distant void
so i am facing a issue where i want to render message first than the generative ui so just to check i have added await and as per ss i am getting the text message first but once everything is done the generative is getting rendered first can you help me how to handle it?
@grim hatch
<@&1229452952104603650> <@&1229450878860394556>
grim hatch
Hey Kratos, there's a couple ways this can be done.
Have you looked at the State Machine docs?
https://docs.copilotkit.ai/cookbook/state-machine?undefined=Build+Car+Stage
distant void
@grim hatch kind of confused like in this there are only frontend steps but how to connect with backend
foggy gate
Hello @distant void , here’s why you’re seeing the generative UI (agent state render) appear before the message:
How CopilotKit Renders Messages and Generative UI
Text messages (from the assistant or user) are rendered by the RenderTextMessage component.
Agent state/generative UI is rendered by the RenderAgentStateMessage component, which is triggered by special agent state messages in the message list.
The chat UI (CopilotChat) renders all messages in order, using the Messages component, which iterates through the message list and picks the appropriate render component for each message (RenderTextMessage, RenderAgentStateMessage, etc.)
Why the Generative UI Appears First
When you append a message (e.g., "Let's continue with your booking."), it is added to the message list.
If the agent state changes (e.g., a new step in the booking process), a new agent state message is also added to the message list.
Both messages are present in the message list, but their order depends on how and when you append them to the state.
The UI renders the entire message list in order. If the agent state message is appended after the text message, but both are rendered in the same render cycle, React may batch the updates and render both together, making it appear that the generative UI comes first (especially if the generative UI is visually more prominent).
Why await/sleep Doesn’t Guarantee Visual Order
await and sleep only delay the code execution, not the React render cycle.
If you append both the text message and the agent state update before the next render, React will render both at once, and their visual order will depend on their order in the message list.
If you want the text message to appear first, then the generative UI after a delay, you need to:
Append the text message.
Wait for a render cycle (e.g., using a state update or a microtask).
Then append the agent state message.
How to Fix
You need to ensure that the text message is rendered and visible before you append the agent state (generative UI) message.
This usually means splitting your logic into two steps, separated by a render cycle. For example:
await copilotkit_emit_message(config, "Let's continue with your booking.");
state["messages"].append(AIMessage(content="Let's continue with your booking."));
// Wait for the UI to render the new message
await new Promise(resolve => setTimeout(resolve, 100)); // or use a state update + useEffect in React```
```// Step 2: Now update the agent state (which will trigger the generative UI)
state["previous_frontend_step"] = "next_step"; // or whatever triggers the generative UI
// (React will now render the generative UI after the text message)
In summary:
The order in which you append messages and state updates to your state array determines their render order.
await/sleep only delays execution, not rendering.
To guarantee the text message appears first, append it, let React render, then append the agent state/generative UI.
Hope this helps. Let us know if you need more clarification
distant void
@foggy gate await new Promise(resolve => setTimeout(resolve, 100)); // or use a state update + useEffect in React so basically this promise needs to be kept in useeffect hook which will trigger once state is updated
right?
foggy gate
Yes. In React, we can use a state update and then a useEffect hook that runs after the state update to cause a render.
For example:
This ensures the text message is rendered first, then after React completes the render cycle, the generative UI updates.
Here is a simplified React example pattern:
function BookingComponent() {
//SAMPLE CODE
useEffect(() => {
if (messageAppended) {
// Now trigger the generative UI update
setShowGenerativeUI(true);
}
}, [messageAppended]);
return (
<div>
<button onClick={appendMessage}>Start Booking</button>
{messages.map((msg, idx) => <div key={idx}>{msg.content}</div>)}
{showGenerativeUI && <div>/* Generative UI goes here */</div>}
</div>
);
}```
This pattern replaces await new Promise(resolve => setTimeout(resolve, 100)); with a React state-driven render cycle.const appendMessage = async () => {
await copilotkit_emit_message(config, "Let's continue with your booking.");
setState((prev) => ({
...prev,
messages: [...prev.messages, { content: "Let's continue with your booking." }],
}));
setMessageAppended(true); // Trigger useEffect after render
}; this is for backend code? @foggy gate if yes we are using seperate python backend
foggy gate
Sorry, my mistake. I've updated the above message. It is just a reference for how to do the rendering in React.
distant void
no still ui i getting rendered first
distant void
@foggy gate i had one more query messages i can only get through state until the langraphs end is there a way to fix it
foggy gate
@distant void I'm currently looking into this and will update you soon. Appreciate your patience!
distant void
@foggy gate anything on it
foggy gate
@distant void Sorry for the delay. I will check this in more detail and give a response soon.
In the meantime, you can try to split the node into 2, so the first one ends by returning a message, and then the 2nd one ends with the next message you want to render. This is a quick workaround you can do until I check this and come back.