JavaScript ChartsNavigator

The navigator allows to zoom in on a portion of chart's data and then pan around the chart. This is useful in charts with lots of data and real-time charts where one wants to show a slice of time, for example sensor data for the last 20 minutes.

Enabling the Navigator

The navigator is disabled by default, to enable it add the following config to the chart:

navigator: {
  enabled: true
}

Example: Enabling the Navigator

Setting the Visible Range

By default the navigator shows the whole range of chart's data in the horizontal direction. The two properties that control the range of data to show are min and max, which default to 0 and 1, respectively.

The visible range is normalized to the [0, 1] interval. For example, to show the last quarter of the chart's data by default we can use the following config:

navigator: {
    min: 0.75,
    max: 1
}

Regardless of the initial visible range, the user will be able to adjust the range as they see fit by dragging the range handles inside the navigator.

Styling the Navigator

The navigator's height is configurable and affects chart's layout by leaving more or less vertical space for the series:

navigator: {
  height: 50
}

The navigator component has three subcomponents that can be styled independently:

• mask - the range mask
• minHandle - the min drag handle
• maxHandle - the max drag handle

The range mask shows the portion of the range selected, and the drag handles are used to adjust it.

All subcomponent configs are optional too and have default values that make the navigator look good in charts with both light and dark backgrounds.

Example: Navigator Styling

The example below uses various navigator configs (in a deliberately exaggerated way) to change the following visual attributes of the navigator:

• range mask's fill, fill opacity and stroke width
• fill and stroke colors of handles
• width, height and stroke width of the left handle
• the length of the left handle's grip lines and the distance between them

API Reference