讲一下echarts的用法，列举了两个图表，一个是单柱图，一个是多柱图，至于饼状图，只许更改echarts的类型就好了
一、首先是要两个div，用来存放两个图表
<div class="div-frm" style="height: 275px; font-family: Microsoft YaHei, Verdana, Arial;"> <div id="barone" style=" 100%; height: 240px; float: left; font-family: Microsoft YaHei, Verdana, Arial;"></div> </div> <div style="height: 240px; font-family: Microsoft YaHei, Verdana, Arial;"> <div id="barthree" class="chart-container" style=" 100%; height: 240px; float: left; font-family: Microsoft YaHei, Verdana, Arial;"></div> </div>
二、需要用js从后台获取json数据（可以从cs页面获取，也可以通过一般处理程序，这里用的一般处理程序）
<%--单个柱状图--%>
<script type="text/javascript">
//初始化
var dom = document.getElementById("barone");
var myChart = echarts.init(dom);
var app = {};
option = null;
markPoint = null;
//图表使用
var option = {
title: {
text: '成绩图'
},
tooltip: {
trigger: 'axis'
},
toolbox: {
show: true,
feature: {
mark: { show: true },
dataView: { show: true, readOnly: false },
magicType: { show: true, type: ['line', 'bar'] },
restore: { show: true },
saveAsImage: { show: true }
}
},
calculable: true,
xAxis: [
{
type: 'category',
data: [""]
}
],
yAxis: [
{
type: 'value'
}
],
series: [
{
type: 'bar',
data: [""], //数据显示的地方，ajax
markPoint: {
data: [
{ type: 'max', name: '最大值' },
{ type: 'min', name: '最小值' }
]
},
markLine: {
data: [
{ type: 'average', name: '平均值' }
]
},
},
],
dataZoom: [
{
show: false,
start: 0,
end: 100
}
]
};
if (option && typeof option === "object") {
myChart.setOption(option, true);
}
//获取数据
$.ajax({
url: "echartsData/barone.ashx", //数据来源
data: { type: "bar" },
cache: false,
async: false,
dataType: 'json',
success: function (data) {
if (data) {
myChart.setOption({
xAxis: [{ data: data.xAxis }],
series: [
{
data: data.series,
itemStyle: { //显示柱状图顶部的数字
normal: {
color: '#2d9fd8',
label: {
show: true,
position: 'top',
textStyle: {
baseline: "bottom"
}
}
}
},
barWidth: 20
}
]
});
}
},
error: function (msg) {
alert("系统发生错误1");
}
});
</script>
<%-- 多个柱状图 --%>
<script type="text/javascript">
var dom = document.getElementById("barthree");
var myChart2 = echarts.init(dom);
var app = {};
option = null;
var option = {
title: {
text: '成绩表'
},
tooltip: {
trigger: 'axis'
},
legend: {
data: ['数学', '语文', '英语']
},
toolbox: {
show: true,
feature: {
mark: { show: true },
dataView: { show: true, readOnly: false },
magicType: { show: true, type: ['line', 'bar'] },
restore: { show: true },
saveAsImage: { show: true }
}
},
calculable: true,
xAxis: [
{
type: 'category',
data: [""]
}
],
yAxis: [
{
type: 'value'
}
],
series: [
{
name: '访问来源',
type: 'bar',
data: [""],
itemStyle: {
normal: {
color: '#2d9fd8',
label: {
show: true,
position: 'top',
textStyle: {
baseline: "bottom"
}
}
}
},
markPoint: {
data: [
{ type: 'max', name: '最大值' },
{ type: 'min', name: '最小值' }
]
},
markLine: {
data: [
{ type: 'average', name: '平均值' }
]
},
}
],
dataZoom: [
{
show: false,
start: 0,
end: 100
}
]
};
if (option && typeof option === "object") {
myChart2.setOption(option, true);
}
$.ajax({
url: "echartsData/barthree.ashx",
data: { type: "bar" },
cache: false,
async: false,
dataType: 'json',
success: function (data) {
if (data) {
myChart2.setOption({
legend: [{ data: data.legend }],
xAxis: [{ data: data.xAxis }],
series: data.series
});
}
},
error: function (msg) {
alert("系统发生错误");
}
});
</script>
三、在后台，从数据库读取数据
static string conStr = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString; JavaScriptSerializer jsS = new JavaScriptSerializer(); List<object> seriesList = new List<object>(); List<string> xAxisList = new List<string>(); string result = ""; public void ProcessRequest(HttpContext context) { string command = context.Request["type"]; switch (command) { case "bar": GetOverView(context); break; }; } public void GetOverView(HttpContext context) { using (SqlConnection conn = new SqlConnection()) { conn.ConnectionString = conStr; conn.Open(); string sql = "select * from Achievement"; SqlDataAdapter myda = new SqlDataAdapter(sql, conStr); DataTable dt = new DataTable(); // 实例化数据表 myda.Fill(dt); // 保存数据 foreach (DataRow dr in dt.Rows) { xAxisList.Add(dr["Name"].ToString()); seriesList.Add(dr["Math"].ToString()); } var newObj = new { xAxis = xAxisList, series = seriesList }; jsS = new JavaScriptSerializer(); result = jsS.Serialize(newObj); context.Response.Write(result); conn.Close(); // 关闭数据库连接 } }
static string conStr = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString; JavaScriptSerializer jsS = new JavaScriptSerializer(); List<object> seriesList = new List<object>(); List<string> xAxisList = new List<string>(); List<string> legendList = new List<string>(); string result = ""; public void ProcessRequest(HttpContext context) { string command = context.Request["type"]; switch (command) { case "bar": GetOverView(context); break; }; } public void GetOverView(HttpContext context) { using (SqlConnection conn = new SqlConnection()) { conn.ConnectionString = conStr; conn.Open(); string sql = "select * from Achievement"; SqlDataAdapter myda = new SqlDataAdapter(sql, conStr); DataTable dt = new DataTable(); // 实例化数据表 myda.Fill(dt); // 保存数据 legendList.Add("数学"); legendList.Add("语文"); legendList.Add("英语"); //设置对应的Series信息 Series UVSeriesObj = new Series(); UVSeriesObj.name = "数学"; UVSeriesObj.type = "bar"; //图呈现 UVSeriesObj.data = new List<object>(); Series UIPSeriesObj = new Series(); UIPSeriesObj.name = "语文"; UIPSeriesObj.type = "bar"; //图呈现 UIPSeriesObj.data = new List<object>(); Series PVSeriesObj = new Series(); PVSeriesObj.name = "英语"; PVSeriesObj.type = "bar"; //图呈现 PVSeriesObj.data = new List<object>(); foreach (DataRow dr in dt.Rows) { xAxisList.Add(dr["Name"].ToString()); UVSeriesObj.data.Add(dr["Math"]); UIPSeriesObj.data.Add(dr["Chinese"]); PVSeriesObj.data.Add(dr["English"]); } seriesList.Add(UVSeriesObj); seriesList.Add(UIPSeriesObj); seriesList.Add(PVSeriesObj); var newObj = new { legend = legendList, //三门学科 xAxis = xAxisList, series = seriesList }; jsS = new JavaScriptSerializer(); result = jsS.Serialize(newObj); context.Response.Write(result); } } public bool IsReusable { get { return false; } } class Series { /// <summary> /// series序列组名称 /// </summary> public string name { get; set; } /// <summary> /// series序列组呈现图表类型(line、column、bar等) /// </summary> public string type { get; set; } /// <summary> /// series序列组的数据为数据类型数组 /// </summary> public List<object> data { get; set; } }
echarts官方api文档：http://echarts.baidu.com/echarts2/doc/example.html