I've enabled the legend on a amCharts v4 chart with the following code but I have issues with ellipsis:
// Add legend
chart.legend = new am4charts.Legend();
chart.legend.fontSize = 11;
// Truncate long labels (more than 160px)
chart.legend.labels.template.maxWidth = 160;
chart.legend.labels.template.truncate = true;
chart.legend.labels.template.fullWords = true;
// Set custom ellipsis as default one is not displayed correctly
chart.legend.labels.template.ellipsis = "...";
// Set tooltip content to name field
chart.legend.itemContainers.template.tooltipText = "{name}";
As you can see I had to set a custom ellipsis property because Firefox v76 displayed €| instead of … on the truncated legend labels. It happens even on the sample on the amChart website but, surprisingly, not if I open the same URL in a private tab... How can I fix that?
Then I would like to display the tooltip on the legend only for truncated labels. Adding an adapter:
chart.legend.itemContainers.template.adapter.add("tooltipText", function(text, target) {
// 'text' here contains the non-truncated string
return "My modified " + text;
})
of course works, but how can I identify inside the adapter code if the label that I'm processing is truncated and clear the text variable? It doesn't make sense to display tooltips for non-truncated legend items.
I found the answer about the tooltip adapter; this works:
chart.legend.itemContainers.template.adapter.add("tooltipText", function(text, target) {
if (!target.dataItem.label.isOversized) {
// Legend label is NOT truncated, disable the tooltip
return "";
}
// Legend label is truncated, display the tooltip
return text;
})
Still I don't know why the ellipsis are not displayed correctly without setting the property...