JavaScript Data GridSparklines - Line Customisation

This section shows how Line Sparklines can be customised by overriding the default line options.

The following Line Sparkline Options can be used to customise Line Sparklines:

• Line Options
• Marker Options
• Crosshairs Options
• Sparkline Padding Options

Also see Additional Customisations for more advanced customisations that are common across all sparklines.

The snippet below shows option overrides for the Line Sparkline:

sparklineOptions: {
    type: 'line',
    line: {
        stroke: 'rgb(124, 255, 178)',
        strokeWidth: 2,
    },
    padding: {
        top: 5,
        bottom: 5,
    },
    highlightStyle: {
        size: 7,
        fill: 'rgb(124, 255, 178)',
        strokeWidth: 0
    },
}

The following example demonstrates the results of the Line Sparkline options above:

Line Options

To apply custom stroke and strokeWidth attributes to the line, set these properties under line options as shown:

sparklineOptions: {
    type: 'line',
    // Customise the line path in the sparkline.
    line: {
        stroke: 'orange',
        strokeWidth: 2,
    },
}

The result of the above configuration is displayed below on the right, compared with default line options on the left.

Default

Custom line

Marker Options

The markers are enabled by default but the size has been set to 0px, making them invisible.

The size property in the highlightStyle options is 6px by default, allowing the markers to become visible when in the highlighted state.

These formats can be modified to your liking by setting the marker and highlightStyle options as demonstated below.

sparklineOptions: {
    type: 'line',
    marker: {
        size: 3,
        shape: 'diamond',
        fill: 'green',
        stroke: 'green',
        strokeWidth: 2
    },
    highlightStyle: {
        size: 10,
        fill: 'cyan',
        stroke: 'cyan',
    },
}

• In the snippet above, we have configured the marker size to be 3px in the un-highlighted normal state, and 10px in the highlighted state.
• Note that the fill and stroke are also different depending on the highlighted state of the marker.

The result of the above configuration is displayed below, compared with default marker options in the first sparkline.

Default

Custom marker

Custom highlighted marker

Crosshairs Options

Crosshairs display a vertical and horizontal line running across the sparklines when hovering on a data point. When the mouse is moved, the crosshairs will snap to the closest data point.

By default, the vertical crosshair line has been enabled for line sparklines and is displayed as a solid grey line.

The horizontal and vertical crosshair lines can be enabled or disabled independently by adding crosshairs options as shown below:

sparklineOptions: {
    crosshairs: {
        xLine: {
            enabled: false // enabled by default, set to false to remove the default vertical crosshair line
        },
        yLine: {
            enabled: false // disabled by default, set to true to enable the horizontal crosshair line
        }
    }
}

The style of the crosshair line, including stroke, strokeWidth, lineDash and lineCap, can be customised via the xLine and yLine options:

sparklineOptions: {
    crosshairs: {
        xLine: {
            enabled: true, // enabled by default
            lineDash: 'dash',
            stroke: '#999',
        },
        yLine: {
            enabled: true,
            lineDash: 'dash',
            stroke: '#999',
        },
    }
}

Below is an example to show crosshair customisation. Note that:

• The sparklines in the Change column have been configured so that both the vertical and horizontal crosshairs (xLine and yLine) are displayed as a dashed grey line.
• The sparklines in the Rate Of Change column have been configured so that no crosshairs are displayed when the sparklines are hovered.

Sparkline Padding Options

To add extra space around the sparklines, custom padding options can be applied in the following way.

sparklineOptions: {
    type: 'line',
    // Adjust the padding around the sparklines.
    padding: {
        top: 10,
        right: 5,
        bottom: 10,
        left: 5
    },
}

• The top, right, bottom and left properties are all optional and can be modified independently.

Default padding

Custom padding

Additional Customisations

More advanced customisations are discussed separately in the following sections:

• Axis - configure the axis type via axis options.
• Tooltips - configure tooltips using tooltip options.
• Points of Interest - configure individual points of interest using a formatter.

Next Up

Continue to the next section to learn about: Sparkline Data.