Option to make a custom time marker title editable

[ryamaguchi0220]

Once a custom time marker is added, the custom time marker title can't be edited anymore.
This means that we need to remove and re-add it to change the title.
I think it would be a good idea to add an option to make a custom time marker title editable.

[callmeteus]

I had the same problem, had to do a workaround for it:

1. Add a unique class to the time marker
2. Listen once to the "changed" event
3. Get the DOM element with the given class
4. Change the DOM element title

For example, assuming there is a timeline with var name "timeline", and a dataset with var name "items":

const onChange = () => {
timeline.off("changed", onChange);

document.querySelector(".unique-class-name").setAttribute("title", "New element title");
};

timeline.on("changed", onChange);

items.add({
 start: 1,
 end: 5,
 content: "Test",
 className: "unique-class-name"
});

[ryamaguchi0220]

@theprometeus Thank you for sharing the workaround.
However, this issue mentions the custom time marker's title which was added by #86, not the custom time's title.

[mojoaxel]

It would be nice to have a custom events that gets fired every time a marker was edited. That way these edits could be saved or something!

[ryamaguchi0220]

@mojoaxel I think so too.
I'm going to do it after this issue gets resolved.