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Create a webpage to talk to your Assistant using the Voiceflow Dialog API

What you need

To start with this project, you will need your Voiceflow assistant Dialog API key as this key is needed each time you want to make a request to the /interact endpoint.

Loom Video

Project Structure

  • index.html: This file contains the main structure of the webpage, including loading the Google Fonts, the main scripts.js file and the siriwave library. This is also where we are setting the data-version attribute we then use in our Dialog API request header to interact with the chosen version of our assistant.

  • styles.css: This file contains the styles for the webpage, such as animations for fading in and out, and other visual elements. You can customize this file to match your own design preferences.

  • scripts.js: This file contains the JavaScript code for handling the interaction with the Voiceflow Dialog API, set a random image to use it as a background, and rendering the responses on the webpage. This is also in this file that we set the Dialog API key.

  • siriwave.umd.min.js: This file contains the JavaScript code for generating the wave animation when we play audio. GitHub - kopiro/siriwave: The Apple® Siri wave-form replicated in a JS library.

  • /images: Directory with all the images for the background.

Dialog API Usage in script.js

The main function for interacting with the Voiceflow Dialog API is the interact() function in the scripts.js file. This function sends a POST request to the Dialog API with the necessary headers, including the Version ID and API key. It also includes a config object in the body of the request to configure certain aspects of the interaction, such as enabling Text-to-Speech (TTS) and removing SSML tags.

The response from the Dialog API is then processed by the displayResponse() function, which iterates through the items in the response and renders them on the webpage. This includes handling speak steps with text and audio, text steps, and visual steps with images.

To ensure that the audio plays at the correct time and does not overlap with other audio, a queue is used to manage the playback of audio files.

Conclusion

This simple example demonstrates how to integrate your Voiceflow assistant with the Dialog API in a webpage chat assistant.

Happy building!