When highlighting a line chart's data using the following:

$('#jqChart').jqChart('highlightData', dataToHighlight);

any data point with an equal value is highlighted.

So, if you have the following data:

0, 1, 3, 0, 7

and you want to highlight the first data point (0), so you push that value (0) into dataToHighlight, when the chart highlights, both the first and fourth data points (both with 0 value) highlight.

Is there a method to uniquely identify data points for highlighting?

Unfortunately, my current example is very complex and not easily broken down. But, if you create a simple line chart with some duplicate values, and then ask the chart to highlight a value (which has duplicates), all data items with that value will highlight instead of one particular data point of interest.