API Reference / InstantSearch.js / hierarchicalMenu

hierarchicalMenu

Signature 
instantsearch.widgets.hierarchicalMenu({
  container: string|HTMLElement,
  attributes: string[],
  // Optional parameters
  limit: number,
  showMore: boolean,
  showMoreLimit: number,
  separator: string,
  rootPath: string,
  showParentLevel: boolean,
  sortBy: string[]|function,
  templates: object,
  cssClasses: object,
  transformItems: function,
});
See code examples
See live example

About this widget #

The hierarchicalMenu widget is used to create a navigation based on a hierarchy of facet attributes. It is commonly used for categories with subcategories.

Requirements#

The objects to use in the hierarchical menu must follow this structure:

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[
  {
    "objectID": "321432",
    "name": "lemon",
    "categories.lvl0": "products",
    "categories.lvl1": "products > fruits"
  },
  {
    "objectID": "8976987",
    "name": "orange",
    "categories.lvl0": "products",
    "categories.lvl1": "products > fruits"
  }
]

It’s also possible to provide more than one path for each level:

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[
  {
    "objectID": "321432",
    "name": "lemon",
    "categories.lvl0": ["products", "goods"],
    "categories.lvl1": ["products > fruits", "goods > to eat"]
  }
]

The attributes provided to the widget must be in attributes for faceting, either on the dashboard or using attributesForFaceting with the API. By default, the separator is > (with spaces) but you can use a different one by using the separator option.

Examples #

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instantsearch.widgets.hierarchicalMenu({
  container: '#hierarchical-menu',
  attributes: [
    'hierarchicalCategories.lvl0',
    'hierarchicalCategories.lvl1',
    'hierarchicalCategories.lvl2',
    'hierarchicalCategories.lvl3',
  ],
});

Options #

container #
type: string|HTMLElement
Required

The CSS Selector or HTMLElement to insert the widget into.
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instantsearch.widgets.hierarchicalMenu({
  // ...
  container: '#hierarchical-menu',
});
attributes #
type: string[]
Required

The name of the attributes to generate the menu with.
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instantsearch.widgets.hierarchicalMenu({
  // ...
  attributes: [
    'hierarchicalCategories.lvl0',
    'hierarchicalCategories.lvl1',
    'hierarchicalCategories.lvl2',
    'hierarchicalCategories.lvl3',
  ],
});
limit #
type: number
default: 10
Optional

How many facet values to retrieve. When you enable the showMore feature, this is the number of facet values to display before clicking the “Show more” button.
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instantsearch.widgets.hierarchicalMenu({
  // ...
  limit: 5,
});
showMore #
type: boolean
default: false
Optional

Whether to display a button that expands the number of items.
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instantsearch.widgets.hierarchicalMenu({
  // ...
  showMore: true,
});
showMoreLimit #
type: number
Optional

The maximum number of displayed items (only used when showMore is set to true).
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instantsearch.widgets.hierarchicalMenu({
  // ...
  showMoreLimit: 20,
});
separator #
type: string
default: >
Optional

The level separator used in the records.
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instantsearch.widgets.hierarchicalMenu({
  // ...
  separator: ' / ',
});
rootPath #
type: string
default: null
Optional

The prefix path to use if the first level is not the root level.
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instantsearch.widgets.hierarchicalMenu({
  // ...
  rootPath: 'Computers & Tablets',
});
showParentLevel #
type: boolean
default: true
Optional

Whether to show the siblings of the selected parent level of the current refined value.
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instantsearch.widgets.hierarchicalMenu({
  // ...
  showParentLevel: false,
});
sortBy #
type: string[]|function
default: Uses facetOrdering if set, ["name:asc"]
Optional

How to sort refinements. Must be one or more of the following strings:

  • "count" (same as "count:desc")
  • "count:asc"
  • "count:desc"
  • "name" (same as "name:asc")
  • "name:asc"
  • "name:desc"
  • "isRefined" (same as "isRefined:asc")
  • "isRefined:asc"
  • "isRefined:desc"

It’s also possible to give a function, which receives items two by two, like JavaScript’s Array.sort.
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instantsearch.widgets.hierarchicalMenu({
  // ...
  sortBy: ['isRefined'],
});
templates #
type: object
Optional

The templates to use for the widget.
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instantsearch.widgets.hierarchicalMenu({
  // ...
  templates: {
    // ...
  },
});
cssClasses #
type: object
default: {}
Optional

The CSS classes to override.

  • root: the root element of the widget.
  • noRefinementRoot: the root element if there are no refinements.
  • list: the list of results.
  • childList: the child list element.
  • item: the list items.
  • selectedItem: the selected item of the list.
  • parentItem: the parent item of the list.
  • link: the link of each item.
  • label: the label of each item.
  • count: the count of each item.
  • showMore: the “Show more” button.
  • disabledShowMore: the disabled “Show more” button.
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instantsearch.widgets.hierarchicalMenu({
  // ...
  cssClasses: {
    root: 'MyCustomHierarchicalMenu',
    list: [
      'MyCustomHierarchicalMenuList',
      'MyCustomHierarchicalMenuList--subclass',
    ],
  },
});
transformItems #
type: function
default: items => items
Optional

Receives the items and is called before displaying them. Should return a new array with the same shape as the original array. Useful for transforming, removing, or reordering items.

In addition, the full results data is available, which includes all regular response parameters, as well as parameters from the helper (for example disjunctiveFacetsRefinements).
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instantsearch.widgets.hierarchicalMenu({
  // ...
  transformItems(items) {
    return items.map(item => ({
      ...item,
      label: item.label.toUpperCase(),
    }));
  },
});

/* or, combined with results */
instantsearch.widgets.hierarchicalMenu({
  // ...
  transformItems(items, { results }) {
    return items.map(item => ({
      ...item,
      label: item.isRefined
        ? `${item.label} (page ${results.page + 1}/${results.nbPages})`
        : item.label,
    }));
  },
});

Templates #

item #
type: string|function
Optional

The template for each item. It exposes:

  • label: string: the label of the item.
  • value: string: the value of the item.
  • count: number: the number of results matching the value.
  • isRefined: boolean: whether the item is selected.
  • url: string: the URL with the applied refinement.
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instantsearch.widgets.hierarchicalMenu({
  // ...
  templates: {
    item: `
      <a class="{{cssClasses.link}}" href="{{url}}">
        <span class="{{cssClasses.label}}">{{label}}</span>
        <span class="{{cssClasses.count}}">
          {{#helpers.formatNumber}}{{count}}{{/helpers.formatNumber}}
        </span>
      </a>
    `,
  },
});
showMoreText #
type: string|function
Optional

The template for the “Show more” button text. It exposes:

  • isShowingMore: boolean: whether the list is expanded.
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instantsearch.widgets.hierarchicalMenu({
  // ...
  templates: {
    showMoreText: `
      {{#isShowingMore}}
        Show less
      {{/isShowingMore}}
      {{^isShowingMore}}
        Show more
      {{/isShowingMore}}
    `,
  },
});

HTML output#

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<div class="ais-HierarchicalMenu">
  <ul class="ais-HierarchicalMenu-list ais-HierarchicalMenu-list--lvl0">
    <li class="ais-HierarchicalMenu-item ais-HierarchicalMenu-item--parent ais-HierarchicalMenu-item--selected">
      <a class="ais-HierarchicalMenu-link" href="#">
        <span class="ais-HierarchicalMenu-label">Appliances</span>
        <span class="ais-HierarchicalMenu-count">4,306</span>
      </a>
      <ul class="ais-HierarchicalMenu-list ais-HierarchicalMenu-list--child ais-HierarchicalMenu-list--lvl1">
        <li class="ais-HierarchicalMenu-item ais-HierarchicalMenu-item--parent">
          <a class="ais-HierarchicalMenu-link" href="#">
            <span class="ais-HierarchicalMenu-label">Dishwashers</span>
            <span class="ais-HierarchicalMenu-count">181</span>
          </a>
        </li>
        <li class="ais-HierarchicalMenu-item">
          <a class="ais-HierarchicalMenu-link" href="#">
            <span class="ais-HierarchicalMenu-label">Fans</span>
            <span class="ais-HierarchicalMenu-count">91</span>
          </a>
        </li>
      </ul>
    </li>
    <li class="ais-HierarchicalMenu-item ais-HierarchicalMenu-item--parent">
      <a class="ais-HierarchicalMenu-link" href="#">
        <span class="ais-HierarchicalMenu-label">Audio</span>
        <span class="ais-HierarchicalMenu-count">1,570</span>
      </a>
    </li>
  </ul>
  <button class="ais-HierarchicalMenu-showMore">Show more</button>
</div>

Customize the UI with connectHierarchicalMenu#

If you want to create your own UI of the hierarchicalMenu widget, you can use connectors.

It’s a 3-step process:

// 1. Create a render function
const renderHierarchicalMenu = (renderOptions, isFirstRender) => {
  // Rendering logic
};

// 2. Create the custom widget
const customHierarchicalMenu = instantsearch.connectors.connectHierarchicalMenu(
  renderHierarchicalMenu
);

// 3. Instantiate
search.addWidgets([
  customHierarchicalMenu({
    // instance params
  })
]);

See code examples

Create a render function#

This rendering function is called before the first search (init lifecycle step) and each time results come back from Algolia (render lifecycle step).

const renderHierarchicalMenu = (renderOptions, isFirstRender) => {
  const {
    object[] items,
    boolean isShowingMore,
    boolean canToggleShowMore,
    boolean canRefine,
    function refine,
    function sendEvent,
    function toggleShowMore,
    function createURL,
    object widgetParams,
  } = renderOptions;

  if (isFirstRender) {
    // Do some initial rendering and bind events
  }

  // Render the widget
}

If SEO is critical to your search page, your custom HTML markup needs to be parsable:

  • use plain <a> tags with href attributes for search engines bots to follow them,
  • use semantic markup with structured data when relevant, and test it.

Refer to our SEO checklist for building SEO-ready search experiences.

Rendering options #

items #
type: object[]

The list of available items, with each item:

  • label: string: the label of the item.
  • value: string: the value of the item.
  • count: number: the number results matching this value.
  • isRefined: boolean: whether the item is selected.
  • data: object[]|null: the list of children for the current item.
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const renderList = items => `
  <ul>
    ${items
      .map(
        item => `
          <li>
            <a href="#">${item.label} (${item.count})</a>
            ${item.data ? renderList(item.data) : ''}
          </li>
        `
      )
      .join('')}
  </ul>
`;

const renderHierarchicalMenu = (renderOptions, isFirstRender) => {
  const { items } = renderOptions;

  const children = renderList(items);

  document.querySelector('#hierarchical-menu').innerHTML = children;
};
isShowingMore #
type: boolean

Whether the list is expanded.
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const renderList = items => `
  <ul>
    ${items
      .map(
        item => `
          <li>
            <a href="#">${item.label} (${item.count})</a>
            ${item.data ? renderList(item.data) : ''}
          </li>
        `
      )
      .join('')}
  </ul>
`;

const renderHierarchicalMenu = (renderOptions, isFirstRender) => {
  const { items, isShowingMore } = renderOptions;

  document.querySelector('#hierarchical-menu').innerHTML = `
    ${renderList(items)}
    <button>${isShowingMore ? 'Show less' : 'Show more'}</button>
  `;
};
canToggleShowMore #
type: boolean

Whether the “Show more” button can be clicked.
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const renderList = items => `
  <ul>
    ${items
      .map(
        item => `
          <li>
            <a href="#">${item.label} (${item.count})</a>
            ${item.data ? renderList(item.data) : ''}
          </li>
        `
      )
      .join('')}
  </ul>
`;

const renderHierarchicalMenu = (renderOptions, isFirstRender) => {
  const { items, canToggleShowMore } = renderOptions;

  document.querySelector('#hierarchical-menu').innerHTML = `
    ${renderList(items)}
    <button ${!canToggleShowMore ? 'disabled' : ''}>Show more</button>
  `;
};
canRefine #
type: boolean
Required

Indicates if search state can be refined.
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const renderHierarchicalMenu = (renderOptions, isFirstRender) => {
  const { items, canRefine } = renderOptions;

  if (!canRefine) {
    document.querySelector('#hierarchical-menu').innerHTML = '';
    return;
  }
};
refine #
type: function

Sets the path of the hierarchical filter and triggers a new search.
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const renderList = items => `
  <ul>
    ${items
      .map(
        item => `
          <li>
            <a
              href="#"
              data-value="${item.value}"
              style="font-weight: ${item.isRefined ? 'bold' : ''}"
            >
              ${item.label} (${item.count})
            </a>
            ${item.data ? renderList(item.data) : ''}
          </li>
        `
      )
      .join('')}
  </ul>
`;

const renderHierarchicalMenu = (renderOptions, isFirstRender) => {
  const { items, refine } = renderOptions;

  const container = document.querySelector('#hierarchical-menu');

  container.innerHTML = renderList(items);

  [...container.querySelectorAll('a')].forEach(element => {
    element.addEventListener('click', event => {
      event.preventDefault();
      refine(event.target.dataset.value);
    });
  });
};
sendEvent #
type: (eventType, facetValue) => void

The function to send click events.

  • The view event is automatically sent when the facets are rendered.
  • The click event is automatically sent when refine is called.

  • You can learn more about the insights middleware.

  • eventType: 'click'
  • facetValue: string
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// For example,
sendEvent('click', 'Laptop');

/*
  A payload like the following will be sent to the `insights` middleware.
  {
    eventType: 'click',
    insightsMethod: 'clickedFilters',
    payload: {
      eventName: 'Filter Applied',
      filters: ['category:"Laptop"'],
      index: '<index-name>',
    },
    widgetType: 'ais.hierarchicalMenu',
  }
*/
toggleShowMore #
type: function

Toggles the number of displayed values between limit and showMoreLimit.
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const renderList = items => `
  <ul>
    ${items
      .map(
        item => `
          <li>
            <a href="#">${item.label} (${item.count})</a>
            ${item.data ? renderList(item.data) : ''}
          </li>
        `
      )
      .join('')}
  </ul>
`;

const renderHierarchicalMenu = (renderOptions, isFirstRender) => {
  const { items, isShowingMore, toggleShowMore } = renderOptions;

  const container = document.querySelector('#hierarchical-menu');

  if (isFirstRender) {
    const list = document.createElement('div');
    const button = document.createElement('button');

    button.addEventListener('click', () => {
      toggleShowMore();
    });

    container.appendChild(list);
    container.appendChild(button);
  }

  container.querySelector('div').innerHTML = renderList(items);
  container.querySelector('button').textContent = isShowingMore
    ? 'Show less'
    : 'Show more';
};
createURL #
type: function

Generates a URL for the next state.
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const renderList = ({ items, createURL }) => `
  <ul>
    ${items
      .map(
        item => `
          <li>
            <a href="${createURL(item.value)}">
              ${item.label} (${item.count})
            </a>
            ${item.data ? renderList({ items: item.data, createURL }) : ''}
          </li>
        `
      )
      .join('')}
  </ul>
`;

const renderHierarchicalMenu = (renderOptions, isFirstRender) => {
  const { items, createURL } = renderOptions;

  const children = renderList({ items, createURL });

  document.querySelector('#hierarchical-menu').innerHTML = children;
};
widgetParams #
type: object

All original widget options forwarded to the render function.
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const renderHierarchicalMenu = (renderOptions, isFirstRender) => {
  const { widgetParams } = renderOptions;

  widgetParams.container.innerHTML = '...';
};

// ...

search.addWidgets([
  customHierarchicalMenu({
    // ...
    container: document.querySelector('#hierarchical-menu'),
  })
]);

Create and instantiate the custom widget#

We first create custom widgets from our rendering function, then we instantiate them. When doing that, there are two types of parameters you can give:

  • Instance parameters: they are predefined parameters that you can use to configure the behavior of Algolia.
  • Your own parameters: to make the custom widget generic.

Both instance and custom parameters are available in connector.widgetParams, inside the renderFunction.

const customHierarchicalMenu = instantsearch.connectors.connectHierarchicalMenu(
  renderHierarchicalMenu
);

search.addWidgets([
  customHierarchicalMenu({
    attributes: string[],
    // Optional parameters
    limit: number,
    showMoreLimit: number,
    separator: string,
    rootPath: string,
    showParentLevel: boolean,
    sortBy: string[]|function,
    transformItems: function,
  })
]);

Instance options #

attributes #
type: string[]
Required

The name of the attributes to generate the menu with.
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customHierarchicalMenu({
  attributes: [
    'hierarchicalCategories.lvl0',
    'hierarchicalCategories.lvl1',
    'hierarchicalCategories.lvl2',
    'hierarchicalCategories.lvl3',
  ],
});
limit #
type: number
default: 10
Optional

How many facet values to retrieve. When isShowingMore is false, this is the number of facet values displayed before clicking the “Show more” button.
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customHierarchicalMenu({
  // ...
  limit: 5,
});
showMoreLimit #
type: number
Optional

The maximum number of displayed items (only used when the showMore feature is implemented).
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customHierarchicalMenu({
  // ...
  showMoreLimit: 20,
});
separator #
type: string
default: >
Optional

The level separator used in the records.
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customHierarchicalMenu({
  // ...
  separator: ' / ',
});
rootPath #
type: string
default: null
Optional

The prefix path to use if the first level is not the root level.
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customHierarchicalMenu({
  // ...
  rootPath: 'Computers & Tablets',
});
showParentLevel #
type: boolean
default: true
Optional

Whether to show the siblings of the selected parent level of the current refined value.
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customHierarchicalMenu({
  // ...
  showParentLevel: false,
});
sortBy #
type: string[]|function
default: Uses facetOrdering if set, ["name:asc"]
Optional

How to sort refinements. Must be one or more of the following strings:

  • "count:asc"
  • "count:desc"
  • "name:asc"
  • "name:desc"
  • "isRefined"

It’s also possible to give a function, which receives items two by two, like JavaScript’s Array.sort

If facetOrdering is set for this facet in renderingContent, and no value for sortBy is passed to this widget, facetOrdering is used, and the default order as a fallback.
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customHierarchicalMenu({
  // ...
  sortBy: ['isRefined'],
});
transformItems #
type: function
default: items => items
Optional

Receives the items and is called before displaying them. Should return a new array with the same shape as the original array. Useful for transforming, removing, or reordering items.

In addition, the full results data is available, which includes all regular response parameters, as well as parameters from the helper (for example disjunctiveFacetsRefinements).
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customHierarchicalMenu({
  // ...
  transformItems(items) {
    return items.map(item => ({
      ...item,
      label: item.label.toUpperCase(),
    }));
  },
});

/* or, combined with results */
customHierarchicalMenu({
  // ...
  transformItems(items, { results }) {
    return items.map(item => ({
      ...item,
      label: item.isRefined
        ? `${item.label} (page ${results.page + 1}/${results.nbPages})`
        : item.label,
    }));
  },
});

Full example#

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// Create the render function
const renderList = ({ items, createURL }) => `
  <ul>
    ${items
      .map(
        item => `
          <li>
            <a
              href="${createURL(item.value)}"
              data-value="${item.value}"
              style="font-weight: ${item.isRefined ? 'bold' : ''}"
            >
              ${item.label} (${item.count})
            </a>
            ${item.data ? renderList({ items: item.data, createURL }) : ''}
          </li>
        `
      )
      .join('')}
  </ul>
`;

const renderHierarchicalMenu = (renderOptions, isFirstRender) => {
  const {
    items,
    isShowingMore,
    refine,
    toggleShowMore,
    createURL,
    widgetParams,
  } = renderOptions;

  if (isFirstRender) {
    const list = document.createElement('div');
    const button = document.createElement('button');

    button.addEventListener('click', () => {
      toggleShowMore();
    });

    widgetParams.container.appendChild(list);
    widgetParams.container.appendChild(button);
  }

  const children = renderList({ items, createURL });

  widgetParams.container.querySelector('div').innerHTML = children;
  widgetParams.container.querySelector('button').textContent = isShowingMore
    ? 'Show less'
    : 'Show more';

  [...widgetParams.container.querySelectorAll('a')].forEach(element => {
    element.addEventListener('click', event => {
      event.preventDefault();
      refine(event.target.dataset.value);
    });
  });
};

// Create the custom widget
const customHierarchicalMenu = instantsearch.connectors.connectHierarchicalMenu(
  renderHierarchicalMenu
);

// Instantiate the custom widget
search.addWidgets([
  customHierarchicalMenu({
    container: document.querySelector('#hierarchical-menu'),
    attributes: [
      'hierarchicalCategories.lvl0',
      'hierarchicalCategories.lvl1',
      'hierarchicalCategories.lvl2',
      'hierarchicalCategories.lvl3',
    ],
    limit: 5,
    showMoreLimit: 10,
  })
]);
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InstantSearch.js v4