Complete example of jQuery custom scroll bar

Complete example of jQuery custom scroll bar_jquery

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Release： 2016-05-16 15:21:04

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The example in this article describes the implementation method of jQuery custom scroll bar. Share it with everyone for your reference, the details are as follows:

Many times, due to aesthetic considerations, it is often necessary to customize various scroll bars. Therefore, I made a demo

The screenshot of the running effect is as follows:

The following is the code part:

<html>
  <head>
    <script type="text/javascript" src="jquery-1.9.1.min.js"></script>
    <script>
    $(function(){
      //内容高度
      var content = $("#div2"); 
      //框的高度
      var box = $("#div1");
      //自定义的滚动条
      var scrollbar = $("#div3");
      var scroll=function(content,box,scrollbar){
        var bigHeight = content.height();
        var smallHeight = box.height();
        var rate = smallHeight/bigHeight;
        var h = Math.floor(rate*smallHeight);
        scrollbar.height(h);
        var offset = box.offset()
        var offsetT = offset.top+1;
        scrollbar.mousedown(function(e){
          var divOffsetT = scrollbar.offset().top;
          var tempT = e.pageY-divOffsetT;
          function move(e){
            var newH = e.pageY-tempT-offsetT;
            if(newH<0){
              newH=0;
            }else if(newH>(smallHeight-h)){
              newH=smallHeight-h;
            }
            var rate2 = (newH+h)/smallHeight;
            var contentH = Math.floor(bigHeight*rate2-smallHeight);
            content.css("top",-contentH+"px");
            scrollbar.css("top",newH+"px");
          }
          $("body").on("mousemove",move);
          $("body").mouseup(function(){
            $("body").off("mousemove",move);
          });
        });
      }
      scroll(content,box,scrollbar);
    });
    </script>
    <style>
      *{ margin:0; padding: 0;}
      body{ font-size: 12px;}
      #div1{ width: 200px; height: 300px; margin: 50px auto; position: relative; _overflow: hidden; border: 1px solid #000;}
      #div2{ width: 180px; position: absolute; top: 0; left: 5px;}
      #div3{ width: 10px; position: absolute; top: 0; right:5px; background: #000;}
    </style>
  </head>
  <body>
    <div id="div1">
      <div id="div3"></div>
      <div id="div2">
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      </div>
    </div>
    <textarea name="" id="txt" cols="30" rows="10"></textarea>
  </body>
</html>

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I hope this article will be helpful to everyone in jQuery programming.