Added new kb article chart-legend-colors-not-matching-stacked-bar-chart

Author: KB Bot

knowledge-base/chart-legend-colors-not-matching-stacked-bar-chart.md

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+---
+title: Legend Colors Do Not Match Data Points in Stacked Bar Chart
+description: Explains why the legend colors might not match the data points in a stacked bar chart and provides a solution.
+type: troubleshooting
+page_title: Ensure Legend Colors Match Data Points in Stacked Bar Charts
+slug: chart-kb-legend-colors-not-matching-stacked-bar-chart
+tags: charts, bar chart, stacked series, legend, color
+res_type: kb
+ticketid: 1684367
+---
+
+## Environment
+
+<table>
+    <tbody>
+        <tr>
+            <td>Product</td>
+            <td>Charts for Blazor</td>
+        </tr>
+    </tbody>
+</table>
+
+## Description
+
+When creating a Chart with Stacked Series, the colors of the data points render correctly on the Chart itself, but the legend colors do not match the colors of the data points. This discrepancy occurs when using the `ColorField` parameter.
+
+## Cause
+
+This behavior is by design. Using the `ColorField` parameter to assign a unique color to each data point within a single series is supported in **non-stacked** Charts, but not in stacked Charts.
+
+Stacked Charts are designed to visualize the cumulative value of multiple series stacked atop one another. Applying individual colors to each data point in this context would compromise the visual clarity of the stack relationships and make it difficult for the legend to accurately reflect the data.
+
+## Solution
+
+To ensure that the legend colors match the data points in a stacked Chart, use the `Color` parameter of the `ChartSeries`. This parameter sets a uniform color for all data points (bars) within a single series and determines the color shown in the legend for that series.
+
+Here is an example configuration that applies a specific color to each series in a stacked bar chart:
+
+`````Razor
+<TelerikChart Width="100%" Height="100%">
+    <ChartSeriesItems>
+        @foreach (var series in _graphDataPoints)
+        {
+            <ChartSeries Field="@nameof(GraphDataPoint.Value)"
+                         Type="ChartSeriesType.Bar"
+                         Name="@series.Label"
+                         Color="@series.Color"
+                         Data="@([series])">
+                <ChartSeriesStack Enabled="true" />
+            </ChartSeries>
+        }
+    </ChartSeriesItems>
+    <ChartLegend Position="ChartLegendPosition.Right" />
+</TelerikChart>
+
+@code {
+    public class GraphDataPoint
+    {
+        public required string Color { get; set; }
+        public required int Value { get; set; }
+        public required string Label { get; set; }
+    }
+
+    private List<GraphDataPoint> _graphDataPoints { get; set; } = [
+        new GraphDataPoint
+        {
+            Label = "Early Settlement Candidate",
+            Value = 1024,
+            Color = "#D46663"
+        },
+    new GraphDataPoint
+         {
+            Label = "Needs Discovery to Strategize",
+            Value = 980,
+            Color = "#F89995"
+        },
+    new GraphDataPoint
+        {
+            Label = "Potential Dispositive Candidate",
+            Value = 1006,
+            Color = "#FFC7C7"
+        },
+    new GraphDataPoint
+         {
+            Label = "Potential Trial Candidate",
+            Value = 1003,
+            Color =  "#BCDCCF",
+        },
+    new GraphDataPoint
+        {
+            Label = "Settlement Candidate",
+            Value = 987,
+            Color = "#79C8AB"
+        }
+    ];
+}
+`````