Home > Article > Web Front-end > Vue implements picture scrolling effect
This time I will bring you Vue to achieve the image scrolling effect. What are the precautions for Vue to achieve the image scrolling effect? The following is a practical case, let's take a look.
Last time I wrote a simple picture carousel, this is equivalent to some improvements on the above. In addition to scrolling images, this component can also embed labels of any content for scrolling. It is encapsulated with slots.Parent:
<template>
<p id="app">
<er-carousel-index :typeNumber=2 :pageNumber=3 :timeSpace=2 :duration=2 :isOrNotCircle="true" url="/src/js/index.json" :isOrNotButton=false>
<template scope="props">-----使用子组件传过来的值，封装slot
<p class="articleList-box-photo ">
<p class="tu imageEffectsAnimate imageEffects_Magnifier">
<a>
<img class="minMax" :src="props.item.img">
</a>
</p>
</p>
<p class="articleList-box-title">
<p class="title">
<a class="textleft">{{props.item.title}}</a>
</p>
</p>
</template>
</er-carousel-index>
</p>
</template>
<script>
import ErCarouselIndex from './components/carouselIndex/src/carouselIndex.vue'
export default {
name: 'app',
data() {
}
},
components: {
ErCarouselIndex//一定要进行组件声明，不然不能引用子组件
}
}
</script>
Child component:
<template>
<p tag="p" class="articleList articleListMod-3 er-carouseindex" name="slide-fade" id="articleList" :style="{height:imgHeight+'px'}" >
<span id="btn1" class="er-carouseindex-left" @mousedown="imgMove('mouseLeft')" @mouseup="cancelMove('left')" v-show="isOrNotButton"></span>
<span id="btn2" class="er-carouseindex-right" @mousedown="imgMove('mouseRight')" @mouseup="cancelMove('right')" v-show="isOrNotButton"></span>
<p id="packageAll" class="er-carouseindex-con" @mouseover="clearAuto" @mouseout="slideAuto">
<p class="er-carouseindex-bar" v-show="isOrNotCircle">
<p v-for="(item,dex) in imgList" @mouseup="clearAuto" class="er-carouseindex-circle" @click="circleClick(dex)" :class="{circleSelected:dex===indexCircle}">
</p>
</p>
<p id="imageAll" class="er-carouseindex-item" :style="{transform:translateX,transition:transFlag?transitionTime:''}">
<p class="articleList-box er-carouseindex-box" v-for="(list,index) in imgLisShow" :style="{width:imgWidth+'%'}"
style="max-height:50%;">
<slot :item="list"></slot>
</p>
</p>
</p>
</p>
</template>
<script>
export default
{
name: "ErCarouselIndex",
data(){
return {
imgList: [],//请求接口数据
imgLisShow: [],//图片滚动数据，包括左中右三种
timer: null,//自动循环滚动时的间隔时间
timeout:null,//长按时的图片滚动间隔时间
index:0,//图片索引
translateXnum:0,//图片滚动时的偏移量
translateX:"",//生成图片偏移时的表达式
imgWidth:"",//图片所占宽度
timeDown:"",//鼠标刚按下时的时间
timeup:"",//鼠标松开时的时间
clickSpace:"",//鼠标按下松开的时间间隙
transFlag:true,//是否匀速滚动,
transitionTime:"",
indexCircle:0//小圆圈滚动索引
}
},
props:{
duration:0,//图片延时滚动
typeNumber:0, //每次滚动几张
timeSpace:0, //图片滚动时间间隔
url:String,//请求接口地址
pageNumber:0,//当前页面显示几张图片
isOrNotButton:true,//是否显示左右按钮
isOrNotCircle:true,//是否显示小圆圈
imgHeight:""//图片滚动显示高度
},
watch:{
index:{
handler(){
var _this=this;
if(Math.abs(this.index)==this.imgList.length){
this.indexCircle=0;
setTimeout(function(){
_this.reset();
},_this.duration*1000*0.98);
}else{
this.indexCircle=this.index;
}
this.calcXnum();
}
},
translateXnum:{
handler(){
this.translateX="translateX("+this.translateXnum+"%)";
}
}
},
methods:{
//页面初始化复赋值
imgView:function() {
var _this = this;
_this.$http.get(_this.url).then(function (res) {
_this.imgList = res.data.imgList;
for(var i=0;i<3;i++){
_this.imgList.forEach(function (item, index) {
_this.imgLisShow.push(item);
});
}
_this.reset();
_this.slideAuto();
_this.imgWidth=(100/_this.pageNumber)-1;
_this.transitionTime="all "+_this.duration*0.98+"s linear";
console.log(_this.transitionTime);
});
},
//图片滚动方法(长按)
imgMove:function(direct){
var _this = this;
_this.timeDown=new Date();//记录按下的时间
_this.timeout = setInterval(function() {
if(direct=="mouseLeft") {
_this.leftMove();
}else{
_this.rightMove();
}
},300);
},
//鼠标送开时执行的方法
cancelMove:function(direct){
var _this = this;
_this.clearAuto();
this.timeup=new Date();//记录松开的时间
this.clickSpace=this.timeup.getTime() - this.timeDown.getTime();
//时间间隔小于500毫秒为点击，反之为长按
if(this.clickSpace<500){
for(var i=0;i<_this.typeNumber;i++){
if(direct=="left"){
_this.leftMove();
}else{
_this.rightMove();
}
}
}
if (this.timeout) {
clearInterval(this.timeout);
this.timeout = null;
}
},
//向左移动
leftMove:function(){
this.index--;
this.transFlag=true;
},
//向右移动
rightMove:function(){
this.transFlag=true;
this.index++;
},
slideAuto:function () {
var _this = this;
_this.timer = setTimeout(function () {
if(Math.abs(_this.index)!==_this.imgList.length){
_this.rightMove();
_this.slideAuto();
}
}, _this.timeSpace * 1000);
},
clearAuto:function () {
console.log("停止");
if (this.timer) {
clearInterval(this.timer);
this.timer = null;
}
},
//重置
reset:function(){
this.index=0;
this.transFlag=false;
this.calcXnum();
},
calcXnum:function(){
var _this=this;
this.translateXnum=-(this.index+this.imgList.length)*(100/this.pageNumber);
},
//点击圆圈跳转图片
circleClick:function(dex){
this.index=dex;
this.clearAuto();
}
},
mounted()
{
this.$nextTick(function () {
this.imgView();
});
}
}
</script>This The component is relatively complete in function. Users can pass parameters to control how many pictures need to be displayed on the current page, the image scrolling time interval, whether to display left and right click buttons, etc. For detailed parameters, you can view props, which all have Comments.
I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website! Recommended reading:Web-side application implements back force refresh
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