如何添加 \\n 进入按键

Question

I need add '\\n' to my text area tag when user press Enter key. Because default enter add only visual new string, if i copy text from text area in other place i have one string.
If i try

 $('.body__textarea').on('keydown', function (e) {
   if ( e.keyCode === 13 ) {
     e.preventDefault();
     const oldValue = $(this).val();
     const newValue = oldValue + '\n'
     $(this).val(newValue);
   }  
 })

New line adds in the end of string, but need where is caret.

Code example https://codepen.io/kostikovmu/pen/oNXqmoM

Answer 1

You should use <br>
instead of \\n

Answer 2

Solution for me was change "copy" event:

const source = document.querySelector('.body__textarea');

source.addEventListener('copy', (event) => {
  const selection = document.getSelection();
  event.clipboardData.setData('text/plain', selection.toString());
  event.preventDefault();
});