/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:FDL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia.  For licensing terms and
** conditions see http://qt.digia.com/licensing.  For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Free Documentation License Usage
** Alternatively, this file may be used under the terms of the GNU Free
** Documentation License version 1.3 as published by the Free Software
** Foundation and appearing in the file included in the packaging of
** this file.  Please review the following information to ensure
** the GNU Free Documentation License version 1.3 requirements
** will be met: http://www.gnu.org/copyleft/fdl.html.
** $QT_END_LICENSE$
**
****************************************************************************/
/*!
\page qtqml-javascript-qmlglobalobject.html
\title QML Global Object
\brief Description of the Qml Global Object


The QML JavaScript host environment implements the following host objects and functions.
These are built in and can be used from any JavaScript code loaded in QML, without
additional imports:

\list
\li The \l{QmlGlobalQtObject}{Qt object}: This object is specific to QML, and provides helper methods
    and properties specific to the QML environment.
\li qsTr(), qsTranslate(), qsTrId(), QT_TR_NOOP(), QT_TRANSLATE_NOOP(), and QT_TRID_NOOP() functions:
    These functions are specific to QML, and provide \l{Overview of the Translation Process}{translation capabilities} to the QML environment.
\li gc() function: This function is specific to QML, and provides a way to manually trigger garbage collection.
\li print() function: This function is specific to QML, and provides a simple way to output information to the console.
\li The \l{Console API}{console object}: This object implements a subset of the \l{http://getfirebug.com/wiki/index.php/Console_API}{FireBug Console API}.
\li \l{XMLHttpRequest}, DOMException: These objects implement a subset of the \l{http://www.w3.org/TR/XMLHttpRequest/}{W3C XMLHttpRequest specification}.
\endlist



\section1 XMLHttpRequest
\target XMLHttpRequest

The XMLHttpRequest object, which can be used to asynchronously obtain
data from over a network.

The XMLHttpRequest API implements the same \l {http://www.w3.org/TR/XMLHttpRequest/}{W3C standard}
as many popular web browsers with following exceptions:
\list
\li QML's XMLHttpRequest does not enforce the same origin policy.
\li QML's XMLHttpRequest does not support \e synchronous requests.
\endlist

Additionally, the \c responseXML XML DOM tree currently supported by QML is a reduced subset
of the \l {http://www.w3.org/TR/DOM-Level-3-Core/}{DOM Level 3 Core} API supported in a web
browser.  The following objects and properties are supported by the QML implementation:

\table
\header
\li \b {Node}
\li \b {Document}
\li \b {Element}
\li \b {Attr}
\li \b {CharacterData}
\li \b {Text}

\row
\li
\list
\li nodeName
\li nodeValue
\li nodeType
\li parentNode
\li childNodes
\li firstChild
\li lastChild
\li previousSibling
\li nextSibling
\li attributes
\endlist

\li
\list
\li xmlVersion
\li xmlEncoding
\li xmlStandalone
\li documentElement
\endlist

\li
\list
\li tagName
\endlist

\li
\list
\li name
\li value
\li ownerElement
\endlist

\li
\list
\li data
\li length
\endlist

\li
\list
\li isElementContentWhitespace
\li wholeText
\endlist

\endtable

The \l{qml/xmlhttprequest}{XMLHttpRequest example} demonstrates how to
use the XMLHttpRequest object to make a request and read the response headers.

*/
