Swiper Svelte Components

Installation

Swiper Svelte is available only via NPM as a part of the main Swiper library:

  npm i swiper

Usage

swiper/svelte exports 2 components: Swiper and SwiperSlide:

  <Swiper
    spaceBetween={50}
    slidesPerView={3}
    on:slideChange={() => console.log('slide change')}
    on:swiper={(e) => console.log(e.detail[0])}
  >
    <SwiperSlide>Slide 1</SwiperSlide>
    <SwiperSlide>Slide 2</SwiperSlide>
    <SwiperSlide>Slide 3</SwiperSlide>
    <SwiperSlide>Slide 4</SwiperSlide>
    ...
  </Swiper>
  <script>
  // Import Swiper Svelte components
  import { Swiper, SwiperSlide } from 'swiper/svelte';

  // Import Swiper styles
  import 'swiper/swiper.scss';
  </script>

By default Swiper Svelte uses core version of Swiper (without any additional modules). If you want to use Navigation, Pagination and other modules, you have to install them first.

Here is the list of additional modules imports:

Virtual - Virtual Slides module
Keyboard - Keyboard Control module
Mousewheel - Mousewheel Control module
Navigation - Navigation module
Pagination - Pagination module
Scrollbar - Scrollbar module
Parallax - Parallax module
Zoom - Zoom module
Lazy - Lazy module
Controller - Controller module
A11y - Accessibility module
History - History Navigation module
HashNavigation - Hash Navigation module
Autoplay - Autoplay module
EffectFade - Fade Effect module
EffectCube - Cube Effect module
EffectFlip - Flip Effect module
EffectCoverflow - Coverflow Effect module
Thumbs - Thumbs module

  <Swiper
    spaceBetween={50}
    slidesPerView={3}
    navigation
    pagination={{ clickable: true }}
    scrollbar={{ draggable: true }}
    on:slideChange={() => console.log('slide change')}
    on:swiper={(e) => console.log(e.detail[0])}
  >
    <SwiperSlide>Slide 1</SwiperSlide>
    <SwiperSlide>Slide 2</SwiperSlide>
    <SwiperSlide>Slide 3</SwiperSlide>
    <SwiperSlide>Slide 4</SwiperSlide>
    ...
  </Swiper>
  <script>
  // import Swiper core and required modules
  import SwiperCore, { Navigation, Pagination, Scrollbar, A11y } from 'swiper';

  import { Swiper, SwiperSlide } from 'swiper/svelte';

  // Import Swiper styles
  import 'swiper/swiper.scss';
  import 'swiper/components/navigation/navigation.scss';
  import 'swiper/components/pagination/pagination.scss';
  import 'swiper/components/scrollbar/scrollbar.scss';

  // install Swiper modules
  SwiperCore.use([Navigation, Pagination, Scrollbar, A11y]);

  </script>

Note, Swiper Svelte component will create required elements for Navigation, Pagination and Scrollbar if you pass these params without specifying its elements (e.g. without navigation.nextEl, pagination.el, etc.)

Styles

Swiper package contains different sets of CSS, Less and SCSS styles:

CSS Styles

CSS styles available only for bundle version:

swiper-bundle.css - all Swiper styles including all modules styles (like Navigation, Pagination, etc.)
swiper-bundle.min.css - same as previous but minified

Less Styles

Less styles are separate styles for core version and modules:

swiper.less - only core Swiper styles
components/a11y/a11y.less - styles required for A11y module
components/controller/controller.less - styles required for Controller module
components/effect-coverflow/effect-coverflow.less - styles required for Coveflow Effect module
components/effect-cube/effect-cube.less - styles required for Cube Effect module
components/effect-fade/effect-fade.less - styles required for Fade Effect module
components/effect-flip/effect-flip.less - styles required for Flip Effect module
components/lazy/lazy.less - styles required for Lazy module
components/navigation/navigation.less - styles required for Navigation module
components/pagination/pagination.less - styles required for Pagination module
components/scrollbar/scrollbar.less - styles required for Scrollbar module
components/thumbs/thumbs.less - styles required for Thumbs module
components/zoom/zoom.less - styles required for Zoom module

SCSS Styles

SCSS styles are also separate styles for core version and modules:

swiper.scss - only core Swiper styles
components/a11y/a11y.scss - styles required for A11y module
components/controller/controller.scss - styles required for Controller module
components/effect-coverflow/effect-coverflow.scss - styles required for Coveflow Effect module
components/effect-cube/effect-cube.scss - styles required for Cube Effect module
components/effect-fade/effect-fade.scss - styles required for Fade Effect module
components/effect-flip/effect-flip.scss - styles required for Flip Effect module
components/lazy/lazy.scss - styles required for Lazy module
components/navigation/navigation.scss - styles required for Navigation module
components/pagination/pagination.scss - styles required for Pagination module
components/scrollbar/scrollbar.scss - styles required for Scrollbar module
components/thumbs/thumbs.scss - styles required for Thumbs module
components/zoom/zoom.scss - styles required for Zoom module

Swiper props

Swiper Svelte component receive all Swiper parameters as component props.

<Swiper
  slidesPerView="{3}"
  spaceBetween="{50}"
  navigation
  pagination
  ...
></Swiper>

Swiper events

Swiper component supports all Swiper events, including additional swiper event that returns swiper instance as soon as posible.

All event arguments will be passed as array and they are accessible in event.detail.

For example:

  <Swiper
    on:swiper={onSwiper}
    on:slideChange={() => console.log('slide change')}
    on:progress={onProgress}
    >
    ...
  </Swiper>
  <script>
    import { Swiper, SwiperSlide } from 'swiper/svelte';

    /* "progress" event emitted with "swiper" and "progress" argumentts */
    const onProgress = (e) => {
      const [swiper, progress] = e.detail;
      console.log(progress);
    }

    /* "swiper" event emitted with "swiper" instance argument */
    const onSwiper = (e) => {
      const [swiper] = e.detail;
      console.log(swiper);
    }
  </script>

SwiperSlide props

Prop	Type	Default	Description
`zoom`	`boolean`	`false`	Enables additional wrapper required for zoom mode
`virtualIndex`	`number`		Actual swiper slide index. Required to be set for virtual slides

SwiperSlide slot data

SwiperSlide component receives the following data object:

isActive - true when current slide is active
isPrev - true when current slide is the previous from active
isNext - true when current slide is the next from active
isVisible - true when current slide is visible (watchSlidesVisibility Swiper parameter must be enabled)
isDuplicate - true when current slide is a duplicate slide (when loop mode enabled) For example:

<Swiper>
  <SwiperSlide let:data="{{ isActive }}">
    <div>Current slide is { isActive ? 'active' : 'not active' }</div>
  </SwiperSlide>
</Swiper>

Slots

Swiper Svelte uses "slots" for content distribution. There are 4 slots available

container-start - element will be added to the beginning of swiper-container
container-end - element will be added to the end of swiper-container
wrapper-start - element will be added to the beginning of swiper-wrapper
wrapper-end - element will be added to the end of swiper-wrapper

For example:

<Swiper>
  <SwiperSlide>Slide 1</SwiperSlide>
  <SwiperSlide>Slide 2</SwiperSlide>
  <span slot="container-start">Container Start</span>
  <span slot="container-end">Container End</span>
  <span slot="wrapper-start">Wrapper Start</span>
  <span slot="wrapper-end">Wrapper End</span>
</Swiper>

Will be rendered as:

<div class="swiper-container">
  <span slot="container-start">Container Start</span>
  <div class="swiper-wrapper">
    <span slot="wrapper-start">Wrapper Start</span>
    <div class="swiper-slide">Slide 1</div>
    <div class="swiper-slide">Slide 2</div>
    <span slot="wrapper-end">Wrapper End</span>
  </div>
  <span slot="container-end">Container End</span>
</div>

Virtual Slides

To implement Virtual Slides we need to:

pass array with slides to Swiper's virtual.slides property
render slides based on virtualData slot's data. It is also mandatory to pass virtualIndex. virtualData is the object with following properties:
- offset - slides left/top offset in px
- from - index of first slide required to be rendered
- to - index of last slide required to be rendered
- slides - slides to render

  <Swiper
    spaceBetween={50}
    slidesPerView={3}
    virtual={{ slides: virtualSlides }}
    let:virtualData={{ slides, offset, from }}
  >
    {#each slides as slide, index (from + index)}
      <SwiperSlide
        virtualIndex={from + index}
        style={`left: ${offset}px`}
      >{slide}</SwiperSlide>
    {/each}
  </Swiper>
  <script>
  import SwiperCore, { Virtual } from 'swiper';
  import { Swiper, SwiperSlide } from 'swiper/svelte';

  // install Virtual module
  SwiperCore.use([Virtual]);

  // Create array with 1000 slides
  const virtualSlides = Array.from({ length: 1000 }).map((el, index) => `Slide ${index + 1}`);
  </script>

Controller

Controller requires to pass one Swiper instance to another:

  <!-- Main Swiper -> pass controlled swiper instance -->
  <Swiper
    controller={{ control: controlledSwiper }}
    ...
  >
    <!-- ... -->
  </Swiper>

  <!-- Controlled Swiper -> store swiper instance -->
  <Swiper
    on:swiper={setControlledSwiper}
    ...
  >
    <!-- ... -->
  </Swiper>
  <script>
    import SwiperCore, { Controller } from 'swiper/core';
    import { Swiper, SwiperSlide } from 'swiper/svelte';

    // install Swiper's Controller component
    SwiperCore.use([Controller]);

    // store Controller swiper instance
    let controlledSwiper = null;

    const setControlledSwiper = (e) => {
      const [swiper] = e.detail;
      // set Controller swiper instance
      setTimeout(() => {
        controlledSwiper = swiper;
      });
    };
  </script>

For two-way control (when both Swipers control each other) it should be like this:

  <Swiper
    on:swiper={setFirstSwiper}
    controller={{ control: secondSwiper }}
    ...
  >
    <!-- ... -->
  </Swiper>

  <Swiper
    on:swiper={setSecondSwiper}
    controller={{ control: firstSwiper }}
    ...
  >
    <!-- ... -->
  </Swiper>
  <script>
    import SwiperCore, { Controller } from 'swiper/core';
    import { Swiper, SwiperSlide } from 'swiper/svelte';

    // install Swiper's Controller component
    SwiperCore.use([Controller]);

    // store swiper instances
    let firstSwiper = null;
    let secondSwiper = null;

    const setFirstSwiper = (e) => {
      const [swiper] = e.detail;
      setTimeout(() => {
        firstSwiper = swiper;
      });
    };

    const setSecondSwiper = (e) => {
      const [swiper] = e.detail;
      setTimeout(() => {
        secondSwiper = swiper;
      });
    };
  </script>

Thumbs

Same as with controller we need to store thumbs instance and pass it to main gallery:

  <!-- Main Swiper -> pass thumbs swiper instance -->
  <Swiper
    thumbs={{ swiper: thumbsSwiper }}
    ...
  >
    <!-- ... -->
  </Swiper>

  <!-- Thumbs Swiper -> store swiper instance -->
  <!-- It is also required to set watchSlidesVisibility and watchSlidesProgress props -->
  <Swiper
    on:swiper={setThumbsSwiper}
    watchSlidesVisibility
    watchSlidesProgress
    ...
  >
    <!-- ... -->
  </Swiper>

  <script>
    import { Swiper, SwiperSlide } from 'swiper/svelte';
    import SwiperCore, { Thumbs } from 'swiper/core';

    // install Swiper's Thumbs component
    SwiperCore.use([Thumbs]);

    // store Thumbs swiper instance
    let thumbsSwiper = null;

    const setThumbsSwiper = (e) => {
      const [swiper] = e.detail;
      // set Thumbs swiper instance
      setTimeout(() => {
        thumbsSwiper = swiper;
      });
    };

  </script>

Effects

The following effects are available:

- Fade
- Cube
- Overflow
- Flip

To use effects you have to import and install them first (as all other modules) (Fade example):

import SwiperCore, { EffectFade } from 'swiper';

SwiperCore.use([EffectFade]);

You can find running effect demos here.

Full Fade Effect Example

<Swiper effect="fade">
  <SwiperSlide>Slide 1</SwiperSlide>
  <SwiperSlide>Slide 2</SwiperSlide>
  <SwiperSlide>Slide 3</SwiperSlide>
</Swiper>
<script>
  import { Swiper, SwiperSlide } from 'swiper/svelte';
  import SwiperCore, { EffectFade } from 'swiper';

  import 'swiper/swiper.scss';
  import 'swiper/components/effect-fade/effect-fade.scss';

  SwiperCore.use([EffectFade]);
</script>

Using with Sapper and SvelteKit

Sapper (in SSR mode) requires components and the app to be compiled with the exact same compiler version. In this case we need to use Swiper's .svelte components directly like so:

<script>
  /* Import Swiper and SwiperSlide components from .svelte files */
  import Swiper from 'swiper/esm/svelte/swiper.svelte';
  import SwiperSlide from 'swiper/esm/svelte/swiper-slide.svelte';
</script>

<Swiper>
  <SwiperSlide>Slide 1</SwiperSlide>
  <SwiperSlide>Slide 2</SwiperSlide>
  ...
</Swiper>