CategoryFieldSuggestions

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Developer

Example Implementation

category-suggestions.fn.tsx

import {CategoryFieldSuggestions as HeadlessCategoryFieldSuggestions} from '@coveo/headless';
import {useEffect, useState, FunctionComponent} from 'react';
 
interface CategoryFieldSuggestionsProps {
  controller: HeadlessCategoryFieldSuggestions;
}
 
export const CategoryFieldSuggestions: FunctionComponent<
  CategoryFieldSuggestionsProps
> = (props) => {
  const {controller} = props;
  const [state, setState] = useState(controller.state);
 
  useEffect(() => controller.subscribe(() => setState(controller.state)), []);
 
  const onInput = (text: string) => {
    if (text === '') {
      controller.clear();
      return;
    }
    controller.updateText(text);
  };
 
  return (
    <div>
      <input onInput={(e) => onInput(e.currentTarget.value)} />
      <ul>
        {state.values.map((facetSearchValue) => (
          <li
            key={[...facetSearchValue.path, facetSearchValue.rawValue].join(
              '>'
            )}
            onClick={() => controller.select(facetSearchValue)}
          >
            {[...facetSearchValue.path, facetSearchValue.displayValue].join(
              ' > '
            )}{' '}
            ({facetSearchValue.count} results)
          </li>
        ))}
      </ul>
    </div>
  );
};
 
// usage
 
/**
 * ```tsx
 * const facetOptions: CategoryFacetOptions = {field: 'geographicalhierarchy'}
 * const options: CategoryFieldSuggestionsOptions = {facet: facetOptions};
 * const controller = buildCategoryFieldSuggestions(engine, {options});
 *
 * <CategoryFieldSuggestions controller={controller} />;
 * ```
 */

The CategoryFieldSuggestions controller provides query suggestions based on a particular category facet field.

For example, you could use this controller to provide auto-completion suggestions while the end user is typing an item category.

This controller is a wrapper around the basic category facet controller search functionality, and thus exposes similar options and properties.

Methods

clear

Resets the query and empties the suggestions.

search

Requests field suggestions based on a query.

select

Filters the search using the specified value.

If a facet exists with the configured facetId, selects the corresponding facet value.

Parameters

showMoreResults

Shows more field suggestions for the current query.

updateCaptions

Updates the captions of field suggestions.

Parameters

  • captions: Record<string, string>

    A dictionary that maps field values to field suggestion display names.

updateText

Requests field suggestions based on a query.

Parameters

  • text: string

    The query with which to request field suggestions.

subscribe

Adds a callback that’s invoked on state change.

Parameters

  • listener: () => void

    A callback that’s invoked on state change.

Returns Unsubscribe: A function to remove the listener.

Attributes

state

Properties

  • isLoading: boolean

    Whether the request for field suggestions is in progress.

  • moreValuesAvailable: boolean

    Whether more field suggestions are available.

  • query: string

    The query used to request field suggestions.

  • values: CategoryFieldSuggestionsValue[]

    The field suggestions.

Initialize

buildCategoryFieldSuggestions

Creates a CategoryFieldSuggestions controller instance.

This controller initializes a category facet under the hood, but exposes state and methods that are relevant for suggesting field values based on a query. It’s important not to initialize a category facet with the same facetId but different options, because only the options of the controller which is built first will be taken into account.

Parameters

  • engine: SearchEngine

    The headless engine.

  • props: CategoryFieldSuggestionsProps

    The configurable CategoryFieldSuggestions controller properties.

Returns CategoryFieldSuggestions

CategoryFieldSuggestionsProps

The configurable CategoryFieldSuggestions controller properties.

Properties

CategoryFieldSuggestionsOptions

The options for the CategoryFieldSuggestions controller.

Properties

  • facet: CategoryFacetOptions

    The options used to register the category facet used under the hood by the field suggestions controller.

CategoryFacetOptions

Properties

  • field: string

    The field whose values you want to display in the facet.

  • basePath?: string[]

    The base path shared by all values for the facet.

    Default: []

  • delimitingCharacter?: string

    The character that specifies the hierarchical dependency.

    Default: ;

  • facetId?: string

    A unique identifier for the controller. By default, a random unique ID is generated.

  • facetSearch?: CategoryFacetSearchOptions

    Facet search options.

  • filterByBasePath?: boolean

    Whether to filter the results using basePath.

    Default: true

  • filterFacetCount?: boolean

    Whether to exclude the parents of folded results when estimating the result count for each facet value.

    Default: true

  • injectionDepth?: number

    The maximum number of results to scan in the index to ensure that the facet lists all of the potential facet values.

    Note: A high injectionDepth may reduce facet request performance.

    Minimum: 0

    Default: 1000

  • numberOfValues?: number

    The number of values to request for this facet. This option also determines the number of additional values to request each time this facet is expanded, as well as the number of values to display when this facet is collapsed.

    Minimum: 1

    Default: 5

  • sortCriteria?: 'alphanumeric' | 'occurrences'

    The criterion to use for sorting returned facet values.

    Default: occurrences

CategoryFacetSearchOptions

Properties

  • captions?: Record<string, string>

    A dictionary that maps index field values to facet value display names.

  • numberOfValues?: number

    The maximum number of values to fetch.

    Default: 10

  • query?: string

    The string to match.

CategoryFieldSuggestionsValue

Properties

  • count: number

    An estimated number of result items matching both the current query and the filter expression that would get generated if this field suggestion was selected.

  • displayValue: string

    The custom field suggestion display name, as specified in the captions argument of the FieldSuggestion controller.

  • path: string[]

    The hierarchical path to the value.

  • rawValue: string

    The original field value, as retrieved from the field in the index.

Unsubscribe

Call signatures

  • (): void;