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  1. API reference
  2. Welcome
    1. Introduction
    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. Angular
      1. Integration with Angular
      2. Flexmonster usage in Angular
    3. React
      1. Integration with React
      2. Flexmonster usage in React
    4. Vue
      1. Integration with Vue 2
      2. Flexmonster usage in Vue 2
      3. Integration with Vue 3
      4. Flexmonster usage in Vue 3
    5. Other integrations
      1. Integration with Python
        1. Integration with Django
        2. Integration with Jupyter Notebook
      2. Integration with React Native
      3. Integration with Blazor
      4. Integration with AngularJS (v1.x)
      5. Integration with TypeScript
      6. Integration with R Shiny
      7. Integration with jQuery
      8. Integration with Ionic
      9. Integration with Electron.js
      10. Integration with Webpack
      11. 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. Managing data presentation in JSON
    3. CSV
      1. Connecting to CSV
      2. Connecting to CSV using Flexmonster Data Server
      3. Managing data presentation 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. Introduction to Flexmonster Data Server
      2. Getting started with Flexmonster Data Server
      3. Flexmonster Admin Panel Guide
      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. Referencing 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. The Data Server as a console application
        1. Installing the Data Server as a console application
        2. Configurations reference
        3. Data sources guide
        4. Security and authorization guide
      8. 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
      4. Configuring the MongoDB Connector
    7. Microsoft Analysis Services
      1. Connecting to Microsoft Analysis Services
      2. Getting started with Flexmonster Accelerator
      3. Referencing 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
        6. Testing your custom data source API server
    9. Elasticsearch
      1. Connecting to Elasticsearch
      2. Configuring the mapping
    10. Connecting to other data sources
  5. Accessibility
    1. Accessibility overview
    2. Keyboard navigation
  6. Configuring the component
    1. Available tutorials
    2. Getting started with the report
    3. Configure the data source
      1. Data source
      2. Mapping
    4. Define which data to show
      1. Slice
      2. Custom sorting
      3. Calculated values
    5. Manage Flexmonster’s functionality
      1. Options
      2. Configuring global options
    6. Format fields
      1. Number formatting
      2. Date and time formatting
      3. Conditional formatting
  7. Saving component configs
    1. Available tutorials
    2. Save and restore the report
    3. Share the report
    4. Export and print
  8. 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
  9. 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
  10. 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
  11. Updating to the latest version
    1. Updating to the latest version
    2. Release notes
    3. Migration guide from 2.8 to 2.9
    4. Migration guide from 2.7 to 2.8
    5. Migration guide from 2.6 to 2.7
    6. Migration guide from 2.5 to 2.6
    7. Migration guide from 2.4 to 2.5
    8. Migration guide from 2.3 to 2.4
    9. Migration guide from 2.2 to 2.3
  12. Flexmonster CLI Reference
    1. Overview
    2. Troubleshooting the CLI
    3. flexmonster create
    4. flexmonster add
    5. flexmonster update
    6. flexmonster version
    7. flexmonster help
  13. Documentation for older versions
Table of contents

Customizing appearance

You can customize the appearance of Flexmonster using CSS — the same way as for regular HTML. Flexmonster offers predefined skins and provides their source code so you can quickly create custom ones.

Built-in themes

Flexmonster comes with a variety of predefined CSS themes:

Explore all available themes inside the flexmonster/theme/ folder or check out the Flexmonster themes demo. If no theme is specified, the component uses the default theme. Its CSS is available inside the flexmonster/flexmonster.css and flexmonster/flexmonster.min.css files. To apply a different theme, add the reference to the minified CSS file of the chosen theme. For example, to apply the lightblue theme, insert the following line of code:

<link rel="stylesheet" type="text/css" href="/theme/lightblue/flexmonster.min.css" />

To insert some other theme, just replace lightblue from the CSS reference with the name of the chosen theme. The 2.3-styled theme can be set like this:

<link rel="stylesheet" type="text/css" href="/theme/old/flexmonster.min.css" />

Check out the Flexmonster default theme in the pivot table demo.

Adding a custom theme

You can create your custom theme using the custom theme builder or manually.

Create using the theme builder

This guide will help you create a custom theme for Flexmonster using the theme builder.

Step 1. Download the .zip archive with the theme builder or clone it from GitHub with the following commands:

git clone
cd custom-theme-builder

Step 2. Install the npm packages described in package.json:

npm install

Step 3. In the custom-theme-builder/ folder, find and open the flexmonster.less file. It contains styles for Flexmonster. Feel free to adjust variable values and colors to your needs.

For example, let’s change font styles and the theme main color:

@font-family: serif;
@font-size: 15px;
@theme-color: antiquewhite;

Other CSS styles can be customized similarly. 

Step 4. Run the custom theme builder to generate CSS and minified CSS files for the theme:

npm start

As a result, the generated-theme/ folder with your custom theme files (flexmonster.css, flexmonster.min.css) will appear in custom-theme-builder/.

Step 5. Apply your theme to the component by including the CSS or minified CSS file:

<link rel="stylesheet" type="text/css"

Now launch the page from a browser — your custom theme is set for the component.

Create manually

Creating a custom theme manually involves the following steps:

Step 1. Inside the theme/ folder, make a copy of any folder with an existing theme (e.g., lightblue/).

Step 2. Rename the copied folder to a custom theme name.

Step 3. Replace the theme’s colors with your custom ones. There are several ways to achieve this:

  • The recommended way requires using a CSS pre-processor named Less. Set custom colors inside the flexmonster.less file from the custom theme’s folder.
    After replacing the necessary colors, compile flexmonster.less into flexmonster.css and flexmonster.min.css.
    More details about this compilation are available in the Less documentation.
  • The other option is to edit the colors inside the flexmonster.css file from your theme folder. This approach is not recommended because it complicates updating your own theme with the updates made in the component CSS.

Step 4. Add the reference to the CSS or to the minified CSS. This will apply your new theme:

<link rel="stylesheet" type="text/css" 

Further customization

To add custom CSS above basic styling, we suggest one of the following approaches:

  • If you use Less, we advise creating your own theme based on one of the existing ones. Create your own theme with the help of the adding your own theme guide. Then you can open your theme/your-new-theme/flexmonster.less file and write custom code at the bottom of this file, after the definition of the variables. This way our base Less file theme/flexmonster-base.less will remain unchanged and will not cause any issues during updating. Check out the example with custom Less code added on top of the orange theme. Open the theme/orange/flexmonster.less file and find the following lines:
    #fm-pivot-view .fm-grid-layout {
    border-right: 1px solid @theme-color-supersuperlight;
    border-bottom: 1px solid @theme-color-supersuperlight;

    This is custom code that redefines border color for header cells. This color is the same as for all other cells. But for the orange theme, the border color for header cells is set to @theme-color-supersuperlight. You can add other custom code the same way.

  • If you do not use Less, we recommend writing your custom CSS code in a separate file (e.g. my-flexmonster-styles.css) and to keep the original styles in flexmonster.css without changes. Take a look at the following example: how to add custom CSS for the grid. It demonstrates how grid colors can be changed via additional CSS.

The full list of examples with custom CSS is available on our examples page.

What’s next?

You may be interested in the following articles: