setContent of an textarea with tinyMCE

I think this will solve your problem

it works fine for TinyMCE v:4..

// Sets the HTML contents of the activeEditor editor
tinyMCE.activeEditor.setContent('<span>some</span> html');

// Sets the raw contents of the activeEditor editor
tinyMCE.activeEditor.setContent('<span>some</span> html', {format : 'raw'});

// Sets the content of a specific editor (my_editor in this example)
tinyMCE.get('my_editor').setContent(data); // here my_editor is the id of a specific editor

// Sets the bbcode contents of the activeEditor editor if the bbcode plugin was added
tinyMCE.activeEditor.setContent('[b]some[/b] html', {format : 'bbcode'});

the link for the code is TinyMCE setContent

For tinymce version 4,

tinymce.get('title').setContent(selected_article_title);

works just fine - also after initializing the editor.

In TinyMCE 5, you can do this using the setContent() method.

Let’s say you have initialized the editor on a textarea with id=”myTextarea”. First access the editor using that same id, then call setContent(). For example:

tinymce.get('myTextarea').setContent('<p>Hello world!</p>');

Or, instead of accessing the editor by id, you can access the active editor:

tinymce.activeEditor.setContent('<p>Hello world!</p>');

More info and examples here: https://www.tiny.cloud/blog/how-to-get-content-and-set-content-in-tinymce.

I have the solution (thans to Thariama who gives me some elements)

To set the content of an textarea using tinyMCE, we heve to fill in the textarea before init the tinyMCE. Also, the response is as follows:

1. Create the textarea:

   <textarea style="width: 95%;" name="Title"  id="title"></textarea>
   

2. Set the content of the textarea:

   $('#title').html(selected_article_title);
   

3. Init the tinyMCE:

   tinyMCE.init({
   // General options
   mode : "specific_textareas",
   theme : "advanced",
   width: "100%",
   plugins : "pagebreak,paste,fullscreen,visualchars",
   
   // Theme options
   theme_advanced_buttons1 : "code,|,bold,italic,underline,|,sub,sup,|,charmap,|,fullscreen,|,bullist,numlist,|,pasteword",
   theme_advanced_buttons2 :"",
   theme_advanced_buttons3 :"",
   theme_advanced_buttons4 :"",
   theme_advanced_toolbar_location : "top",
   theme_advanced_toolbar_align : "left",
   theme_advanced_statusbar_location : "bottom",
   valid_elements : "i,sub,sup",
   invalid_elements : "p, script",
   editor_deselector : "mceOthers"
   });
   

And it's done ! Enjoy.