How to be able to select a row and also have double click working?

The row double click is not enabled by default. If you enable it using rowDoubleClickHandling = "Enabled" you'll be able to use both single and double click event handlers:

https://api.daypilot.org/daypilot-scheduler-rowdoubleclickhandling/

Just note that if the double click is enabled there will be a delay of 300 ms (https://api.daypilot.org/daypilot-scheduler-doubleclicktimeout/) before the single click event handler is fired.

I have double click working fine for me, but I would like both (e.g. single click selects the row) and the double click executing some action. I'll re-try today, but if you can make a working sample of having both working, that would be great.

This seems to work fine:

dp.rowClickHandling = "Select";
dp.rowDoubleClickHandling = "Enabled";
dp.onRowDoubleClick = function(args) {
  alert("double clicked");
};

Please let me know if it doesn't work as expected.

You're right, it does seem to work fine (not sure what did I wrong originally in my tests). Wondering if there are some properties associated with the selected row I can use (say, selectedIndex or something along the lines)?

Also, I will need to research how to make this highlight light blue.