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JavaScript method to implement rolling news_javascript skills

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May 16, 2016 pm 03:48 PM

javascript

The example in this article describes the method of implementing rolling news in javaScript. Share it with everyone for your reference. The details are as follows:

The rolling_new.html page is as follows:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
 <head>
 <title> New Document </title>
 <meta name="Generator" content="EditPlus">
 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 <meta name="Author" content="">
 <meta name="Keywords" content="">
 <meta name="Description" content="">
 </head>
 <style type="text/css">
 *{margin:0;padding:0;}
 #news{display:none;}
 </style>
 <body>
 <div id="news">
 太平天国医疗卫生组织，在国家制度上，有一定的组织，已经形成为一
种正规化的制度。它可分为朝内、军中、居民三个系统。
种正规化的制度。它可分为朝内、军中、居民三个系统。
种正规化的制度。它可分为朝内、军中、居民三个系统。
种正规化的制度。它可分为朝内、军中、居民三个系统。种正规化的制度。它可分为朝内、军中、居民三个系统。种正规化的制度。它可分为朝内、军中、居民三个系统。种正规化的制度。它可分为朝内、军中、居民三个系统。种正规化的制度。它可分为朝内、军中、居民三个系统。种正规化的制度。它可分为朝内、军中、居民三个系统。种正规化的制度。它可分为朝内、军中、居民三个系统。
 </div>
 <div id="show_news">
 </div>
 </body>
 <script type="text/javascript">
 function $(node){
  return document.getElementById(node);
 }
 function getElementsByClassName(str,root,tag){
   if(root){
    root=typeof root=="string"&#63;document.getElementById(root):root;
   }else{
    root=document.body;
   }
   tag=tag||"*";
   var els=root.getElementsByTagName(tag),arr=[];
   for(var i=0,n=els.length;i<n;i++){
    for(var j=0,k=els[i].className.split(" "),l=k.length;j<1;j++){
     if(k[j]==str){
      arr.push(els[i]);
      break;
     }
    }
   }
   return arr;
 }
 function attachEvent(node,eventType,handler){
  node=typeof node=="string"&#63;document.getElementById(node):node;
  if(document.all){
   node.attachEvent("on"+eventType,handler);
  }else{
   node.addEventListener(eventType,handler,false);
  }
 }
 function rolling_news(source,target,width,height,speed,direction){
  this.source=$(source);
  this.source_content=$(source).innerHTML;
  this.target=$(target);
  this.width=width;  //宽
  this.height=height;  //高
  this.speed=speed;  //滚动速度
  this.direction=direction;//方向
  this.tag=0;  
 }
 rolling_news.prototype={
  version:"1.00",
  author:"yangfeifei",
  date:"2011-10-23",
  initialize:function(){
   var o=this;
   var target=o.target;
   var content=o.source_content;
   var innerDiv=document.createElement("div");
   innerDiv.setAttribute("class","innerDiv");
   o.source.innerHTML="";
   innerDiv.innerHTML=o.source_content;
   target.appendChild(innerDiv);  
   //显示区域样式
   target.style.width=o.width+"px";
   target.style.height=o.height+"px";
   target.style.overflow="hidden";
   target.getElementsByTagName('div')[0].style.width=o.width+"px";
   target.getElementsByTagName('div')[0].style.height=target.getElementsByTagName('div')[0].scrollHeight>o.height&#63;target.getElementsByTagName('div')[0].scrollHeight+"px":o.height+"px";//当文档实际高度大于容器时，高度为实际文档高度，否则为容器高度
   //显示区域初始化
   switch(o.direction){
    case "up":
    target.scrollTop="0";
    o.addAfterNode();
    break;
    case "down":
    o.addBeforeNode();
    target.scrollTop=target.scrollHeight-o.height;
    break;
   }   
   //初始动作    
   o.autoplay();
   attachEvent(o.target,'mouseover',function(){o.stop()});
   attachEvent(o.target,'mouseout',function(){o.autoplay()});
  },
  up:function(){
   var x=this;
   var divHeight=x.target.getElementsByTagName('div')[0].scrollHeight>x.height&#63;x.target.getElementsByTagName('div')[0].scrollHeight:x.height;
   if((x.target.scrollHeight-x.target.scrollTop)!=x.height){
     x.target.scrollTop=x.tag;
   }else{
    x.addAfterNode();
    x.target.removeChild(x.target.getElementsByTagName('div')[0]);    
    x.tag=x.tag-divHeight;
    x.target.scrollTop=x.tag;     
   }
   x.tag=x.tag+x.speed;
  },
  down:function(){
   var j=this;
   var divHeight=j.target.getElementsByTagName('div')[0].scrollHeight>j.height&#63;j.target.getElementsByTagName('div')[0].scrollHeight:j.height;
   if(j.target.scrollTop==0){
    j.addBeforeNode();
    j.target.removeChild(j.target.getElementsByTagName('div')[2]); 
    j.tag=j.tag-divHeight;
    j.target.scrollTop=j.target.scrollHeight-j.height-j.tag;
   }else{
    j.target.scrollTop=j.target.scrollHeight-j.height-j.tag;
   }
   j.tag=j.tag+j.speed;
  },
  addAfterNode:function(){
   var p=this;
   var newDiv=document.createElement('div');
   newDiv.setAttribute("class","innerDiv");
   newDiv.innerHTML=p.source_content;
   p.target.appendChild(newDiv);
   newDiv.style.width=p.width+"px";
   newDiv.style.height=p.target.getElementsByTagName('div')[0].scrollHeight>p.height&#63;p.target.getElementsByTagName('div')[0].scrollHeight+"px":p.height+"px";//当文档实际高度大于容器时，高度为实际文档高度，否则为容器高度
  },
  addBeforeNode:function(){
   var d=this;
   var newDiv=document.createElement('div');
   newDiv.setAttribute("class","innerDiv");
   newDiv.innerHTML=d.source_content;
   d.target.insertBefore(newDiv,d.target.getElementsByTagName('div')[0]);
   newDiv.style.width=d.width+"px";
   newDiv.style.height=d.target.getElementsByTagName('div')[0].scrollHeight>d.height&#63;d.target.getElementsByTagName('div')[0].scrollHeight+"px":d.height+"px";//当文档实际高度大于容器时，高度为实际文档高度，否则为容器高度
  },
  play:function(){
   var t=this;     
   switch(t.direction){
    //向上
    case "up":
     t.up();
     break;
    //向右
    case "down": 
     t.down();
     break;     
   } 
  },
  autoplay:function(){
   var s=this;
   s.auto=setInterval(function(){s.play()},1);
  },
  stop:function(){
   var h=this;
   clearInterval(h.auto);
  }
 }
 var a=new rolling_news("news","show_news",200,200,1,"down");
 a.initialize();
 </script>
</html>

I hope this article will be helpful to everyone’s JavaScript programming design.

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