These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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Optional formatter callback for the announcement. Receives
up to three arguments. The first argument is always an array
of all series that received updates. If an announcement is
already queued, the series that received updates for that
announcement are also included in this array. The second
argument is provided if
chart.addSeries was called, and
there is a new series. In that case, this argument is a
reference to the new series. The third argument, similarly,
is provided if
series.addPoint was called, and there is a
new point. In that case, this argument is a reference to the
The function should return a string with the text to announce
to the user. Return empty string to not announce anything.
false to use the default announcement format.