JS Full-screen scrolling
Refer to the effect of fullPage.js and use your own ideas to achieve it.
Achieved effects: 1. Full screen scrolling, scrolling the gear once will scroll the full screen.
2. Adaptive scaling, no matter how the window size is changed, one element will be used to fill the entire screen.
Next step plan:
1. Change to react component
2. Achieve more effects
The comments are very clear, basically you know Just use the function however you want. It's easy to have an idea.
I am lazy to use a motion framework I wrote before (actually it is a function), which can be used here with slight modifications. Framework related: Click here
The comments are very detailed, so I won’t say anything else. Directly upload the code:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>index</title>
</head>
<style>
*{
margin: 0;
padding: 0;
}
div{
width: 100%;
height: 100%;
}
.one{
background-color: #1bbc9b;
}
.sec{
background-color: #4bbfc3;
}
.thr{
background-color: #7baabe;
}
</style>
<body>
<div class="full one">1</div>
<div class="full sec">2</div>
<div class="full thr">3</div>
</body>
<script>
//添加滚动监听
document.addEventListener('mousewheel',wheel,false);
//判断一次滚动是是否完成
var isComplete = true;
//隐藏滚动条
document.body.style.overflow='hidden';
//获取滚动的元素
var fullList = document.getElementsByClassName("full");
//因为是类数组对象，不是数组对象，所以只能使用call的方式来调用
Array.prototype.forEach.call(fullList,function(value){
//获取一个网页满屏的高
value.style.height = window.innerHeight +'px';
})
//如果窗口大小改变执行的函数
window.onresize = function(){
Array.prototype.forEach.call(fullList,function(value){
value.style.height = window.innerHeight +'px';
});
//改变窗口大小后，应该仍是一个元素占满全屏
if(document.body.scrollTop % window.innerHeight)
{
isComplete = false;
//根据四舍五入判断滚动位置
let tmp = Math.round(document.body.scrollTop / window.innerHeight)* window.innerHeight;
//使用运动框架
showAnimate(document.body,{'scrollTop':tmp},function(){
isComplete = true;
});
}
};
//滚动函数
function wheel(e){
//等待上一个滚动完成
if(isComplete){
//滚动进行时
isComplete = false;
//判断是往上滚动还是往下滚动
if(e.wheelDelta < 0){
//要滚动到的点
let arrivePoint = document.body.scrollTop + window.innerHeight;
//最大的滚动点
let maxBottom = document.body.offsetHeight - window.innerHeight;
//如果超出了最大的滚动点，则赋值为最大滚动点
arrivePoint = arrivePoint > maxBottom ? maxBottom : arrivePoint;
showAnimate(document.body,{'scrollTop':arrivePoint},function(){
isComplete = true;
});
}else{
let arrivePoint = document.body.scrollTop - window.innerHeight;
//最小滚动点为0
arrivePoint = arrivePoint < 0 ? 0 :arrivePoint;
showAnimate(document.body,{'scrollTop':arrivePoint},function(){
isComplete = true;
});
}
}
}
/**
*函数作用：执行动画
*接受参数：obj（需要运动的DOM元素）
* json（需要改变的属性集合，json格式）
* fn（回调函数）
*/
function showAnimate(obj,json,fn){
clearInterval(obj.timer);
//表示运动是否都已经停止
var flag = true;
obj.timer=setInterval(function(){
//循环json
for(var i in json){
if(i == 'opacity'){
//获取透明度值，round四舍五入去除小数点
var icur = Math.round(parseFloat(getStyle(obj,i))*100);
}
else{
//获取属性值
var icur = parseInt(getStyle(obj,i))||obj[i];
}
//缓冲运动，speed随时变换
var speed = (json[i]-icur)/10;//千万要写在定时器里面，写在外面会有意想不到的后果
speed = speed > 0 ? Math.ceil(speed):Math.floor(speed);//速度向上或者下取整，防止到不了over位置
//如果有一个没到达终点就是false
if(json[i] !== icur){
flag = false;
}else{
flag = true;
}
if(i == 'opacity'){
obj.style.filter = 'alpha(opacity:'+(icur+speed)+')';//IE兼容
obj.style.opacity = (icur+speed)/100;
}else if(obj[i]||obj[i] == 0){
obj[i] = icur + speed;
}
else{
obj.style[i] = icur+speed+'px';
}
console.log(icur + ' ' + json[i]);
}
//检查是否所有的运动都已经停止
if(flag){
clearInterval(obj.timer);
if(fn){
fn();
}
}
},13);
}
/**
*函数作用：返回样式属性值
*接受参数：obj（需要获取属性的DOM元素）
* attr（需要获取的属性名称）
*/
function getStyle(obj,attr)
{
if(obj.currentStyle)
{
return obj.currentStyle[attr];//IE兼容
}
else
{
return getComputedStyle(obj,false)[attr];
}
}
</script>
</html>Thank you for reading, I hope it can help everyone, thank you for your support of this site!
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