Inserting a new text at given cursor position

Question

I am working on customizing the codemirror for my new language mode. As part of this new mode implementation, I am writing a new tool bar where user can select some text and

Answer 1

How about replaceSelection (http://codemirror.net/doc/manual.html#replaceSelection)?

doc.replaceSelection(replacement: string, ?select: string) Replace the selection(s) with the given string. By default, the new selection ends up after the inserted text. The optional select argument can be used to change this—passing "around" will cause the new text to be selected, passing "start" will collapse the selection to the start of the inserted text.