导航菜单
动画特效下拉导航菜单
PetitQ
这是一款仿 stripe.com 网站的带变形动画特效的下拉导航菜单特效。该导航菜单在菜单项之间切换时，下拉菜单会根据菜单内容的大小来动态变形，效果非常有趣。
HTML 结构:
该导航菜单的 HTML 结构如下：
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<header class="cd-morph-dropdown">
<a href="#0" class="nav-trigger">Open Nav<span aria-hidden="true"></span></a>
<nav class="main-nav">
<ul>
<li class="has-dropdown gallery" data-content="about">
<a href="#0">About</a>
</li>
<li class="has-dropdown links" data-content="pricing">
<a href="#0">Pricing</a>
</li>
<li class="has-dropdown button" data-content="contact">
<a href="#0">Contact</a>
</li>
</ul>
</nav>
<div class="morph-dropdown-wrapper">
<div class="dropdown-list">
<ul>
<li id="about" class="dropdown gallery">
<!-- dropdown content here -->
</li>
<li id="pricing" class="dropdown links">
<!-- dropdown content here -->
</li>
<li id="contact" class="dropdown button">
<!-- dropdown content here -->
</li>
</ul>
<div class="bg-layer" aria-hidden="true"></div>
</div> <!-- dropdown-list -->
</div> <!-- morph-dropdown-wrapper -->
</header>
初始化插件:
为了实现这个导航菜单，特效中创建了一个 morphDropdown 对象。并使用 bindEvents ()方法来处理元素的事件。
function morphDropdown( element ) {
this.element = element;
this.mainNavigation = this.element.find('.main-nav');
this.mainNavigationItems = this.mainNavigation.find('.has-dropdown');
this.dropdownList = this.element.find('.dropdown-list');
//...this.bindEvents();
}
bindEvents()方法用于在.has-dropdown 和.dropdown 元素上检测鼠标进入和鼠标离开事件。
morphDropdown.prototype.bindEvents = function() {
var self = this;
this.mainNavigationItems.mouseenter(function(event){
//hover over one of the nav items -> show dropdownself.showDropdown($(this));
}).mouseleave(function(){
//if not hovering over a nav item or a dropdown -> hide dropdownif( self.mainNavigation.find('.has-dropdown:hover').length == 0 && self.element.find('.dropdown-list:hover').length == 0 ) self.hideDropdown();
});
//...};
showDropdown方法用于处理宽度、高度和.dropdown-list元素的translateX值，以及放大和缩小.bg-layer元素。
morphDropdown.prototype.showDropdown = function(item) {
var selectedDropdown = this.dropdownList.find('#'+item.data('content')),
selectedDropdownHeight = selectedDropdown.innerHeight(),
selectedDropdownWidth = selectedDropdown.children('.content').innerWidth(),
selectedDropdownLeft = item.offset().left + item.innerWidth()/2 - selectedDropdownWidth/2;
//update dropdown and dropdown background position and sizethis.updateDropdown(selectedDropdown, parseInt(selectedDropdownHeight), selectedDropdownWidth, parseInt(selectedDropdownLeft));
//add the .active class to the selected .dropdown and .is-dropdown-visible to the .cd-morph-dropdown//...};
morphDropdown.prototype.updateDropdown = function(dropdownItem, height, width, left) {
this.dropdownList.css({
'-moz-transform': 'translateX(' + left + 'px)',
'-webkit-transform': 'translateX(' + left + 'px)',
'-ms-transform': 'translateX(' + left + 'px)',
'-o-transform': 'translateX(' + left + 'px)',
'transform': 'translateX(' + left + 'px)',
'width': width+'px',
'height': height+'px'
});
this.dropdownBg.css({
'-moz-transform': 'scaleX(' + width + ') scaleY(' + height + ')',
'-webkit-transform': 'scaleX(' + width + ') scaleY(' + height + ')',
'-ms-transform': 'scaleX(' + width + ') scaleY(' + height + ')',
'-o-transform': 'scaleX(' + width + ') scaleY(' + height + ')',
'transform': 'scaleX(' + width + ') scaleY(' + height + ')'
});
};
| 演示地址 | 下载地址 |
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