Example of label callback

[lukarolak]

Hi, could you create an example where the formatter uses a callback to format text per series element?

charts.WithLabelOpts(
		opts.Label{
			Show:      true,
			Formatter: callback?,
		},
	)

[shmarlovsky]

@lukarolak
Function callback can be provided with
chart.AddCustomJS()
Example:

func makeLine() {
        ....
	line.AddCustomJS(customTooltipFormatter(line.ChartID))
	return line
}

func customTooltipFormatter(chartID string) string {

	formatterFunc := `
	function (params) {
		<callback function body>
	`
	return fmt.Sprintf(
		`goechart_%s.setOption({"tooltip": {"formatter": %s}});`,
		chartID,
		formatterFunc,
	)
}

[lukarolak]

@shmarlovsky Thanks a lot!