API Reference / Angular InstantSearch / ais-hits-per-page

ais-hits-per-page

A
Signature 
<ais-hits-per-page
  [items]="object[]"
></ais-hits-per-page>
See code examples

About this widget # A

The ais-hits-per-page 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 ais-configure widget with the hitsPerPage search parameter.

Examples # A

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<ais-hits-per-page
  [items]="[
    { label: '8 hits per page', value: 8, default: true },
    { label: '16 hits per page', value: 16 },
  ]"
></ais-hits-per-page>

Props # A

items #
type: object[]
Required

List of available options.
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<ais-hits-per-page
  [items]="[
    { label: '8 hits per page', value: 8, default: true },
    { label: '16 hits per page', value: 16 },
  ]"
></ais-hits-per-page>

HTML output# A

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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 with connectHitsPerPage# A

If you want to create your own UI of the ais-hits-per-page widget, you can combine the connectHitsPerPage connector with the TypedBaseWidget class.

See code examples

1. Extend the TypedBaseWidget class#

First of all, you will need to write some boilerplate code to initialize correctly the TypedBaseWidget class. This happens in the constructor() of your class extending the TypedBaseWidget class.

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import { Component, Inject, forwardRef, Optional } from '@angular/core';
import { TypedBaseWidget, NgAisInstantSearch, NgAisIndex } from 'angular-instantsearch';

@Component({
  selector: 'app-hits-per-page',
  template: '<p>It works!</p>'
})
export class HitsPerPage extends TypedBaseWidget {
  constructor(
    @Inject(forwardRef(() => NgAisIndex))
    @Optional()
    public parentIndex: NgAisIndex,
    @Inject(forwardRef(() => NgAisInstantSearch))
    public instantSearchInstance: NgAisInstantSearch
  ) {
    super('HitsPerPage');
  }
}

There are a couple of things happening in this boilerplate:

  • create a HitsPerPage class extending TypedBaseWidget
  • reference the <ais-instantsearch> parent component instance on the HitsPerPage widget class
  • set app-hits-per-page as a selector, so we can use our component as <app-hits-per-page></app-hits-per-page>

2. Connect your custom widget#

The TypedBaseWidget class has a method called createWidget() which takes two arguments: the connector to use and an object of options (instance options) for this connector. We call this method at ngOnInit. This component now implements OnInit.

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import { Component, Inject, forwardRef, Optional } from '@angular/core';
import { TypedBaseWidget, NgAisInstantSearch, NgAisIndex } from 'angular-instantsearch';

import connectHitsPerPage, {
  HitsPerPageWidgetDescription,
  HitsPerPageConnectorParams
} from 'instantsearch.js/es/connectors/hits-per-page/connectHitsPerPage';

@Component({
  selector: 'app-hits-per-page',
  template: '<p>It works!</p>'
})
export class HitsPerPage extends TypedBaseWidget<HitsPerPageWidgetDescription, HitsPerPageConnectorParams> {
  public state: HitsPerPageWidgetDescription['renderState']; // Rendering options
  constructor(
    @Inject(forwardRef(() => NgAisIndex))
    @Optional()
    public parentIndex: NgAisIndex,
    @Inject(forwardRef(() => NgAisInstantSearch))
    public instantSearchInstance: NgAisInstantSearch
  ) {
    super('HitsPerPage');
  }
  ngOnInit() {
    this.createWidget(connectHitsPerPage, {
      // instance options
      items: [
        {value: 6, label: '6 per page', default: true},
        {value: 12, label: '12 per page'},
        {value: 24, label: '24 per page'},
      ],
    });
    super.ngOnInit();
  }
}

3. Render from the state#

Your component instance has access to a this.state property which holds the rendering options of the widget.

public state: HitsPerPageWidgetDescription['renderState'];
// {
//   items: object[];
//   hasNoResults: boolean;
//   refine: Function;
//   widgetParams: object;
// }
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<select (change)="state.refine($event.target.value)">
  <option
    *ngFor="let item of state.items"
    [value]="item.value"
    [selected]="item.isRefined"
  >
    {{ item.label }}
  </option>
</select>

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: whether the item is the current refined value
hasNoResults #
type: boolean

Whether the search has results.
refine #
type: function

Sets the number of hits per page and triggers a search.
widgetParams #
type: object

All original widget options forwarded to the render function.

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: whether this is the default hits per page on first search.
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).

Full example#

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import { Component, Inject, forwardRef, Optional } from '@angular/core';
import { TypedBaseWidget, NgAisInstantSearch, NgAisIndex } from 'angular-instantsearch';

import connectHitsPerPage, {
  HitsPerPageWidgetDescription,
  HitsPerPageConnectorParams
} from 'instantsearch.js/es/connectors/hits-per-page/connectHitsPerPage';

@Component({
  selector: 'app-hits-per-page',
  template: `
<select (change)="state.refine($event.target.value)">
  <option
    *ngFor="let item of state.items"
    [value]="item.value"
    [selected]="item.isRefined"
  >
    {{ item.label }}
  </option>
</select>
`
})
export class HitsPerPage extends TypedBaseWidget<HitsPerPageWidgetDescription, HitsPerPageConnectorParams> {
  public state: HitsPerPageWidgetDescription['renderState']; // Rendering options
  constructor(
    @Inject(forwardRef(() => NgAisIndex))
    @Optional()
    public parentIndex: NgAisIndex,
    @Inject(forwardRef(() => NgAisInstantSearch))
    public instantSearchInstance: NgAisInstantSearch
  ) {
    super('HitsPerPage');
  }
  ngOnInit() {
    this.createWidget(connectHitsPerPage, {
      // instance options
      items: [
        {value: 6, label: '6 per page', default: true},
        {value: 12, label: '12 per page'},
        {value: 24, label: '24 per page'},
      ],
    });
    super.ngOnInit();
  }
}
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Angular InstantSearch v4