You may also want to read the documentation on select_branch, deselect_branch and type clickable setting. To initially select some nodes when the tree loads - take a look at the selected config option. When selecting/deselecting the beforechange, onchange, onselect and ondeselect callbacks are triggered.
1.
$(
function
() {
2.
$(
"#demo_1"
).tree();
3.
});
1.
<
input
type
=
"button"
onclick
=
"$.tree.focused().select_branch("
#phtml_2");"
value
=
"Select"
>
2.
<
input
type
=
"button"
onclick
=
"$.tree.focused().deselect_branch("
#phtml_2");"
value
=
"Deselect"
>