function scrollToTop() {
	var $root = $('html, body');
	$root.animate({
		scrollTop: 0
	}, 500);
}

var enableLeaveWarning = false;
$(function() {
	// bootstrap
	$.fn.typeahead.Constructor.prototype.customLookup = function (event) {
		var items

		this.query = this.$element.val()

		if (this.query.length < this.options.minLength) {
		  return this.shown ? this.hide() : this
		}

		items = $.isFunction(this.source) ? this.source(this.query, $.proxy(this.process, this)) : this.source

		return items ? this.process(items) : this
	};
	
	// Leave confirm
	$('input, textarea, select').change(function() {
		var $this = $(this),
			readonly = $this.prop('readonly'),
			disabled = $this.prop('disabled');
		if (!readonly && !disabled) {
			// ignore search form
			var $form = $this.closest('form');
			if ($form.length) {
				var id = $form.attr('id');
				if (id != 'search_form') {
					enableLeaveWarning = true;
				}
			}
		}
	});
	$(window).bind('beforeunload', function(e) {
		if (enableLeaveWarning) {
			return '★ Data still NOT SAVED, are you want to leave this page? ★';
		}
	});
	var checkedSubmit = false,
		checkedSubmitLastEnableLeaveWarning = false;
	$(':submit').click(function() {
		checkedSubmit = true;
		checkedSubmitLastEnableLeaveWarning = enableLeaveWarning;
		enableLeaveWarning = false;
	});
	
	// validator
	$.validator.setDefaults({
		errorClass: 'text-error',
		invalidHandler: function(event, validator) {
			var errors = validator.numberOfInvalids();
			if (errors) {
				if (checkedSubmit) {
					enableLeaveWarning = checkedSubmitLastEnableLeaveWarning;
					checkedSubmit = false;
				}
				
				validator.showErrors(); // show errors before fix IE placeholder position
				if ($.browser.msie) {
					$(window).resize(); // fix IE placeholder position
				}
			}
		}
	});
	// select2
	$.fn.select2.defaults = $.extend({}, $.fn.select2.defaults, {
		minimumInputLength: 0,
		allowClear: true,
		placeholder: 'Please Select...'
	});
	
	$(document).on('blur', 'input[type=text], input[type=textarea]', function() {
		if ($.browser.msie) {
			$(window).resize(); // fix IE placeholder position
		}
	});
});