Aggregation in Blazor Pivot Table Component

8 Aug 202416 minutes to read

NOTE

This feature is applicable only for relational data source.

End user can perform calculations over a group of values (exclusively for value fields bound in value axis) using the aggregation option. By default, values are added (summed) together. The other aggregation types are explained below.

NOTE

The fields with data type such as number supports all aggregation types mentioned below except for “CalculatedField”. The fields with data type such as string, date, datetime, boolean, etc., supports “Count” and “DistinctCount” aggregation types alone.

Operator	Description
Sum	Displays the pivot table values with sum.
Product	Displays the pivot table values with product.
Count	Displays the pivot table values with count.
DistinctCount	Displays the pivot table values with distinct count.
Min	Displays the pivot table with minimum value.
Max	Displays the pivot table with maximum value.
Avg	Displays the pivot table values with average.
Index	Displays the pivot table values with index.
PopulationStDev	Displays the pivot table values with standard deviation of population.
SampleStDev	Displays the pivot table values with sample standard deviation.
PopulationVar	Displays the pivot table values with variance of population.
SampleVar	Displays the pivot table values with sample variance.
RunningTotals	Displays the pivot table values with running totals.
DifferenceFrom	Displays the pivot table values with difference from the value of the base item in the base field.
PercentageOfDifferenceFrom	Displays the pivot table values with percentage difference from the value of the base item in the base field.
PercentageOfGrandTotal	Displays the pivot table values with percentage of grand total of all values.
PercentageOfColumnTotal	Displays the pivot table values in each column with percentage of total values for the column.
PercentageOfRowTotal	Displays the pivot table values in each row with percentage of total values for the row.
PercentageOfParentTotal	Displays the pivot table values with percentage of total of all values based on selected field.
PercentageOfParentColumnTotal	Displays the pivot table values with percentage of its parent total in each column.
PercentageOfParentRowTotal	Displays the pivot table values with percentage of its parent total in each row.
CalculatedField	Displays the pivot table with calculated field values. It allows user to create a new calculated field alone.

Assigning aggregation type for value fields through API

For each value field, the aggregation type can be set using the property Type in PivotViewValue class. Meanwhile, aggregation types like SummaryTypes.DifferenceFrom and SummaryTypes.PercentageOfDifferenceFrom can check for specific field of specific item using BaseField and BaseItem properties. Likewise, SummaryTypes.PercentageOfParentTotal type can check for specific field using BaseField property. For instance, the aggregation type SummaryTypes.DifferenceFrom would intake the specified field and its corresponding member as input and its value is compared across other members in the same field and also across different fields to formulate an appropriate output value.

Type: It allows to set the aggregate type of the field.
BaseField: It allows to set the specific field to aggregate the values.
BaseItem: It allows to set the specific member to aggregate the values.

@using Syncfusion.Blazor.PivotView

<SfPivotView TValue="ProductDetails">
     <PivotViewDataSourceSettings DataSource="@data">
        <PivotViewColumns>
            <PivotViewColumn Name="Year"></PivotViewColumn>
            <PivotViewColumn Name="Quarter"></PivotViewColumn>
        </PivotViewColumns>
        <PivotViewRows>
            <PivotViewRow Name="Country"></PivotViewRow>
            <PivotViewRow Name="Products"></PivotViewRow>
        </PivotViewRows>
        <PivotViewValues>
            <PivotViewValue Name="Sold" Caption="Unit Sold" Type="SummaryTypes.DifferenceFrom" BaseField="Country" BaseItem="France"></PivotViewValue>
            <PivotViewValue Name="Amount" Caption="Sold Amount" Type=SummaryTypes.Min></PivotViewValue>
        </PivotViewValues>
        <PivotViewFormatSettings>
            <PivotViewFormatSetting Name="Amount" Format="C"></PivotViewFormatSetting>
        </PivotViewFormatSettings>
    </PivotViewDataSourceSettings>
</SfPivotView>

@code{
    public List<ProductDetails> data { get; set; }
    protected override void OnInitialized()
    {
        this.data = ProductDetails.GetProductData().ToList();
        //Bind the data source collection here. Refer "Assigning sample data to the pivot table" section in getting started for more details.
    }
}

Aggregation in Blazor PivotTable

NOTE

By default, the aggregation will be considered as SummaryTypes.Sum to the value fields which had number type and for the value fields which had non-number type such as string, date, datetime, boolean, etc., the aggregation type will be considered as SummaryTypes.Count.

By default, all the aggregation types are displayed in the dropdown menu available in buttons. However, based on the request for an application, there may be a need to show selective aggregation types on our own. This can be achieved using the AggregateTypes property.

@using Syncfusion.Blazor.PivotView

<SfPivotView TValue="ProductDetails" ShowGroupingBar="true" AggregateTypes="@aggregateType">
     <PivotViewDataSourceSettings DataSource="@dataSource">
        <PivotViewColumns>
            <PivotViewColumn Name="Year"></PivotViewColumn>
            <PivotViewColumn Name="Quarter"></PivotViewColumn>
        </PivotViewColumns>
        <PivotViewRows>
            <PivotViewRow Name="Country"></PivotViewRow>
            <PivotViewRow Name="Products"></PivotViewRow>
        </PivotViewRows>
        <PivotViewValues>
            <PivotViewValue Name="Sold" Caption="Units Sold"></PivotViewValue>
            <PivotViewValue Name="Amount" Caption="Sold Amount"></PivotViewValue>
        </PivotViewValues>
        <PivotViewFormatSettings>
            <PivotViewFormatSetting Name="Amount" Format="C"></PivotViewFormatSetting>
        </PivotViewFormatSettings>
    </PivotViewDataSourceSettings>
</SfPivotView>

@code{
    public List<AggregateTypes> aggregateType = new List<AggregateTypes> {
        AggregateTypes.DistinctCount,
        AggregateTypes.Avg,
        AggregateTypes.Product
    };
    public List<ProductDetails> dataSource { get; set; }
    protected override void OnInitialized()
    {
        this.dataSource = ProductDetails.GetProductData().ToList();
        //Bind the data source collection here. Refer "Assigning sample data to the pivot table" section in getting started for more details.
    }
}

Modifying aggregation type for value fields at runtime

Aggregation types can be changed easily through UI at runtime. The value fields bound to grouping bar and field list appears with a dropdown icon which helps to select an appropriate aggregation type for the respective value field. On selection, the values in the pivot table will be changed dynamically.

Hiding aggregation type from button text

By default, in value axis each field would be displayed by its name and aggregation type together. To hide aggregation type and display field name alone, set the property ShowAggregationOnValueField in PivotViewDataSourceSettings class to false.

@using Syncfusion.Blazor.PivotView

<SfPivotView TValue="ProductDetails">
     <PivotViewDataSourceSettings DataSource="@data" ShowAggregationOnValueField="false">
        <PivotViewColumns>
            <PivotViewColumn Name="Year"></PivotViewColumn>
            <PivotViewColumn Name="Quarter"></PivotViewColumn>
        </PivotViewColumns>
        <PivotViewRows>
            <PivotViewRow Name="Country"></PivotViewRow>
            <PivotViewRow Name="Products"></PivotViewRow>
        </PivotViewRows>
        <PivotViewValues>
            <PivotViewValue Name="Sold" Caption="Unit Sold"></PivotViewValue>
            <PivotViewValue Name="Amount" Caption="Sold Amount"></PivotViewValue>
        </PivotViewValues>
        <PivotViewFormatSettings>
            <PivotViewFormatSetting Name="Amount" Format="C"></PivotViewFormatSetting>
        </PivotViewFormatSettings>
    </PivotViewDataSourceSettings>
</SfPivotView>

@code{
    public List<ProductDetails> data { get; set; }
    protected override void OnInitialized()
    {
        this.data = ProductDetails.GetProductData().ToList();
        //Bind the data source collection here. Refer "Assigning sample data to the pivot table" section in getting started for more details.
    }
}

Hiding Aggregation Types via FieldList in Blazor PivotTable

Hiding Aggregation Types via GroupBar in Blazor PivotTable

Hiding aggregation type icon from UI

By default, the icon to set aggregation type is enabled in the grouping bar. To disable this icon, set the property ShowValueTypeIcon in PivotViewGroupingBarSettings class to false.

NOTE

Icon to change the aggregation type can be hidden only in Grouping Bar but not in Field List at the moment.

@using Syncfusion.Blazor.PivotView

<SfPivotView TValue="ProductDetails" ShowGroupingBar="true">
    <PivotViewDataSourceSettings DataSource="@data">
        <PivotViewColumns>
            <PivotViewColumn Name="Year"></PivotViewColumn>
            <PivotViewColumn Name="Quarter"></PivotViewColumn>
        </PivotViewColumns>
        <PivotViewRows>
            <PivotViewRow Name="Country"></PivotViewRow>
            <PivotViewRow Name="Products"></PivotViewRow>
        </PivotViewRows>
        <PivotViewValues>
            <PivotViewValue Name="Sold" Caption="Unit Sold"></PivotViewValue>
            <PivotViewValue Name="Amount" Caption="Sold Amount"></PivotViewValue>
        </PivotViewValues>
        <PivotViewFormatSettings>
            <PivotViewFormatSetting Name="Amount" Format="C"></PivotViewFormatSetting>
        </PivotViewFormatSettings>
    </PivotViewDataSourceSettings>
    <PivotViewGroupingBarSettings ShowValueTypeIcon="false"></PivotViewGroupingBarSettings>
</SfPivotView>

@code{
    public List<ProductDetails> data { get; set; }
    protected override void OnInitialized()
    {
        this.data = ProductDetails.GetDefaultData().ToList();
        //Bind the data source collection here. Refer "Assigning sample data to the pivot table" section in getting started for more details.
    }
}

Events

OnActionBegin

The event OnActionBegin triggers when clicking and selecting the aggregate type via the dropdown icon in the value field button, which is present in both grouping bar and field list UI. This allows user to identify the current action being performed at runtime. It has the following parameters:

DataSourceSettings: It holds the current data source settings such as input data source, rows, columns, values, filters, format settings and so on.
ActionName: It holds the name of the current action began. For example, while performing aggregation, the action name will be shown as Aggregate field.
FieldInfo: It holds the selected value field information.

NOTE

This option is applicable only when the field based UI actions are performed such as filtering, sorting, removing field from grouping bar, editing and aggregation type change.

Cancel: It allows user to restrict the current action.

In the following example, action taken during aggregation type selection via dropdown icon can be restricted by setting the args.Cancel option to true in the OnActionBegin event.

@using Syncfusion.Blazor.PivotView

<SfPivotView TValue="ProductDetails" ShowFieldList="true" ShowGroupingBar="true">
     <PivotViewDataSourceSettings DataSource="@data">
        <PivotViewColumns>
            <PivotViewColumn Name="Year"></PivotViewColumn>
            <PivotViewColumn Name="Quarter"></PivotViewColumn>
        </PivotViewColumns>
        <PivotViewRows>
            <PivotViewRow Name="Country"></PivotViewRow>
            <PivotViewRow Name="Products"></PivotViewRow>
        </PivotViewRows>
        <PivotViewValues>
            <PivotViewValue Name="Sold" Caption="Unit Sold"></PivotViewValue>
            <PivotViewValue Name="Amount" Caption="Sold Amount"></PivotViewValue>
        </PivotViewValues>
        <PivotViewFormatSettings>
            <PivotViewFormatSetting Name="Amount" Format="C"></PivotViewFormatSetting>
        </PivotViewFormatSettings>
    </PivotViewDataSourceSettings>
   <PivotViewEvents TValue="PivotProductDetails" OnActionBegin="ActionBegin"></PivotViewEvents>
</SfPivotView>

@code{
    private List<ProductDetails> data { get; set; }
    protected override void OnInitialized()
    {
        data = ProductDetails.GetProductData().ToList();
        //Bind the data source collection here. Refer "Assigning sample data to the pivot table" section in getting started for more details.
    }
    // Triggers when the UI action begins.
    public void ActionBegin(PivotActionBeginEventArgs args)
    {
        if(args.ActionName == "Aggregate field")
        {
          args.Cancel = true;
        }       
    }
}

OnActionComplete

The event OnActionComplete triggers when a UI action, such as applying aggregation using the dropdown icon via the value field button, which is present in both the grouping bar and the field list UI, is completed. This allows user to identify the current UI action being completed at runtime. It has the following parameters:

DataSourceSettings: It holds the current data source settings such as input data source, rows, columns, values, filters, format settings and so on.
ActionName: It holds the name of the current action completed. For example, after completing the aggregation, the action name will be shown as Field aggregated.
FieldInfo: It holds the selected value field information.