jQuery insertAtCaret CoffeeScript

insertAtCaret.js.coffee

jQuery.fn.extend insertAtCaret: (myValue) ->
  @each (i) ->
    if document.selection
      # For browsers like Internet Explorer
      @focus()
      sel = document.selection.createRange()
      sel.text = myValue
      @focus()
    else if @selectionStart or @selectionStart is "0"
      # For browsers like Firefox and Webkit based
      startPos = @selectionStart
      endPos = @selectionEnd
      scrollTop = @scrollTop
      @value = @value.substring(0, startPos) + myValue + @value.substring(endPos, @value.length)
      @focus()
      @selectionStart = startPos + myValue.length
      @selectionEnd = startPos + myValue.length
      @scrollTop = scrollTop
    else
      @value += myValue
      @focus()