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

I tried all the answers here and they didn't work with jsTree (v3.3.4). What worked is the load_node.jstree event:

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