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Combo charts combine multiple chart types with two y-axes, allowing you to compare metrics with different units or scales.

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When to use

  • Different units - Compare metrics measured in different units (e.g., revenue in £ vs conversion rate in %)
  • Different scales - Display values with vastly different magnitudes
  • Correlation analysis - Show relationships between two different metrics

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Basic example

const config: GraphConfig = {
  type: 'combo',
  data: {
    columns: [
      { key: 'month', label: 'Month' },
      { key: 'revenue', label: 'Revenue (£)' },
      { key: 'conversion', label: 'Conversion rate (%)' }
    ],
    rows: [
      { month: 'Jan', revenue: 50000, conversion: 2.5 },
      { month: 'Feb', revenue: 55000, conversion: 2.8 },
      { month: 'Mar', revenue: 62000, conversion: 3.1 },
      { month: 'Apr', revenue: 58000, conversion: 2.9 },
      { month: 'May', revenue: 68000, conversion: 3.4 }
    ]
  }
};

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Dual y-axes

By default, combo charts show two y-axes:
  • Left axis (primary) - First numeric series
  • Right axis (secondary) - Second numeric series

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Configuring axes

const config: GraphConfig = {
  type: 'combo',
  axes: {
    y: {
      label: 'Revenue (£)'
    },
    y2: {
      label: 'Conversion rate (%)'
    }
  },
  data: { /* ... */ }
};

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Single y-axis

Disable the dual y-axis mode if your series share the same scale: 
const config: GraphConfig = {
  type: 'combo',
  axes: {
    hasDualYAxis: false
  },
  data: { /* ... */ }
};

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Options

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options.comboType
'grouped-bars' | 'stacked-bars' | 'lines'
default:"grouped-bars"
Determines how to display the combo chart:
  • 'grouped-bars' - Show series as grouped bars side-by-side
  • 'stacked-bars' - Stack bars on top of each other
  • 'lines' - Display all series as lines

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Display as lines

const config: GraphConfig = {
  type: 'combo',
  options: {
    comboType: 'lines'
  },
  data: { /* ... */ }
};