![]() You can send the following types of data from Python to the frontend:Īny JSON-serializable data gets serialized to a JSON string, and deserialized to its JavaScript equivalent. You send data from Python to the frontend by passing keyword args to your Component's invoke function (that is, the function returned from declare_component). The theme object has the following shape: Template) or (when using the plain TypeScript template). This object is sent in the same message asĪrgs, so it can be accessed via (when using the React It informs Streamlit when its height may have changed via tFrameHeight()Ĭustom component theme support requires streamlit-component-lib version 1.2.0 or higher.Īlong with sending an args object to your component, Streamlit also sendsĪ theme object defining the active theme so that your component can adjust.It sends data back to the Python script in the same way that the React template does-clicking on the "Click Me!" button calls tComponentValue().Within its onRender event handler, it accesses the arguments passed in the Python script via.(This event won't be fired until setComponentReady is called) It subscribes to Streamlit.RENDER_EVENT to be notified of when to redraw.(You'll generally want to do this after creating and loading everything that the Component relies on.) Towards the bottom of the source file, the template calls tComponentReady() to tell Streamlit it's ready to start receiving data.The React version of the template handles most of these details automatically. This template has much more code than its React sibling, in that all the mechanics of handshaking, setting up event listeners, and updating the component's frame height are done manually. The TypeScript-only template is in template-reactless/my_component/frontend/src/M圜omponent.tsx. There's a tiny bit of magic in the last line of the file: export default withStreamlitConnection(M圜omponent) - this does some handshaking with Streamlit, and sets up the mechanisms for bi-directional data communication. ![]() You can override this behavior if you need more control. ![]() By default, the React template calls this automatically (see ponentDidUpdate()).
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