VueJs

// methods:
insertSomething: function(insert) {
  const self = this;
  var tArea = this.$refs.yourTextarea;
  // filter:
  if (0 == insert) {
    return;
  }
  if (0 == cursorPos) {
    return;
  }

  // get cursor's position:
  var startPos = tArea.selectionStart,
    endPos = tArea.selectionEnd,
    cursorPos = startPos,
    tmpStr = tArea.value;

  // insert:
  self.txtContent = tmpStr.substring(0, startPos) + insert + tmpStr.substring(endPos, tmpStr.length);

  // move cursor:
  setTimeout(() => {
    cursorPos += insert.length;
    tArea.selectionStart = tArea.selectionEnd = cursorPos;
  }, 10);
}

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