help, modificare evento per un singolo elemento

aekold

Nuovo Utente
23 Lug 2011
1
0
0
salve a tutti, sono proprio agli inizi con javascript, e non riesco a modificare il mio codice nel modo che mi interessa.. mi spiego.. ho creato questa pagina:

http://effepicreations.altervista.org/milledelizie/index.html

sostanzialmente tramite javascript, cliccando su una voce del menù, si espande una sezione contenente del testo. Le dimensioni di questa sezione, sono specificate sia tramite css per quanto riguarda la larghezza (che mi va bene così com'è), sia tramite javascript (per quanto riguarda l'altezza, in quanto essa varia al click sulla voce del menù, passando da 0 a, in questo caso, 400 pixel).

Il mio problema è che, per alcune ragioni, vorrei modificare l'altezza della sezione solo per quanto riguarda la prima voce (cioè "Riguardo a.."), in modo tale che l'altezza della sezione che si apre al click su questa voce, sia di altezza differente rispetto all'altezza delle sezioni per le altre voci.

sapreste aiutarmi? ecco, il codice usato è questo:


Codice:
<script type="text/javascript"> 
			$(function() {
				var $ac_background	= $('#ac_background'),
				$ac_bgimage		= $ac_background.find('.ac_bgimage'),
				$ac_loading		= $ac_background.find('.ac_loading'),
				
				$ac_content		= $('#ac_content'),
				$title			= $ac_content.find('h1'),
				$menu			= $ac_content.find('.ac_menu'),
				$mainNav		= $menu.find('ul:first'),
				$menuItems		= $mainNav.children('li'),
				totalItems		= $menuItems.length,
				$ItemImages		= new Array();
				
				/* 
				for this menu, we will preload all the images. 
				let's add all the image sources to an array,
				including the bg image
				*/
				$menuItems.each(function(i) {
					$ItemImages.push($(this).children('a:first').attr('href'));
				});
				$ItemImages.push($ac_bgimage.attr('src'));
					  
				
				var Menu 			= (function(){
					var init				= function() {
						loadPage();
						initWindowEvent();
					},
					loadPage			= function() {
						/*
							1- loads the bg image and all the item images;
							2- shows the bg image;
							3- shows / slides out the menu;
							4- shows the menu items;
							5- initializes the menu items events
						 */
						$ac_loading.show();//show loading status image
						$.when(loadImages()).done(function(){
							$.when(showBGImage()).done(function(){
								//hide the loading status image
								$ac_loading.hide();
								$.when(slideOutMenu()).done(function(){
										$.when(toggleMenuItems('up')).done(function(){
										initEventsSubMenu();
									});
								});
							});
						});
					},
					showBGImage			= function() {
						return $.Deferred(
						function(dfd) {
							//adjusts the dimensions of the image to fit the screen
							adjustImageSize($ac_bgimage);
							$ac_bgimage.fadeIn(1000, dfd.resolve);
						}
					).promise();
					},
					slideOutMenu		= function() {
						/* calculate new width for the menu */
						var new_w	= $(window).width() - $title.outerWidth(true);
						return $.Deferred(
						function(dfd) {
							//slides out the menu
							$menu.stop()
							.animate({
								width	: new_w + 'px'
							}, 700, dfd.resolve);
						}
					).promise();
					},
						/* shows / hides the menu items */
						toggleMenuItems		= function(dir) {
						return $.Deferred(
						function(dfd) {
							/*
							slides in / out the items. 
							different animation time for each one.
							*/
							$menuItems.each(function(i) {
										var $el_title	= $(this).children('a:first'),
											marginTop, opacity, easing;
										if(dir === 'up'){
											marginTop	= '0px';
											opacity		= 1;
											easing		= 'easeOutBack';
										}
										else if(dir === 'down'){
											marginTop	= '60px';
											opacity		= 0;
											easing		= 'easeInBack';
						}
								$el_title.stop()
								.animate({
													marginTop	: marginTop,
													opacity		: opacity
												 }, 200 + i * 200 , easing, function(){
									if(i === totalItems - 1)
										dfd.resolve();
								});
							});
						}
					).promise();
					},
					initEventsSubMenu	= function() {
						$menuItems.each(function(i) {
							var $item		= $(this), // the <li>
							$el_title	= $item.children('a:first'),
							el_image	= $el_title.attr('href'),
							$sub_menu	= $item.find('.ac_subitem'),
							$ac_close	= $sub_menu.find('.ac_close');
							
							/* user clicks one item : appetizers | main course | desserts | wines | specials */
							$el_title.bind('click.Menu', function(e) {
									$.when(toggleMenuItems('down')).done(function(){
									openSubMenu($item, $sub_menu, el_image);
								});
								return false;
							});
							/* closes the submenu */
							$ac_close.bind('click.Menu', function(e) {
								closeSubMenu($sub_menu);
								return false;
							});
						});
					},
					openSubMenu			= function($item, $sub_menu, el_image) {
						$sub_menu.stop()
						.animate({
							height		: '400px',
							marginTop	: '0px'
						}, 400, function() {
										//the bg image changes
							showItemImage(el_image);
						});
					},
						/* changes the background image */
					showItemImage		= function(source) {
							//if its the current one return
						if($ac_bgimage.attr('src') === source)
							return false;
								
						var $itemImage = $('<img src="'+source+'" alt="Background" class="ac_bgimage"/>');
						$itemImage.insertBefore($ac_bgimage);
						adjustImageSize($itemImage);
						$ac_bgimage.fadeOut(1500, function() {
							$(this).remove();
							$ac_bgimage = $itemImage;
						});
						$itemImage.fadeIn(1500);
					},
					closeSubMenu		= function($sub_menu) {
						$sub_menu.stop()
						.animate({
							height		: '0px',
							marginTop	: '0px'
						}, 400, function() {
							//show items
										toggleMenuItems('up');
						});
					},
						/*
						on window resize, ajust the bg image dimentions,
						and recalculate the menus width
						*/
					initWindowEvent		= function() {
						/* on window resize set the width for the menu */
						$(window).bind('resize.Menu' , function(e) {
							adjustImageSize($ac_bgimage);
							/* calculate new width for the menu */
							var new_w	= $(window).width() - $title.outerWidth(true);
							$menu.css('width', new_w + 'px');
						});
					},
						/* makes an image "fullscreen" and centered */
					adjustImageSize		= function($img) {
						var w_w	= $(window).width(),
						w_h	= $(window).height(),
						r_w	= w_h / w_w,
						i_w	= $img.width(),
						i_h	= $img.height(),
						r_i	= i_h / i_w,
						new_w,new_h,
						new_left,new_top;
							
						if(r_w > r_i){
							new_h	= w_h;
							new_w	= w_h / r_i;
						}
						else{
							new_h	= w_w * r_i;
							new_w	= w_w;
						}
							
						$img.css({
							width	: new_w + 'px',
							height	: new_h + 'px',
							left	: (w_w - new_w) / 2 + 'px',
							top		: (w_h - new_h) / 2 + 'px'
						});
					},
						/* preloads a set of images */
					loadImages			= function() {
						return $.Deferred(
						function(dfd) {
							var total_images 	= $ItemImages.length,
							loaded			= 0;
							for(var i = 0; i < total_images; ++i){
								$('<img/>').load(function() {
									++loaded;
									if(loaded === total_images)
										dfd.resolve();
								}).attr('src' , $ItemImages[i]);
							}
						}
					).promise();
					};
						
					return {
						init : init
					};
				})();
			
				/*
			call the init method of Menu
				 */
				Menu.init();
			});
		</script>