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More Riot -> Element

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Travis Ralston 2020-07-15 18:27:17 -06:00
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docs/reference/element_widget_api.md
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# Riot's Widget API
# Element's Widget API
Widgets and Riot communicate using cross-origin messages in a defined format (described in this document). Widgets have access to the entire Scalar Client API, but generally do not need any of the endpoints there. Riot provides additional APIs available to particular widgets for which the integrations manager can not access. The full source for the widget messaging layer in Riot can be seen [here](https://github.com/matrix-org/matrix-react-sdk/blob/develop/src/WidgetMessaging.js). The API is restricted to ensure rogue widgets cannot take over the Riot instance.
Widgets and Element communicate using cross-origin messages in a defined format (described in this document). Widgets have access to the entire Scalar Client API, but generally do not need any of the endpoints there. Element provides additional APIs available to particular widgets for which the integrations manager can not access. The full source for the widget messaging layer in Element can be seen [here](https://github.com/matrix-org/matrix-react-sdk/blob/develop/src/WidgetMessaging.js). The API is restricted to ensure rogue widgets cannot take over the Element instance.
**Note**: This is largely out of date and better documented in the Matrix spec nowadays. See https://github.com/matrix-org/matrix-doc/issues/1236 for more information.
## Setting up communications
Riot will automatically open a channel for receiving messages. The widget needs to do the same so it can speak to Riot. Here's some sample JavaScript that will do this for us:
Element will automatically open a channel for receiving messages. The widget needs to do the same so it can speak to Element. Here's some sample JavaScript that will do this for us:
```
window.addEventListener("message", function(event) {
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function sendMessage(action, widgetId, otherFields) {
if (!otherFields) otherFields = {};
var request = otherFields;
request["widgetId"] = widgetId;
request["action"] = action;
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### Versions / Changelog
All versions use a semantic versioning scheme. The actions recorded in this document include which version they were implemented in. The changelog here is for convience.
All versions use a semantic versioning scheme. The actions recorded in this document include which version they were implemented in. The changelog here is for convience.
**v0.0.1**
* Initial release