Turn off Automatic Filtering and Boosting with InstantSearch.js

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// connectAutoFiltering.ts
import type { Connector } from 'instantsearch.js';

export type AutoFilteringConnectorParams = {};

export type AutoFilteringRenderState = {
  appliedFilters: Array<{
    name: string;
    value: string;
  }>;
  cancelAutoFiltering(): void;
};

export type AutoFilteringWidgetDescription = {
  $$type: 'algolia.beta.autoFiltering';
  renderState: AutoFilteringRenderState;
  indexRenderState: {};
  indexUiState: {};
};

type AutoFilteringConnector = Connector<
  AutoFilteringWidgetDescription,
  AutoFilteringConnectorParams
>;

type ConnectorState = {
  disabledQuery?: string;
  cancelAutoFiltering?: AutoFilteringRenderState['cancelAutoFiltering'];
};

// util function to set the query parameter (step 2)
function setAutoFiltering(value, helper) {
  return helper.setQueryParameter('extensions', {
    queryCategorization: {
      enableAutoFiltering: value,
    },
  });
}

type WidgetRenderStateWithResultsExtensions = Parameters<
  ReturnType<ReturnType<AutoFilteringConnector>>['getWidgetRenderState']
>[0] & {
  state: {
    extensions?: {
      queryCategorization?: {
        enableAutoFiltering?: boolean;
      };
    };
  };
  results: {
    extensions?: {
      queryCategorization?: {
        normalizedQuery?: string;
        autofiltering?: {
          facetFilters?: string[];
        };
      };
    };
  };
};

export const connectAutoFiltering: AutoFilteringConnector = (
  renderFn,
  unmountFn = () => {}
) => {
  return function autoFiltering(widgetParams) {
    const connectorState: ConnectorState = {};
    return {
      $$type: 'algolia.beta.autoFiltering',

      init(initOptions) {
        const { instantSearchInstance } = initOptions;

        renderFn(
          {
            ...this.getWidgetRenderState(initOptions),
            instantSearchInstance,
          },
          true
        );
      },

      render(renderOptions) {
        const { instantSearchInstance } = renderOptions;

        renderFn(
          {
            ...this.getWidgetRenderState(renderOptions),
            instantSearchInstance,
          },
          false
        );
      },

      dispose() {
        unmountFn();
      },

      getWidgetUiState(uiState) {
        return uiState;
      },

      getWidgetSearchParameters(searchParameters) {
        return setAutoFiltering(true, searchParameters);
      },

      getRenderState(renderState, renderOptions) {
        return {
          ...renderState,
          autoFiltering: this.getWidgetRenderState(renderOptions),
        };
      },

      // this is where the logic happens
      getWidgetRenderState({
        results,
        helper,
        state,
      }: WidgetRenderStateWithResultsExtensions) {
        if (!connectorState.cancelAutoFiltering) {
          connectorState.cancelAutoFiltering = () => {
            // Disable auto filtering for next search
            setAutoFiltering(false, helper);
            helper.search();

            // storing in the state the disabled query
            connectorState.disabledQuery = helper.getQuery().query;
          };
        }

        // empty results case
        if (!results) {
          return {
            appliedFilters: [],
            cancelAutoFiltering: () => {},
            widgetParams,
          };
        }

        // enabling back auto filtering if the query has changed (step 3)
        if (
          // "state" stores the current query parameters
          state.extensions?.queryCategorization?.enableAutoFiltering ===
            false &&
          connectorState.disabledQuery &&
          results.query !== connectorState.disabledQuery
        ) {
          setAutoFiltering(true, helper);

          if (results.extensions.queryCategorization.normalizedQuery) {
            // if the current query has predicted categories, we refine the search with autofiltering enabled
            helper.search();
          }
        }

        // Retrieving the applied filters (step 1)
        const facetFilters = results.extensions?.queryCategorization?.autofiltering
    ?.facetFilters || [];

        return {
          appliedFilters:
            facetFilters.map((facetFilter) => ({
              name: facetFilter.split(':')[0],
              value: facetFilter.split(':')[1],
            })),
          cancelAutoFiltering: connectorState.cancelAutoFiltering,
          widgetParams,
        };
      },
    };
  };
};

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// autofiltering.ts
import { connectAutoFiltering } from './connectAutoFiltering';
import type { AutoFilteringRenderState } from './connectAutoFiltering';

type WidgetParams = {
  container: string;
};

export function autoFiltering(widgetParams: WidgetParams) {
  const { container: containerSelector } = widgetParams;

  if (!containerSelector) {
    console.error('The `container` option is required.');
  }

  const container = document.querySelector(containerSelector);

  // the widget render function
  const renderer = (
    renderOptions: AutoFilteringRenderState,
    isFirstRender: boolean
  ) => {
    const { appliedFilters, cancelAutoFiltering } = renderOptions;

    /**
    * Here we choose to display the applied filters in a banner with a button to disable autofiltering
    * We are displaying only the last filter of the hierarchy, but you can chose to display all of them if you want to
    * It is entirely up to you how you choose to render the filters
    */

    container.innerHTML =
      appliedFilters && appliedFilters.length
        ? `
            <div style="border: 1px solid lightgray; border-radius: 4px; margin: 1rem 0; padding: 1rem;">
              <span><strong>Applied filter:</strong></span>
                <span>${appliedFilters.pop().value}</span>
                <button>&times;</button>
              
            </div>
          `
        : '';

    const button = container.querySelector('button');
    if (button) {
      // attaching our cancel function to our button
      button.addEventListener('click', () => {
        cancelAutoFiltering();
      });
    }
  };

  const makeWidget = connectAutoFiltering(renderer, () => {
    container.innerHTML = '';
  });

  return {
    ...makeWidget({}),
    $$widgetType: 'algolia.beta.autoFiltering',
  };
}