caret posiiton

caret-helpers.js

function getCaretPosition (value) {

  // Initialize
  let iCaretPos = 0;
  const field = document.activeElement;

  // IE Support
  if (document.selection) {

    // To get cursor position, get empty selection range
    const oSel = document.selection.createRange();

    // Move selection start to 0 position
    oSel.moveStart('character', -value.length);

    // The caret position is selection length
    iCaretPos = oSel.text.length;
  }

  // Firefox support
  else if (field.selectionStart || field.selectionStart === 0)
    iCaretPos = field.selectionStart;

  // Return results
  return iCaretPos;
}

function setCaretPosition(caretPos) {
    var elem = document.activeElement;

    if(elem != null) {
        if(elem.createTextRange) {
            var range = elem.createTextRange();
            range.move('character', caretPos);
            range.select();
        }
        else {
            if(elem.selectionStart) {
                elem.setSelectionRange(caretPos, caretPos);
            }
        }
    }
}