Features

Calculated Aggregates

Calculated Aggregates

The PivotEngine support GetAggregateValue function in PivotField to calculate aggregate field for each summary row.

Features

header
header
header
header
Product
Date
Range
header
Sales (Sum)
Downloads (Sum)
Conversion (Sum)
Sales:0;
Downloads:0;
Conversion:0;
2,511,747
2,461,186
102%
603,900
627,095
96%
317,830
309,708
103%
171,718
101,628
169%
34,000
88,936
38%
112,112
119,144
94%
286,070
317,387
90%
149,165
99,567
150%
20,530
94,068
22%
116,375
123,752
94%
593,003
575,270
103%
267,273
256,800
104%
169,075
81,940
206%
25,484
109,337
23%
72,714
65,523
111%
325,730
318,470
102%
154,623
86,934
178%
32,348
97,838
33%
138,759
133,698
104%
642,258
579,628
111%
286,159
257,741
111%
163,780
86,790
189%
26,011
81,872
32%
96,368
89,079
108%
356,099
321,887
111%
200,039
142,930
140%
20,015
49,754
40%
136,045
129,203
105%
672,586
679,193
99%
382,114
398,912
96%
167,073
84,280
198%
36,240
123,811
29%
178,801
190,821
94%
290,472
280,281
104%
145,645
65,852
221%
27,944
107,757
26%
116,883
106,672
110%

Description

PivotField objects have two properties as function that support custom calculations:
  • The GetValue function takes a data item as a parameter and returns a value that is calculated based on other properties of the data item. The function has no access to any aggregate information.
  • The GetAggregateValue function takes a summary row as a parameter and returns a value to be displayed as an aggregate for the field. The function has no access to the individual/raw data items.
This sample uses the GetValue function to calculate a Range field that categorizes raw sales value into three levels: "High", "Medium", or "Low".
And uses GetAggregateValue function to calculate a Conversion field that shows the Sales/Downloads ratio for each summary row.
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using OlapExplorer.Models;
using System.Collections;
using Microsoft.AspNetCore.Mvc;
using System.Linq;
using System.Collections.Generic;
using C1.Web.Mvc.Olap;
  
namespace OlapExplorer.Controllers.Olap
{
    public partial class OlapController : Controller
    {
        // GET: PivotGrid
        public ActionResult CalculatedAggregates()
        {
            return View(ProductData.GetData(500));
        }
    }
}
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@using C1.Web.Mvc.Grid
@model IEnumerable<ProductData>
  
<c1-pivot-engine id="pvEngine" show-row-totals="Subtotals" show-column-totals="Subtotals" totals-before-data="true">
    <c1-items-source source-collection="Model"></c1-items-source>
    <c1-pivot-field-collection>
        <c1-pivot-field header="Country" binding="Country"></c1-pivot-field>
        <c1-pivot-field header="Product" binding="Product"></c1-pivot-field>
    <c1-pivot-field header="Date" binding="Date" format=@("yyyy \"Q\"q")></c1-pivot-field>
        <c1-pivot-field header="Range" type="DataType.String" aggregate="Cnt" get-value="getValue"></c1-pivot-field>
        <c1-pivot-field header="Sales" binding="Sales" format="n0"></c1-pivot-field>
        <c1-pivot-field header="Downloads" binding="Downloads" format="n0"></c1-pivot-field>
    <c1-pivot-field header="Conversion" type="DataType.Number" get-aggregate-value="getAggregateValue" format="p0"></c1-pivot-field>
    </c1-pivot-field-collection>
    <c1-view-field-collection c1-property="RowFields" items="Product,Date,Range"></c1-view-field-collection>
    <c1-view-field-collection c1-property="ValueFields" items="Sales,Downloads,Conversion"></c1-view-field-collection>
</c1-pivot-engine>
  
<div class="row">
    <div class="col-sm-4 col-md-4">
        <c1-pivot-panel id="pvPanel" items-source-id="pvEngine"></c1-pivot-panel>
    </div>
    <div class="col-sm-8 col-md-8">
        <c1-pivot-grid id="pvGrid" items-source-id="pvEngine" outline-mode="false" show-value-field-headers="false"></c1-pivot-grid>
    </div>
</div>
  
@section Scripts{
    <script type="text/javascript">
        function getValue(item) {
            let sales = item.Sales;
            return sales <= 3000 ? 'Low' : sales <= 7000 ? 'Medium' : 'High';
        }
  
        function getAggregateValue(row) {
            return row.Downloads ? row.Sales / row.Downloads : 0;
        }
    </script>
}
  
@section Settings{
}
  
@section Description{
  
        @Html.Raw(OlapRes.CalculatedAggregates_Text1)
  <ul>
    <li>@Html.Raw(OlapRes.CalculatedAggregates_Text2)</li>
    <li>@Html.Raw(OlapRes.CalculatedAggregates_Text3)</li>
  </ul>
    @Html.Raw(OlapRes.CalculatedAggregates_Text4)
  <br />
    @Html.Raw(OlapRes.CalculatedAggregates_Text5)
  
}
  
@section Summary{
    <p>@Html.Raw(OlapRes.CalculatedAggregates_Text0)</p>
}