Column Chart

The Blazor Column chart displays data as vertical bars whose heights vary according to their value. You can use a Column chart to show a comparison between several sets of data (for example, summaries of sales data for different time periods). Each series is automatically colored differently for easier reading.

The Column Chart is similar to the Range Column Chart, which allows the column's low end to start above the horizontal axis.

This article assumes you are familiar with the chart basics and data binding.

To create a column chart:

1. add a ChartSeries to the ChartSeriesItems collection
2. set its Type property to ChartSeriesType.Column
3. provide a data collection to its Data property
4. optionally, provide data for the x-axis Categories

A column chart that shows product revenues

Column series

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

    <ChartCategoryAxes>
        <ChartCategoryAxis Categories="@xAxisItems"></ChartCategoryAxis>
    </ChartCategoryAxes>

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

    <ChartLegend Position="ChartLegendPosition.Right">
    </ChartLegend>
</TelerikChart>

@code {
    public List<object> series1Data = new List<object>() { 10, 2, 5, 6 };
    public List<object> series2Data = new List<object>() { 5, 8, 2, 7 };
    public string[] xAxisItems = new string[] { "Q1", "Q2", "Q3", "Q4" };
}

Column Chart Specific Appearance Settings

Labels

Each data item is decorated with a text label. You can control and customize them through the <ChartCategoryAxisLabels /> and its children tags.

• Visible - hide all labels by setting this parameter to false.
• Step - renders every n-th labels, where n is the value(double number) passed to the parameter.
• Skip - skips the first n labels, where n is the value (double number) passed to the parameter.
• Angle - rotates the labels with the desired angle by n degrees, where n is the value passed to the parameter. It can take positive and negative numbers. To set this parameter use the < ChartCategoryAxisLabelsRotation /> child tag.

To rotate the markers use the ChartCategoryAxisLabelsRotation child tag and set its Angle parameter. It can take positive and negative numbers as value.

Color

The color of a series is controlled through the Color property that can take any valid CSS color (for example, #abcdef, #f00, or blue).

Color Field

Bar and Column charts can take the color of the series item from the ColorField of the data source. You can pass a valid CSS color (for example, #abcdef, #f00, or blue).

Colors per series item

<TelerikChart>
    <ChartSeriesItems>
        <ChartSeries Type="ChartSeriesType.Bar" Data="@theData" ColorField="@nameof(MyChartDataModel.Color)"
                            Field="@nameof(MyChartDataModel.ItemValue)" CategoryField="@nameof(MyChartDataModel.Category)" />
    </ChartSeriesItems>

    <ChartTitle Text="Revenue per product" />

    <ChartLegend Position="ChartLegendPosition.Right" />
</TelerikChart>

@code {
    public class MyChartDataModel
    {
        public string Category { get; set; }
        public double ItemValue { get; set; }
        public string Color { get; set; }
    }

    public List<MyChartDataModel> theData = new List<MyChartDataModel>
    {
        new MyChartDataModel
        {
            Category = "Product 1",
            ItemValue = 2,
            Color = "red"
        },
        new MyChartDataModel
        {
            Category = "Product 2",
            ItemValue = 3,
            Color = "#00ff00"
        },
        new MyChartDataModel
        {
            Category = "Product 3",
            ItemValue = 4,
            Color = "#00f"
        }
    };
}

Gap and Spacing

You can control the distance between the categories that cluster a data point from each series. To do this, use the Gap property of the series. It is the distance between categories expressed as a percentage of the bar width.

To set the distance between the bars of different series in the same category, use the Spacing property. It is the space between the series items in one series category as a proportion of the width of a single series item.

To create overlap, set negative values.

You can configure the values of Gap and Spacing for the whole chart in the first series and they are applied for all categories and series items.

Customize Chart Elements - Nested Tags Settings

When configuring nested properties and child elements in your chart, the inner tags will contain their parent tag name and add specifics to its end. In general the structure of such nested tags will be <Chart*Category**Specifics*> where the Category can be one of the following:

• CategoryAxis
• ChartArea
• Legend
• PlotArea
• SeriesItems
• Title
• Tooltip
• ValueAxis
• XAxes
• YAxes
• and others

To customize the chart, look for nested tags and their properties - the inner tags will contain their parent tag name and add specifics to its end. For example, the ChartSeries tag has a ChartSeriesLabels tag that exposes configuration options and more child tags.

An example of this is the rotation the Labels of a categorical chart. You can use the

ChartCategoryAxes > ChartCategoryAxis > ChartCategoryAxisLabels > ChartCategoryAxisLabelsRotation tag

and set the Angle property to the desired value in degrees (they might be negative or positive numbers). By using similar approach you can take control over ChartCategoryAxisLabelsMargin (add margin for top, bottom, left and right), ChartCategoryAxisLabelsPadding (add padding for top, bottom, left and right) and others.

This approach is not limited only to the Labels - it can be used with all tags that are applicable for the chart type, for example the Chart Title ChartTitle > ChartTitleMargin.

Configuring Label Rotation, Skipping the rendering of every second label and adding borders and padding to the Labels.

@* Skip rendering every second label and customize them to have borders, padding and rotation. *@

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

    <ChartCategoryAxes>
        <ChartCategoryAxis Categories="@xAxisItems">
            <ChartCategoryAxisLabels Step="2"> @* With this you set the rendering step, in this case it will skip the rendering of every second label *@
                <ChartCategoryAxisLabelsRotation Angle="-45"></ChartCategoryAxisLabelsRotation>
                <ChartCategoryAxisLabelsPadding Top="10" Left="10" Right="10" Bottom="10"></ChartCategoryAxisLabelsPadding>
                <ChartCategoryAxisLabelsBorder Width="1" Color="#FF0000" DashType="DashType.DashDot"></ChartCategoryAxisLabelsBorder>
            </ChartCategoryAxisLabels>
        </ChartCategoryAxis>
    </ChartCategoryAxes>

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

    <ChartLegend Position="ChartLegendPosition.Right">
    </ChartLegend>
</TelerikChart>

@code {
    public List<object> series1Data = new List<object>() { 10, 2, 5, 6, 8, 8, 13, 11, 4, 9, 10, 15, 14, 3, 2 };
    public List<object> series2Data = new List<object>() { 5, 8, 2, 7, 6, 11, 14, 13, 8, 7, 2, 7, 5, 9, 11 };
    public string[] xAxisItems = new string[15];

    protected override void OnInitialized()
    {
        for (int i = 0; i < 15; i++)
        {
            xAxisItems[i] = $"looooong label {i + 1}";
        }
        base.OnInitialized();
    }
}

See Also

• Live Demo: Column Chart