API Reference / InstantSearch.js Widgets / menuSelect
Apr. 24, 2019

menuSelect

Widget signature
instantsearch.widgets.menuSelect({
  container: string|HTMLElement,
  attribute: string,
  // Optional parameters
  limit: number,
  sortBy: string[]|function,
  templates: object,
  cssClasses: object,
  transformItems: function,
});

About this widget

The menuSelect widget allows a user to select a single value to refine inside a select element.

Requirements

The attribute provided to the widget must be added in attributes for faceting, either on the dashboard or using attributesForFaceting with the API.

Examples

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instantsearch.widgets.menuSelect({
  container: '#menu-select',
  attribute: 'brand',
});

Options

container
type: string|HTMLElement
Required

The CSS Selector or HTMLElement to insert the widget into.

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instantsearch.widgets.menuSelect({
  // ...
  container: '#menu-select',
});
attribute
type: string
Required

The name of the attribute in the record.

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instantsearch.widgets.menuSelect({
  // ...
  attribute: 'brand',
});
limit
type: number
default: 10
Optional

The maximum amount of values to display.

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instantsearch.widgets.menuSelect({
  // ...
  limit: 20,
});
sortBy
type: string[]|function
default: ["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.

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instantsearch.widgets.menuSelect({
  // ...
  sortBy: ['isRefined'],
});
templates
type: object
Optional

The templates to use for the widget.

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instantsearch.widgets.menuSelect({
  // ...
  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.
  • select: the select element.
  • option: the option elements of the select.
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instantsearch.widgets.menuSelect({
  // ...
  cssClasses: {
    root: 'MyCustomMenuSelect',
    select: [
      'MyCustomMenuSelectElement',
      'MyCustomMenuSelectElement--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.menuSelect({
  // ...
  transformItems(items) {
    return items.map(item => ({
      ...item,
      label: item.label.toUpperCase(),
    }));
  },
});

Templates

item
type: string|function
Optional

The template to customize each option element. It exposes:

  • label: string: the label to display in the option.
  • value: string: the value for the option.
  • count: number: the number of hits that match this value.
  • isRefined: boolean: indicates if it’s the current refined value.
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instantsearch.widgets.menuSelect({
  // ...
  templates: {
    item:
      '{{label}} ({{#helpers.formatNumber}}{{count}}{{/helpers.formatNumber}})',
  },
});
defaultOption
type: string|function
Optional

The template to customize the first option of the select.

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instantsearch.widgets.menuSelect({
  // ...
  templates: {
    defaultOption: 'See all',
  },
});

Customize the UI - connectMenu

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

This connector is also used to build other widgets: Menu

It’s a 3-step process:

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

// 2. Create the custom widget
const customMenuSelect = instantsearch.connectors.connectMenu(
  renderMenuSelect
);

// 3. Instantiate
search.addWidget(
  customMenuSelect({
    // 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 renderMenuSelect = (renderOptions, isFirstRender) => {
  const {
    object[] items,
    boolean canRefine,
    function refine,
    object widgetParams,
  } = renderOptions;

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

  // Render the widget
}

Rendering options

items
type: object[]

The elements that can be refined for the current search results. With each item:

  • value: string: the value of the menu item.
  • label: string: the label of the menu item.
  • count: number: the number of matched results after a refinement is applied.
  • isRefined: boolean: indicates if the refinement is applied.
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const renderMenuSelect = (renderOptions, isFirstRender) => {
  const { items } = renderOptions;

  document.querySelector('#menu-select').innerHTML = `
    <select>
      ${items
        .map(item => `<option value="${item.value}">${item.label}</option>`)
        .join('')}
    </select>
  `;
};
canRefine
type: boolean

Returns true if a refinement can be applied.

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

  document.querySelector('#menu-select').innerHTML = `
    <select ${!canRefine ? 'disabled' : ''}>
      ${items
        .map(item => `<option value="${item.value}">${item.label}</option>`)
        .join('')}
    </select>
  `;
};
refine
type: function

Sets the refinement and triggers a search.

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const renderMenuSelect = (renderOptions, isFirstRender) => {
  const { items, refine } = renderOptions;
  const container = document.querySelector('#menu-select');

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

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

    container.appendChild(select);
  }

  container.querySelector('select').innerHTML = `
    <option value="">See all</option>
    ${items
      .map(
        item =>
          `<option
            value="${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 renderMenuSelect = (renderOptions, isFirstRender) => {
  const { widgetParams } = renderOptions;

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

// ...

search.addWidget(
  customMenuSelect({
    container: document.querySelector('#menu-select'),
  })
);

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 customMenuSelect = instantsearch.connectors.connectMenu(
  renderMenuSelect
);

search.addWidget(
  customMenuSelect({
    attribute: string,
    // Optional parameters
    limit: number,
    sortBy: string[]|function,
    transformItems: function,
  })
);

Instance options

attribute
type: string
Required

The name of the attribute in the record.

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customMenuSelect({
  attribute: 'brand',
});
limit
type: number
default: 10
Optional

The maximum amount of values to display.

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customMenuSelect({
  // ...
  limit: 20,
});
sortBy
type: string[]|function
default: ["isRefined", "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.

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customMenuSelect({
  // ...
  sortBy: ['name:asc'],
});
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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customMenuSelect({
  // ...
  transformItems(items) {
    return items.map(item => ({
      ...item,
      label: item.label.toUpperCase(),
    }));
  },
});

Full example

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// Create the render function
const renderMenuSelect = (renderOptions, isFirstRender) => {
  const { items, canRefine, 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 = !canRefine;

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

// Create the custom widget
const customMenuSelect = instantsearch.connectors.connectMenu(renderMenuSelect);

// Instantiate the custom widget
search.addWidget(
  customMenuSelect({
    container: document.querySelector('#menu-select'),
    attribute: 'brand',
  })
);

HTML output

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<div class="ais-MenuSelect">
  <select class="ais-MenuSelect-select">
    <option class="ais-Menu-option">
      Apple (50)
    </option>
    <!-- more items -->
  </select>
</div>

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