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  1. API reference
  2. Welcome
    1. Getting started
    2. Get Flexmonster
    3. Quick start
    4. System requirements
    5. Troubleshooting
    6. Managing license keys
    7. Migrating from WebDataRocks to Flexmonster
  3. Integration with frameworks
    1. Available tutorials
    2. Integration with Angular
    3. Integration with React
    4. Integration with Vue
    5. Other integrations
      1. Integration with Python
        1. Integration with Django
        2. Integration with Jupyter Notebook
      2. Integration with React Native
      3. Integration with AngularJS (v1.x)
      4. Integration with TypeScript
      5. Integration with R Shiny
      6. Integration with jQuery
      7. Integration with Ionic
      8. Integration with Electron.js
      9. Integration with Webpack
      10. Integration with RequireJS
  4. Connecting to Data Source
    1. Supported data sources
    2. JSON
      1. Connecting to JSON
      2. Connecting to JSON using Flexmonster Data Server
      3. Data types in JSON
    3. CSV
      1. Connecting to CSV
      2. Connecting to CSV using Flexmonster Data Server
      3. Data types in CSV
    4. Database
      1. Connecting to SQL databases
      2. Connecting to a MySQL database
      3. Connecting to a Microsoft SQL Server database
      4. Connecting to a PostgreSQL database
      5. Connecting to an Oracle database
    5. Flexmonster Data Server
      1. Getting started with Flexmonster Data Server
      2. Installation guide
      3. Configurations reference
      4. Data sources guide
      5. Security and authorization guide
      6. The Data Server as a DLL
        1. Getting started with the Data Server as a DLL
        2. Referring the Data Server as a DLL
        3. Implementing the API controller
        4. Implementing the server filter
        5. Implementing the custom parser
        6. DLL configurations reference
        7. The controller's methods for request handling
      7. Troubleshooting the Data Server
    6. MongoDB
      1. Introduction to Flexmonster MongoDB Connector
      2. Getting started with the MongoDB Connector
      3. Embedding the MongoDB Connector into the server
    7. Microsoft Analysis Services
      1. Connecting to Microsoft Analysis Services
      2. Getting started with Flexmonster Accelerator
      3. Referring the Accelerator as a DLL
      4. Configuring the authentication process
      5. Configuring a secure HTTPS connection
      6. Troubleshooting
    8. Custom data source API
      1. Introduction to the custom data source API
      2. A quick overview of a sample Node.js server
      3. A quick overview of a sample .NET Core server
      4. Implement your own server
        1. Implementing the custom data source API server
        2. Implementing filters
        3. Supporting more aggregation functions
        4. Supporting multilevel hierarchies
        5. Returning data for the drill-through view
    9. Elasticsearch
      1. Connecting to Elasticsearch
      2. Configuring the mapping
    10. Pentaho Mondrian
      1. Connecting to Pentaho Mondrian
      2. Getting started with the Accelerator
      3. Configuring Mondrian roles
      4. Configuring username/password protection
      5. Configuring a secure HTTPS connection
      6. Troubleshooting
    11. Connecting to other data sources
  5. Security
    1. Security in Flexmonster
    2. Security aspects of connecting to an OLAP cube
      1. Ways of connecting to an OLAP cube
      2. The data transfer process
      3. Data security
      4. Data access management
  6. Configuring report
    1. What is a report
    2. Data source
    3. Slice
    4. Options
    5. Mapping
    6. Number formatting
    7. Conditional formatting
    8. Set the report for the component
    9. Get the report from the component
    10. Date and time formatting
    11. Configuring global options
    12. Export and print
    13. Calculated values
    14. Custom sorting
  7. Charts
    1. Available tutorials
    2. Flexmonster Pivot Charts
    3. Integration with Highcharts
    4. Integration with amCharts
    5. Integration with Google Charts
    6. Integration with FusionCharts
    7. Integration with any charting library
  8. Customizing
    1. Available tutorials
    2. Customizing the Toolbar
    3. Customizing appearance
    4. Customizing the context menu
    5. Customizing the grid
    6. Customizing the pivot charts
    7. Localizing the component
  9. Updating to the latest version
    1. Updating to the latest version
    2. Release notes
    3. Migration guide from 2.7 to 2.8
    4. Migration guide from 2.6 to 2.7
    5. Migration guide from 2.5 to 2.6
    6. Migration guide from 2.4 to 2.5
    7. Migration guide from 2.3 to 2.4
    8. Migration guide from 2.2 to 2.3
  10. Flexmonster CLI Reference
    1. Overview
    2. Troubleshooting the CLI
    3. flexmonster create
    4. flexmonster add
    5. flexmonster update
    6. flexmonster version
    7. flexmonster help
  11. Documentation for older versions
Table of contents

Supporting multilevel hierarchies

Flexmonster supports creating multilevel hierarchies from non-hierarchical data out of the box. To use this feature for the custom data source API, you need to handle certain request scenarios on your server. 

This guide describes how to support multilevel hierarchies on your server and configure them in the component.

Step 1. Implement advanced hierarchical filters

Hierarchies are composed on the client side while the server’s task is to filter them. For this purpose, your back end has to implement advanced hierarchical filters.

Flexmonster sends filters in /members and /select requests. The filters’ structure depends on the custom data source API version implemented by your server:

Version 2.8.22 or later

If the version sent in the /handshake response is 2.8.22 or later, your server should support a filter structure described by the Filter Group Object.

Version 2.8.5

In version 2.8.5, the Filter Object describes the structure of the filters sent by the component.

The include.filter and exclude.filter properties of the Filter Object are responsible for filtering hierarchical data. Therefore, implement them to enable the support of multilevel hierarchies on your server.

Step 2. Notify Flexmonster about implementing advanced filters

When the server implements hierarchical filters, it should inform the component about that. 

For this purpose, set the advanced property of the /fields request to true. The component will ignore multilevel hierarchies if the advanced property is set to false

Step 3. (optional) Handle the additional /select request

The component sends the additional /select request when the levelName property is defined in the slice. This request extracts members from the hierarchy level specified in levelName.

If you need the levelName property in your slice, handle the /select request for loading the required hierarchy levels.

Step 4. Configure the multilevel hierarchies

There are two ways to compose multilevel hierarchies:

On the client side

The Mapping Object is responsible for grouping data into hierarchies. Specify hierarchy and parent properties to structure the data.

The example below illustrates how to compose multilevel hierarchies in the report. Here, we create the "Item" hierarchy with the "Category" field as a first level and the "Color" field as a second level:

report: {
    dataSource: {
        type: "api",
        url: "your_url",
        index: "your_index",
        mapping: {
            "Category": {
                type: "string",
                hierarchy: "Item"
            },
            "Color": {
                type: "string",
                hierarchy: "Item",
                parent: "Category"
            }
       }

    },
    slice: {
        // your slice
    }
}

See a live example on JSFiddle.

On the server side

As an alternative to the Mapping Object, you can configure hierarchies right in the response to the /fields request. To do so, specify fields.hierarchy and fields.parent properties.

Here is an example of a /fields response where the "Category" and "Color" fields are grouped under the "Item" hierarchy (with "Category" as the top level of the hierarchy):


"fields":[
   {
     "uniqueName": "Category",
     "type": "string",
     "hierarchy": "Item"
   },
   {
      "uniqueName": "Color",
     "type": "string",
     "hierarchy": "Item",
     "parent": "Category"

   },
   ...
],
"aggregations":{
...
},
"filters":{
   ...
}
}

Now run your project and open the web page with Flexmonster – multilevel hierarchies should appear in the component.

What’s next?

You may be interested in the following articles: