Exporting Chart

Exporting a chart can be done in both client-side and in server-side. This can be modified by setting values to the property “mode” in exporting. Default value for mode is client.

Client-side Exporting

In client-side rendered chart can be exported as PNG image or as SVG file.

  • Export as PNG - The chart can be exported to image when it is rendered in HTML5 Canvas. To render a chart in canvas, set the EnableCanvasRendering option to true. To export the chart, you can use the export method of the chart. Refer to the online KB link of exporting chart to know more about chart exporting.

  • Export as SVG - Chart can be exported as SVG if it is rendered as a scalable vector graphics element. By default chart will be rendered as SVG.

  • cshtml
  • <!--Chart download link-->
        <a id="download" style="cursor: pointer; position: absolute;right: 150px;">ExportChart</a>
    
            @(Html.EJ().Chart("container").ChartArea(area => area.Border(ab => ab.Color("transparent")))
                  .EnableCanvasRendering(true)
                  .ExportSettings(ex =>ex.FileName("ChartSnapshot").Type(ChartExportingType.PNG)))
    
        <script>
            function download() {
                var canvas = $("#container").ejChart("export");
                this.href = canvas;
            }
            if (document.getElementById('download').addEventListener)
                document.getElementById('download').addEventListener('click', download, false);
            else
                document.getElementById('download').attachEvent('onclick', download, false);
     </script>

    Click here to view the Export chart online demo sample.

    Server-side Exporting

    Server-side operations can be done at the controller page.

    Server side implementation

    To convert the chart data from client to server-side, refer to the following steps.

    1. Create an MVC application and add a controller.

    2. Add Syncfusion.EJ, Syncfusion.EJ.MVC, Syncfusion.EJ.Export, Syncfusion.XlsIO, Syncfusion.DocIO and Syncfusion.PDF.Base dll’s as references to the application.

    3. Specify the name of the method defined in the controller in the property “action” in exporting

    4. Currently, the chart data can be exported at server-side only through the helper functions in the “.Net”. So to use exporting in your projects, it is required to create a server with any of the following.

      i). ASP.NET MVC Controller

      ii). ASP.NET Web Form

      iii). WebAPI

      iv). WCF Service

  • cshtml
  • <!--Export Chart-->
            <button onclick="download()" value="Export">Export</button>
    
         @(Html.EJ().Chart("container").ChartArea(area => area.Border(ab => ab.Color("transparent")))
                  .EnableCanvasRendering(true)
                  .ExportSettings(ex => ex.Type(ChartExportingType.JPG).Action("ExportToImage").Mode(ChartExportingMode.Server))
                  )
    
        <script>
            //Export chart to excel
            function download() {
                $("#container").ejChart("export");
            }
    
        </script>

    At the server side the chart can be exported as JPG, PNG, SVG, PDF, word document and as excel documents. For this the following code have to place in the controller

  • csharp
  • public void ExportChart(string Data, string ChartModel)
            {
                // declaration
                ChartProperties obj = ConvertChartObject(ChartModel);
                string type = obj.ExportSettings.Type.ToString().ToLower();
                string fileName = obj.ExportSettings.FileName;
                string orientation = obj.ExportSettings.Orientation.ToString();
    
                if (type == "svg")      // for SVG export
                {
                    StringWriter oStringWriter = new StringWriter();
                    string data = HttpUtility.HtmlDecode(Data);
                    data = HttpUtility.UrlDecode(Data);
                    data = System.Uri.UnescapeDataString(Data);
                    oStringWriter.WriteLine(System.Uri.UnescapeDataString(Data));
                    Response.ContentType = "text/plain";
                    Response.AddHeader("Content-Disposition", String.Format("attachment;filename={0}", (obj.ExportSettings.FileName + ".svg")));
                    Response.Clear();
                    using (StreamWriter writer = new StreamWriter(Response.OutputStream))
                    {
                        data = oStringWriter.ToString();
                        writer.Write(oStringWriter.ToString());
                    }
                    Response.End();
                }
    
                else if (type == "xlsx")       // to export chart as excel
                {
                    List<ExportChartData> chartData = new List<ExportChartData>();
                    chartData.Add(new ExportChartData("John", 10));
                    chartData.Add(new ExportChartData("Jake", 12));
                    chartData.Add(new ExportChartData("Peter", 18));
                    chartData.Add(new ExportChartData("James", 11));
                    chartData.Add(new ExportChartData("Mary", 9.7));
    
                    ExcelExport exp = new ExcelExport();
                    exp.Export(obj, (IEnumerable)chartData, fileName + ".xlsx", ExcelVersion.Excel2010, null, null);
                }
    
                else
                {
                    Data = Data.Remove(0, Data.IndexOf(',') + 1);
                    MemoryStream stream = new MemoryStream(Convert.FromBase64String(Data));
    
                    if (type == "docx")        // to export as word document
                    {
                        WordDocument document = new WordDocument();
                        IWSection section = document.AddSection();
                        IWParagraph paragraph = section.AddParagraph();
                        if (obj.ExportSettings.Orientation.ToString() == "Landscape")
                            section.PageSetup.Orientation = PageOrientation.Landscape;
                        else
                            section.PageSetup.Orientation = PageOrientation.Portrait;
                        paragraph.AppendPicture(Image.FromStream(stream));
                        document.Save(fileName + ".doc", Syncfusion.DocIO.FormatType.Doc, HttpContext.ApplicationInstance.Response, Syncfusion.DocIO.HttpContentDisposition.Attachment);
                    }
                    else if (type == "pdf")      // to export as PDF
                    {
                        PdfDocument pdfDoc = new PdfDocument();
                        pdfDoc.Pages.Add();
                        if (obj.ExportSettings.Orientation.ToString() == "Landscape")
                            pdfDoc.Pages[0].Section.PageSettings.Orientation = PdfPageOrientation.Landscape;
                        else
                            pdfDoc.Pages[0].Section.PageSettings.Orientation = PdfPageOrientation.Portrait;
                        pdfDoc.Pages[0].Graphics.DrawImage(PdfImage.FromStream(stream), new PointF(10, 30));
                        pdfDoc.Save(obj.ExportSettings.FileName + ".pdf", HttpContext.ApplicationInstance.Response, HttpReadType.Save);
                        pdfDoc.Close();
                    }
                    else                        // to export as image
                    {
                        stream.WriteTo(Response.OutputStream);
                        Response.ContentType = "application/octet-stream";
                        Response.AddHeader("Content-Disposition", String.Format("attachment;filename={0}", fileName + "." + type));
                        Response.Flush();
                        stream.Close();
                        stream.Dispose();
                    }
                }
            }
          
            private ChartProperties ConvertChartObject(string ChartModel)
            {
                JavaScriptSerializer serializer = new JavaScriptSerializer();
                IEnumerable div = (IEnumerable)serializer.Deserialize(ChartModel, typeof(IEnumerable));
                ChartProperties chartProp = new ChartProperties();
                foreach (KeyValuePair<string, object> d in div)
                {
                    var property = chartProp.GetType().GetProperty(d.Key, BindingFlags.Instance | BindingFlags.Public | BindingFlags.IgnoreCase);
                    if (property != null)
                    {
                        Type type = property.PropertyType;
                        string serialize = serializer.Serialize(d.Value);
                        object value = serializer.Deserialize(serialize, type);
                       property.SetValue(chartProp, value, null);
                    }
                }
                return chartProp;
            }

    Excel Exporting

    Excel exporting is a server-side operation. In addition have to refer Syncfusion.XlsIO assembly to export as excel.

    Multiple Chart Excel Exporting

    EjChart supports exporting more than one charts in a page, with the third argument for the export method.

    NOTE

    Refer to the MultipleExportType.AppendToSheet, MultipleExportType.NewSheet.

  • cshtml
  • //Render Chart1
           $("#container1").ejChart();
    
           //Render Chart2
            $("#container2").ejChart();
    
           //Export multiple chart to excel
            function downloadExcel() {
                var chart = $("#container1").ejChart("instance");
                chart.export('Excel',
                          'http://js.syncfusion.com/ExportingServices/api/JSChartExport/ExcelExport', true);
            }

    Export multiple chart to excel at server-side

  • csharp
  • public class JSChartExportController : ApiController
            {
    
                [System.Web.Http.ActionName("ExcelExport")]
                [AcceptVerbs("POST")]
                public void ExcelExport()
                {
                    string chartModel = HttpContext.Current.Request.Params["ChartModel"];
                    IWorkbook book = null;
    
                    foreach (string chartProperty in ChartModel)
                    {
                        if (chartProperty != null)
                        {
                            ExcelExport exp = new ExcelExport();
    
                            ChartProperties obj = ConvertChartObject(chartProperty);
    
                            if (initial)
                            {
                                book = exp.Export((obj as ChartProperties), (IEnumerable)data, "Export1.xlsx",
                                                    ExcelVersion.Excel2010, true, null, null);
                                initial = false;
                            }
                            else
                            {
                                exp.Export((obj as ChartProperties), (IEnumerable)data, "Export.xlsx",
                               ExcelVersion.Excel2010, false, book, MultipleExportType.NewSheet, null, null);
                            }
                        }
                    }
                }
            }

    Naming the exported file

    EjChart provides options to customize the name of the file to be exported. This can be done by setting the name of the file to the property “fileName” in exporting.

    Rotating the chart

    We can also rotate the chart and can export it. Possible angles of rotation are 0, 90, -90 and 180 degree. This can be achieved by setting values to the “angle” property in exporting.

  • cshtml
  • @(Html.EJ().Chart("container")
                  .ExportSettings(ex => ex.Angle(180).Action("ExportToImage"))
          )

    Setting orientation for the document

    This is applicable for PDF, excel and word documents. By setting values to the “orientation” property in exporting, we can change the orientation of those documents. By default it will export with portrait orientation.