app/Resources/static-src/libs/jquery-insertAtCaret.js

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jQuery.fn.extend({
  insertAtCaret: function(myValue){
    return this.each(function(i) {
      if (document.selection) {
        //For browsers like Internet Explorer
        this.focus();
        sel = document.selection.createRange();
        sel.text = myValue;
        this.focus();
      }
      else if (this.selectionStart || this.selectionStart == '0') {
        //For browsers like Firefox and Webkit based
        var startPos = this.selectionStart;
        var endPos = this.selectionEnd;
        var scrollTop = this.scrollTop;
        this.value = this.value.substring(0, startPos) + myValue + this.value.substring(endPos, this.value.length);
        this.focus();
        this.selectionStart = startPos + myValue.length;
        this.selectionEnd = startPos + myValue.length;
        this.scrollTop = scrollTop;
      } else {
        this.value += myValue;
        this.focus();
      }
    });
  }
});