Aggregation

21 Dec 202221 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 support all aggregation types mentioned below except for “CalculatedField”. The fields with data type such as string, date, datetime, boolean, etc., support “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.
Median Displays the pivot table values with median.
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 value tag. Meanwhile, aggregation types like DifferenceFrom and PercentageOfDifferenceFrom can check for specific field of specific item using baseField and baseItem properties. Likewise, PercentageOfParentTotal type can for specific field using baseField property. For instance, the aggregation type 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.
<ejs-pivotview id="PivotView" height="300">
    <e-datasourcesettings dataSource="@ViewBag.DataSource" expandAll="false">
        <e-rows>
            <e-field name="Country"></e-field>
            <e-field name="Products"></e-field>
        </e-rows>
        <e-columns>
            <e-field name="Year" caption="Year"></e-field>
            <e-field name="Quarter"></e-field>
        </e-columns>
        <e-values>
            <e-field name="Sold" caption="Units Sold" type="DifferenceFrom" baseField="Country" baseItem="France"></e-field>
            <e-field name="Amount" caption="Sold Amount" type="Min"></e-field>
        </e-values>
    </e-datasourcesettings>
</ejs-pivotview>
public ActionResult Index()
{
    var data = GetPivotData();
    ViewBag.DataSource = data;
    return View();
}

output

NOTE

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

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.

output




output

Show desired aggregation types in its dropdown menu

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

<ejs-pivotview id="PivotView" height="300" showGroupingBar="true" aggregateTypes="@(new List<string> () {"DistinctCount","Avg","Product"})">
    <e-datasourcesettings dataSource="@ViewBag.DataSource" expandAll="false">
        <e-rows>
            <e-field name="Country"></e-field>
            <e-field name="Products"></e-field>
        </e-rows>
        <e-columns>
            <e-field name="Year" caption="Year"></e-field>
            <e-field name="Quarter"></e-field>
        </e-columns>
        <e-values>
            <e-field name="Sold" caption="Units Sold" type="DifferenceFrom" baseField="Country" baseItem="France"></e-field>
            <e-field name="Amount" caption="Sold Amount" type="Min"></e-field>
        </e-values>
    </e-datasourcesettings>
</ejs-pivotview>
public ActionResult Index()
{
    var data = GetPivotData();
    ViewBag.DataSource = data;
    return View();
}

output

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 e-datasourcesettings tag to false.

<ejs-pivotview id="PivotView" height="300">
    <e-datasourcesettings dataSource="@ViewBag.DataSource" expandAll="false" showAggregationOnValueField="false">
        <e-rows>
            <e-field name="Country"></e-field>
            <e-field name="Products"></e-field>
        </e-rows>
        <e-columns>
            <e-field name="Year" caption="Year"></e-field>
            <e-field name="Quarter"></e-field>
        </e-columns>
        <e-values>
            <e-field name="Sold" caption="Units Sold"></e-field>
            <e-field name="Amount" caption="Sold Amount" type="Sum"></e-field>
        </e-values>
    </e-datasourcesettings>
</ejs-pivotview>
public ActionResult Index()
{
    var data = GetPivotData();
    ViewBag.DataSource = data;
    return View();
}

output


output

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 e-groupingBarSettings tag to false.

NOTE

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

<ejs-pivotview id="PivotView" height="300">
    <e-datasourcesettings dataSource="@ViewBag.DataSource" expandAll="false" showAggregationOnValueField="false">
        <e-rows>
            <e-field name="Country"></e-field>
            <e-field name="Products"></e-field>
        </e-rows>
        <e-columns>
            <e-field name="Year" caption="Year"></e-field>
            <e-field name="Quarter"></e-field>
        </e-columns>
        <e-values>
            <e-field name="Sold" caption="Units Sold"></e-field>
            <e-field name="Amount" caption="Sold Amount" type="Sum"></e-field>
        </e-values>
    </e-datasourcesettings>
    <e-groupingBarSettings showValueTypeIcon="false"></e-groupingBarSettings>
</ejs-pivotview>
public ActionResult Index()
{
    var data = GetPivotData();
    ViewBag.DataSource = data;
    return View();
}

output

Event

AggregateCellInfo

The event aggregateCellInfo triggers every time while rendering each value cell. This allows user to change the cell value and skip formatting if applied. It has following parameters:

  • fieldName - It holds current cell’s field name.
  • row - It holds current cell’s row value.
  • column - It holds current cell’s row value.
  • value - It holds value of current cell.
  • cellSets - It holds raw data for the aggregated value cell.
  • rowCellType - It holds row cell type value.
  • columnCellType - It holds column cell type value.
  • aggregateType - It holds aggregate type of the cell.
  • skipFormatting - boolean property, it allows to skip formatting if applied.
<ejs-pivotview id="PivotView" height="300">
    <e-datasourcesettings dataSource="@ViewBag.DataSource" expandAll="false" showAggregationOnValueField="false">
        <e-rows>
            <e-field name="Country"></e-field>
            <e-field name="Products"></e-field>
        </e-rows>
        <e-columns>
            <e-field name="Year" caption="Year"></e-field>
            <e-field name="Quarter"></e-field>
        </e-columns>
        <e-values>
            <e-field name="Sold" caption="Units Sold"></e-field>
            <e-field name="Amount" caption="Sold Amount" type="Sum"></e-field>
        </e-values>
    </e-datasourcesettings>
    <e-groupingBarSettings showValueTypeIcon="false"></e-groupingBarSettings>
</ejs-pivotview>
public ActionResult Index()
{
    var data = GetPivotData();
    ViewBag.DataSource = data;
    return View();
}

ActionBegin

The event actionBegin 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 actionBegin event.

<ejs-pivotview id="PivotView" height="300" showGroupingBar="true" actionBegin="actionBegin">
    <e-datasourcesettings dataSource="@ViewBag.DataSource" expandAll="false" enableSorting="true">
        <e-rows>
            <e-field name="Country"></e-field>
            <e-field name="Products"></e-field>
        </e-rows>
        <e-columns>
            <e-field name="Year" caption="Year"></e-field>
            <e-field name="Quarter"></e-field>
        </e-columns>
        <e-values>
            <e-field name="Sold" caption="Units Sold" type="DifferenceFrom" baseField="Country" baseItem="France"></e-field>
            <e-field name="Amount" caption="Sold Amount" type="Min"></e-field>
        </e-values>
    </e-datasourcesettings>
</ejs-pivotview>

<script>
    function actionBegin(args) {
        if (args.actionName == 'Aggregate field') {
            args.cancel = true;
        }
    }
</script>
public ActionResult Index()
{
    var data = GetPivotData();
    ViewBag.DataSource = data;
    return View();
}

ActionComplete

The event actionComplete 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.

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.

<ejs-pivotview id="PivotView" height="300" showGroupingBar="true" actionComplete="actionComplete">
    <e-datasourcesettings dataSource="@ViewBag.DataSource" expandAll="false" enableSorting="true">
        <e-rows>
            <e-field name="Country"></e-field>
            <e-field name="Products"></e-field>
        </e-rows>
        <e-columns>
            <e-field name="Year" caption="Year"></e-field>
            <e-field name="Quarter"></e-field>
        </e-columns>
        <e-values>
            <e-field name="Sold" caption="Units Sold" type="DifferenceFrom" baseField="Country" baseItem="France"></e-field>
            <e-field name="Amount" caption="Sold Amount" type="Min"></e-field>
        </e-values>
    </e-datasourcesettings>
</ejs-pivotview>

<script>
    function actionComplete(args) {
        if (args.actionName == 'Field aggregated') {
            // Triggers when the aggregation type is applied.
        }
    }
</script>
public ActionResult Index()
{
    var data = GetPivotData();
    ViewBag.DataSource = data;
    return View();
}

ActionFailure

The event actionFailure triggers when the current UI action fails to achieve the desired result. It has the following parameters:

  • actionName: It holds the name of the current action failed. For example, if the action fails while performing the aggregation, then the action name will be shown as Aggregate field.

  • errorInfo: It holds the error information of the current UI action.

<ejs-pivotview id="PivotView" height="300" showGroupingBar="true" actionFailure="actionFailure">
    <e-datasourcesettings dataSource="@ViewBag.DataSource" expandAll="false" enableSorting="true">
        <e-rows>
            <e-field name="Country"></e-field>
            <e-field name="Products"></e-field>
        </e-rows>
        <e-columns>
            <e-field name="Year" caption="Year"></e-field>
            <e-field name="Quarter"></e-field>
        </e-columns>
        <e-values>
            <e-field name="Sold" caption="Units Sold" type="DifferenceFrom" baseField="Country" baseItem="France"></e-field>
            <e-field name="Amount" caption="Sold Amount" type="Min"></e-field>
        </e-values>
    </e-datasourcesettings>
</ejs-pivotview>

<script>
    function actionFailure(args) {
        if (args.actionName == 'Aggregate field') {
            // Triggers when the current UI action fails to achieve the desired result.
        }
    }
</script>
public ActionResult Index()
{
    var data = GetPivotData();
    ViewBag.DataSource = data;
    return View();
}