RadHtmlChart should allow the usage of indices in the DataFormatString when DateTime values are used:
                <XAxis Type="Date">
                    <LabelsAppearance DataFormatString="{0:d}" />
                </XAxis>

Currently, the HighlightAppearance of the Series does not have a property that controls the InactiveOpacity:

• https://docs.telerik.com/kendo-ui/api/javascript/dataviz/ui/chart/configuration/series.highlight#serieshighlightinactiveopacity 

As a temporary workaround, this can be set through the options in the OnKendoWidgetInitializing event:

<script>
    function OnKendoWidgetInitializing(sender, args) {
        var series = args.series[0]
        series.highlight = series.highlight || {};
        series.highlight.inactiveOpacity = 0.2
    }
</script>
<telerik:RadHtmlChart ID="RadHtmlChart5" runat="server" BorderColor="Fuchsia" BorderStyle="Solid" BorderWidth="1px">
    <ClientEvents OnKendoWidgetInitializing="OnKendoWidgetInitializing" />
    <PlotArea>

        <Series>
            <telerik:PieSeries StartAngle="90">
                <%-- This is how it should be configured after the feature request --%>
                <%--<HighlightAppearance InactiveOpacity="0.2" />--%>

                <SeriesItems>
                    <telerik:PieSeriesItem Name="Slice1" Y="60"></telerik:PieSeriesItem>
                    <telerik:PieSeriesItem Name="Slice2" Y="40"></telerik:PieSeriesItem>
                </SeriesItems>
            </telerik:PieSeries>
        </Series>
    </PlotArea>
</telerik:RadHtmlChart>

Test Environment:

When migrating from a GeckoBoard.com dashboard, I have a Area Chart where the values over the target are one colour and those below another colour, this is true of Area and Bar charts. At the moment  I can use the "'ColorField="ErrorsColor"> " to colour the whole column to a given colour, but not that part above its Target.
One approach could be is to have 2 plots one below the target and one above the target, I would prefer to be this in control of the HtmlChart and for me not to frig it.
Thanks

The workaround is to set <MarkersAppearance Visible="false"  />.

For the time being the following events can be handled through the chartObject.

Select event is fired when the range of the selector from the navigator pane is changed.

JavaScript:

    <telerik:RadCodeBlock ID="RadCodeBlock1" runat="server">
        <script>
            function pageLoad() {
                var chart = $find('<%=RadHtmlChart1.ClientID%>');
                chart._chartObject.bind("selectEnd", OnSelectEnd);
            }

            function OnSelectEnd(e) {
                alert("OnSelectEnd triggered: \nFrom: " + e.from + "\n To: " + e.to);
            }

        </script>
    </telerik:RadCodeBlock>
ASPX:

        <telerik:RadHtmlChart runat="server" ID="RadHtmlChart1" Layout="Stock" Width="800" Height="400"
            Transitions="true">
            <PlotArea>
                <XAxis Name="mainAxis" DataLabelsField="SellDate" Type="Date">
                </XAxis>
                <Series>
                    <telerik:ColumnSeries DataFieldY="SellQuantity">
                    </telerik:ColumnSeries>
                </Series>
            </PlotArea>
            <Navigator Visible="true">
                <XAxis Name="navAxis"></XAxis>
                <SelectionHint Visible="true" />
                <Series>
                    <telerik:AreaSeries DataFieldY="SellQuantity">
                    </telerik:AreaSeries>
                </Series>
            </Navigator>
        </telerik:RadHtmlChart>

C#:

    protected void Page_Load(object sender, EventArgs e)
    {
        RadHtmlChart1.DataSource = GetData();
        RadHtmlChart1.DataBind();
    }

    protected DataTable GetData()
    {
        DataTable dt = new DataTable();

        dt.Columns.Add("ID", typeof(int));
        dt.Columns.Add("SellQuantity", typeof(int));
        dt.Columns.Add("SellDate", typeof(DateTime));

        dt.Rows.Add(1, 2, new DateTime(2011, 06, 12));
        dt.Rows.Add(1, 5, new DateTime(2011, 12, 12));
        dt.Rows.Add(2, 6, new DateTime(2012, 06, 17));
        dt.Rows.Add(3, 4, new DateTime(2012, 09, 18));
        dt.Rows.Add(4, 7, new DateTime(2013, 03, 18));

        return dt;
    }

Hi , help to change the RadChart To RadHtmlChart for line chart series , below is the existing code used RadChart . i need to update to RadHtmlChart

hartAnalysis_BLL objBLL = new ChartAnalysis_BLL();
DataTable dt = objBLL.GetMonthlySSMTotalQuantityImported(arrParameters);

// Create new chart
RadChart2.ChartTitle.TextBlock.Appearance.TextProperties.Font = new System.Drawing.Font(RadChart2.ChartTitle.TextBlock.Appearance.TextProperties.Font.FontFamily, 11, System.Drawing.FontStyle.Bold);
RadChart2.ChartTitle.TextBlock.Text = "Extended Monthly SSM Total Quantity Imported \n(" + ssm[0] + ")";
RadChart2.Width = AppConstants.CONST_CHART_WIDTH;
RadChart2.ChartTitle.Visible = true;
RadChart2.Chart.DefaultType = ChartSeriesType.Line;
RadChart2.PlotArea.Appearance.Dimensions.Margins.Left = Telerik.Charting.Styles.Unit.Percentage(10);
RadChart2.PlotArea.Appearance.Dimensions.Margins.Right = Telerik.Charting.Styles.Unit.Percentage(15);
RadChart2.PlotArea.Appearance.Dimensions.Margins.Bottom = Telerik.Charting.Styles.Unit.Percentage(30);

RadChart2.DataManager.ValuesXColumn = "Date";
RadChart2.DataManager.ValuesYColumns = new string[1] { "SSM Quantity" };
RadChart2.IntelligentLabelsEnabled = true;
RadChart2.DataSource = dt;
RadChart2.DataBind();
RadChart2.Skin = AppConstants.CONST_TELERIK_CHARTSKIN;

RadChart2.PlotArea.XAxis.Clear();
RadChart2.PlotArea.XAxis.IsZeroBased = false;
RadChart2.PlotArea.XAxis.AutoScale = false;
RadChart2.PlotArea.XAxis.Appearance.ValueFormat = ChartValueFormat.ShortDate;
RadChart2.PlotArea.XAxis.Appearance.CustomFormat = "MMM yy";
RadChart2.PlotArea.XAxis.AxisLabel.Visible = true;
RadChart2.PlotArea.XAxis.AxisLabel.TextBlock.Text = "Month \n(" + AppFunctions.GetDisclaimer() + ")";
RadChart2.PlotArea.XAxis.AxisLabel.TextBlock.Appearance.TextProperties.Color = System.Drawing.Color.Black;
RadChart2.PlotArea.XAxis.Appearance.LabelAppearance.RotationAngle = -45;

RadChart2.PlotArea.YAxis.AxisLabel.Visible = true;
RadChart2.PlotArea.YAxis.AxisLabel.TextBlock.Text = "Total Quantity of SSM Imported (" + dt.Rows[0]["UOM"] + ")";
RadChart2.PlotArea.YAxis.AxisLabel.TextBlock.Appearance.TextProperties.Color = System.Drawing.Color.Black;

RadChart2.Series.GetSeries(0).Appearance.PointMark.Dimensions.Width = 1;
RadChart2.Series.GetSeries(0).Appearance.PointMark.Dimensions.Height = 1;
RadChart2.Series.GetSeries(0).Appearance.PointMark.FillStyle.MainColor = System.Drawing.Color.Black;
RadChart2.Series.GetSeries(0).Appearance.PointMark.FillStyle.FillType = FillType.Solid;
RadChart2.Series.GetSeries(0).Appearance.PointMark.Visible = true;
RadChart2.Series.GetSeries(0).Appearance.LineSeriesAppearance.Color = System.Drawing.Color.Orange;
RadChart2.Series.GetSeries(0).Appearance.LineSeriesAppearance.Width = 3;

int intYear = dt_SelDateFrom.Year;
int intMonth = dt_SelDateFrom.Month;
DateTime start = new DateTime(intYear, intMonth, 1);
TimeSpan ts = dt_SelDateTo - dt_SelDateFrom;
int intMthDiff = Convert.ToInt32(Math.Ceiling((ts.TotalDays / 30)));

for (int i = 0; i < intMthDiff; i++)
{
    ChartAxisItem item = new ChartAxisItem();
    item.Value = (decimal)start.AddMonths(i).ToOADate();
    RadChart2.PlotArea.XAxis.AddItem(item);
}

DataTable dt_avg = objBLL.GetSSMTotalImportedLastYearAverage(arrParameters);

// Define chart series
ChartSeries avg_series = new ChartSeries();
avg_series.Appearance.LabelAppearance.Visible = false;
avg_series.Name = "Last Year Average";
avg_series.Type = ChartSeriesType.Line;
avg_series.Appearance.PointMark.Dimensions.Width = 1;
avg_series.Appearance.PointMark.Dimensions.Height = 1;
avg_series.Appearance.PointMark.FillStyle.MainColor = System.Drawing.Color.Black;
avg_series.Appearance.PointMark.FillStyle.FillType = FillType.Solid;
avg_series.Appearance.PointMark.Visible = true;
avg_series.Appearance.LineSeriesAppearance.Color = System.Drawing.Color.Red;

foreach (DataRow row in dt_avg.Rows)
{
    foreach (DataColumn col in dt_avg.Columns)
    {
        Decimal dec_data = Convert.ToDecimal(row[col]);
        Double dbl_data = Convert.ToInt32(dec_data);
        avg_series.AddItem(dbl_data);
    }
}

RadChart2.AddChartSeries(avg_series);

ArrayList arrParameterBaseline = new ArrayList();
arrParameterBaseline.Add(dt_SelBaselineFrom);
arrParameterBaseline.Add(dt_SelBaselineTo);
arrParameterBaseline.Add(dt_SelSSMSeqID);
SqlDataReader dr_baseline = objBLL.GetSSMTotalImportedBaseline(arrParameterBaseline);

ChartSeries baseline_series = new ChartSeries();
baseline_series.Appearance.LabelAppearance.Visible = false;
baseline_series.Name = "Baseline Average";
baseline_series.Type = ChartSeriesType.Line;
baseline_series.Appearance.PointMark.Dimensions.Width = 1;
baseline_series.Appearance.PointMark.Dimensions.Height = 1;
baseline_series.Appearance.PointMark.FillStyle.MainColor = System.Drawing.Color.Black;
baseline_series.Appearance.PointMark.FillStyle.FillType = FillType.Solid;
baseline_series.Appearance.PointMark.Visible = true;
baseline_series.Appearance.LineSeriesAppearance.Color = System.Drawing.Color.Chartreuse;

Double dbl_baseline = 0;

if (dr_baseline == null)
{
    dbl_baseline = 0;
}
else
{
    try
    {
        while (dr_baseline.Read())
        {
            if (dr_baseline["TotalImportedBaseline"] == DBNull.Value)
                dbl_baseline = 0;
            else
            {
                Decimal dec_baseline = dr_baseline.GetDecimal(dr_baseline.GetOrdinal("TotalImportedBaseline"));
                dbl_baseline = Convert.ToDouble(dec_baseline);
            }
        }
    }
    catch (Exception ex)
    {
        AppFunctions.SetMessageError(this.Page, AppConstants.CONST_ERROR_LOAD_CHART);
        AppFunctions.ErrorLog(ex);
    }
    finally
    {
        if (dr_baseline != null)
        {
            dr_baseline.Close();
            dr_baseline.Dispose();
        }
    }
}

for (int i = 0; i < intMthDiff; i++)
{
    baseline_series.AddItem(dbl_baseline);
}

RadChart2.AddChartSeries(baseline_series);

Panel1.Controls.Add(RadChart2);

}
catch (Exception ex)
{
    AppFunctions.SetMessageError(this.Page, AppConstants.CONST_ERROR_LOAD_CHART);
    AppFunctions.ErrorLog(ex);
}

A workaround is to use the ClientTemplate and change the strings manually with some JavaScript (http://www.telerik.com/help/aspnet-ajax/htmlchart-client-templates-for-tooltips-and-labels-execute-javascript-and-display-html.html), e.g.:
<telerik:RadHtmlChart runat="server" ID="RadHtmlChart1" Width="400px" Height="400px">
	<PlotArea>
		<Series>
			<telerik:BarSeries>
			<LabelsAppearance>
			<ClientTemplate>
				#if (value > 0) {# $#=value# #} else {# -$#=value * -1# #} #
			</ClientTemplate>
			</LabelsAppearance>
				<SeriesItems>
					<telerik:CategorySeriesItem Y="20" />
					<telerik:CategorySeriesItem Y="10" />
					<telerik:CategorySeriesItem Y="-30" />
				</SeriesItems>
			</telerik:BarSeries>
		</Series>
	</PlotArea>
</telerik:RadHtmlChart>

When user moved/resized RangeSelector it could be OnClientNavigationRangeChangedEvent fired, with new RangeSelector.From and RangeSelector.To values.

For the time being the property can be set through the kendoWidget:
Available options can be found here - http://docs.telerik.com/kendo-ui/api/dataviz/chart#configuration-categoryAxis.weekStartDay
		<script>
			function pageLoad() {
				var kendoWidget = $find("<%=RadHtmlChart1.ClientID%>")._chartObject;
				kendoWidget.options.categoryAxis.weekStartDay = 1;
				kendoWidget.redraw();
			}
		</script>
		<telerik:RadHtmlChart runat="server" ID="RadHtmlChart1" Width="600px" Height="400px">
			<PlotArea>
				<Series>
					<telerik:ColumnSeries Name="Product 1" DataFieldY="SellQuantity">
					</telerik:ColumnSeries>
				</Series>
				<XAxis DataLabelsField="SellDate">
					<LabelsAppearance DataFormatString="yyyy/MM/dd"></LabelsAppearance>
				</XAxis>
			</PlotArea>
		</telerik:RadHtmlChart>

For the time being the property can be set through the kendoWdiget:

        <script>
            function pageLoad() {
                var kendoWidget = $find("<%=RadHtmlChart1.ClientID%>")._chartObject;
                kendoWidget.options.series[0].labels.distance = 20;
                kendoWidget.redraw();
            }
        </script>
        <telerik:RadHtmlChart ID="RadHtmlChart1" runat="server" Width="400px" Height="400px">
            <PlotArea>
                <Series>
                    <telerik:PieSeries>
                        <SeriesItems>
                            <telerik:PieSeriesItem Y="30" />
                            <telerik:PieSeriesItem Y="10" />
                            <telerik:PieSeriesItem Y="20" />
                        </SeriesItems>
                    </telerik:PieSeries>
                </Series>
            </PlotArea>
        </telerik:RadHtmlChart>

For the time being you can set the property through the kendoWidget. All available options are available at http://docs.telerik.com/kendo-ui/api/javascript/dataviz/ui/chart#configuration-series.connectors
        <script>
            function pageLoad() {
                var kendoWidget = $find("<%=RadHtmlChart1.ClientID%>")._chartObject;
                kendoWidget.options.series[0].connectors = {width: "3", color: "#ff0000"};
                kendoWidget.redraw();
            }
        </script>
        <telerik:RadHtmlChart ID="RadHtmlChart1" runat="server" Width="400px" Height="400px">
            <PlotArea>
                <Series>
                    <telerik:PieSeries>
                        <SeriesItems>
                            <telerik:PieSeriesItem Y="30" />
                            <telerik:PieSeriesItem Y="10" />
                            <telerik:PieSeriesItem Y="20" />
                        </SeriesItems>
                    </telerik:PieSeries>
                </Series>
            </PlotArea>
        </telerik:RadHtmlChart>

Series tooltips are not visible in a Stock chart when the same series is added programmatically in the plotarea and the navigator simultaneously.

The workaround is to:
1) Create different series for the plot area and the navigator.
2) Explicitly set the tooltips' visibility with JS like this:
        <script type="text/javascript">
            function pageLoad() {
                var chart = $find("Chart");
                var series = chart._chartObject.options.series[0];
                series.tooltip.visible = true;
                //repaint the chart to apply the changes
                chart.repaint();
            }
        </script>

The CSS styles of the selection hint of the navigator in HtmlChart are not applied correctly in a data navigation scenario.

The workaround is to override the styles that you need like this:
        .k-navigator-hint .k-tooltip {
            border: 2px solid red !important;
            color: #000 !important;
        }

For the time being properties can be set to the kendoWidget on the client:
ASPX:
		<script>
			function pageLoad() {
				var chart = $find("<%=RadHtmlChart1.ClientID%>");
				chart._chartObject.options.xAxis.min = new Date(2013, 04, 01);
				chart._chartObject.options.xAxis.max = new Date(2013, 05, 01);
				chart.repaint();
			}
		</script>
		<telerik:RadHtmlChart runat="server" ID="RadHtmlChart1" Width="640px" Height="480px">
			<PlotArea>
				<Series>
					<telerik:ScatterLineSeries DataFieldY="SellQuantity" DataFieldX="SellDate">
						<LabelsAppearance DataFormatString="{1} cars sold on {0:m}">
						</LabelsAppearance>
						<TooltipsAppearance Color="White" DataFormatString="{1} cars sold on<br/>{0:D}" />
					</telerik:ScatterLineSeries>
				</Series>
				<XAxis BaseUnit="Days">
					<TitleAppearance Text="Sell Date">
					</TitleAppearance>
					<LabelsAppearance DataFormatString="d" RotationAngle="45">
					</LabelsAppearance>
					<MajorGridLines Color="#EFEFEF" Width="1"></MajorGridLines>
					<MinorGridLines Color="#F7F7F7" Width="1"></MinorGridLines>
				</XAxis>
				<YAxis>
					<TitleAppearance Text="Quantity">
					</TitleAppearance>
					<MajorGridLines Color="#EFEFEF" Width="1"></MajorGridLines>
					<MinorGridLines Color="#F7F7F7" Width="1"></MinorGridLines>
				</YAxis>
			</PlotArea>
			<ChartTitle Text="Sold Cars per Date">
			</ChartTitle>
		</telerik:RadHtmlChart>
C#:
	protected void Page_Load(object sender, EventArgs e)
	{
		RadHtmlChart1.DataSource = GetData();
		RadHtmlChart1.DataBind();
	}

	protected DataTable GetData()
	{
		DataTable dt = new DataTable();

		dt.Columns.Add("ID", typeof(int));
		dt.Columns.Add("SellQuantity", typeof(int));
		dt.Columns.Add("SellDate", typeof(DateTime));

		dt.Rows.Add(1, 2, new DateTime(2013, 05, 12));
		dt.Rows.Add(2, 5, new DateTime(2013, 05, 13));
		dt.Rows.Add(3, 6, new DateTime(2013, 05, 17));
		dt.Rows.Add(4, 4, new DateTime(2013, 05, 18));
		dt.Rows.Add(5, 7, new DateTime(2013, 05, 22));

		return dt;
	}

For the time being the function can be set through the kendoWidget:
ASPX:
		<telerik:RadScriptManager ID="RadScriptManager1" runat="server"></telerik:RadScriptManager>
		<script>
			function pageLoad() {
				var chart = $find("<%=RadHtmlChart1.ClientID%>");
				chart._chartObject.options.series[0].markers.type = function (point) {
					if (point.value > 2) {
						return "triangle";
					}
					else {
						return "circle";
					}
				};
				chart.repaint();
			}
		</script>
		<telerik:RadHtmlChart runat="server" ID="RadHtmlChart1" Width="600px" Height="400px">
			<PlotArea>
				<Series>
					<telerik:LineSeries Name="Product 1">
						<SeriesItems>
							<telerik:CategorySeriesItem Y="1" />
							<telerik:CategorySeriesItem Y="2" />
							<telerik:CategorySeriesItem Y="3" />
						</SeriesItems>
					</telerik:LineSeries>
				</Series>
				<XAxis>
					<Items>
						<telerik:AxisItem LabelText="1" />
						<telerik:AxisItem LabelText="2" />
						<telerik:AxisItem LabelText="3" />
					</Items>
				</XAxis>
			</PlotArea>
			<ChartTitle Text="Product sales for 2011">
			</ChartTitle>
			<Legend>
				<Appearance Position="Bottom" />
			</Legend>
		</telerik:RadHtmlChart>

I have a stacked bar RadHtmlChart that is created programmatically in the code behind.
When I create the chart, and set the width to Unit.Pixel(1500), it works fine, as shown in Working.png. However, when I change the value to Unit.Percentage(90), the chart is not rendered properly at all.

Any fixes/workarounds for this?

Seán


For the time being you must set percentage to the chart's wrapper. For example:
CSS:
	<style type="text/css">
		html, body, form {
			padding: 0;
			margin: 0;
			height: 100%;
			overflow: hidden;
		}

		.myChart {
			width: 100% !important;
			height: 100% !important;
		}
	</style>
ASPX:
		<div style="width: 30%; height: 40%; border: 1px solid green;">
			<telerik:RadHtmlChart runat="server" ID="RadHtmlChart1" CssClass="myChart" Width="600px" Height="400px">
				<PlotArea>
					<Series>
						<telerik:ColumnSeries Name="Product 1">
							<SeriesItems>
								<telerik:CategorySeriesItem Y="15000" />
								<telerik:CategorySeriesItem Y="23000" />
								<telerik:CategorySeriesItem Y="10000" />
							</SeriesItems>
						</telerik:ColumnSeries>
					</Series>
					<XAxis>
						<Items>
							<telerik:AxisItem LabelText="1" />
							<telerik:AxisItem LabelText="2" />
							<telerik:AxisItem LabelText="3" />
						</Items>
					</XAxis>
				</PlotArea>
				<ChartTitle Text="Product sales for 2011">
				</ChartTitle>
				<Legend>
					<Appearance Position="Bottom" />
				</Legend>
			</telerik:RadHtmlChart>
		</div>

For the time being the property can be set through the kendoWidget:
ASPX:
		<script>
			function pageLoad() {
				$ = $telerik.$;
				var kendoWidget = $find("<%=PieChart1.ClientID%>")._chartObject;
				kendoWidget.options.series[0].labels.visible = function (point) {
					if (point.value < 5) {
						return false;
					} else {
						return true;
					};
				}
				kendoWidget.redraw();
			}
		</script>

		<telerik:RadHtmlChart runat="server" ID="PieChart1" Transitions="true" Width="450px" Height="450px">
			<PlotArea>
				<Series>
					<telerik:DonutSeries StartAngle="90">
						<LabelsAppearance Position="OutsideEnd" DataFormatString="{0} %" />
						<TooltipsAppearance DataFormatString="{0} %" />
						<SeriesItems>
							<telerik:PieSeriesItem BackgroundColor="Purple" Exploded="true" Name="Internet Explorer" Y="18.3" />
							<telerik:PieSeriesItem BackgroundColor="Orange" Exploded="false" Name="Firefox" Y="35.8" />
							<telerik:PieSeriesItem BackgroundColor="Green" Exploded="false" Name="Chrome" Y="38.3" />
							<telerik:PieSeriesItem BackgroundColor="Blue" Exploded="false" Name="Safari" Y="4.5" />
							<telerik:PieSeriesItem BackgroundColor="Red" Exploded="false" Name="Opera" Y="2.3" />
						</SeriesItems>
					</telerik:DonutSeries>
				</Series>
			</PlotArea>
			<ChartTitle Text="Browser Usage for April 2012">
			</ChartTitle>
		</telerik:RadHtmlChart>

Under the standard definition of data format strings, range scaling can be applied (i.e. divide by 1000) using , prefixing the implied or explicit decimal place.
e.g. DataFormatString="{0:#,#,}" will display 3000000 as 3,000

This works on RadPivotGrid correctly, but RadHTMLChart does not work either on data labels, axis labels, or pretty much anywhere else. Apparently a problem with kendo.format(), which does not do this as per documentation for DataFormatString

N.B. This is commonly used in finance presentations to globally present in $thousands.