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>
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