How to add text to dynamically added tinymce?

Question

JavaScript

tinyMCE.get('.text_edit_news-1').setContent("HELLO");

Throws an error
Uncaught TypeError: Cannot read property 'setContent' of null

Initialization is like this
tinymce.init({
selector: '.tinymceeditor', ...
Each textarea has an additional class text_edit_news-1, text_edit_news-2

After clicking the button, AJAX get the data and I want to drive them into the editor, but it does not work ...

Answer 1

Found an answer to your question.
It is necessary not to prescribe a class in the textarea, but to make the ID unique, after which it will be possible to access
it tinymce.get('text_edit_news-'+k).setContent(result[i].text);
where k is an index from the array :)
The error was that I was trying to access via a class even though tinymce documentation says ID and not class..