Vue implementation of page loading animation code tutorial

We often see that when the data does not appear, there will be a prompt message on the page. The page is loading. How to achieve this effect? ​​This article mainly introduces the Vue page loading animation effect in detail. The Vue page appears to be loading. The initial page and the animation effect have certain reference value. Interested friends can refer to it. I hope it can help everyone.

Please look at the code below

<template>
 <section class="page" v-if="option" 
  :style="{background: option.background,color: option.color||&#39;#fff&#39;}"  
  :class="{&#39;page-before&#39;: option.index < currentPage,
    &#39;page-after&#39;: option.index > currentPage,
    &#39;page-current&#39;: option.index === currentPage}">
  <p :class="{&#39;all-center&#39;: option.isCenter}">
   <slot></slot>
  </p>
 </section>
 <section class="page" v-else>页面正在渲染中。。。</section>
</template>

Do you think it is very simple
The following is some dry information to achieve the animation effect of the page

<template>
 <nav class="controller">
  <button v-if="option.arrowsType" class="prev-btn" :class="{moving:option.arrowsType === &#39;animate&#39;}" @click="changePage(prevIndex)"></button>
  <ul v-if="option.navbar">
   <li v-for="index in pageNum" @click="changePage(index)" :class="{current:option.highlight && index === currentPage}" :key="&#39;controller-&#39;+index" :data-index="index" class="controller-item"></li>
  </ul>
  <button v-if="option.arrowsType" class="next-btn" :class="{moving:option.arrowsType === &#39;animate&#39;}" @click="changePage(nextIndex)"></button>
 </nav>
</template>

<script>
export default {
 name: &#39;page-controller&#39;,
 props: {
 pageNum: Number,
 currentPage: Number,
 option: {
  type: Object,
  default: {
  arrowsType: &#39;animate&#39;,
  navbar: true,
  highlight: true,
  loop: true  //是否开启滚动循环
  }
 }
 },
 methods: {
 changePage (index) {
  this.$emit(&#39;changePage&#39;, index);
 }
 },
 computed: {
 nextIndex () {
  if (this.currentPage === this.pageNum) {
  if(this.option.loop){
   return 1
   }else{
   return this.pageNum
   }
  } else {
  return this.currentPage + 1;
  }
 },
 prevIndex () {
  if (this.currentPage === 1) {
  if(this.option.loop){
   return this.pageNum
   }else{
   return 1
   }
  } else {
  return this.currentPage - 1;
  }
 }
 },
 created () {
 if (this.option.navbar === undefined) {
  this.option.navbar = true;
 }
 },
 mounted () {
 let _this = this;
 let timer = null;
 let start = 0;
 // 滚轮处理
 function scrollHandler (direction) {
  // 防止重复触发滚动事件
  if (timer != null) {
  return;
  }
  if (direction === &#39;down&#39;) {
  _this.changePage(_this.nextIndex);
  } else {
  _this.changePage(_this.prevIndex);
  }
  timer = setTimeout(function() {
  clearTimeout(timer);
  timer = null;
  }, 300);
 }
 // if (Object.hasOwnProperty.call(window,&#39;onmousewheel&#39;)) {
 if (Object.hasOwnProperty.call(window,&#39;onmousewheel&#39;)) {
  // 监听滚轮事件
  window.addEventListener(&#39;mousewheel&#39;,function (event) { // IE/Opera/Chrome
  let direction = event.wheelDelta > 0 ? &#39;up&#39;:&#39;down&#39;;
  scrollHandler(direction);
  },false);
 } else {
  window.addEventListener(&#39;DOMMouseScroll&#39;,function (event) { // Firefox
  let direction = event.detail > 0 ? &#39;up&#39;:&#39;down&#39;;
  scrollHandler(direction);
  },false);
 }
 // 移动端触摸事件处理
 window.addEventListener(&#39;touchstart&#39;, function (event) {
  start = event.touches[0].clientY;
 })
 window.addEventListener(&#39;touchmove&#39;, function (event) {
  event.preventDefault();
 })
 window.addEventListener(&#39;touchend&#39;, function (event) {
  let spacing = event.changedTouches[0].clientY - start;
  let direction;  
  if (spacing > 50) {
  direction = &#39;up&#39;;
  scrollHandler(direction);
  } else if (spacing < -50) {
  direction = &#39;down&#39;;
  scrollHandler(direction);
  }
 })
 }
}
</script>

<style scoped>
.controller {
 position: fixed;
 right: 20px;
 top: 50%;
 z-index: 99;
}
.controller ul {
 transform: translate3d(0,-50%,0);
 list-style: none;
 margin: 0;
 padding: 0;
}
.controller-item {
 cursor: pointer;
 width: 20px;
 height: 20px;
 border-radius: 50%;
 margin-top: 10px;
 background-color: rgba(255, 255, 255, 0.3);
 transition: background-color 0.3s ease 0s;
}
.controller-item:hover {
 background-color: rgba(255, 255, 255, 0.7);
}
.controller-item.current {
 background-color: rgba(255, 255, 255, 1);
}
.prev-btn,.next-btn {
 cursor: pointer;
 display: block;
 text-align: center;
 width: 20px;
 height: 20px;
 position: fixed;
 left: 50%;
 margin-left: -10px;
 border: 4px solid #fff;
 background-color: transparent;
 outline: none;
}
.prev-btn {
 top: 80px;
 transform: rotate(-45deg);
 border-bottom-color: transparent;
 border-left-color: transparent;
}
.next-btn {
 bottom: 80px;
 transform: rotate(45deg);
 border-top-color: transparent;
 border-left-color: transparent;
}
.prev-btn.moving {
 animation: prev-up-down 0.7s linear 0s infinite;
}
.next-btn.moving {
 animation: next-up-down 0.7s linear 0s infinite;
}
@keyframes next-up-down {
 0% {
 transform: translate3d(0,0,0) rotate(45deg);
 }
 25% {
 transform: translate3d(0,6px,0) rotate(45deg);
 }
 50% {
 transform: translate3d(0,0,0) rotate(45deg);
 }
 75% {
 transform: translate3d(0,-6px,0) rotate(45deg);
 }
 100% {
 transform: translate3d(0,0,0) rotate(45deg);
 }
}
@keyframes prev-up-down {
 0% {
 transform: translate3d(0,0,0) rotate(-45deg);
 }
 25% {
 transform: translate3d(0,-6px,0) rotate(-45deg);
 }
 50% {
 transform: translate3d(0,0,0) rotate(-45deg);
 }
 75% {
 transform: translate3d(0,6px,0) rotate(-45deg);
 }
 100% {
 transform: translate3d(0,0,0) rotate(-45deg);
 }
}
</style>

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