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FrogUI

Multi-step Cast Actions

Multi-step Cast Actions are similar to Cast Actions with the difference that they display a frame, instead of displaying a message. See the spec.

Overview

At a glance:

  1. User installs Cast Action via specific deeplink or by clicking on <Button.AddCastAction> element with a specified target .castAction route in a Frame.
  2. When the user presses the Cast Action button in the App, the App will make a POST request to the .castAction route.
  3. Server performs any action and returns a response to the App, which is shown as an interactible Frame dialog.

Walkthrough

Here is a trivial example of how to expose a multi-step action with a frame. We will break it down below.

1. Render Frame & Add Action Intent

In the example below, we are rendering an "add cast action" intent.

The action property is used to set the path to the cast action route.

src/index.tsx
app.frame('/', (c) => {
  return c.res({
    image: (
      <div style={{ color: 'white', display: 'flex', fontSize: 60 }}>
        Add "Hello world!" Action
      </div>
    ),
    intents: [
      <Button.AddCastAction action="/hello-world">
        Add
      </Button.AddCastAction>,
    ]
  })
})

2. Handle /hello-world Requests

Next, we will add a route handler to handle the Cast Action request.

The following properties can be used in the handler options object:

  • name: Used to set the name of the action. It must be less than 30 characters
  • icon: Used to associate your Multi-step Cast Action with one of the Octicons. You can see the supported list here.
  • description (optional): Used to describe your action, up to 80 characters.
  • aboutUrl (optional): Used to show an "About" link when installing an action.

Let's define a /hello-world route to handle the Multi-step Cast Action:

src/index.tsx
app.frame('/', (c) => {
  return c.res({
    image: (
      <div style={{ color: 'white', display: 'flex', fontSize: 60 }}>
        Add "Hello world!" Action
      </div>
    ),
    intents: [
      <Button.AddCastAction
        action="/hello-world"
      >
        Add
      </Button.AddCastAction>,
    ]
  })
})
 
app.castAction(
  '/hello-world',
  (c) => {
    console.log(
      `Cast Action to ${JSON.stringify(c.actionData.castId)} from ${
        c.actionData.fid
      }`,
    )
    return c.res({ type: 'frame', path: '/hello-world-frame' })
  },
  { name: "Hello world!", icon: "smiley" }
)

A breakdown of the /hello-world route handler:

  • We are responding with a c.res response and specifying the path for the frame action.

3. Defining a frame handler

We will need to define a frame handler that will handle the request to the action path provided in the previous step:

src/index.tsx
import { Button, Frog, TextInput, parseEther } from 'frog'
import { abi } from './abi'
 
export const app = new Frog()
 
app.frame('/', (c) => {
  return c.res({
    image: (
      <div style={{ color: 'white', display: 'flex', fontSize: 60 }}>
        Add "Hello world!" Action
      </div>
    ),
    intents: [
      <Button.AddCastAction action="/hello-world">
        Add
      </Button.AddCastAction>,
    ]
  })
})
 
app.castAction(
  '/hello-world',
  (c) => {
    return c.res({ type: 'frame', path: '/hello-world-frame' })
  },
  { name: "Hello world!", icon: "smiley" })
)
 
app.frame('/hello-world-frame', (c) => {
  return c.res({
    image: (
      <div style={{ color: 'white', display: 'flex', fontSize: 60 }}>
        Hello world!
      </div>
    )
  })
})

Now we're all set! You can use existing Frame API to connect multiple frames together to have a multi-step experience. See Connecting Frames (Actions).

4. Bonus: Shorthand c.frame

Instead of c.res({ type: 'frame' }), you can use a shorthand c.frame(...).

src/index.tsx
app.castAction(
  '/hello-world',
  (c) => {
    console.log(
      `Cast Action to ${JSON.stringify(c.actionData.castId)} from ${
        c.actionData.fid
      }`,
    ) 
    return c.frame({ path: '/hello-world-frame' })
  }, 
  { name: "Hello world!", icon: "smiley" })
)

4. Bonus: Learn the API

You can learn more about the Cast Action APIs here: