Asp.net chart

Question

User-1706751376 posted

Hi, I have a bar chart. Its shows data with 3 bars .. I want to get the specific value which it display when i click over it.. for eg if my bar chart is showing 3 bars with value A,B and C. When I click on the bar with value C.. i want to capture this value in C# code.. any halp would be appriciated ..

right now i am able to capture its value like 

protected void chart2_Click(object sender, ImageMapEventArgs e)
{
if (e.PostBackValue == "item")
{string fault = chart2.Series["Series1"].Points[0].AxisLabel;}}

but since it is always getting value of first barchart (Point[0])... i am not sure how to get the value of the bar chart item where i clicked ..

please help .. please also let me know if there is any confusion .thanks 

Answer 1

User61956409 posted

Hi vishvishvish,

You could try to add PostBackValue to the chart series, the following sample is for your reference.

<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
<asp:Chart ID="Chart1" runat="server" OnClick="Chart1_Click">
    <Series>
        <asp:Series Name="Series1"></asp:Series>
    </Series>
    <ChartAreas>
        <asp:ChartArea Name="ChartArea1"></asp:ChartArea>
    </ChartAreas>
</asp:Chart>

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        DataTable dt = new DataTable();
        dt.Columns.Add("FName");
        dt.Columns.Add("FVal");

        dt.Rows.Add("A", 180);
        dt.Rows.Add("B", 156);
        dt.Rows.Add("C", 203);

        Chart1.Series[0].ChartType = System.Web.UI.DataVisualization.Charting.SeriesChartType.Bar;
        Chart1.Series[0].XValueMember = "FName";
        Chart1.Series[0].YValueMembers = "FVal";

        Chart1.Series[0].PostBackValue = "#VALY";

        Chart1.DataSource = dt;
        Chart1.DataBind();
    }
}

protected void Chart1_Click(object sender, ImageMapEventArgs e)
{
    string val = e.PostBackValue;
    Label1.Text = val;
}

Best Regards,

Fei Han

Answer 2

User-1706751376 posted

thanks . i will try and will let you know .. appreciate your reply .