score:1

Accepted answer

you should use tooltiptemplate option:

var options = {
    // string - template string for single tooltips
    tooltiptemplate: "<%= label %> january: <%= value %>"
};

window.myline = new chart(ctx).line(data, options);

here is sample: https://jsfiddle.net/wckfhrsa/7/

also, check more tooltip options global chart configuration


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