How do I open all nodes in jquery Jstree?

Question

I am using the following code:

$("#treeview").jstree();
$("#treeview").jstree(\'open_all\');

With the following html:

Answer 1

use simple code

$(".jstree").jstree().on('loaded.jstree', function () {
     $(".jstree").jstree('open_all');
})