/**
 * JS-Fallback for some new HTML5 features
 * - placeholder (by Mark)
 * - details (by Mathias)
 *
 * Requires:
 * - jquery1.6 (maybe less)
 * - jquery.livequery to work with ajax content
 *
 * @author Mark Scherer
 * @licence MIT
 * 2011-11-29 ms
 */
(function() {

/* placeholder */
	var input = document.createElement('input');

	if(!('placeholder' in input)) {
		$('input[placeholder], textarea[placeholder]').livequery(function() {

			var obj = $(this);

			var setPlaceholder = function() {
				if (!obj.val() || obj.val() == obj.attr('placeholder')) {
					obj.val(obj.attr('placeholder')).addClass('pseudoPlaceholder').data('fallbackPlaceholder', true);
				}
			}
			setPlaceholder();
			var unsetPlaceholder = function() {
				obj.val('').removeClass('pseudoPlaceholder').data('fallbackPlaceholder', false);
			}

			obj.blur(function() {
				if(!obj.val().length) {
					setPlaceholder();
				}
			});

			obj.focus(function() {
				if(obj.data('fallbackPlaceholder')) {
					unsetPlaceholder();
				}
			});
		});
		$('form').live('submit', function() {
			$(this).find(".pseudoPlaceholder").each(function() {
				var obj = $(this);
				obj.removeClass('pseudoPlaceholder');
				if (!obj.val() || obj.val() == obj.attr('placeholder')) {
					obj.val('');
				};
			});
		});
	}

	if(!('autofocus' in input)) {
		$('input[autofocus], textarea[placeholder]').livequery(function() {
			$(this).focus();
		});
	}

/* details - http://mathiasbynens.be/notes/html5-details-jquery */

	var isDetailsSupported = (function(doc) {
	 var el = doc.createElement('details'),
		 de = doc.documentElement,
		 fake,
		 root = doc.body || (function() {
			fake = true;
			return de.insertBefore(doc.createElement('body'), de.firstChildElement || de.firstChild);
		 }()),
		 diff;
	 el.innerHTML = '<summary>a</summary>b';
	 el.style.display = 'block';
	 root.appendChild(el);
	 diff = el.offsetHeight;
	 el.open = true;
	 diff = diff != el.offsetHeight;
	 root.removeChild(el);
	 if (fake) {
		root.parentNode.removeChild(root);
	 }
	 return diff;
	}(document));

	// Execute the fallback only if there’s no native `details` support
	if (!isDetailsSupported) {

	 document.documentElement.className += ' no-details';

	 // Loop through all `details` elements
	 $('details').each(function() {

		// Store a reference to the current `details` element in a variable
		var $details = $(this),
			// Store a reference to the `summary` element of the current `details` element (if any) in a variable
			$detailsSummary = $('summary', $details),
			// Do the same for the info within the `details` element
			$detailsNotSummary = $details.children(':not(summary)'),
			// This will be used later to look for direct child text nodes
			$detailsNotSummaryContents = $details.contents(':not(summary)'),
			// This will be used later on
			open;

		// If there is no `summary` in the current `details` element…
		if (!$detailsSummary.length) {
		 // …create one with default text
		 $detailsSummary = $(document.createElement('summary')).text('Details').prependTo($details);
		}

		// Look for direct child text nodes
		if ($detailsNotSummary.length !== $detailsNotSummaryContents.length) {
		 // Wrap child text nodes in a `span` element
		 $detailsNotSummaryContents.filter(function() {
		// Only keep the node in the collection if it’s a text node containing more than only whitespace
		return (this.nodeType === 3) && (/[^\t\n\r ]/.test(this.data));
		 }).wrap('<span>');
		 // There are now no direct child text nodes anymore — they’re wrapped in `span` elements
		 $detailsNotSummary = $details.children(':not(summary)');
		}

		// Hide content unless there’s an `open` attribute
		// Chrome 10 already recognizes the `open` attribute as a boolean (even though it doesn’t support rendering `<details>` yet
		// Other browsers without `<details>` support treat it as a string
		/* fix - 2011-05-13 ms */
		open = $details.get()[0].getAttribute('open');
		if (typeof open == 'string' || (typeof open == 'boolean' && open)) {
		 $details.addClass('open');
		 $detailsNotSummary.show();
		} else {
		 $detailsNotSummary.hide();
		}

		// Set the `tabindex` attribute of the `summary` element to 0 to make it keyboard accessible
		$detailsSummary.attr('tabindex', 0).click(function() {
		 // Focus on the `summary` element
		 $detailsSummary.focus();
		 // Toggle the `open` attribute of the `details` element
		 typeof $details.attr('open') !== 'undefined' ? $details.removeAttr('open') : $details.attr('open', 'open');
		 // Toggle the additional information in the `details` element
		 $detailsNotSummary.toggle(0);
		 $details.toggleClass('open');
		}).keyup(function(event) {
		 if (13 === event.keyCode || 32 === event.keyCode) {
		// Enter or Space is pressed — trigger the `click` event on the `summary` element
		// Opera already seems to trigger the `click` event when Enter is pressed
		if (!($.browser.opera && 13 === event.keyCode)) {
		 event.preventDefault();
		 $detailsSummary.click();
		}
		 }
		});

	 });

	}

	if(!('list' in input)) {
		$('input[list]').livequery(function() {
			$(this).datalist();
		});
	}

})();