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JavaScript实现的DOM绘制柱状图效果示例

程序员文章站 2022-04-04 14:54:50
本文实例讲述了javascript实现的dom绘制柱状图效果。分享给大家供大家参考，具体如下：

本文实例讲述了javascript实现的dom绘制柱状图效果。分享给大家供大家参考，具体如下：

<!doctype html>
<html>
  <head>
  <meta http-equiv="content-type" content="text/html; charset=utf-8" />
    <title>www.jb51.net javascript dom绘制柱状图</title>
    <style>
      #chart-wrap{ 
        width:910px; 
        height:240px;
        border:solid 1px #b3b3dc;
        position:relative; 
        top:40px; 
        left:20px;
      } 
    </style>
  </head>
  <body>
    <div id="chart-wrap"></div>
    <script>
      function renderchart(data) {
        var cw = document.getelementbyid("chart-wrap"); 
        cw.innerhtml = ""; 
        var max = 0; 
        for (var index in data) {
          if (data[index] > max)
            max = data[index];
        }
        var percent = 180 / max; 
        var i = 0;
        for (var index in data) { 
          var bar = document.createelement("div"); 
          bar.id = index + "_" + data[index]; 
          bar.style.height = math.round(percent * data[index]) + "px"; 
          bar.style.width = "40px";
          bar.style.left = (i * 40) + 165 + "px"; 
          bar.style.marginleft = (i * 20) + "px"; 
          bar.style.position = "absolute"; 
          bar.style.background = "none repeat scroll 0 0 pink";
          bar.style.overflow = "hidden";
          bar.setattribute("title", index + "：" + data[index]);
          bar.style.display = "block"; 
          bar.style.top = 200 - math.round(percent * data[index]) + "px"; 
          cw.appendchild(bar); 
          var axis = document.createelement("div"); 
          axis.id = "axis_" + i; 
          axis.style.width = "40px"; 
          axis.style.left = (i * 40) + 165 + "px"; 
          axis.style.marginleft = (i * 20) + "px";
          axis.style.textalign = "center"; 
          axis.style.position = "absolute"; 
          axis.style.top = "205px"; 
          axis.innerhtml = '<span style="font-size:12px; color:grey;"> ' + i + '</span>'; 
          cw.appendchild(axis); 
          i++;
        }   
        for (var i = 0; i < 5; i++) { 
          var ayis = document.createelement("div"); 
          ayis.style.width = "30px"; 
          ayis.style.position = "absolute"; 
          ayis.style.top = (36 * i) + (20 - 6) + "px"; 
          ayis.style.left = "140px"; 
          ayis.innerhtml = '<span style="font-size:12px; color:grey;"> ' + math.round(max - (max / 5) * i) + '</span>'; 
          cw.appendchild(ayis); 
          var line = document.createelement("div"); 
          line.setattribute("style", "width:580px; left:165px; border-top:1px dotted grey; height:1px; line-height:1px; display:block; overflow:hidden; position:absolute; "); 
          line.style.top = (36 * i) + 20 + "px"; 
          cw.appendchild(line); 
        } 
      }
      var data = [10,60,50,30,40,80,20,70,100,90];
      renderchart(data);
    </script>
  </body>
</html>

运行效果如下：

JavaScript实现的DOM绘制柱状图效果示例

更多关于javascript相关内容感兴趣的读者可查看本站专题：《javascript操作dom技巧总结》、《javascript错误与调试技巧总结》、《javascript数据结构与算法技巧总结》、《javascript遍历算法与技巧总结》及《javascript数学运算用法总结》

希望本文所述对大家javascript程序设计有所帮助。

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