API Reference / InstantSearch.js Widgets / hitsPerPage
Aug. 23, 2019

hitsPerPage

Widget signature
instantsearch.widgets.hitsPerPage({
  container: string|HTMLElement,
  items: object[],
  // Optional parameters
  cssClasses: object,
  transformItems: function,
});

About this widget

The hitsPerPage widget displays a dropdown menu to let the user change the number of displayed hits.

If you only want to configure the number of hits per page without displaying a widget, you can use the configure widget with the hitsPerPage search parameter.

Examples

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instantsearch.widgets.hitsPerPage({
  container: '#hits-per-page',
  items: [
    { label: '8 hits per page', value: 8, default: true },
    { label: '16 hits per page', value: 16 },
  ],
});

Options

container
type: string|HTMLElement
Required

The CSS Selector or HTMLElement to insert the widget into.

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instantsearch.widgets.hitsPerPage({
  // ...
  container: '#hits-per-page',
});
items
type: object[]
Required

The list of available options, with each item:

  • label: string: the label to display in the option.
  • value: number: the number of hits to display per page.
  • default: boolean: the default hits per page on first search.
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instantsearch.widgets.hitsPerPage({
  // ...
  items: [
    { label: '8 hits per page', value: 8, default: true },
    { label: '16 hits per page', value: 16 },
  ],
});
cssClasses
type: object
default: {}
Optional

The CSS classes to override.

  • root: the root element of the widget.
  • select: the select element.
  • option: the option elements of the select.
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instantsearch.widgets.hitsPerPage({
  // ...
  cssClasses: {
    root: 'MyCustomHitsPerPage',
    select: [
      'MyCustomHitsPerPageSelect',
      'MyCustomHitsPerPageSelect--subclass',
    ],
  },
});
transformItems
type: function
default: x => x
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 mapping over the items to transform, and remove or reorder them.

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instantsearch.widgets.hitsPerPage({
  // ...
  transformItems(items) {
    return items.map(item => ({
      ...item,
      label: item.label.toUpperCase(),
    }));
  },
});

HTML output

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<div class="ais-HitsPerPage">
  <select class="ais-HitsPerPage-select">
    <option class="ais-HitsPerPage-option" value="8">8 per page</option>
    <option class="ais-HitsPerPage-option" value="16">16 per page</option>
  </select>
</div>

Customize the UI - connectHitsPerPage

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

It’s a 3-step process:

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

// 2. Create the custom widget
const customHitsPerPage = instantsearch.connectors.connectHitsPerPage(
  renderHitsPerPage
);

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

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 renderHitsPerPage = (renderOptions, isFirstRender) => {
  const {
    object[] items,
    boolean hasNoResults,
    function refine,
    object widgetParams,
  } = renderOptions;

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

  // Render the widget
}

Rendering options

items
type: object[]

The list of items the widget can display, with each item:

  • label: string: the label to display in the option.
  • value: number: the number of hits to display per page.
  • isRefined: boolean: indicates if the item is the current refined value.
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const renderHitsPerPage = (renderOptions, isFirstRender) => {
  const { items } = renderOptions;

  document.querySelector('#hits-per-page').innerHTML = `
    <select>
      ${items
        .map(
          item => `
            <option
              value="${item.value}"
              ${item.isRefined ? 'selected' : ''}
            >
              ${item.label}
            </option>
          `
        )
        .join('')}
    </select>
  `;
};
hasNoResults
type: boolean

Indicates whether or not the search has results.

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

  document.querySelector('#hits-per-page').innerHTML = `
    <select ${hasNoResults ? 'disabled' : ''}>
      ${items
        .map(
          item => `
            <option
              value="${item.value}"
              ${item.isRefined ? 'selected' : ''}
            >
              ${item.label}
            </option>
          `
        )
        .join('')}
    </select>
  `;
};
refine
type: function

Sets the number of hits per page and triggers a search.

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const renderHitsPerPage = (renderOptions, isFirstRender) => {
  const { items, refine } = renderOptions;
  const container = document.querySelector('#hits-per-page');

  if (isFirstRender) {
    const select = document.createElement('select');

    select.addEventListener('change', event => {
      refine(event.target.value);
    });

    container.appendChild(select);
  }

  container.querySelector('select').innerHTML = `
    ${items
      .map(
        item => `
          <option
            value="${item.value}"
            ${item.isRefined ? 'selected' : ''}
          >
            ${item.label}
          </option>
        `
      )
      .join('')}
  `;
};
widgetParams
type: object

All original widget options forwarded to the render function.

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const renderHitsPerPage = (renderOptions, isFirstRender) => {
  const { widgetParams } = renderOptions;

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

// ...

search.addWidgets([
  customHitsPerPage({
    container: document.querySelector('#hits-per-page'),
  })
]);

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 customHitsPerPage = instantsearch.connectors.connectHitsPerPage(
  renderHitsPerPage
);

search.addWidgets([
  customHitsPerPage({
    object[] items,
    function transformItems,
  })
]);

Instance options

items
type: object[]
Required

The list of available options, with each item:

  • label: string: the label to display in the option.
  • value: number: the number of hits to display per page.
  • default: boolean: the default hits per page on first search.
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customHitsPerPage({
  items: [
    { label: '8 hits per page', value: 8, default: true },
    { label: '16 hits per page', value: 16 },
  ],
});
transformItems
type: function
default: x => x
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 mapping over the items to transform, and remove or reorder them.

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customHitsPerPage({
  // ...
  transformItems(items) {
    return items.map(item => ({
      ...item,
      label: item.label.toUpperCase(),
    }));
  },
});

Full example

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// Create the render function
const renderHitsPerPage = (renderOptions, isFirstRender) => {
  const { items, hasNoResults, refine, widgetParams } = renderOptions;

  if (isFirstRender) {
    const select = document.createElement('select');

    select.addEventListener('change', event => {
      refine(event.target.value);
    });

    widgetParams.container.appendChild(select);
  }

  const select = widgetParams.container.querySelector('select');

  select.disabled = hasNoResults;

  select.innerHTML = `
    ${items
      .map(
        item => `
          <option
            value="${item.value}"
            ${item.isRefined ? 'selected' : ''}
          >
            ${item.label}
          </option>
        `
      )
      .join('')}
  `;
};

// Create the custom widget
const customHitsPerPage = instantsearch.connectors.connectHitsPerPage(
  renderHitsPerPage
);

// Instantiate the custom widget
search.addWidgets([
  customHitsPerPage({
    container: document.querySelector('#hits-per-page'),
    items: [
      { label: '8 hits per page', value: 8, default: true },
      { label: '16 hits per page', value: 16 },
    ],
  })
]);

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