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.. DO NOT EDIT THIS FILE, but the JavaScript.xml source instead.
.. The source is found in doc/classes or modules/<name>/doc_classes.

.. _class_JavaScript:

JavaScript
==========

**Inherits:** :ref:`Object<class_Object>`

Singleton that connects the engine with the browser's JavaScript context in HTML5 export.

Description
-----------

The JavaScript singleton is implemented only in the HTML5 export. It's used to access the browser's JavaScript context. This allows interaction with embedding pages or calling third-party JavaScript APIs.

**Note:** This singleton can be disabled at build-time to improve security. By default, the JavaScript singleton is enabled. Official export templates also have the JavaScript singleton enabled. See :doc:`Compiling for the Web <../development/compiling/compiling_for_web>` in the documentation for more information.

Tutorials
---------

- `Exporting for the Web: Calling JavaScript from script <../tutorials/export/exporting_for_web.html#calling-javascript-from-script>`__

Methods
-------

+-------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`JavaScriptObject<class_JavaScriptObject>` | :ref:`create_callback<class_JavaScript_method_create_callback>` **(** :ref:`Callable<class_Callable>` callable **)**                                                                                                            |
+-------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`Variant<class_Variant>`                   | :ref:`create_object<class_JavaScript_method_create_object>` **(** :ref:`String<class_String>` object, ... **)** |vararg|                                                                                                        |
+-------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| void                                            | :ref:`download_buffer<class_JavaScript_method_download_buffer>` **(** :ref:`PackedByteArray<class_PackedByteArray>` buffer, :ref:`String<class_String>` name, :ref:`String<class_String>` mime="application/octet-stream" **)** |
+-------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`Variant<class_Variant>`                   | :ref:`eval<class_JavaScript_method_eval>` **(** :ref:`String<class_String>` code, :ref:`bool<class_bool>` use_global_execution_context=false **)**                                                                              |
+-------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`JavaScriptObject<class_JavaScriptObject>` | :ref:`get_interface<class_JavaScript_method_get_interface>` **(** :ref:`String<class_String>` interface **)**                                                                                                                   |
+-------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

Method Descriptions
-------------------

.. _class_JavaScript_method_create_callback:

- :ref:`JavaScriptObject<class_JavaScriptObject>` **create_callback** **(** :ref:`Callable<class_Callable>` callable **)**

Creates a reference to a :ref:`Callable<class_Callable>` that can be used as a callback by JavaScript. The reference must be kept until the callback happens, or it won't be called at all. See :ref:`JavaScriptObject<class_JavaScriptObject>` for usage.

----

.. _class_JavaScript_method_create_object:

- :ref:`Variant<class_Variant>` **create_object** **(** :ref:`String<class_String>` object, ... **)** |vararg|

Creates a new JavaScript object using the ``new`` constructor. The ``object`` must a valid property of the JavaScript ``window``. See :ref:`JavaScriptObject<class_JavaScriptObject>` for usage.

----

.. _class_JavaScript_method_download_buffer:

- void **download_buffer** **(** :ref:`PackedByteArray<class_PackedByteArray>` buffer, :ref:`String<class_String>` name, :ref:`String<class_String>` mime="application/octet-stream" **)**

Prompts the user to download a file containing the specified ``buffer``. The file will have the given ``name`` and ``mime`` type.

**Note:** The browser may override the `MIME type <https://en.wikipedia.org/wiki/Media_type>`__ provided based on the file ``name``'s extension.

**Note:** Browsers might block the download if :ref:`download_buffer<class_JavaScript_method_download_buffer>` is not being called from a user interaction (e.g. button click).

**Note:** Browsers might ask the user for permission or block the download if multiple download requests are made in a quick succession.

----

.. _class_JavaScript_method_eval:

- :ref:`Variant<class_Variant>` **eval** **(** :ref:`String<class_String>` code, :ref:`bool<class_bool>` use_global_execution_context=false **)**

Execute the string ``code`` as JavaScript code within the browser window. This is a call to the actual global JavaScript function ``eval()``.

If ``use_global_execution_context`` is ``true``, the code will be evaluated in the global execution context. Otherwise, it is evaluated in the execution context of a function within the engine's runtime environment.

----

.. _class_JavaScript_method_get_interface:

- :ref:`JavaScriptObject<class_JavaScriptObject>` **get_interface** **(** :ref:`String<class_String>` interface **)**

Returns an interface to a JavaScript object that can be used by scripts. The ``interface`` must be a valid property of the JavaScript ``window``. The callback must accept a single :ref:`Array<class_Array>` argument, which will contain the JavaScript ``arguments``. See :ref:`JavaScriptObject<class_JavaScriptObject>` for usage.

.. |virtual| replace:: :abbr:`virtual (This method should typically be overridden by the user to have any effect.)`
.. |const| replace:: :abbr:`const (This method has no side effects. It doesn't modify any of the instance's member variables.)`
.. |vararg| replace:: :abbr:`vararg (This method accepts any number of arguments after the ones described here.)`
.. |constructor| replace:: :abbr:`constructor (This method is used to construct a type.)`
.. |static| replace:: :abbr:`static (This method doesn't need an instance to be called, so it can be called directly using the class name.)`
.. |operator| replace:: :abbr:`operator (This method describes a valid operator to use with this type as left-hand operand.)`