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Open Flash Chart 2

apelagenko posted on January 17, 2009 15:37

I've already written about the Open Flash Chart and ASP.NET library to work with it. Since that time the version 2 of the flash component has been released. The flash component now uses JSON format of data, some new types of charts has been added such as horizontal bar chart and there are other “cool new features”.

The great work was done this post. The author adapted the library to use JSON format also added support of some new chart types as well as new properties. All I've done after it it just some refactoring testing, and bugfixing the library to support all the chart types.

I added two examples of lib usage in the project: the static 2 charts on page and the page with a chart inside UpdatePanel control to show how to properly embed in that case. The demo pages are here. The source can be downloaded from codplex (VS2008 solution).

The second chart on the default.aspx page uses a custom data page and does not use ASP.NET cache. The control property SpecificDataHandler is designed to set the custom data page

<OpenFlash:OpenFlashChartControl runat="server" ID="ofcTest2" Height="350" Width="500" OnDrawChart="DrawChart" SpecificDataHandler="FlashData.aspx"/>

The FlashData.aspx is an ordinal ASP.NET page with nothing in aspx file and a code which simply builds and flushes an Graph object in the codebehind.

public partial class FlashData : System.Web.UI.Page
{
    protected override void Render(HtmlTextWriter writer)
    {
        Graph g = new Graph();
        g.Title = new Title("Bar Chart");
        var bar = new BarSketch(3);
        Random random = new Random();
        bar.Fillalpha = 0.4;
        bar.Text = "Test";
        bar.Fontsize = 10;
        int max = int.MinValue;
        for (int i = 0; i < 12; i++)
        {
            int value = random.Next(i, i * 2);
            if (value > max)
                max = value;
            var val = bar.NewValue(i.ToString(), value);
            bar.Values.Add(val);
        }
        g.AddElement(bar);
        g.OnBuildComplete();
        writer.Write(g.ToPrettyString());
    }
}

This approach is useful for web farms.

If you made a bug in the JSON you’ll have the most common Error #2032 which means that the data for the chart can not be loaded. To solve it the chart has properties DataHandlerUrl and SpecificDataHandler and you can exactly specify the HttpHandler or the specific data handler address.

Comments

Twain

February 12. 2009 08:47

Can´t unzip the files from OpenFlashChart2Lib0.9.zip.
Broken zip?

apelagenko

February 15. 2009 15:51

My 7z archiver made a zip using some strange method of compression. I've put a new one zip at the codeplex. Seems that this time it is ok.

mourbare

June 9. 2009 10:16

For my Project, i actually use Open Flash Chart and ASP.net MVC. is it possible to use SpecificDataHandler with a Code File C#. I mean for Exple: 1. <OpenFlash:OpenFlashChartControl runat="server" ID="ofcTest2" Height="350" Width="500" OnDrawChart="DrawChart" SpecificDataHandler="FlashData.cs"/>

John Croson

July 16. 2009 16:35

Hi, hope you or a follower can assist me...

I'm a .Net noob, and want to try to get this working on our DNN site.

I've got a VWD 2008 environment running, and have the assembly installed, but when I use it, I get the dreaded 2032 error. I know it's due to lack of data, but can't figure out what I'm doing wrong.

Can you help me?

My VB .Net page has the pertinent lines:
<%@ Register Assembly="OpenFlash" Namespace="OpenFlash.Controls" TagPrefix="OpenFlashChart" %>
<OpenFlashChart:OpenFlashChartControl ID="vsChart" runat="server">
</OpenFlashChart:OpenFlashChartControl>

I simply added the assembly to my toolbar and dragged it onto a new page.

My VB code behind is:
Imports System
Imports System.Collections.Generic
Imports System.Linq
Imports System.Web
Imports System.Web.UI
Imports System.Web.UI.WebControls
Imports OpenFlash
Imports OpenFlash.Charts
Imports OpenFlash.Controls
Imports Bar = OpenFlash.Charts.Bar

Partial Class VitalSigns_vitalsigns
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
vsChart.BuildChart()
End Sub

Protected Sub DrawChart(ByVal sender As Object, ByVal e As DrawChartEventArgs)
Dim chart As New OpenFlashChart()
chart.Title = New Title("Bar Chart")

Dim bar As New Bar()
Dim random As New Random()
bar.Colour = "#345"

bar.Fillalpha = 0.4
bar.Text = "Test"

bar.Fontsize = 10
Dim values As New List(Of Double)()
For i As Integer = 0 To 11
values.Add(random.[Next](i, i * 2))
Next
bar.Values = values
chart.AddElement(bar)

e.Graph = chart
End Sub
End Class

I have a Flash directory with the open-flash-chart.swf file in it.

Not sure what else I should be doing to avoid this IO Error...

TIA!!!!

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