在Asp.Net中使用amChart统计图
怎么在自己的ASP.NET页面插入可动态更新的数据统计图呢？网上的资源倒是不少（Fusioncharts、amCharts……），在这些资源中有一个比较好用：amChart，这个工具很炫，还能与用户交互，其繁多的统计图样式和一目了然的图形数据，一定能让你在第一眼就喜欢上这个工具。我们先来看一些这个工具的统计图效果：
柱状统计图：
速度模拟：
曲线统计图：
曲线统计图2：
扇形统计图：
点状统计图：
还有很多不知道是什么的统计图：
（效果够炫吧，去官网上下载吧：www.amcharts.com/）
Amcharts官网上有很多Demo，而且是免费的。免费版本在使用的时候会在统计图的左上角显示Amcharts官网的链接。
下面我们看一个简单的例子(以JavaScript CHARTS Version 3.4.4 ( February 20, 2014 )版本为例)
去官网下载3.4.4版本然后解压，
在samples文件夹中找到_exporting_to_multiple_formats.html这个网页，源码中，
chartData这个JSON数组是显示的统计数据，动态生成这些数据就可以做到动态的显示我们所需要统计的数据。以下是我做的的一个修改后的一个例子，源码奉上：(本人新手，高手勿喷)
前台aspx页面代码：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="exporting.aspx.cs" Inherits="amchart_exporting" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>amCharts examples</title>
<link rel="stylesheet" href="css/style.css" type="text/css">
<script src="amcharts/amcharts.js" type="text/javascript"></script>
<script src="amcharts/serial.js" type="text/javascript"></script>
<!-- scripts for exporting chart as an image -->
<!-- Exporting to image works on all modern browsers except IE9 (IE10 works fine) -->
<!-- Note, the exporting will work only if you view the file from web server -->
<!--[if (!IE) | (gte IE 10)]> -->
<script src="amcharts/exporting/amexport.js" type="text/javascript"></script>
<script src="amcharts/exporting/rgbcolor.js" type="text/javascript"></script>
<script src="amcharts/exporting/canvg.js" type="text/javascript"></script>
<script src="amcharts/exporting/jspdf.js" type="text/javascript"></script>
<script src="amcharts/exporting/filesaver.js" type="text/javascript"></script>
<script src="amcharts/exporting/jspdf.plugin.addimage.js" type="text/javascript"></script>
<!-- <![endif]-->
</head>
<body>
<form id="form1" runat="server">
<span style="font-family: Arial; font-size: 10px; color: #CC0000;">
<p>警告：只能在浏览器端下载统计图表文件。除了IE9可以在任何浏览器上执行，在IE10上运行最佳。</p>
</span>
<div id="chartdiv" style="width: 100%; height: 400px;"></div>
</form>
</body>
</html>
对应的cs代码：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Text;
public partial class amchart_exporting : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
chartHelper get_js = new chartHelper();//帮助类
StringBuilder js = get_js.ChartJS();
Page.ClientScript.RegisterStartupScript(Page.GetType(), "message", js.ToString());
}
}
}
帮助类代码：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data;
using System.Data.SqlClient;
using System.Text;
/// <summary>
/// chartHelper 的摘要说明
/// </summary>
public class chartHelper
{
public chartHelper()
{
//
// TODO: 在此处添加构造函数逻辑
//
}
public StringBuilder ChartJS()
{
StringBuilder return_js = new StringBuilder();
DataTable chart_table = ChartData();
return_js.Append("<script type=\"text/javascript\">");
return_js.Append("var chart;");
return_js.Append("var chartData = [");
for (int i = 0; i < chart_table.Rows.Count; i++)
{
int TableCount = chart_table.Rows.Count;
int ColorCount = A_Colors().Count();
int yushu = i % ColorCount;
return_js.Append("{\"pagename\": \"" + chart_table.Rows[i]["pagename"].ToString() + "\",\"visits\": " + chart_table.Rows[i]["visits"].ToString() + ",\"color\": \"" + ChartColor(yushu) + "\"},");
}
return_js.Append("];");
return_js.Append("var chart = AmCharts.makeChart(\"chartdiv\", {");
return_js.Append("type: \"serial\",");
return_js.Append("dataProvider: chartData,");
return_js.Append("categoryField: \"pagename\",");
return_js.Append("depth3D: 20,");
return_js.Append("angle: 30,");
return_js.Append("categoryAxis: {labelRotation: 90,gridPosition: \"start\"},");
return_js.Append("valueAxes: [{title: \"访问次数\"}],");
return_js.Append("graphs: [{valueField: \"visits\",colorField: \"color\",type: \"column\",lineAlpha: 0,fillAlphas: 1 }],");
return_js.Append("chartCursor: {cursorAlpha: 0,zoomable: false,categoryBalloonEnabled: false},");
return_js.Append("exportConfig: {menuTop: \"21px\",menuBottom: \"auto\",menuRight: \"21px\",backgroundColor: \"#efefef\",menuItemStyle: {backgroundColor: '#EFEFEF',rollOverBackgroundColor: '#DDDDDD'},");
return_js.Append("menuItems: [{textAlign: 'center',icon: 'amcharts/images/export.png',onclick: function () { },");
return_js.Append("items: [{title: 'JPG',format: 'jpg'}, {title: 'PNG',format: 'png'}, {title: 'SVG',format: 'svg'}, {title: 'PDF',format: 'pdf'}]");
return_js.Append("}] } });");
return_js.Append("</script>");
return return_js;
}
public DataTable ChartData()
{
DataTable dt = new DataTable();
dt.Columns.Add("pagename", System.Type.GetType("System.String"));
dt.Columns.Add("visits", System.Type.GetType("System.String"));
Random ran = new Random();
for (int i = 0; i < 20; i++)
{
DataRow dr = dt.NewRow();
dr["pagename"] = "页面" + (i + 1).ToString();
int value = ran.Next(1, 5000);
dr["visits"] = value.ToString();
dt.Rows.Add(dr);
}
return dt;
}
public string[] A_Colors()
{
string[] Arry_Colors = new string[] {
"#FF0F00",
"#FF6600",
"#FF9E01",
"#FCD202",
"#F8FF01",
"#B0DE09",
"#04D215",
"#0D8ECF",
"#0D52D1",
"#2A0CD0",
"#8A0CCF",
"#CD0D74",
"#754DEB",
"#DDDDDD",
"#999999",
"#333333",
"#000000"
};
return Arry_Colors;
}
public string ChartColor(int num)
{
string[] Colors = A_Colors();
if (num > 0 && num < Colors.Count())
{
return Colors[num];
}
else
{
return "#FF0F00";
}
}
}
