<?xml version="1.0" encoding="UTF-8" ?> <class name="JavaScript" inherits="Object" version="4.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd"> <brief_description> Singleton that connects the engine with the browser's JavaScript context in HTML5 export. </brief_description> <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. [b]Note:[/b] 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 [url=$DOCS_URL/development/compiling/compiling_for_web.html]Compiling for the Web[/url] in the documentation for more information. </description> <tutorials> <link title="Exporting for the Web: Calling JavaScript from script">$DOCS_URL/tutorials/export/exporting_for_web.html#calling-javascript-from-script</link> </tutorials> <methods> <method name="create_callback"> <return type="JavaScriptObject" /> <argument index="0" name="callable" type="Callable" /> <description> Creates a reference to a [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 [JavaScriptObject] for usage. </description> </method> <method name="create_object" qualifiers="vararg"> <return type="Variant" /> <argument index="0" name="object" type="String" /> <description> Creates a new JavaScript object using the [code]new[/code] constructor. The [code]object[/code] must a valid property of the JavaScript [code]window[/code]. See [JavaScriptObject] for usage. </description> </method> <method name="download_buffer"> <return type="void" /> <argument index="0" name="buffer" type="PackedByteArray" /> <argument index="1" name="name" type="String" /> <argument index="2" name="mime" type="String" default=""application/octet-stream"" /> <description> Prompts the user to download a file containing the specified [code]buffer[/code]. The file will have the given [code]name[/code] and [code]mime[/code] type. [b]Note:[/b] The browser may override the [url=https://en.wikipedia.org/wiki/Media_type]MIME type[/url] provided based on the file [code]name[/code]'s extension. [b]Note:[/b] Browsers might block the download if [method download_buffer] is not being called from a user interaction (e.g. button click). [b]Note:[/b] Browsers might ask the user for permission or block the download if multiple download requests are made in a quick succession. </description> </method> <method name="eval"> <return type="Variant" /> <argument index="0" name="code" type="String" /> <argument index="1" name="use_global_execution_context" type="bool" default="false" /> <description> Execute the string [code]code[/code] as JavaScript code within the browser window. This is a call to the actual global JavaScript function [code]eval()[/code]. If [code]use_global_execution_context[/code] is [code]true[/code], 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. </description> </method> <method name="get_interface"> <return type="JavaScriptObject" /> <argument index="0" name="interface" type="String" /> <description> Returns an interface to a JavaScript object that can be used by scripts. The [code]interface[/code] must be a valid property of the JavaScript [code]window[/code]. The callback must accept a single [Array] argument, which will contain the JavaScript [code]arguments[/code]. See [JavaScriptObject] for usage. </description> </method> <method name="pwa_needs_update" qualifiers="const"> <return type="bool" /> <description> Returns [code]true[/code] if a new version of the progressive web app is waiting to be activated. [b]Note:[/b] Only relevant when exported as a Progressive Web App. </description> </method> <method name="pwa_update"> <return type="int" enum="Error" /> <description> Performs the live update of the progressive web app. Forcing the new version to be installed and the page to be reloaded. [b]Note:[/b] Your application will be [b]reloaded in all browser tabs[/b]. [b]Note:[/b] Only relevant when exported as a Progressive Web App and [method pwa_needs_update] returns [code]true[/code]. </description> </method> </methods> <signals> <signal name="pwa_update_available"> <description> Emitted when an update for this progressive web app has been detected but is waiting to be activated because a previous version is active. See [method pwa_update] to force the update to take place immediately. </description> </signal> </signals> </class>