我们经常看到数据未出现时，页面中会有一条提示消息， 页面正在加载中，如何实现该效果呢 ，请看下面代码
<template>
<section class="page" v-if="option"
:style="{background: option.background,color: option.color||'#fff'}"
:class="{'page-before': option.index < currentPage,
'page-after': option.index > currentPage,
'page-current': option.index === currentPage}">
<div :class="{'all-center': option.isCenter}">
<slot></slot>
</div>
</section>
<section class="page" v-else>页面正在渲染中。。。</section>
</template>
有木有感觉很简单
下面上点干货，实现页面的动画效果
<template>
<nav class="controller">
<button v-if="option.arrowsType" class="prev-btn" :class="{moving:option.arrowsType === 'animate'}" @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="'controller-'+index" :data-index="index" class="controller-item"></li>
</ul>
<button v-if="option.arrowsType" class="next-btn" :class="{moving:option.arrowsType === 'animate'}" @click="changePage(nextIndex)"></button>
</nav>
</template>
<script>
export default {
name: 'page-controller',
props: {
pageNum: Number,
currentPage: Number,
option: {
type: Object,
default: {
arrowsType: 'animate',
navbar: true,
highlight: true,
loop: true //是否开启滚动循环
}
}
},
methods: {
changePage (index) {
this.$emit('changePage', 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 === 'down') {
_this.changePage(_this.nextIndex);
} else {
_this.changePage(_this.prevIndex);
}
timer = setTimeout(function() {
clearTimeout(timer);
timer = null;
}, 300);
}
// if (Object.hasOwnProperty.call(window,'onmousewheel')) {
if (Object.hasOwnProperty.call(window,'onmousewheel')) {
// 监听滚轮事件
window.addEventListener('mousewheel',function (event) { // IE/Opera/Chrome
let direction = event.wheelDelta > 0 ? 'up':'down';
scrollHandler(direction);
},false);
} else {
window.addEventListener('DOMMouseScroll',function (event) { // Firefox
let direction = event.detail > 0 ? 'up':'down';
scrollHandler(direction);
},false);
}
// 移动端触摸事件处理
window.addEventListener('touchstart', function (event) {
start = event.touches[0].clientY;
})
window.addEventListener('touchmove', function (event) {
event.preventDefault();
})
window.addEventListener('touchend', function (event) {
let spacing = event.changedTouches[0].clientY - start;
let direction;
if (spacing > 50) {
direction = 'up';
scrollHandler(direction);
} else if (spacing < -50) {
direction = 'down';
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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