不用递归制作滑块

Question

给定以下 jsFiddle，如何在不构建堆栈的情况下实现与我所做的相同的效果？

http://jsfiddle.net/YWMcy/1/

我尝试做这样的事情：

jQuery(document).ready(function () {
    'use strict';
    (function ($) {

        function validateOptions(options) {
            if (typeof(options.delay) == typeof(0)) {
                $.error('Delay value must an integer.');
                return false;
            } else if (options.delay < 0) {
                $.error('Delay value must be greater than zero.');
                return false;
            }

            if (typeof(options.direction) == typeof('')) {
                $.error('Direction value must be a string.');
                return false;
            } else if (!(options.direction in ['left', 'right', 'up', 'down'])) {
                $.error('Direction value must be "left", "right", "up", or "down".');
                return false;
            }

            if (typeof(options.easing) == typeof('')) {
                $.error('Easing value must be a string.');
                return false;
            }

            if (typeof(options.selector) == typeof('')) {
                $.error('Selector value must be a string.');
                return false;
            }

            if (options.transition < 0) {
                $.error('Transition value must be greater than zero.');
                return false;
            }
            return true;
        }

        var methods = {
            init:   function (options) {

                return this.each(function () {

                    var settings = {
                        delay:      5000,
                        direction:  'left',
                        easing:     'swing',
                        selector:   '*',
                        transition: 3000
                    };

                    if (options) {
                        $.extend(settings, options);
                    }

                    $(this).css({
                        overflow:   'hidden',
                        position:   'relative'
                    });

                    var styles = {
                        left:       0,
                        position:   'absolute',
                        top:        0
                    };

                    switch (settings.direction) {
                    case 'left':
                        styles.left = $(this).width() + 'px';
                        break;
                    case 'right':
                        styles.left = -$(this).width() + 'px';
                        break;
                    case 'up':
                        styles.top = $(this).height() + 'px';
                        break;
                    case 'down':
                        styles.top = -$(this).height() + 'px';
                        break;
                    default:
                        jQuery.error('Direction ' + settings.direction + ' is not valid for jQuery.fn.cycle');
                        break;
                    }

                    $(this).children(settings.selector).css(styles).first().css({
                        left:   0,
                        top:    0
                    });

                    if ($(this).children(settings.selector).length > 1) {
                        $(this).cycle('slide', settings);
                    }
                });
            },

            slide:  function (options) {
                return this.each(function () {

                    var settings = {
                        delay:      5000,
                        direction:  'left',
                        easing:     'swing',
                        selector:   '*',
                        transition: 3000
                    }, animation, property, value;

                    if (options) {
                        $.extend(settings, options);
                    }

                    switch (settings.direction) {
                    case 'left':
                        animation = {left: '-=' + $(this).width()};
                        property = 'left';
                        value = $(this).width();
                        break;
                    case 'right':
                        animation = {left: '+=' + $(this).width()};
                        property = 'left';
                        value = -$(this).width();
                        break;
                    case 'up':
                        animation = {top: '-=' + $(this).height()};
                        property = 'top';
                        value = $(this).height();
                        break;
                    case 'down':
                        animation = {top: '+=' + $(this).height()};
                        property = 'top';
                        value = -$(this).height();
                        break;
                    default:
                        jQuery.error('Direction ' + settings.direction + ' is not valid for jQuery.fn.cycle');
                        break;
                    }

                    $(this).children(settings.selector + ':first-child').each(function () {
                        $(this).delay(settings.delay);
                        $(this).animate(
                            animation,
                            settings.transition,
                            settings.easing,
                            function () {
                                $(this).css(property, value);
                            }
                        );
                    });

                    $(this).append($(this).children(settings.selector + ':first-child').detach());

                    $(this).children(settings.selector + ':first-child').each(function () {
                        $(this).delay(settings.delay);
                        $(this).animate(
                            animation,
                            settings.transition,
                            settings.easing,
                            function () {
                            $(this).parent().cycle('slide', settings);
                            }
                        );
                    });
                });
            }
        };

        jQuery.fn.cycle = function (method, options) {
            if (methods[method]) {
                return methods[method].apply(this, Array.prototype.slice.call(arguments, 1));
            } else if (typeof method === 'object' || !method) {
                return methods.init.apply(this, arguments);
            } else {
                $.error('Method ' + method + ' does not exist on jQuery.fn.cycle');
            }
        };
    }(jQuery));

    jQuery('.slider').cycle();

});

但是 < code>each() 方法不考虑循环期间添加的节点。

Answer 1

您可以通过 setInterval() 启动您的 _cycle() 函数，以定期更新滑块：

setInterval(function() {
  _cycle2(slider, transition_duration, easing);
}, delay_duration);

请注意，我重命名了您原来的 _cycle() 函数到 _cycle2()，并删除了 delay_duration 参数。您可以在此处查看工作演示。

Answer 2

你不想要类似 while(true) 的东西。

您的问题源于这样一个事实：您正在创建一个静态函数，然后尝试弄清楚如何在将其全部保留在静态函数范围内的约束下为子级设置动画。

相反，您应该为每个元素创建一个对象的实例，让该对象维护滑块的状态，并让它通过滑块操作所需的实现来更新该状态。

http://jsfiddle.net/qjVJF/3/

    (function ($) {
    var $b = $.behaviors || {};

    $b.slider = function(element, options) {
        this.element = $(element);
        this.panels = this.element.find('.slide');
        this.options = $.extend({}, $b.slider.defaults, options);

        this.currentPanel = 0;
        var horizontal = (this.options.direction == 'left' || this.options.direction == 'right');
        var anti = (this.options.direction == 'left' || this.options.direction == 'up');
        var distance  = horizontal ? '600' : '150';

        this.action = anti ? '-='+distance : '+='+distance;
        this.origin = anti ? distance : 0-distance;
        this.edge = horizontal ? 'left' : 'top';
        this.animation = horizontal ? { "left": this.action } : { "top" : this.action };

        this.panels.css(this.edge, this.origin+'px').show().first().css(this.edge, '0px');

        this.delayNext();
        return this;
    }
    $b.slider.defaults = {
        delay:      500,
        direction:  'left',
        easing:     'swing',
        transition: 3000
    };

    $b.slider.prototype = {
        delayNext: function() {
            setTimeout($.proxy(this.slideNext, this), this.options.delay);
        },
        slideNext: function() { 
            var current = this.panels[this.currentPanel % this.panels.length]; 
            var next = $(this.panels[++this.currentPanel % this.panels.length])
                .css(this.edge, this.origin+'px'); 

            var plugin = this;
            next.add(current).animate(
                this.animation,
                this.options.transition, 
                this.options.easing, 
                function() { 
                    if (this == current) plugin.delayNext();
                }
            );
        }  
    };

    $.fn.cycle = function (options) {
            return this.each(function() { 
                    $(this).data('bCycle', new $b.slider(this, options));
                });
    };
    }(jQuery));

    jQuery(document).ready(function () {
        jQuery('.slider').cycle();
    });

Answer 3

也许这个插件 http://docs.jquery.com/Plugins/livequery 可以帮助你？

Live Query 通过绑定事件或自动触发匹配元素的回调来利用 jQuery 选择器的强大功能，即使在页面加载和 DOM 更新之后也是如此。

例如，您可以使用以下代码将点击事件绑定到所有 A 标记，甚至是您可能通过 AJAX 添加的任何 A 标记。

    $('a') 
      .livequery('click', function(event) { 
        alert('clicked'); 
        return false; 
    });