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Prevent crowded grid lines in the Chart


Product Chart for Blazor


I have a Chart that has to visualize a big volume of data. This makes the grid lines clustered and the Chart hard to read and follow.


You can choose which grid lines to show (every n-th Step) and to Skip the first m through parameters on the respective grid line tag. Read more to see how to get to those tags and use the parameters.

The general approach to customize a Chart is to apply settings using nested tags. In the case of the grid lines the parent tag is

You can control the MajorGridLines for both axes from their respective nested tags - <ChartCategoryAxisMajorGridLines /> (the vertical grid lines) and <ChartValueAxisMajorGridLines /> (the horizontal grid lines).

You can apply the following settings:

  • Step - skip the rendering of every n-th line.
  • Visible - toggle whether the grid lines are visible.
  • Skip - skip the rendering of the first n lines, where n is the double number passed to the parameter.
  • You can also control other visual settings of the lines like their Color, Width and DashType.

You can do the same for the MinorGridLines too.

For a Date Axis Chart, you can set the BaseUnit parameter of the <ChartCategoryAxis> tag according to the data of your application to further control the granularity of the grid lines - this is what the number of categories and, thus, grid lines, depends on.

Declutter the grid lines of a Categorical Chart

@* This example shows how to render every second grid line for the category axis and disable the lines for the value axis *@

        <ChartSeries Type="ChartSeriesType.Column" Name="Product 1" Data="@series1Data">
        <ChartSeries Type="ChartSeriesType.Column" Name="Product 2" Data="@series2Data">

        <ChartCategoryAxis Categories="@xAxisItems">
            <ChartCategoryAxisMajorGridLines Step="2" />

            <ChartValueAxisMajorGridLines Visible="false" />

    <ChartTitle Text="Quarterly revenue per product"></ChartTitle>

    <ChartLegend Position="ChartLegendPosition.Right">

@code {
    public List<object> series1Data = new List<object>() { 10, 2, 5, 6, 8 };
    public List<object> series2Data = new List<object>() { 5, 8, 2, 7, 6 };
    public string[] xAxisItems = new string[5];

    protected override void OnInitialized()
        for (int i = 0; i < 5; i++)
            xAxisItems[i] = $"label {i + 1}";

The result from the code snippet above

customize chart grid lines


You can also see the Knowledge base article regarding overlapping labels to further improve the layout of the Chart.

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