You have built a Voice App and it works well. You needed to use voice to expose data that you already had. It took a few iterations, but now users are happy with it. Your next challenge is needing to having your Voice App get data from the user.

If you are using the Violet framework then collecting data from users should not be hard. If you need an intro to Violet, see the article on Building a Voice App in 30 minutes. We will build on top of that article here.

Getting a Single Input from Users

The easiest way to get input from your users is in getting a single value during a conversation. Lets say that you wanted to allow:

User: What game nights have already been planned for Friday?
App: Let me see.
App: There are no game nights planned for Friday. Would you like to add one?
User: No.

To build this out, we will need to first tell the framework that we need to accept an input of type date. Providing a type allows the underlying system to be smart. In this case, expecting a date allows for inputs to not only accept days of the week, but also commonly used “today”, “tomorrow”, or even “25th November”.

  "plannedDayQuery": "date"

Here, we are calling the parameter plannedDayQuery, and once we have declared it to the framework we can use it anywhere in our conversations.

Building out the above conversation examples gives us the following conversation flow:

<!-- -->
  <expecting>What game nights have already been planned for
  <say>Let me see.</say>
  <resolve value="app.getGameNightsForDate(response)"/>
<!-- -->

With the app logic looking something like:

var app = {
  // ...
  getGameNightsForDate: (response)=>{
    var dateToQuery = response.get('plannedDayQuery');
    // ,,,

Custom Types

Often one of the predefined types do not work for us. In such situations we can define a custom type. For example, if we wanted to only accept a week day, we could do something like:

  "plannedDayQuery": {
    type: "dayOfWeekType",
    values: ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday"]
  // ...

Thinking about Multiple Inputs

We are now able to get a single input from the user. The big challenge in collecting data however if that we often need multiple inputs from the user for a task - you know where we use Form’s in web and mobile apps.

We can definitely do this by having nested decision elements, with each having an ask and one or more expecting elements. However, this does get a little verbose.

In the Voice world, support for these Voice Forms, is provided by what is often referred to as ‘multi-turn conversations’ or ‘dialogs’.

You can do this in Violet by adding a dialog element consisting of multiple item elements. These items are values to be provided by the user. Items are unique in that like decisions they consist of an ask element to prompt the user, but like choices they consist of an expecting element that defines what the user can say. The dialog prompts users based on the items returned by the elicit attribute, and the provided dialog.nextReqdParam() implements requesting all the items that have been tagged as required.

Designing our Voice Form

So lets get back to adding data to our Game Night App. The interaction could go something like:

User: I’m looking to organize a game night for 3 hours on Thursday to play Chess over Dinner. App: Let me see what I can do. App: Great, you are all set.

More realistically, users have a hard time remembering all the details in shot and often give the information one-by-one. We therefore likely want to see something like:

User: I’m looking to organize a game night.
App: What day would you like it to be on?
User: I’d like it to be this Thursday.
App: How long would you like it to be?
User: 3 hours.
App: What would you like the main game to be?
User: Chess.
App: Do you want snacks, lunch, or dinner?
User: Dinner.
App: Let me see what I can do. App: Great, you are all set.

In the above the day, the duration, the game, and the food would be items. Creating a conversation flow from the above, we get:

  <!-- ... -->
  <dialog id="create" elicit="dialog.nextReqdParam()">
      <!-- allow the user to give us all the information -->
      <expecting>I'm looking to organize a game night for [[duration]]
                 hours on [[day]] to play [[game]] over [[food]]
      <!-- setup up a more realistic multi-turn dialog -->
      <expecting>I'm looking to organize a game night</expecting>
      <item name="day" required>
        <ask>What day would you like it to be on?</ask>
        <expecting>I'd like it to be this [[day]]</expecting>
      <item name="duration" required>
        <ask>How long would you like it to be?</ask>
        <expecting>[[duration]] hours</expecting>
      <item name="game" required>
        <ask>What would you like the main game to be</ask>
      <item name="food" required>
        <ask>Do you want snacks, lunch or dinner?</ask>
      <say>Let me see what I can do.</say>
      <resolve value="app.createGameNight(response)">
        <say>Great, you are all set</say>

Now, all we need to do is implement createGameNight. A simple implementation looks like:

// ...
var app = {
  // ...
  createGameNight: (response)=>{
      var dt = calcDateInFuture(response.get('day'),

        startTime: dt,
        duration: parseInt(response.get('duration')),
        game: response.get('game'),
        food: response.get('food')



Hope you found this helpful. I will love to hear (@VineetSinha) what you build and how it goes. Feel free to reach out if you are stuck.

If you are looking for a version of this article for the Salesfore platform - there is trailhead Quick Start on Violet.

See the code for this project here: gameNight.js

Image Credit: Kaufdex from Pixabay.
Updated: 22nd Aug - minor details to align with the Violet 1.0 release.

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