Fading Coder

One Final Commit for the Last Sprint

Home > Tech > Content

Building an Auto-Playing Image Carousel in Vue.js

Tech May 9 4

Core reqiurements: images cycle automatically on page load. The slideshow pauses when the mouse hovers over the gallery and resumes when the mouse leaves. Users can navigate between slides using left/right arrow buttons. Indicator dots at the bottom reflect the currently active image.

Template Structure

<template>
  <div class="gallery-wrapper">
    <div class="viewport" @mouseenter="pauseSlide" @mouseleave="resumeSlide">
      <ul class="slide-track" :style="trackTransform">
        <li>
          <img :style="{width: slideWidth + 'px'}" :src="images[images.length - 1].src" alt="">
        </li>
        <li v-for="(img, idx) in images" :key="idx">
          <img :style="{width: slideWidth + 'px'}" :src="img.src" alt="">
        </li>
        <li>
          <img :style="{width: slideWidth + 'px'}" :src="images[0].src" alt="">
        </li>
      </ul>
      <ul class="controls">
        <li class="btn-prev" @click="shiftSlide(500, 1, velocity)">
          <svg class="arrow-icon" width="30px" height="30px" viewBox="0 0 1024 1024">
            <path fill="#ffffff" d="M481.233 904c8.189 0 16.379-3.124 22.628-9.372 12.496-12.497 12.496-32.759 0-45.256L166.488 512l337.373-337.373c12.496-12.497 12.496-32.758 0-45.255-12.498-12.497-32.758-12.497-45.256 0l-360 360c-12.496 12.497-12.496 32.758 0 45.255l360 360c6.249 6.249 14.439 9.373 22.628 9.373z" />
          </svg>
        </li>
        <li class="btn-next" @click="shiftSlide(500, -1, velocity)">
          <svg class="arrow-icon" width="30px" height="30px" viewBox="0 0 1024 1024">
            <path fill="#ffffff" d="M557.179 904c-8.189 0-16.379-3.124-22.628-9.372-12.496-12.497-12.496-32.759 0-45.256L871.924 512 534.551 174.627c-12.496-12.497-12.496-32.758 0-45.255 12.498-12.497 32.758-12.497 45.256 0l360 360c12.496 12.497 12.496 32.758 0 45.255l-360 360c-6.249 6.249-14.439 9.373-22.628 9.373z" />
          </svg>
        </li>
      </ul>
      <ul class="indicators">
        <li v-for="(dot, i) in images" :key="i"
            :class="{ active: i === (activeIdx - 1) }"
            @click="goToSlide(i + 1)">
        </li>
      </ul>
    </div>
  </div>
</template>

Styling

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
ol, ul {
  list-style: none;
}
.gallery-wrapper {
  text-align: center;
}
.viewport {
  position: relative;
  width: 500px;
  height: 350px;
  margin: 0 auto;
  overflow: hidden;
}
.slide-track {
  display: flex;
  position: absolute;
}
.btn-prev, .btn-next {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 50px;
  height: 50px;
  background-color: rgba(0, 0, 0, 0.3);
  border-radius: 50%;
  cursor: pointer;
}
.btn-prev {
  left: 3%;
  padding-left: 12px;
  padding-top: 10px;
}
.btn-next {
  right: 3%;
  padding-right: 12px;
  padding-top: 10px;
}
img {
  user-select: none;
}
.indicators {
  position: absolute;
  bottom: 10px;
  left: 50%;
  transform: translateX(-50%);
}
.indicators li {
  display: inline-block;
  width: 15px;
  height: 15px;
  margin: 0 3px;
  border: 1px solid white;
  border-radius: 50%;
  background-color: #333;
  cursor: pointer;
}
.indicators .active {
  background-color: orange;
}

Componant Logic

<script>
export default {
  name: 'ImageCarousel',
  props: {
    baseSpeed: {
      type: Number,
      default: 25
    },
    timing: {
      type: Number,
      default: 3
    }
  },
  data() {
    return {
      images: [
        { src: 'http://img.hb.aicdn.com/adbde61e4343dedd21e97ea7f22666825a8db7d077ffe-qn8Pjn_fw658' },
        { src: 'http://img.hb.aicdn.com/adeed7d28df6e776c2fa6032579c697381d1a82b7fe00-fwRqgn_fw658' },
        { src: 'http://img.hb.aicdn.com/ab7f48509b3c0353017d9a85ef1d12400c9b2724540d4-p3zouo_fw658' },
        { src: 'http://img.hb.aicdn.com/60f788fc2a846192f224b9e6d4904b30e54926211d3d67-ACFJ9G_fw658' },
        { src: 'http://img.hb.aicdn.com/22ded455284aab361b8d2056e82f74a891a019704296a-PSraEB_fw658' }
      ],
      slideWidth: 500,
      activeIdx: 1,
      offset: -500,
      canAnimate: true,
      velocity: this.baseSpeed
    }
  },
  computed: {
    trackTransform() {
      return {
        transform: `translate3d(${this.offset}px, 0, 0)`
      }
    },
    cycleTime() {
      return this.timing * 1000
    }
  },
  mounted() {
    this.startAutoPlay()
    window.onblur = () => this.pauseSlide()
    window.onfocus = () => this.startAutoPlay()
  },
  methods: {
    startAutoPlay() {
      if (this.intervalId) {
        clearInterval(this.intervalId)
        this.intervalId = null
      }
      this.intervalId = setInterval(() => {
        this.shiftSlide(500, -1, this.velocity)
      }, this.cycleTime)
    },
    pauseSlide() {
      clearInterval(this.intervalId)
      this.intervalId = null
    },
    resumeSlide() {
      this.startAutoPlay()
    },
    shiftSlide(step, dir, speed) {
      if (!this.canAnimate) return
      this.canAnimate = false
      dir === -1 ? this.activeIdx += step / 500 : this.activeIdx -= step / 500
      if (this.activeIdx > 5) this.activeIdx = 1
      if (this.activeIdx < 1) this.activeIdx = 5

      const targetPos = this.offset + step * dir
      this.smoothScroll(targetPos, dir, speed)
    },
    smoothScroll(target, direction, speed) {
      if (this.animFrame) {
        clearInterval(this.animFrame)
        this.animFrame = null
      }
      this.animFrame = setInterval(() => {
        if ((direction === -1 && target < this.offset) || (direction === 1 && target > this.offset)) {
          this.offset += speed * direction
        } else {
          this.canAnimate = true
          clearInterval(this.animFrame)
          this.offset = target
          if (target < -2500) this.offset = -500
          if (target > -500) this.offset = -2500
        }
      }, 20)
    },
    goToSlide(index) {
      const dir = index - this.activeIdx >= 0 ? -1 : 1
      const step = Math.abs(index - this.activeIdx) * 500
      const jumpSpeed = Math.abs(index - this.activeIdx) === 0 ? this.velocity : Math.abs(index - this.activeIdx) * this.velocity
      this.shiftSlide(step, dir, jumpSpeed)
    }
  }
}
</script>

Related Articles

Understanding Strong and Weak References in Java

Strong References Strong reference are the most prevalent type of object referencing in Java. When an object has a strong reference pointing to it, the garbage collector will not reclaim its memory. F...

Comprehensive Guide to SSTI Explained with Payload Bypass Techniques

Introduction Server-Side Template Injection (SSTI) is a vulnerability in web applications where user input is improper handled within the template engine and executed on the server. This exploit can r...

Implement Image Upload Functionality for Django Integrated TinyMCE Editor

Django’s Admin panel is highly user-friendly, and pairing it with TinyMCE, an effective rich text editor, simplifies content management significantly. Combining the two is particular useful for bloggi...

Leave a Comment

Anonymous

◎Feel free to join the discussion and share your thoughts.