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JS Events

Demonstrates wiring up JS event function handlers to chart objects.

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<%@ Page Language="C#" Description="dotnetCHARTING Component" %>

<%@ Register TagPrefix="dnc" Namespace="dotnetCHARTING" Assembly="dotnetCHARTING" %>
<%@ Import Namespace="System.Drawing" %>
<%@ Import Namespace="System.Drawing.Drawing2D" %>
<%@ Import Namespace="dotnetCHARTING.Mapping" %>

<script runat="server">

void Page_Load(Object sender, EventArgs e)
{
// Demonstrates wiring up JS event function handlers to chart objects.

Chart.Size = "600x350";
//Chart.Title = ".netCHARTING Sample";
Chart.TempDirectory = "temp";
Chart.Debug = false;
Chart.JS.Enabled = true;

Chart.ChartArea.Label.Text = "Click the chart area, hover data points, and click legend entries.";

// Default Point Event
Chart.JS.Settings.Add("defaultPoint.events.mouseOver", "js:mouseHovering");
// Legend Entry Click Event
Chart.DefaultSeries.LegendEntry.Hotspot.Attributes.Custom.Add("click", "js:leClicked");
// ChartArea Click Event
Chart.ChartArea.Hotspot.Attributes.Custom.Add("click", "js:writeInfo");

// *DYNAMIC DATA NOTE*
// This sample uses random data to populate the chart. To populate
// a chart with database data see the following resources:
// - Use the getLiveData() method using the dataEngine to query a database.
// - Help File > Getting Started > Data Tutorials
// - DataEngine Class in the help file
// - Sample: features/DataEngine.aspx

SeriesCollection mySC = getRandomData();

// Add the random data.
Chart.SeriesCollection.Add(mySC);
}

SeriesCollection getRandomData()
{
Random myR = new Random(1);
SeriesCollection SC = new SeriesCollection();
for (int a = 1; a < 5; a++)
{
Series s = new Series("Series " + a.ToString());
for (int b = 1; b < 5; b++)
{
Element e = new Element("Element " + b.ToString());
e.YValue = myR.Next(50);
s.Elements.Add(e);
}
SC.Add(s);
}
return SC;
}

SeriesCollection getLiveData()
{
DataEngine de = new DataEngine(ConfigurationManager.AppSettings["DNCConnectionString"]);
de.ChartObject = Chart; // Necessary to view any errors the dataEngine may throw.
de.SqlStatement = "SELECT XAxisColumn, YAxisColumn FROM ....";
return de.GetSeries();
}

</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>.netCHARTING Sample</title>

<script type="text/javascript">
function mouseHovering() {
document.querySelector('#status').innerHTML = 'Mouse is over ' + this.name + ' with value of ' + this.y;
}
function leClicked() {
document.querySelector('#status').innerHTML = this.name+' Legend entry was clicked.';
}
function writeInfo(e) {
var str = '<b>Axis values at clicked position:</b><br/>X: ' + e.xAxis[0].value;
str += '<br/>Y: ' + e.yAxis[0].value;
document.querySelector('#status').innerHTML =str;
}
</script>
</head>
<style type="text/css">
div, p
{
font-family: Arial, Helvetica, sans-serif;
font-size: x-small;
}
</style>
<body>
<div align="center">
<dnc:Chart ID="Chart" runat="server" />
</div>
<div id="status"></div>
</body>
</html>

<%@ Page Language="vb" Description="dotnetCHARTING Component" %>

<%@ Register TagPrefix="dnc" Namespace="dotnetCHARTING" Assembly="dotnetCHARTING" %>
<%@ Import Namespace="System.Drawing" %>
<%@ Import Namespace="System.Drawing.Drawing2D" %>
<%@ Import Namespace="dotnetCHARTING.Mapping" %>

<script runat="server">

Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
' Demonstrates wiring up JS event function handlers to chart objects.

Chart.Size = "600x350"
'Chart.Title = ".netCHARTING Sample";
Chart.TempDirectory = "temp"
Chart.Debug = False
Chart.JS.Enabled = True

Chart.ChartArea.Label.Text = "Click the chart area, hover data points, and click legend entries."

' Default Point Event
Chart.JS.Settings.Add("defaultPoint.events.mouseOver", "js:mouseHovering")
' Legend Entry Click Event
Chart.DefaultSeries.LegendEntry.Hotspot.Attributes.Custom.Add("click", "js:leClicked")
' ChartArea Click Event
Chart.ChartArea.Hotspot.Attributes.Custom.Add("click", "js:writeInfo")

' *DYNAMIC DATA NOTE*
' This sample uses random data to populate the chart. To populate
' a chart with database data see the following resources:
' - Use the getLiveData() method using the dataEngine to query a database.
' - Help File > Getting Started > Data Tutorials
' - DataEngine Class in the help file
' - Sample: features/DataEngine.aspx

Dim mySC As SeriesCollection = getRandomData()

' Add the random data.
Chart.SeriesCollection.Add(mySC)
End Sub

Function getRandomData() As SeriesCollection
Dim myR As Random = New Random(1)
Dim SC As SeriesCollection = New SeriesCollection()
For a As Integer = 1 To 4
Dim s As Series = New Series("Series " & a.ToString())
For b As Integer = 1 To 4
Dim e As Element = New Element("Element " & b.ToString())
e.YValue = myR.Next(50)
s.Elements.Add(e)
Next b
SC.Add(s)
Next a
Return SC
End Function

Function getLiveData() As SeriesCollection
Dim de As DataEngine = New DataEngine(ConfigurationManager.AppSettings("DNCConnectionString"))
de.ChartObject = Chart ' Necessary to view any errors the dataEngine may throw.
de.SqlStatement = "SELECT XAxisColumn, YAxisColumn FROM ...."
Return de.GetSeries()
End Function

</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>.netCHARTING Sample</title>

<script type="text/javascript">
function mouseHovering() {
document.querySelector('#status').innerHTML = 'Mouse is over ' + this.name + ' with value of ' + this.y;
}
function leClicked() {
document.querySelector('#status').innerHTML = this.name+' Legend entry was clicked.';
}
function writeInfo(e) {
var str = '<b>Axis values at clicked position:</b><br/>X: ' + e.xAxis[0].value;
str += '<br/>Y: ' + e.yAxis[0].value;
document.querySelector('#status').innerHTML =str;
}
</script>
</head>
<style type="text/css">
div, p
{
font-family: Arial, Helvetica, sans-serif;
font-size: x-small;
}
</style>
<body>
<div align="center">
<dnc:Chart ID="Chart" runat="server" />
</div>
<div id="status"></div>
</body>
</html>

Sample FilenameJsEvents.aspx
Version8.0
Uses DatabaseNo

JS Charting

Gallery

JS Events