|
ashx是net提供的一般处理程序，比aspx返回的数据量少很多，适合做接口。
html代码：
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="echart2.aspx.cs" Inherits="RTC.echart2" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title> </title>
<!-- 引入 ECharts 文件 -->
<script src="scripts/echarts.common.min.js"></script>
<script src="scripts/jquery-1.10.2.min.js"></script>
<script src="scripts/json2.js"></script>
</head>
<body>
<form id="form1" runat="server">
<!-- 为 ECharts 准备一个具备大小（宽高）的Dom -->
<div id="main" style="width:1000px;height:400px;">
</div>
</form>
</body>
</html>
js代码：
<script type="text/javascript">
var varAxis;
var varSeries;
//var varRtcNO = $("#txtHid").val();
var varRtcNO = "35000002818";
var jdata;
var myChart = echarts.init(document.getElementById('main'));
// 显示标题，图例和空的坐标轴
myChart.setOption({
title: {
text: '温度曲线图'
},
tooltip: {
trigger: 'axis',
axisPointer: {
animation: false
},
formatter: function (params) {
return params[0].name + '<br />温度:' + params[0].value + '°C';
}
},
legend: {
data: ['温度']
},
xAxis: {
data: []
},
yAxis: {
axisLabel: {
formatter: '{value} °C'
},
min: 18,
max:30
},
series: [{
name: '温度',
type: 'line',
smooth: true,
data: []
}]
});
// 异步加载数据
$.ajax({
type: "post",
url: "getrtchistorydata.ashx?rtcno=" + varRtcNO,
dataType: "json",
success: function (data) {
var varReceiver = data;
//var varReceiver = jQuery.parseJSON(data);
var varAxis=new Array() ;
var varSeries = new Array(varReceiver.Count[0].total);
for (var i = 0; i < varReceiver.Count[0].total; i++) {
varAxis.push(varReceiver.Rows[i].RecordTime);
varSeries[i] = varReceiver.Rows[i].RoomTemp;
}
// 填入数据
myChart.setOption({
xAxis: {
data: varAxis
},
series: [{
//根据名字对应到相应的系列
name: '温度',
data: varSeries
}]
});
},
error: function (XMLHttpRequest, textStatus, errorThrown) {
alert(errorThrown);
}
});
</script>
url: "getrtchistorydata.ashx?rtcno=" + varRtcNO,就是服务端接收参数和返回数据的方法。
服务端方法：
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Web;
namespace RTC
{
/// <summary>
/// getrtchistorydata 的摘要说明
/// </summary>
public class getrtchistorydata : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/plain";
string strRTCNo = context.Request.QueryString["rtcno"].ToString();
SqlConnection con = new SqlConnection("server=192.168.0.222;uid=sa;pwd=hiwits;database=CeShi_QingDao;Max Pool Size=2048;");
SqlCommand cmd = new SqlCommand("select RtcNO,RoomTemp,InstallPlace,convert(varchar,RecordTime,120) as RecordTime,systime from RTCHistory where RtcNO='" + strRTCNo + "' order by InstallPlace,RecordTime", con);
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
da.Fill(ds);
string stbList = "";
stbList = "{\"Rows\":[";
foreach (DataRow dr in ds.Tables[0].Rows)
{
stbList = stbList + "{ \"RecordTime\":\"" + dr[3].ToString() + "\",";
stbList = stbList + " \"RoomTemp\":\"" + dr[1].ToString() + "\"},";
}
stbList = stbList.Substring(0, stbList.Length - 1);//去掉最后的一个逗号
stbList = stbList + "],";
stbList = stbList + "\"Count\":[{\"total\":" + ds.Tables[0].Rows .Count+ "}]";//用来记录一共返回了几条数据记录
stbList = stbList + "}";
context.htm = htm&(stbList.ToString());
}
public bool IsReusable
{
get
{
return false;
}
}
public void RetrunHistoryData()
{
}
}
}
其中，ajax的参数： dataType: "text",也可以是 dataType: "json",服务端在返回的时候，如果是json就序列化一下。请看参考。
在ajax成功后，反序列化一下就行。var varReceiver = jQuery.parseJSON(data);
|
