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Code case sharing for native js encapsulation of custom scroll bars

黄舟

Mar 25, 2017 pm 02:49 PM

This article mainly introduces the relevant knowledge of native js encapsulating custom scroll bars. Has very good reference value. Let's take a look at it with the editor

Recently there was a project about making an online music player, which required the use of a scroll bar, but the built-in scroll bar was too ugly, so I thought about it myself. Custom scroll bars.

I read the principles online, but to be honest I didn’t understand much. I studied it while I was using Android this morning, and I’m pretty satisfied with the results. Then wrap a object.

The method of use is very simple, just customize a p, import this object as a parameter, and just click new. You can also define the style of the scroll bar yourself, just modify the style sheet yourself

Rendering:

Code case sharing for native js encapsulation of custom scroll bars

## The code is as follows:

<!doctype html> 
<html> 
<head> 
 <meta charset="utf-8"> 
 <title></title> 
</head>
<style type="text/css">
p{
 padding:0px;
 box-sizing:border-box;
 margin:0px;
 border:0px;
}
#p-5{
 width: 700px;
 height: 500px;
 border:1px solid black;
 position: relative;
 overflow: hidden;
}
.ribbit-OF-p1{
 width: 20px;
 background-color: rgb(239, 238, 238);
 border:1px solid rgba(0,0,0,0.5);
 position: absolute;
 right:0px;
 top: 0px;
 cursor:default;
}
.ribbit-OF-p2{
 position: absolute;
 top:0px;
 right: 0px;
 width: 100%;
 height: 100px;
 background-color:rgba(0,0,0,0.3);
 border-radius: 10px;
}
.ribbit-OF-p3{
 width: 100%;
 height:auto;
 background-color: lime;
}
</style>
<body>
<p id="p-1">
<p id="p-2">

</p> 
</p>
<p id="p-3"><p id="p-4"></p></p>
<p id="p-5">
  123123<br/>
qwe<br/>
12asd23<br/>
asd3123<br/>
qwe123<br/>
235423423<br/>
azxc123<br/>
123123<br/>
qwe<br/>
12asd23<br/>
asd3123<br/>
qwe123<br/>
235423423<br/>
azxc123<br/>
123123<br/>
qwe<br/>
12asd23<br/>
asd3123<br/>
qwe123<br/>
235423423<br/>
azxc123<br/>
123123<br/>
qwe<br/>
12asd23<br/>
asd3123<br/>
qwe123<br/>
235423423<br/>
azxc123<br/>
123123<br/>
qwe<br/>
12asd23<br/>
asd3123<br/>
qwe123<br/>
235423423<br/>
azxc123<br/>
123123<br/>
qwe<br/>
12asd23<br/>
asd3123<br/>
qwe123<br/>
235423423<br/>
azxc123<br/>123123<br/>
qwe<br/>
12asd23<br/>
asd3123<br/>
qwe123<br/>
235423423<br/>
azxc123<br/>
123123<br/>
qwe<br/>
12asd23<br/>
asd3123<br/>
qwe123<br/>
235423423<br/>
azxc123<br/>
123123<br/>
qwe<br/>
12asd23<br/>
asd3123<br/>
qwe123<br/>
235423423<br/>
azxc123<br/>
</p>
</body>
<script type="text/javascript">
var p_5 = document.getElementById(&#39;p-5&#39;);
function OverFlow(element){
 this.element = element;
 this.ribbit_OF_p1 = document.createElement("p");
 this.ribbit_OF_p2 = document.createElement("p");
 this.ribbit_OF_p3 = document.createElement("p");
 this.createp = function(){
  this.ribbit_OF_p1.className = "ribbit-OF-p1";
  this.ribbit_OF_p2.className = "ribbit-OF-p2";
  this.ribbit_OF_p3.className = "ribbit-OF-p3";
  this.ribbit_OF_p3.innerHTML = this.element.innerHTML;
  this.element.innerHTML="";
  this.element.appendChild(this.ribbit_OF_p3);
  this.ribbit_OF_p1.appendChild(this.ribbit_OF_p2);
  document.body.appendChild(this.ribbit_OF_p1);
  this.ribbit_OF_p1.style.height = getComputedStyle(this.element,null).height;
  this.ribbit_OF_p1.style.left = (this.element.offsetLeft+(parseInt(getComputedStyle(this.element,null).width)
  -parseInt(getComputedStyle(this.ribbit_OF_p1,null).width)))+"px";
  this.ribbit_OF_p1.style.top = this.element.offsetTop+"px";
  this.ribbit_OF_p2.style.top = "0px";
 }
 this.addAudo=function(){
  var YY=null;//前鼠标位置
  var topXX = 0;//前top位置
  var topX = 0;//后top值
  var vherght = parseInt(getComputedStyle(this.ribbit_OF_p3,null).height)-parseInt(getComputedStyle(this.element,null).height);//可移动
  var dst = 0;
  //最大top移动位置
  var top_x = parseInt(getComputedStyle(this.ribbit_OF_p1,null).height)-parseInt(getComputedStyle(this.ribbit_OF_p2,null).height);
  var thio = this;
  window.onmousemove = function(e){
   fun(e.clientY);
  };
  this.ribbit_OF_p2.onmousedown=function(e){
   YY = e.clientY;
   topXX =parseInt(this.style.top);
   return false;
  }
  window.onmouseup=function(){
   YY = null;
   return true;
  }
  function fun(y){
   if(top_x>=topX&&topX>=0&&YY!=null){
    topX = y-YY+topXX;
    if(topX<0)topX=0;
    if(topX>top_x)topX=top_x-1;
    thio.ribbit_OF_p2.style.top = (topX-1)+"px";
    dst = topX*vherght/top_x;
    thio.element.scrollTop = dst;
   }
  }
 }
 this.createp();
 this.addAudo();
}
new OverFlow(p_5);
</script>
</html>

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