+{% block extrahead %}
+ <script src="/static/js/jquery.lazyload.js" type="text/javascript" charset="utf-8"></script>
+ <script type="text/javascript" charset="utf-8">
+ function aboveViewport(container, element, treshold) {
+ return $(container).offset().top >= $(element).offset().top + $(element).height() + treshold;
+ }
+
+ function belowViewport(container, element, treshold) {
+ return $(container).offset().top + $(container).height() + treshold <= $(element).offset().top;
+ }
+
+ var TRESHOLD = 600;
+ var lastScroll = -1000;
+
+ function checkScroll() {
+ console.log('checkScroll', $('#images').scrollTop(), lastScroll);
+
+ if (Math.abs($('#images').scrollTop() - lastScroll) > 300) {
+ console.log('checking!');
+
+ var container = $('#images');
+ lastScroll = container.scrollTop();
+
+ $('#images .image-box').each(function() {
+ if (aboveViewport(container, this, TRESHOLD)) {
+ $(this).html('loading...');
+ } else if (belowViewport(container, this, TRESHOLD)) {
+ $(this).html('loading...');
+ } else {
+ $(this).html('<img src="' + $(this).attr('src') + '" width="460" height="460"/>');
+ }
+ })
+ }
+ setTimeout(checkScroll, 2000);
+ }
+
+ $(function() {
+ $('#id_folders').change(function() {
+ $('#images').load('/images/' + $('#id_folders').val() + '/', function() {
+ lastScroll = -1000;
+ });
+ });
+
+ setTimeout(checkScroll, 2000);
+ });
+ </script>
+{% endblock extrahead %}
+