自定义jquery插件中的多个函数和回调?

时间:2011-09-01 16:45:41

标签: javascript jquery jquery-plugins callback

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?

1 个答案:

答案 0 :(得分:1)

要封装你的函数 setPosition 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。