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:
-
The Qt object: This object is specific to QML, and provides helper methods and properties specific to the QML environment.
-
qsTr(), qsTranslate(), qsTrId(), QT_TR_NOOP(), QT_TRANSLATE_NOOP(), and QT_TRID_NOOP() functions: These functions are specific to QML, and provide translation capabilities to the QML environment.
-
gc() function: This function is specific to QML, and provides a way to manually trigger garbage collection.
-
print() function: This function is specific to QML, and provides a simple way to output information to the console.
-
The console object: This object implements a subset of the FireBug Console API.
-
XMLHttpRequest, DOMException: These objects implement a subset of the W3C XMLHttpRequest specification.
The globalObject() function cannot be used to modify the global object of a QQmlEngine. For more information about this, see JavaScript Environment Restrictions.
XMLHttpRequest▲
The XMLHttpRequest object, which can be used to asynchronously obtain data from over a network.
The XMLHttpRequest API implements the same W3C standard as many popular web browsers with following exceptions:
-
QML's XMLHttpRequest does not enforce the same origin policy.
Additionally, the responseXML XML DOM tree currently supported by QML is a reduced subset of the DOM Level 3 Core API supported in a web browser. The following objects and properties are supported by the QML implementation:
|
Node |
Document |
Element |
Attr |
CharacterData |
Text |
|---|---|---|---|---|---|
|
|
|
|
|
|
The XMLHttpRequest example demonstrates how to use the XMLHttpRequest object to make a request and read the response headers.