How do I open all nodes in jquery Jstree?

The jsTree documentation is “sub optimal”. The docs don’t clearly state that the initialization works asynchronously. There’s core.loaded():

A dummy function, whose purpose is only to trigger the loaded event. This event is triggered once after the tree’s root nodes are loaded, but before any nodes set in initially_open are opened.

This suggests an event loaded.jstree is fired after the tree is setup. You can hook into that event to open all your nodes:

var $treeview = $("#treeview");
$treeview
  .jstree(options)
  .on('loaded.jstree', function() {
    $treeview.jstree('open_all');
  });