lubuntu.me/plugins/so-widgets-bundle/base/js/meta-box-manager.js

/* globals jQuery */

//Catch Update button click and transform widgets post meta data before event is propagated.
(function ($) {
	$('#publish').click(
		function (event) {
			var data = {};
			var $el = $('#siteorigin-widgets-meta-box');
			// This uses the exact same code to extract the model from the view as in the admin.js so could do with some refactoring.
			$el.find('*[name]').each(function () {
				var $$ = $(this);
				var name = /[a-zA-Z0-9\-]+\[[a-zA-Z0-9]+\]\[(.*)\]/.exec($$.attr('name'));

				if (!name) {
					return;
				}

				name = name[1];
				var parts = name.split('][');

				// Make sure we either have numbers or strings
				parts = parts.map(function (e) {
					if (!isNaN(parseFloat(e)) && isFinite(e)) {
						return parseInt(e);
					}
					else {
						return e;
					}
				});

				var sub = data;
				for (var i = 0; i < parts.length; i++) {
					if (i === parts.length - 1) {
						// This is the end, so we need to store the actual field value here
						if ($$.attr('type') === 'checkbox') {
							if ($$.is(':checked')) {
								sub[parts[i]] = $$.val() !== '' ? $$.val() : true;
							} else {
								sub[parts[i]] = false;
							}
						}
						else if ($$.attr('type') === 'radio') {
							if ($$.is(':checked')) {
								sub[parts[i]] = $$.val() !== '' ? $$.val() : true;
							}
						}
						else {
							sub[parts[i]] = $$.val();
						}
					}
					else {
						if (typeof sub[parts[i]] === 'undefined') {
							sub[parts[i]] = {};
						}
						// Go deeper into the data and continue
						sub = sub[parts[i]];
					}
				}
			});
			$el.find('input[name="widget_post_meta"]').val(JSON.stringify(data));
		}
	);
})(jQuery);