react-date-picker/src/TimeInput/setCaretPosition.js

A carefully crafted date picker for React

export default function setCaretPosition(elem, caretPos) {
  let start = caretPos
  let end = caretPos

  if (caretPos && (caretPos.start != undefined || caretPos.end != undefined)){
    start = caretPos.start || 0
    end = caretPos.end || start
  }

  if (elem != null) {
    if(elem.createTextRange) {
      var range = elem.createTextRange()
      range.moveStart('character', start)
      range.moveEnd('character', end)
      range.select()
    } else {
      elem.focus()
      elem.setSelectionRange(start, end)
    }
  }
}