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kb(Chart): Add KB for sorting Chart categories #2743

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112 changes: 112 additions & 0 deletions knowledge-base/chart-sort-categories.md
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---
title: Sort Chart Categories
description: How to sort horizontal axis categories in the Telerik Chart for Blazor, depending on data point values?
type: how-to
page_title: How to Sort Blazor Chart Categories
slug: chart-kb-sort-categories
tags: blazor, chart
ticketid: 1677715
res_type: kb
---

## Environment

<table>
<tbody>
<tr>
<td>Product</td>
<td>Chart for Blazor</td>
</tr>
</tbody>
</table>

## Description

This KB answers the following questions:

* How to sort a stacked Chart by category total values?
* How to order the Telerik Blazor Chart categories by the aggregated sum values of the data items?
* How do you sort a stacked column Chart by category totals?

## Solution

The Chart sorts its categories by their order of appearance in the data. To reorder the categories, you need to reorder the Chart data items, so that the `CategoryField` values occur in the same order as the desired category order.

The example below sorts the categories (`Company`) by the stacked value (sum) of each company's `Revenue` for all its `Product`s.

>caption Sort Chart categories by sorting Chart data items

````RAZOR
<TelerikChart>
<ChartSeriesItems>
@for (int s = 1; s <= ProductCount; s++)
{
<ChartSeries @key="@s"
Type="ChartSeriesType.Column"
Data="@ChartData.Where( x => x.Product == $"Product {s}" ).ToList()"
CategoryField="@nameof(SalesData.Company)"
Field="@nameof(SalesData.Revenue)"
Name="@( $"Product {s}" )">
<ChartSeriesStack Enabled="true" Group="default" />
<ChartSeriesTooltip Visible="true" />
</ChartSeries>
}
</ChartSeriesItems>

<ChartValueAxes>
<ChartValueAxis>
<ChartValueAxisLabels Format="c2" />
</ChartValueAxis>
</ChartValueAxes>

<ChartTitle Text="Revenue per Company and Product"></ChartTitle>

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

@code {
private List<SalesData> ChartData { get; set; } = new();

private Dictionary<string, decimal> SortedTotalRevenues { get; set; } = new();

private const int CompanyCount = 5;
private const int ProductCount = 3;

protected override void OnInitialized()
{
for (int i = 1; i <= CompanyCount; i++)
{
for (int j = 1; j <= ProductCount; j++)
{
ChartData.Add(new SalesData()
{
Product = $"Product {j}",
Revenue = Random.Shared.Next(1, 1000),
Company = $"Company {i}"
});
}
}

ChartData = ChartData
.GroupBy(dataItem => dataItem.Company)
.Select(group => new { Company = group.Key, TotalRevenue = group.Sum(groupItem => groupItem.Revenue), Data = group.ToList() })
.OrderBy(anonymousObject => anonymousObject.TotalRevenue)
.SelectMany(anonymousObject => anonymousObject.Data)
.ToList();
}

public class SalesData
{
public int Id { get; set; }
public string Product { get; set; } = string.Empty;
public string Company { get; set; } = string.Empty;
public decimal Revenue { get; set; }
}
}
````

## See Also

* [How to display a stacked series sum label in the Telerik Blazor Chart](slug:chart-kb-stacked-series-sum-label)
* [Chart Series Stacking](slug://components/chart/stack)
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