js moves any element to a specified position
This article mainly introduces how to move any element to a specified position with js. It has certain reference value. Now I share it with you. Friends in need can refer to it.
Idea: Move an element to Specifying the location ====== requires passing in 2 parameters. One is the element to be moved, and the other is the specified position target.
Get the current position of the element, set a distance step for each movement, set a timer, and reach the target position through multiple circular movements. Determine whether a loop needs to be executed based on the distance between the current position and the target position
Take this article as an example. There are several pitfalls here:
1. To move an element, it needs to be separated from the document flow. That is, absolute positioning needs to be used in the css style
2. Every time a click is triggered, a timer is generated. When the button is clicked continuously, the element moves faster
===》Solution: Set only one timer, and clean the timer before executing the timer to prevent the last operation from leaving any impact.
Only setting a timer can be based on the properties of the object. There is only one property clicked on the object. That is, element.timer1=setInterval();
3. To get the current position of the element, you need to use offsetLeft / offsetTop / offsetWidth / offsetHeight. The result is of type number, without px
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style>
div{
width: 200px;
height: 130px;
background: red;
position: absolute;
left: 20px;
}
</style>
</head>
<body>
<input type="button" value="按钮1" id="btn"/>
<input type="button" value="按钮2" id="btn2"/>
<div id="dv">
</div>
<script>
document.getElementById("btn").onclick=function(){
animate(document.getElementById("dv"),400);
};
document.getElementById("btn2").onclick=function(){
animate(document.getElementById("dv"),1600);
};
//把任意元素移动到指定的目标位置
function animate(element,target){
clearInterval(element.timer1);
element.timer1=setInterval(function(){//element是一个对象，对象点出来的属性有且只有一个，避免多次点击按钮产生多个定时器
var current=element.offsetLeft; //获取当前位置，数字类型，没有px。
//不可以用element.style.left，因为该写法只能获取到行内样式，不能获取到<style></style>标签内的样式
var step=10;//每次移动的距离
step=current<target?step:-step;//step的正负表示了向左或是向右移动
current+=step; //计算移动到的位置，数字类型，没有px
if(Math.abs(target-current)>Math.abs(step)){//当离目标位置的距离大于一步移动的距离
element.style.left=current+"px";//移动
}else{//当间距小于一步的距离，则清理定时器，把元素直接拿到目标位置
clearInterval(element.timer1);
element.style.left=target+"px";
}
},20);
}
</script>
</body>
</html>The above is the entire content of this article. I hope it will be helpful to everyone’s study. For more related content, please pay attention to the PHP Chinese website!
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