js вставка текста в позицию курсора

js-Вставка текста в позицию курсора

http://stackoverflow.com/questions/946534/insert-text-into-textarea-with-jquery/946556#946556

[code:]html[:code]
<textarea></textarea>
<button>insert</button>
[/code]

[code:]js[:code]
jQuery.fn.extend({
insertAtCaret: function(myValue){
  return this.each(function(i) {
    if (document.selection) {
      //For browsers like Internet Explorer
      this.focus();
      var 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();
    }
  });
}
});

$('button').click(function(){
    $('textarea').insertAtCaret( '12365' );
})
[/code]