app/views/layouts/_scripts.html.erb
<script type="text/javascript">
if (localStorage['_navbar_collapsed'] == null) localStorage['_navbar_collapsed'] = '0';
if (localStorage['_navbar_collapsed'] == '1') {
$('#main-body').addClass('sidebar-collapse');
} else {
$('#main-body').removeClass('sidebar-collapse');
}
$('#main-sidebar-toggle').click(function () {
if (localStorage['_navbar_collapsed'] == '0') {
localStorage['_navbar_collapsed'] = '1';
} else if (localStorage['_navbar_collapsed'] == '1') {
localStorage['_navbar_collapsed'] = '0';
} else
{
localStorage['_navbar_collapsed'] = '0';
}
});
</script>