title as function

[ataft]

Would you accept a PR to allow the title option as a function?

The use case is to display something different for the button text and the button title, like this:

The logic is very simple and non-intrusive:

      if(typeof this.options.title === 'function') {
        button.title = this.options.title(selectedOptions, selectedCount, totalCount);
      } else {
        // strip all HTML tags and trim the result, then unescape any escaped tags
        button.title = titleFragment.textContent.replace(/<[^>]*>?/g, '').trim();
      }

[caseyjhol]

Hold off on this for now. We're in the process of replacing title with a placeholder option instead ("title" will be deprecated). The title option as we now know it will be removed in v2.0.0 and be replaced with normal title attribute functionality.

Follow #2147 and #2369.