Question

VanillaJS 到 VueJS 错误：Flickity 的错误元素：旋转木马

2019-02-01

4289

javascript vue.js vuejs2 flickity

我正在尝试让此 Flickity 示例 (CodePen) 在 VueJS 组件中运行。

HTML

<div class="carousel">
  <div class="carousel-cell"></div>
  <div class="carousel-cell"></div>
  <div class="carousel-cell"></div>
  <div class="carousel-cell"></div>
  <div class="carousel-cell"></div>
</div>

JS

 var flkty = new Flickity('.carousel');

    flkty.on( 'dragStart', function() {
      console.log('dragStart');
    });

我收到此错误:

bad element for Flickity: carousel

我的 不起作用 的版本:

JS data ()

import Flickity from 'flickity'
var flkty = new Flickity('.carousel')
export default {
  data () {
    return {
      flickityOptions: {
        dragThreshold: 50,
        initialIndex: 1,
        prevNextButtons: false,
        pageDots: false,
        wrapAround: false,
        hash: true,
        percentPosition: false
      },

JS mounted ()

  mounted () {
    flkty.on('dragStart', function () {
      this.stageDragging = true
      console.log('stageDragging: ' + this.stageDragging)
    })
    flkty.on('dragEnd', function () {
      this.stageDragging = false
      console.log('stageDragging: ' + this.stageDragging)
    })

如何在 VueJS 组件中使用此 Flickity 示例？

Answer 1

在您的 <script> 部分中，JavaScript 在模板于文档中呈现之前执行，因此如果在钩子之外调用，Flickity 将无法找到 .carousel 。 Vue 实例有一个 mounted() 生命周期钩子，它会在其模板渲染后被调用，您应该在此处创建 Flickity 轮播：

// const flkty = new Flickity(...) // DON'T DO THIS HERE
export default {
  mounted() {
    this.$nextTick(() => {
      const flkty = new Flickity(...)
      // ...
    });
  }
}

此外，不要将 .carousel 类名传递给 Flickity，而是将 ref 传递给 .carousel 元素，以避免抓取文档中意外的 .carousel 元素（例如，如果您有多个组件实例）。

// template
<div ref="carousel">

// script
new Flickity(this.$refs.carousel)

演示

Answer 2

var app = new Vue({
  el: '#app',
  data() {
    return {
      options: {
        dragThreshold: 50,
        initialIndex: 1,
        prevNextButtons: false,
        pageDots: false,
        wrapAround: false,
        hash: true,
        percentPosition: false,
      },
      itemsCount: 5,
      flkty: null,
    }
  },
  mounted: function () {
    this.flkty = new Flickity(`#${this.$el.id} .carousel`);
    this.flkty.on( 'dragStart', function() {
      console.log('dragStart');
    });
  }
})

Vue.config.devtools = false;
Vue.config.productionTip = false;

* { box-sizing: border-box; }

body { font-family: sans-serif; }

.carousel {
  background: #FAFAFA;
}

.carousel-cell {
  width: 66%;
  height: 200px;
  margin-right: 10px;
  background: #8C8;
  border-radius: 5px;
  counter-increment: carousel-cell;
}

.carousel-cell:before {
  display: block;
  text-align: center;
  content: counter(carousel-cell);
  line-height: 200px;
  font-size: 80px;
  color: white;
}

<link href="https://npmcdn.com/flickity@2/dist/flickity.css" rel="stylesheet"/>
<script src="https://npmcdn.com/flickity@2/dist/flickity.pkgd.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>

<div id="app">
  <div class="carousel">
    <div v-for="item in itemsCount" class="carousel-cell">{{ item }}</div>
  </div>
</div>

Answer 3

特定 Rails 案例：

错误提示是因为我在同一个 layout.html.erb 上的 Javascript/Packs 中重复了 CDN 脚本标签和 JS 代码

<%= javascript_pack_tag 'flickity' %>
<script src="https://unpkg.com/flickity@2/dist/flickity.pkgd.min.js"></script>