我使用 AJAX 从 SQL Server 获取数据，然后准备一个 js 数组用作图表中的数据。
AJAX 成功后的 JavaScript 代码：
...,
success: function (data) {
var fseries = [];
var series = [];
for (var arr in data) {
for (var i in data[arr]['data'] ){
var d = data[arr]['data'][i];
//if (i < 5) alert("d.method = " + d.method);
var serie = {x:Date.parse(d.Value), y:d.Item, method:d.method };
series.push(serie);
}
fseries.push({name: data[arr]['name'], data: series, location: data[arr]['location']});
series = [];
};
DrawChart(fseries);
},
现在在工具提示中显示额外的元数据：
...
tooltip: {
xDateFormat: '%m/%d/%y',
headerFormat: '<b>{series.name}</b><br>',
pointFormat: 'Method: {point.method}<br>Date: {point.x:%m/%d/%y } <br>Reading: {point.y:,.2f}',
shared: false,
},
我使用 DataRow 来遍历我的结果集，然后在以 Json 格式传回之前使用一个类来分配值。这是 Ajax 调用的控制器动作中的 C# 代码。
public JsonResult ChartData(string dataSource, string locationType, string[] locations, string[] methods, string fromDate, string toDate, string[] lstParams)
{
List<Dictionary<string, object>> dataResult = new List<Dictionary<string, object>>();
Dictionary<string, object> aSeries = new Dictionary<string, object>();
string currParam = string.Empty;
lstParams = (lstParams == null) ? new string[1] : lstParams;
foreach (DataRow dr in GetChartData(dataSource, locationType, locations, methods, fromDate, toDate, lstParams).Rows)
{
if (currParam != dr[1].ToString())
{
if (!String.IsNullOrEmpty(currParam)) //A new Standard Parameter is read and add to dataResult. Skips first record.
{
Dictionary<string, object> bSeries = new Dictionary<string, object>(aSeries); //Required else when clearing out aSeries, dataResult values are also cleared
dataResult.Add(bSeries);
aSeries.Clear();
}
currParam = dr[1].ToString();
aSeries["name"] = cParam;
aSeries["data"] = new List<ChartDataModel>();
aSeries["location"] = dr[0].ToString();
}
ChartDataModel lst = new ChartDataModel();
lst.Value = Convert.ToDateTime(dr[3]).ToShortDateString();
lst.Item = Convert.ToDouble(dr[2]);
lst.method = dr[4].ToString();
((List<ChartDataModel>)aSeries["data"]).Add(lst);
}
dataResult.Add(aSeries);
var result = Json(dataResult.ToList(), JsonRequestBehavior.AllowGet); //used to debug final dataResult before returning to AJAX call.
return result;
}
我意识到用 C# 编写代码有一种更有效和更可接受的方式，但我继承了该项目。