好吧,我不确定我是否会以正确的方式解决这个问题,但这里有......
我正在编写一个自定义jQuery插件,为动画提供下拉菜单功能(作为学习练习,请不要“为什么不使用 superduperwonderplugin-x ”)。
我希望能够根据用户选项(即淡入淡出,滑动,拖放等)以不同方式为菜单设置动画。目前,每个不同的动画都由插件文件中的单独函数处理,但我不确定如何处理回调函数(将传递给)!
- 即动画仅发生在对象堆栈中的最后一个元素上。
这是我的代码:
/**
* Grizzly's Menuifier
*
* @author Chris.Leaper
* @version a1.0
*/
(function($){
$.fn.gmenu = function(options) {
/* Transitions:
- fade >> fadeIn / fadeOut
- slide >> slideDown / slideUp
- drop >> (different to above?)
- bounce >> (custom config transition=? and easing=bounce)
- stretch >> (custom config transition=? and easing=elastic)
- fold >> (custom) drop menu @ half width then 'fold' out to full menu width
*/
// Set the plugin default options:
var defaults = {
levels: '1',
fit: 'auto',
easing: 'linear',
transition: 'slide',
speed: 500
};
options = $.extend(defaults, options); // Merge the user options with the plugin defaults
return this.each(function() {
var $this = $(this);
var opt = options;
var container;
var ul;
// Setup the container elements (parent DIV/NAV and UL)!
if( $this.is('ul') ) container = $(this).parent();
else container = $(this);
console.log('Container: ' + container.get(0).tagName + ' id=#' + container.attr('id') + ' class=' + container.attr('class'));
ul = container.children('ul:first-child');
console.log('UL: ' + ul);
// Set the UL's position to relative:
if($(ul).css('position') != 'relative') $(ul).css('position', 'relative');
var offset;
var menus = ul.children('li:has(ul)');
console.log('List Item: ' + menus);
menus.each(function(index, menu) {
$menu = $(menu);
console.log('Menu: ' + $menu);
// Set the menu LI's position to relative (contains the absolutely positioned child UL!)
if($menu.css('position') != 'relative') $menu.css('position', 'relative');
// Get the menu LI's position relative to the document (it's offset)
// -- This is only needed when positioning non-child elements
// (i.e. ID linked menu>submenu relationships as may be used for a separated DIV based menu!!)
// offset = menu.offest();
// Position the submenu according to it's parent
var submenu = $menu.children('ul');
console.log('Submenu: ' + submenu.get(0).tagName + ' id=#' + submenu.attr('id') + ' class=' + submenu.attr('class'));
setPosition(submenu, $menu.height());
switch(opt.transition) {
case 'bounce':
setSMBounce(menu, opt);
break;
case 'fade':
setSMFade(menu, opt);
break;
case 'fold':
setSMFold(menu, opt);
break;
case 'stretch':
setSMStretch(menu, opt);
break;
case 'slide':
default:
menu = setSMSlide(menu, opt);
}
});
debug(this);
});
};
})(jQuery);
function setPosition(submenu, height) {
$(submenu).css({
left: 0,
position: 'absolute',
top: height
}).hide();
}
function setSMSlide(menu, opt) {
$menu = $(menu);
console.log('SM Slide: ' + $menu.get(0));
$menu.first('a').mouseenter(function() {
console.log('Start SlideDown');
$menu.stop(true, true).slideDown(opt.speed, opt.easing);
console.log('Stop SlideDown');
});
$menu.first('a').mouseleave(function() {
console.log('Start SlideUp');
$menu.stop(true, true).slideUp(opt.speed, opt.easing);
console.log('Stop SlideUp');
});
}
我认为我应该使用(相同的)基于命名空间的方法来定义我的单独函数(对象文字或其他东西?),但我不确定这意味着什么或如何做。
有人可以帮我吗?
答案 0 :(得分:1)
要封装你的函数 setPosition 和 setSMSlide (在你的例子中),只需在插件函数中定义它们(好的地方是在定义默认变量之后。它会看起来像那样:
var defaults = {
levels: '1',
fit: 'auto',
easing: 'linear',
transition: 'slide',
speed: 500
},
setPosition = function(submenu, height) {...},
setSMSlide = function(menu, opt) {...};
由于Javascript中的作用域的工作方式,您的setPosition和setSMSlide函数仍然可以从gmenu声明中访问。