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JavaScriptBridge¶
Inherits: Object
Singleton that connects the engine with the browser's JavaScript context in Web export.
Description¶
The JavaScriptBridge singleton is implemented only in the Web 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 JavaScriptBridge singleton is enabled. Official export templates also have the JavaScriptBridge singleton enabled. See Compiling for the Web in the documentation for more information.
Tutorials¶
Methods¶
create_callback ( Callable callable ) |
|
create_object ( String object, ... ) vararg |
|
void |
download_buffer ( PackedByteArray buffer, String name, String mime="application/octet-stream" ) |
eval ( String code, bool use_global_execution_context=false ) |
|
void |
force_fs_sync ( ) |
get_interface ( String interface ) |
|
pwa_needs_update ( ) const |
|
pwa_update ( ) |
Signals¶
pwa_update_available ( )
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 pwa_update to force the update to take place immediately.
Method Descriptions¶
JavaScriptObject create_callback ( Callable callable )
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.
Variant create_object ( String object, ... ) vararg
Creates a new JavaScript object using the new
constructor. The object
must a valid property of the JavaScript window
. See JavaScriptObject for usage.
void download_buffer ( PackedByteArray buffer, String name, 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 provided based on the file name
's extension.
Note: Browsers might block the download if 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.
Variant eval ( String code, 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.
void force_fs_sync ( )
Force synchronization of the persistent file system (when enabled).
Note: This is only useful for modules or extensions that can't use FileAccess to write files.
JavaScriptObject get_interface ( 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 Array argument, which will contain the JavaScript arguments
. See JavaScriptObject for usage.
bool pwa_needs_update ( ) const
Returns true
if a new version of the progressive web app is waiting to be activated.
Note: Only relevant when exported as a Progressive Web App.
Error pwa_update ( )
Performs the live update of the progressive web app. Forcing the new version to be installed and the page to be reloaded.
Note: Your application will be reloaded in all browser tabs.
Note: Only relevant when exported as a Progressive Web App and pwa_needs_update returns true
.