Question

我试图在Google Charts中显示一些数据，但却收到此错误：

Data column(s) for axis #0 cannot be of type string..

我有这个类的两个属性：

public class GAStatistics
{
    public string Date { get; set; }
    public string Visitors { get; set; }
}

我从这个控制器传递了这些属性的列表：

public class GAStatisticsController : Controller
{

     //GET: /ShopStatistics/


    public ActionResult GetData()
    {
        return Json(CreateCompaniesList(), JsonRequestBehavior.AllowGet);
    }


    private IEnumerable<GAStatistics> CreateCompaniesList()
    {

        List<GAStatistics> ListGaVisitors = new List<GAStatistics>();

        foreach (var row in d.Rows)
        {

            GAStatistics GaVisits = new GAStatistics(row[0], row[1]);
            ListGaVisitors.Add(GaVisits);
        }


        return ListGaVisitors;

    }

}

对于我从控制器传递列表的这个视图：

<script type="text/javascript" src="https://www.google.com/jsapi"></script>

    <script type="text/javascript">

        google.load("visualization", "1", { packages: ["corechart"] });
        google.load("visualization", "1", { packages: ["treemap"] });
        google.setOnLoadCallback(drawChart);
        function drawChart() {
            $.get('/GAStatistics/GetData', {},
                function (data) {
                    var tdata = new google.visualization.DataTable();

                    tdata.addColumn('string', 'Date');
                    tdata.addColumn('string', 'Visitors');


                    for (var i = 0; i < data.length; i++) {
                        //tdata.addRow([data[i].Year, data[i].Salary, data[i].Expense]);
                        tdata.addRow([data[i].Date, data[i].Visitors]);
                    }



                    var options = {
                        title: "Expenses, salary For the current year"
                    };

                    var chart1 = new google.visualization.AreaChart(document.getElementById('chart_div1'));

                    chart1.draw(tdata, options);

                });


        }
    </script>

有什么想法吗？

Answer 1

我测试了您的示例并发现主要问题是因为第二列Visitors应该是数字而不是字符串。

我已在tdata.addColumn('number', 'Visitors');行中替换了列类型，并在循环中添加了parseInt：

tdata.addColumn('date', 'Date');
tdata.addColumn('number', 'Visitors');

// sample data: var data = [{ Date: "20140124", Visitors: "873" }, { Date: "20140125", Visitors: "875" }];
for (var i = 0; i < data.length; i++) {
    var dateStr = data[i].Date.substr(0, 4) + "-" + data[i].Date.substr(4,2) + "-" + data[i].Date.substr(6,2);
    tdata.addRow([new Date(dateStr), parseInt(data[i].Visitors)]);
}

此外，第一列Date可能仍为string，但我将其类型替换为date并添加了new Date转换。

轴＃0的数据列不能是字符串类型 - Google Charts

1 个答案: