// Copyright (C) 2017 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only
/*!
\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

\note The \l {QJSEngine::}{globalObject()} function cannot be used to modify
the global object of a \l QQmlEngine. For more information about this, see
\l {JavaScript Environment Restrictions}.

\target XMLHttpRequest
\section1 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.
\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{Qt Quick Examples - XMLHttpRequest}{XMLHttpRequest example} demonstrates
how to use the XMLHttpRequest object to make a request and read the response
headers.

*/
