Javascript implements disabling mouse wheel events_javascript skills-JS Tutorial-php.cn

Javascript implements disabling mouse wheel events_javascript skills

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Release： 2016-05-16 15:49:19

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We usually adjust the compatibility of lower versions of IE when it comes to compatible things, but this time it’s not because the lower version of the browser is incompetent. It's because Firefox has gone too far and completely disregards the experience of other browsers. All browsers except Firefox can use the MouseWheel event to handle the response of the mouse wheel. However, Firefox does not support MouseWheel, and uses the nonsensical DOMMouseScroll, which is not compatible with other browsers except Firefox. In other words, for handling mouse wheel events, Firefox can only use DOMMouseScroll. Non-Firefox can only use MouseWheel. The principles of these two events are different, and the data they process is also different.

var firefox = navigator.userAgent.indexOf('Firefox') != -1;
firefox &#63; img.addEventListener('DOMMouseScroll', MouseWheel, false) : 
     (img.onmousewheel = MouseWheel);
 
  function MouseWheel(e) {
    e = e || window.event;
 
    if (e.stopPropagation) e.stopPropagation();
    else e.cancelBubble = true;
     
    if (e.preventDefault) e.preventDefault();
    else e.returnValue = false;
 
  }

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Let’s take a look at the complete code

<!DOCTYPE html>
<style>
span {font:14px/20px 微软雅黑;}
#counter {
 width:50px;height:20px;
 border:1px solid #CCC;
 background:#F9F9F9;
 font:14px/20px Consolas;
 text-align:center;
 margin:10px;
}
</style>
<span>使用鼠标滚轮调整数值大小</span><br/>
<div id="counter">0</div>
<script>
//判断浏览器
var isIE=navigator.userAgent.match(/MSIE (\d)/i);
isIE=isIE&#63;isIE[1]:undefined;
var isFF=/FireFox/i.test(navigator.userAgent);
//获取元素
var counter=document.getElementById("counter");
//鼠标滚轮事件
if(isIE<9) //传统浏览器使用MouseWheel事件
 counter.attachEvent("onmousewheel",function(){
  //计算鼠标滚轮滚动的距离
  //一格3行，每行40像素，所以除以120
  var v=event.wheelDelta/120;
  counter.innerHTML=counter.innerHTML*1+v;
  //阻止浏览器默认方法
  return false;
 });
else if(!isFF) //除火狐外的现代浏览器也使用MouseWheel事件
 counter.addEventListener("mousewheel",function(e){
  //计算鼠标滚轮滚动的距离
  var v=e.wheelDelta/120;
  counter.innerHTML=counter.innerHTML*1+v;
  //阻止浏览器默认方法
  e.preventDefault();
 },false);
else //奇葩的火狐使用DOMMouseScroll事件
 counter.addEventListener("DOMMouseScroll",function(e){
  //计算鼠标滚轮滚动的距离
  //一格是3行，但是要注意，这里和像素不同的是它是负值
  var v=-e.detail/3;
  counter.innerHTML=counter.innerHTML*1+v;
  //阻止浏览器默认方法
  e.preventDefault();
 },false);
</script>

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