Modules

Class List

A list presents users with a vertical list of multiple items and allows them to select one by touch or voice input. When a user selects an item from the list, Assistant generates a user query (chat bubble) containing the title of the list item.

Lists are good for when it's important to disambiguate options, or when the user needs to choose between options that need to be scanned in their entirety. For example, which "Peter" do you need to speak to, Peter Jons or Peter Hans?

Lists must contain a minimum of 2 and a maximum of 30 list items. The number of elements initially displayed depends on the user's device, and common starting number is 10 items.

example

const ASSISTANT_LOGO_IMAGE = new Image({
  url: 'https://developers.google.com/assistant/assistant_96.png',
  alt: 'Google Assistant logo'
});

app.handle('List', conv => {
  conv.add('This is a list.');

  // Override type based on slot 'prompt_option'
  conv.session.typeOverrides = [{
    name: 'prompt_option',
    mode: 'TYPE_REPLACE',
    synonym: {
      entries: [
        {
          name: 'ITEM_1',
          synonyms: ['Item 1', 'First item'],
          display: {
             title: 'Item #1',
             description: 'Description of Item #1',
             image: ASSISTANT_LOGO_IMAGE,
                }
        },
        {
          name: 'ITEM_2',
          synonyms: ['Item 2', 'Second item'],
          display: {
             title: 'Item #2',
             description: 'Description of Item #2',
             image: ASSISTANT_LOGO_IMAGE,
                }
        },
        {
          name: 'ITEM_3',
          synonyms: ['Item 3', 'Third item'],
          display: {
             title: 'Item #3',
             description: 'Description of Item #3',
             image: ASSISTANT_LOGO_IMAGE,
                }
        },
        {
          name: 'ITEM_4',
          synonyms: ['Item 4', 'Fourth item'],
          display: {
             title: 'Item #4',
             description: 'Description of Item #4',
             image: ASSISTANT_LOGO_IMAGE,
                }
        },
        ]
    }
  }];

  // Define prompt content using keys
  conv.add(new List({
    title: 'List title',
    subtitle: 'List subtitle',
    items: [
      {
        key: 'ITEM_1'
      },
      {
        key: 'ITEM_2'
      },
      {
        key: 'ITEM_3'
      },
      {
        key: 'ITEM_4'
      }
    ],
  }));
});

see

Developer Documentation

Hierarchy

List

Implements

List

Properties

items

items: ListItem[]

min: 2 max: 30

subtitle

subtitle: string

Subtitle of the list. Optional.

title

title: string

Overall title of the list. Optional.