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Javascript method to implement left-swipe deletion: 1. Calculate the font size of the root node HTML; 2. Initialize the font size of the root node HTML; 3. Set the side-swipe to display the delete button; 4. Through "event.preventDefault ()..." Just swipe left to delete.
The operating environment of this article: windows7 system, javascript version 1.8.5, Dell G3 computer.
How to achieve left-swipe deletion in JavaScript?
Pure js left slide delete function
The code is as follows:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
<title>js侧滑显示删除按钮</title>
<style>
*{margin:0;padding:0;}
body{font-size:.14rem;}
li{list-style:none;}
i{font-style:normal;}
a{color:#393939;text-decoration:none;}
.list{overflow:hidden;margin-top:.2rem;padding-left:.3rem;border-top:1px solid #ddd;}
.list li{overflow:hidden;width:120%;border-bottom:1px solid #ddd;}
.list li a{display:block;height:.88rem;line-height:.88rem;-webkit-transition:all 0.3s linear;transition:all 0.3s linear;}
.list li i{float:right;width:15%;text-align:center;background:#E2421B;color:#fff;}
.swipeleft{transform:translateX(-15%);-webkit-transform:translateX(-15%);}
</style>
<script>
//计算根节点HTML的字体大小
function resizeRoot(){
var deviceWidth = document.documentElement.clientWidth,
num = 750,
num1 = num / 100;
if(deviceWidth > num){
deviceWidth = num;
}
document.documentElement.style.fontSize = deviceWidth / num1 + "px";
}
//根节点HTML的字体大小初始化
resizeRoot();
window.onresize = function(){
resizeRoot();
};
</script>
</head>
<body>
<section>
<div class="list">
<ul>
<li><a href="#">侧滑显示删除按钮1<i>删除</i></a></li>
<li><a href="#">侧滑显示删除按钮2<i>删除</i></a></li>
<li><a href="#">侧滑显示删除按钮3<i>删除</i></a></li>
</ul>
</div>
<script>
//侧滑显示删除按钮
var expansion = null; //是否存在展开的list
var container = document.querySelectorAll('.list li a');
for(var i = 0; i < container.length; i++){
var x, y, X, Y, swipeX, swipeY;
container[i].addEventListener('touchstart', function(event) {
x = event.changedTouches[0].pageX;
y = event.changedTouches[0].pageY;
swipeX = true;
swipeY = true ;
if(expansion){ //判断是否展开，如果展开则收起
expansion.className = "";
}
});
container[i].addEventListener('touchmove', function(event){
X = event.changedTouches[0].pageX;
Y = event.changedTouches[0].pageY;
// 左右滑动
if(swipeX && Math.abs(X - x) - Math.abs(Y - y) > 0){
// 阻止事件冒泡
event.stopPropagation();
if(X - x > 10){ //右滑
event.preventDefault();
this.className = ""; //右滑收起
}
if(x - X > 10){ //左滑
event.preventDefault();
this.className = "swipeleft"; //左滑展开
expansion = this;
}
swipeY = false;
}
// 上下滑动
if(swipeY && Math.abs(X - x) - Math.abs(Y - y) < 0) {
swipeX = false;
}
});
}
</script>
</body>
</html>Recommended learning: "javascript basic tutorial"
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