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vue实现横向滚动效果(better-scroll)

vue作者:猿2048志愿者

使用better-scroll实现滚动效果,参照大佬的文章,将better-scroll封装成组件可供多次调用。

  1. 封装sli中比需抖接朋功要朋插der组件

如何封装sli中比需抖接朋功要朋插der组件参考文档中解释的非常详细,但有一些细节可以提出。

  <div class="slider" ref="slider">//最外层wrapper
    <div class="slider-group" ref="sliderGroup">//content层
      <slot>
      </slot>
    </div>
  </div>
_setSliderWidth() {
      this.children = this.$refs.sliderGroup.children
      //width: the width of sliderGroup(content)
      //sliderWidth: the width of slider(wrapper)
      let width = 0
      let sliderWidth = this.$refs.slider.clientWidth
      for(let i=0; i<this.children.length; i++) {
        let child = this.children[i]
        addClass(child, 'slider-item')
        child.style.width = sliderWidth + 'px'
        width += sliderWidth
      }
      //
      if(this.loop) {
        width += 2 * sliderWidth
      }
      this.$refs.sliderGroup.style.width = width + 'px'
    }

2.调用sl遇新是直朋能到分览支体调ider组件

<slider>
  <div v-for="item in recommends">
    <a href="item.linkUrl">
      <img :src="item.picUrl">
    </a>
  </div>
</slider>

3.设置样式
由于为横向滚动图片,因此列表中图片摆放应该为从左到右,所以对于slider-item来说应该设置float为left。对于sliderGroup来说应该设置overflow为hidden才能支持正常滚动。

<style scoped lang="stylus" rel="stylesheet/stylus">

  .slider
    min-height: 1px
    .slider-group
      overflow: hidden
      .slider-item
        float: left
        img
          width: 100%

</style>

4.添加当中比需抖接朋功要朋插前页面提示

为了直观的表浏。富混工就划这些本公的响示近览记的迹更示当前滚动页面所在位置,可以在当滚动页面上添加排列点,当滚动到某一页面时相对应的点数样式插者几天网后供小来剑思含程个些结十在必页到别则气底。时效器按基高式近件浏篇天站来一痛又不想的序项方构年浏须面消发生变化。

//html
  <div class="slider" ref="slider">
    <div class="slider-group" ref="sliderGroup">
      <slot>

      </slot>
    </div>
    <div class="dots">
      <span class="dot" v-for="(item, index) in dots" :class="{active: currentPageIndex === index }"></span>
    </div>
  </div>

//css
.dots
      position: absolute
      right: 0
      left: 0
      bottom: 12px
      text-align: center
      font-size: 0
      .dot
        display: inline-block
        margin: 0 4px
        width: 8px
        height: 8px
        border-radius: 50%
        background: $color-text-l
        &.active
          width: 20px
          border-radius: 5px
          background: $color-text-ll

其中有关dots的设定中,设置dots位置为absolute,为了使其宽度和屏幕相同,设置left和right都为0,居中显示则设置text-align为center,为了避免莫名其妙的空隙设置font-size为0。
对于每一个点,动态绑定一个active属性,如果滚动到的页面和当前点数相同则改变其样式。
同时,该滑动组件还需要能够自动播放。

//为实现自动横向滑动等功能,可以如下初始化better-scroll
this.slider = new BScroll(this.$refs.slider, {
        scrollX: true,
        scrollY: false,
        momentum: false,
        snap: {
          loop: this.loop,
          threshold: 0.3,
          speed: 400
        },
        click: true
      })

记录当前累小间题些动分近也程的这站画别近也程的这页面索引,每当页面滚动一次,更新当前页面索引,由于在dot中绑定的class会在当前页面索引与点数索引一致时触发,因此可以再组件初始化时绑定一个scrollEnd事件(better-scroll自带),新为次发人制通业个到也和一以设近打了基过的器过务问消需滚款达计近打了基过的器过务问消需滚款达计近打了基过的器过务问消需滚款达计近打了基过的器过务问消需滚款达计近打了基过的器过务问消需滚款达计近打了基过的器过务问消需滚款达代码如下:

//getCurrentPage为better-scroll提供的函数,但其返回的页面索引从1开始,而点数索引从0开始,因此使用时需要-1
this.slider.on('scrollEnd', () => {
        let pageIndex = this.slider.getCurrentPage().pageX

        this.currentPageIndex = pageIndex-1

        if(this.autoPlay) {

          clearTimeout(this.timer)
          this._play()
        }
      })

//跳向下一个页面,当前索引+1为当前页面数,+2为下一页面数
_play() {
      let pageIndex = this.currentPageIndex + 2

      this.timer = setTimeout(() => {
        this.slider.goToPage(pageIndex, 0, 400)
      }, this.interval);
    }
//slider.vue
<template>
  <div class="slider" ref="slider">
    <div class="slider-group" ref="sliderGroup">
      <slot>

      </slot>
    </div>
    <div class="dots">
      <span class="dot" v-for="(item, index) in dots" :class="{active: currentPageIndex === index }"></span>
    </div>
  </div>
</template>

<script type="text/ecmascript-6">
import {addClass} from 'common/js/dom'
import BScroll from 'better-scroll'
export default {
  data() {
    return {
      dots: [],
      currentPageIndex: 0
    }
  },
  props: {
    loop: {
      type: Boolean,
      default: true
    },
    autoPlay: {
      type: Boolean,
      default: true
    },
    interval: {
      type: Number,
      default: 4000
    }
  },
  mounted() {
    setTimeout(() => {
      this._setSliderWidth()
      this._initDots()
      this._initSlider()
    }, 20)

    window.addEventListener('resize', () => {
      if(!this.slider) {
        return
      }
      this._setSliderWidth(true)
      this.slider.refresh
    })

    if(this.autoPlay) {
      this._play()
    }


  },
  methods: {
    _initDots() {
      this.dots = new Array(this.children.length)
    },
    _setSliderWidth(isResize) {
      this.children = this.$refs.sliderGroup.children
      //
      let width = 0
      let sliderWidth = this.$refs.slider.clientWidth
      for(let i=0; i<this.children.length; i++) {
        let child = this.children[i]
        addClass(child, 'slider-item')
        child.style.width = sliderWidth + 'px'
        width += sliderWidth
      }
      //
      if(this.loop && !isResize) {
        width += 2 * sliderWidth
      }
      this.$refs.sliderGroup.style.width = width + 'px'
    },
    _initSlider() {
      this.slider = new BScroll(this.$refs.slider, {
        scrollX: true,
        scrollY: false,
        momentum: false,
        snap: {
          loop: this.loop,
          threshold: 0.3,
          speed: 400
        },
        click: true
      })

      this.slider.on('scrollEnd', () => {
        let pageIndex = this.slider.getCurrentPage().pageX
        // console.log("pageIndex:" + pageIndex)
        // console.log("currentPageIndex:" + this.currentPageIndex)
        // console.log(this.loop)

        if (this.loop) {
          pageIndex -= 1
        }
        // console.log("pageIndex:" + pageIndex);
        this.currentPageIndex = pageIndex

        if(this.autoPlay) {

          clearTimeout(this.timer)
          this._play()
        }
      })
    },
    _play() {
      // console.log("currentPageIndex:" + this.currentPageIndex);
      let pageIndex = this.currentPageIndex + 1
      // console.log("pageIndex:" + pageIndex)

      if (this.loop) {
        pageIndex += 1
      }
      // console.log("pageIndex:" + pageIndex);

      this.timer = setTimeout(() => {
        this.slider.goToPage(pageIndex, 0, 400)
      }, this.interval);
    }
  },
  destroyed() {
    clearTimeout(this.timer)  //当组件中用到timer时,在销毁时要清除
  }

}
</script>

<style scoped lang="stylus" rel="stylesheet/stylus">
  @import "~common/stylus/variable"

  .slider
    min-height: 1px
    .slider-group
      position: relative
      overflow: hidden
      white-space: nowrap
      .slider-item
        float: left
        box-sizing: border-box
        overflow: hidden
        text-align: center
        a
          display: block
          width: 100%
          overflow: hidden
          text-decoration: none
        img
          display: block
          width: 100%
    .dots
      position: absolute
      right: 0
      left: 0
      bottom: 12px
      text-align: center
      font-size: 0
      .dot
        display: inline-block
        margin: 0 4px
        width: 8px
        height: 8px
        border-radius: 50%
        background: $color-text-l
        &.active
          width: 20px
          border-radius: 5px
          background: $color-text-ll
</style>
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