How insert the content with JavaScript ( textarea ).

For sample textarea and wordpress visual editor I use the code

var code = mythemes_get_shortcode( sh ); // return [posts count="3"/]

jQuery(function(){
if( jQuery( 'div#wp-content-wrap' ).length &&
    jQuery( 'div#wp-content-wrap' ).hasClass( 'html-active' ) ) {

  var text = jQuery( 'textarea#content' ).val();
  jQuery( 'textarea#content' ).val( text + code );
}
else{
  if( typeof tinyMCE == 'object' )
    tinyMCE.execCommand( 'mceInsertRawHTML', false, code );
  }
});

When is installed the WP Editor plugin I try to use an additional code for the case with the textarea.

var mythemes_sh_editor;

...

if( jQuery( 'div#wp-content-wrap' ).length &&
    jQuery( 'div#wp-content-wrap' ).hasClass( 'html-active' ) ) {

  var text = jQuery( 'textarea#content' ).val();
  jQuery( 'textarea#content' ).val( text + code );

  if( typeof CodeMirror == 'function' &&
      typeof mythemes_editor == 'undefined' ){

    var textArea = document.getElementById('content');
    var mythemes_editor = CodeMirror.fromTextArea( textArea );
    mythemes_editor.getDoc().setValue( text + code );
  }
  else if( typeof CodeMirror == 'function' ){
    mythemes_editor.getDoc().setValue( text + code );
  }
}
...

but unfortunately it does not work.

please, can you help me to make it to work correctly.

https://ww.wp.xz.cn/plugins/wp-editor/