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.

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.
• QML's XMLHttpRequest does not support synchronous requests.

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:

The XMLHttpRequest example demonstrates how to use the XMLHttpRequest object to make a request and read the response headers.