hdk / hdk-web-query-service

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README.md

Carousel

The carousel is a slideshow for cycling through a series of content, built with CSS 3D transforms. It works with a series of images, text, or custom markup. It also includes support for previous/next controls and indicators.

<template>
  <div>
    <b-carousel
      id="carousel-1"
      v-model="slide"
      :interval="4000"
      controls
      indicators
      background="#ababab"
      img-width="1024"
      img-height="480"
      style="text-shadow: 1px 1px 2px #333;"
      @sliding-start="onSlideStart"
      @sliding-end="onSlideEnd"
    >
      <!-- Text slides with image -->
      <b-carousel-slide
        caption="First slide"
        text="Nulla vitae elit libero, a pharetra augue mollis interdum."
        img-src="https://picsum.photos/1024/480/?image=52"
      ></b-carousel-slide>

      <!-- Slides with custom text -->
      <b-carousel-slide img-src="https://picsum.photos/1024/480/?image=54">
        <h1>Hello world!</h1>
      </b-carousel-slide>

      <!-- Slides with image only -->
      <b-carousel-slide img-src="https://picsum.photos/1024/480/?image=58"></b-carousel-slide>

      <!-- Slides with img slot -->
      <!-- Note the classes .d-block and .img-fluid to prevent browser default image alignment -->
      <b-carousel-slide>
        <template #img>
          <img
            class="d-block img-fluid w-100"
            width="1024"
            height="480"
            src="https://picsum.photos/1024/480/?image=55"
            alt="image slot"
          >
        </template>
      </b-carousel-slide>

      <!-- Slide with blank fluid image to maintain slide aspect ratio -->
      <b-carousel-slide caption="Blank Image" img-blank img-alt="Blank image">
        <p>
          Lorem ipsum dolor sit amet, consectetur adipiscing elit. Suspendisse eros felis, tincidunt
          a tincidunt eget, convallis vel est. Ut pellentesque ut lacus vel interdum.
        </p>
      </b-carousel-slide>
    </b-carousel>

    <p class="mt-4">
      Slide #: {{ slide }}<br>
      Sliding: {{ sliding }}
    </p>
  </div>
</template>

<script>
  export default {
    data() {
      return {
        slide: 0,
        sliding: null
      }
    },
    methods: {
      onSlideStart(slide) {
        this.sliding = true
      },
      onSlideEnd(slide) {
        this.sliding = false
      }
    }
  }
</script>

<!-- b-carousel.vue -->

Please be aware that nested carousels are not supported.

Sizing

Carousels don't automatically normalize slide dimensions. As such, you may need to use additional utilities or custom styles to appropriately size content. When using images in each slide, ensure they all have the same dimensions (or aspect ratio).

When using img-src or img-blank on <b-carousel-slide>, you can set the image width and height via the img-width and img-height props on <b-carousel> and have these values automatically applied to each carousel-slide image.

Note that images will still be responsive and automatically grow or shrink to fit within the width of its parent container.

Internally, <b-carousel-slide> uses the <code><b-img></code> component to render the images. The img-* props map to the corresponding props available to <b-img>.

Interval

Carousel defaults to an interval of 5000ms (5 seconds). You can change the interval between slides by setting the interval prop to the desired number of milliseconds. The smallest supported sliding interval is 1000ms (1 second).

In browsers where the Page Visibility API is supported, the carousel will avoid sliding when the webpage is not visible to the user (such as when the browser tab is inactive, the browser window is minimized, etc.). Sliding will resume when the browser tab is active.

To pause the carousel from auto sliding, set the interval prop to 0. To restart a paused carousel, set the interval back to the desired number of ms.

When the carousel is paused, the user can still switch slides via the controls (if enabled) or touch swipe (on touch enabled devices, if not disabled).

When the users mouse hovers the carousel it will automatically pause, and will automatically restart when the mouse leaves the carousel. To disable this feature, set the no-hover-pause prop on <b-carousel>.

Controls and indicators

Set the prop controls to enable the previous and next control buttons.

Set the prop indicators to show the slide indicator buttons.

Both indicators and controls can be set at the same time or independently.

Carousel slide content

b-carousel-slide provides several props and slots for placing content in the slide.

Props

  • caption Text to use as the main title on the slide (placed inside the inner element which has the class carousel-caption)
  • text Textual placed under the title (placed inside the inner element which has the class carousel-caption)
  • img-src URL of image to be placed into the background of the slide
  • caption-html Alternate prop to the caption prop, which supports HTML strings
  • html Alternate prop to the text prop, which supports HTML strings

Warning: Be cautious of using the caption-html and html props to display user supplied content, as it may make your application vulnerable to XSS attacks, if you do not first sanitize the user supplied string.

Named slots

  • default content that will be placed inside of the inner element which has the class carousel-caption. Appears after any content from the caption and text props.
  • img content to place into the background of the slide. Despite the slot's name, you can place almost any content in this slot in lieu of using the default slot or caption and text props.

Carousel, by default, uses a sliding animation. You can change the slide animation to a cross-fade animation, or disable animation completely.

Crossfade animation

Set the <b-carousel> fade prop to true to animate slides with a fade transition instead of the default slide animation.

<div>
  <b-carousel
    id="carousel-fade"
    style="text-shadow: 0px 0px 2px #000"
    fade
    indicators
    img-width="1024"
    img-height="480"
  >
    <b-carousel-slide
      caption="First Slide"
      img-src="https://picsum.photos/1024/480/?image=10"
    ></b-carousel-slide>
    <b-carousel-slide
      caption="Second Slide"
      img-src="https://picsum.photos/1024/480/?image=12"
    ></b-carousel-slide>
    <b-carousel-slide
      caption="Third Slide"
      img-src="https://picsum.photos/1024/480/?image=22"
    ></b-carousel-slide>
  </b-carousel>
</div>

<!-- b-carousel-fade.vue -->

Disable animation

Set the <b-carousel> no-animation prop to true to disable slide animation.

<div>
  <b-carousel
    id="carousel-no-animation"
    style="text-shadow: 0px 0px 2px #000"
    no-animation
    indicators
    img-width="1024"
    img-height="480"
  >
    <b-carousel-slide
      caption="First Slide"
      img-src="https://picsum.photos/1024/480/?image=10"
    ></b-carousel-slide>
    <b-carousel-slide
      caption="Second Slide"
      img-src="https://picsum.photos/1024/480/?image=12"
    ></b-carousel-slide>
    <b-carousel-slide
      caption="Third Slide"
      img-src="https://picsum.photos/1024/480/?image=22"
    ></b-carousel-slide>
    <b-carousel-slide
      caption="Fourth Slide"
      img-src="https://picsum.photos/1024/480/?image=23"
    ></b-carousel-slide>
  </b-carousel>
</div>

<!-- b-carousel-no-animation.vue -->

Slide wrapping

Normally when the carousel reaches one end or the other in the list of slides, it will wrap to the opposite end of the list of slides and continue cycling.

To disable carousel slide wrapping, set the no-wrap prop to true.

Hide slide text content on small screens

On smaller screens you may want to hide the captions and headings. You can do so via the content-visible-up prop of <b-carousel-slide>. The prop accepts a breakpoint name (i.e. sm, md, lg, xl, or custom breakpoint names if you have defined them), and will hide the headings and captions on screens smaller than the breakpoint.

Touch swipe support

On touch enabled devices, users can switch slides by swiping left or right on the carousel. To disable touch control, set the no-touch prop to true.

v-model support

Programmatically control which slide is showing via v-model (which binds to the value prop). Note, that slides are indexed starting at 0.

Programmatic slide control

The <b-carousel> instance provides several public methods for controlling sliding:

Method Description
setSlide(index) Go to slide specified by index
next() Go to next slide
prev() Go to previous slide
pause() Pause the slide cycling
start() Start slide cycling (prop interval must have a value)

You will need a reference (via this.$refs) to the carousel instance in order to call these methods:

<template>
  <b-carousel ref="myCarousel" .... >
    <!-- slides go here -->
  </b-carousel>
</template>

<script>
  export default {
    // ...
    methods: {
      prev() {
        this.$refs.myCarousel.prev()
      },
      next() {
        this.$refs.myCarousel.next()
      }
    }
  }
</script>

Accessibility

Carousels are generally not fully compliant with accessibility standards, although we try to make them as accessible as possible.

By providing a document unique value via the id prop, <b-carousel> will enable accessibility features. It is highly recommended to always add an ID to all components.

All carousel controls and indicators have aria labels. These can be customized by setting the various label-* props.

Note: The animation effect of this component is dependent on the prefers-reduced-motion media query. See the reduced motion section of our accessibility documentation for additional details.

<!-- Component reference added automatically from component package.json -->