jquery - 来自 AJAX 请求的 jqPlot ASP.NET 中的 dataRender

Question

我正在尝试从 AJAX 请求渲染 jqPlot 条形图，但无法让它工作。

我有以下 JavaScript 代码:

var ajaxDataRenderer = function (url, plot) {
   var ret = null;
   $.ajax({
      // have to use synchronous here, else returns before data is fetched
      async: false,
      url: url,
      contentType: "application/json; charset=utf-8",
      dataType: 'json',
      success: function (data) {
         ret = data;
      }
   });
   return ret;
};

var jsonurl = "WebService1.asmx/HelloWorld";

plo12 = $.jqplot('chart2', jsonurl, {
   title: 'AJAX JSON Data Renderer',
   dataRenderer: ajaxDataRenderer,
   seriesDefaults: {
      renderer: $.jqplot.BarRenderer,
      rendererOptions: {
         // Put a 30 pixel margin between bars.
         barMargin: 30,
         // Highlight bars when mouse button pressed.
         // Disables default highlighting on mouse over.
         highlightMouseDown: true
      },
      pointLabels: { show: true }
   },
   axes: {
      xaxis: {
         renderer: $.jqplot.CategoryAxisRenderer
      },
      yaxis: {
         // Don't pad out the bottom of the data range.  By default,
         // axes scaled as if data extended 10% above and below the
         // actual range to prevent data points right on grid boundaries.
         // Don't want to do that here.
         padMin: 0
      }
   },
   legend: {
      show: true,
      location: 'e',
      placement: 'outside'
   }
});

我的 WebService1.asmx 看起来像这样:

[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]

[System.ComponentModel.ToolboxItem(false)]
// To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line. 
[System.Web.Script.Services.ScriptService]
public class WebService1 : System.Web.Services.WebService {

    [WebMethod]
    [ScriptMethod(UseHttpGet = true, ResponseFormat = ResponseFormat.Json)]
    public string HelloWorld()
    {
        return "[[2],[7],[14]]";
    }
}

我见过this解决方案，但我对此很陌生，我不知道我的问题是什么。

Answer 1

我正在通过 GWT 使用这个 JQplot 库。确保您已经加载了 .JS 文件，例如 jquery.jqplot、bar 渲染等。我认为它会起作用，否则如果您已经检查过这一点，我可能是错的。