一.缘由
公司的移动端项目，采用zepto为主要框架，但是zepto毕竟是精简版的jquery，体积小了，功能自然没有这么强大，特别是动画和选择器这两块，需要我们自己去拓展。
在项目开发过程中，很多页面过渡需要用到动画，简单的show/hide过渡太生硬，对用户不友好，并且移动端大多都是采用slide效果，此文主要是为zepto拓展slide动画。
二.发现
从zepto的在线文档上可以发现一个发布在github上的动画模块，但是缺少slide效果，度娘上找了找，相关的极少，只发现了一个slideDown的例子，所以我们就照着这个例子写了几个常用的slide动画。
三.行动
首先，我们把动画方向分为上下滑动和左右滑动，滑动形式分为元素自身的伸缩和相对位移
1.左右slide
这应该是最常用的一个效果
贴上代码：注释部分二选一， slideLeft 和 slideRight 的滑动形式必须设为一致，不然无法工作
$.fn.slideRight = function (speed, callback) { //获取元素position var position = this.css('position'); this.show().css({ position: 'absolute', visibility: 'hidden' }); $('html,body').css({ overflow: 'hidden', height: '100%' }); //获取元素宽度 var width = this.width() === 0 ? $(window).width() : this.width(); //-------通过伸缩元素宽度实现动画------- //return this.css({ // top: $(window).scrollTop(), // 0, // position: position, // visibility: 'visible', // overflow: 'auto' //}).animate({ width }, speed, null, callback); //-------通过移动元素相对位置实现动画------- return this.css({ top: $(window).scrollTop(), left: -width, position: position, visibility: 'visible', overflow: 'auto', }).animate({ left: 0 }, speed, null, callback); }; $.fn.slideLeft = function (speed, callback) { //获取元素position var position = this.css('position'); this.show().css({ position: 'absolute', visibility: 'hidden' }); $('html,body').css({ overflow: '', height: '' }); //获取元素宽度 var width = this.width(); //-------通过伸缩元素宽度实现动画------- //return this.css({ // top: 0, // position: position, // visibility: 'visible', // overflow: 'auto' //}).animate({ 0 }, speed, null, callback); //-------通过移动元素相对位置实现动画------- return this.css({ top: 0, position: position, visibility: 'visible', overflow: 'auto' }).animate({ left: -width }, speed, null, callback); };
左右位移效果图：
左右伸缩效果图：
2.上下slide
贴上代码：注释部分二选一， slideUp 和 slideDown 的滑动形式必须设为一致，不然无法工作
$.fn.slideDown = function (speed, callback) { //获取元素position var position = this.css('position'); this.show().css({ position: 'absolute', visibility: 'hidden' }); $('html,body').css({ overflow: 'hidden', height: '100%' }); //获取元素高度 var height = this.height() === 0 ? $(window).height() : this.height(); //-------通过伸缩元素高度实现动画------- //return this.css({ // position: position, // visibility: 'visible', // overflow: 'auto', // height: 0 //}).animate({ height: height, top: $(window).scrollTop() }, speed, null, callback); //-------通过移动元素相对位置实现动画------- return this.css({ top: -height, left: 0, position: position, visibility: 'visible', overflow: 'auto' }).animate({ top: $(window).scrollTop() }, speed, null, callback); }; $.fn.slideUp = function (speed, callback) { //获取元素position var position = this.css('position'); this.show().css({ position: 'absolute', visibility: 'auto' }); $('html,body').css({ overflow: '', height: '' }); //获取元素高度 var height = this.height(); //-------通过伸缩元素高度实现动画------- //return this.css({ // position: position, // visibility: 'visible', // overflow: 'hidden', // height: height //}).animate({ height: 0 }, speed, null, callback); //-------通过移动元素相对位置实现动画------- return this.css({ left: 0, position: position, visibility: 'visible', overflow: 'auto' }).animate({ top: -height }, speed, null, callback); };
上下位移效果图：
上下伸缩效果图：
四.结束
这样，我们在项目中就能愉快的使用动画了。
顺便附上整个动画模块，但在这之前必须先添加上animate模块，因为zepto本身是不具有animate事件的，许多模块都是单独分出去的，可以参考这里，代码我们可以从github中的animate模块复制进去。
//animate模块 ; (function ($, undefined) { var prefix = '', eventPrefix, vendors = { Webkit: 'webkit', Moz: '', O: 'o' }, testEl = document.createElement('div'), supportedTransforms = /^((translate|rotate|scale)(X|Y|Z|3d)?|matrix(3d)?|perspective|skew(X|Y)?)$/i, transform, transitionProperty, transitionDuration, transitionTiming, transitionDelay, animationName, animationDuration, animationTiming, animationDelay, cssReset = {} function dasherize(str) { return str.replace(/([A-Z])/g, '-$1').toLowerCase() } function normalizeEvent(name) { return eventPrefix ? eventPrefix + name : name.toLowerCase() } if (testEl.style.transform === undefined) $.each(vendors, function (vendor, event) { if (testEl.style[vendor + 'TransitionProperty'] !== undefined) { prefix = '-' + vendor.toLowerCase() + '-' eventPrefix = event return false } }) transform = prefix + 'transform' cssReset[transitionProperty = prefix + 'transition-property'] = cssReset[transitionDuration = prefix + 'transition-duration'] = cssReset[transitionDelay = prefix + 'transition-delay'] = cssReset[transitionTiming = prefix + 'transition-timing-function'] = cssReset[animationName = prefix + 'animation-name'] = cssReset[animationDuration = prefix + 'animation-duration'] = cssReset[animationDelay = prefix + 'animation-delay'] = cssReset[animationTiming = prefix + 'animation-timing-function'] = '' $.fx = { off: (eventPrefix === undefined && testEl.style.transitionProperty === undefined), speeds: { _default: 400, fast: 200, slow: 600 }, cssPrefix: prefix, transitionEnd: normalizeEvent('TransitionEnd'), animationEnd: normalizeEvent('AnimationEnd') } $.fn.animate = function (properties, duration, ease, callback, delay) { if ($.isFunction(duration)) callback = duration, ease = undefined, duration = undefined if ($.isFunction(ease)) callback = ease, ease = undefined if ($.isPlainObject(duration)) ease = duration.easing, callback = duration.complete, delay = duration.delay, duration = duration.duration if (duration) duration = (typeof duration == 'number' ? duration : ($.fx.speeds[duration] || $.fx.speeds._default)) / 1000 if (delay) delay = parseFloat(delay) / 1000 return this.anim(properties, duration, ease, callback, delay) } $.fn.anim = function (properties, duration, ease, callback, delay) { var key, cssValues = {}, cssProperties, transforms = '', that = this, wrappedCallback, endEvent = $.fx.transitionEnd, fired = false if (duration === undefined) duration = $.fx.speeds._default / 1000 if (delay === undefined) delay = 0 if ($.fx.off) duration = 0 if (typeof properties == 'string') { // keyframe animation cssValues[animationName] = properties cssValues[animationDuration] = duration + 's' cssValues[animationDelay] = delay + 's' cssValues[animationTiming] = (ease || 'linear') endEvent = $.fx.animationEnd } else { cssProperties = [] // CSS transitions for (key in properties) if (supportedTransforms.test(key)) transforms += key + '(' + properties[key] + ') ' else cssValues[key] = properties[key], cssProperties.push(dasherize(key)) if (transforms) cssValues[transform] = transforms, cssProperties.push(transform) if (duration > 0 && typeof properties === 'object') { cssValues[transitionProperty] = cssProperties.join(', ') cssValues[transitionDuration] = duration + 's' cssValues[transitionDelay] = delay + 's' cssValues[transitionTiming] = (ease || 'linear') } } wrappedCallback = function (event) { if (typeof event !== 'undefined') { if (event.target !== event.currentTarget) return // makes sure the event didn't bubble from "below" $(event.target).unbind(endEvent, wrappedCallback) } else $(this).unbind(endEvent, wrappedCallback) // triggered by setTimeout fired = true $(this).css(cssReset) callback && callback.call(this) } if (duration > 0) { this.bind(endEvent, wrappedCallback) // transitionEnd is not always firing on older Android phones // so make sure it gets fired setTimeout(function () { if (fired) return wrappedCallback.call(that) }, ((duration + delay) * 1000) + 25) } // trigger page reflow so new elements can animate this.size() && this.get(0).clientLeft this.css(cssValues) if (duration <= 0) setTimeout(function () { that.each(function () { wrappedCallback.call(this) }) }, 0) return this } testEl = null })(Zepto) //动画效果模块 ; (function ($, undefined) { var document = window.document, docElem = document.documentElement, origShow = $.fn.show, origHide = $.fn.hide, origToggle = $.fn.toggle function anim(el, speed, opacity, scale, callback) { if (typeof speed == 'function' && !callback) callback = speed, speed = undefined var props = { opacity: opacity } if (scale) { props.scale = scale el.css($.fx.cssPrefix + 'transform-origin', '0 0') } return el.animate(props, speed, null, callback); } function hide(el, speed, scale, callback) { return anim(el, speed, 0, scale, function () { origHide.call($(this)) callback && callback.call(this) }) } $.fn.show = function (speed, callback) { origShow.call(this) //不是很理解作者的想法，如果这里继续执行下去，所有调用zepto原生show事件的元素，都会被这个事件覆盖，并且透明度都为被设为1... if (speed === undefined) return origShow.call(this) // 原版为：if (speed === undefined) speed = 0 else this.css('opacity', 0) return anim(this, speed, 1, '1,1', callback) } $.fn.hide = function (speed, callback) { if (speed === undefined) return origHide.call(this) else return hide(this, speed, '0,0', callback) } $.fn.toggle = function (speed, callback) { if (speed === undefined || typeof speed == 'boolean') return origToggle.call(this, speed) else return this.each(function () { var el = $(this) el[el.css('display') == 'none' ? 'show' : 'hide'](speed, callback) }) } $.fn.fadeTo = function (speed, opacity, callback) { return anim(this, speed, opacity, null, callback) } $.fn.fadeIn = function (speed, callback) { var target = this.css('opacity') if (target > 0) this.css('opacity', 0) else target = 1 return origShow.call(this).fadeTo(speed, target, callback) } $.fn.fadeOut = function (speed, callback) { return hide(this, speed, null, callback) } $.fn.fadeToggle = function (speed, callback) { return this.each(function () { var el = $(this) el[ (el.css('opacity') == 0 || el.css('display') == 'none') ? 'fadeIn' : 'fadeOut' ](speed, callback) }) } $.fn.slideDown = function (speed, callback) { //获取元素position var position = this.css('position'); this.show().css({ position: 'absolute', visibility: 'hidden' }); $('html,body').css({ overflow: 'hidden', height: '100%' }); //获取元素高度 var height = this.height() === 0 ? $(window).height() : this.height(); //-------通过伸缩元素高度实现动画------- //return this.css({ // position: position, // visibility: 'visible', // overflow: 'auto', // height: 0 //}).animate({ height: height, top: $(window).scrollTop() }, speed, null, callback); //-------通过移动元素相对位置实现动画------- return this.css({ top: -height, left: 0, position: position, visibility: 'visible', overflow: 'auto' }).animate({ top: $(window).scrollTop() }, speed, null, callback); }; $.fn.slideUp = function (speed, callback) { //获取元素position var position = this.css('position'); this.show().css({ position: 'absolute', visibility: 'auto' }); $('html,body').css({ overflow: '', height: '' }); //获取元素高度 var height = this.height(); //-------通过伸缩元素高度实现动画------- //return this.css({ // position: position, // visibility: 'visible', // overflow: 'hidden', // height: height //}).animate({ height: 0 }, speed, null, callback); //-------通过移动元素相对位置实现动画------- return this.css({ left: 0, position: position, visibility: 'visible', overflow: 'auto' }).animate({ top: -height }, speed, null, callback); }; $.fn.slideRight = function (speed, callback) { //获取元素position var position = this.css('position'); this.show().css({ position: 'absolute', visibility: 'hidden' }); $('html,body').css({ overflow: 'hidden', height: '100%' }); //获取元素宽度 var width = this.width() === 0 ? $(window).width() : this.width(); //-------通过伸缩元素宽度实现动画------- //return this.css({ // top: $(window).scrollTop(), // 0, // position: position, // visibility: 'visible', // overflow: 'auto' //}).animate({ width }, speed, null, callback); //-------通过移动元素相对位置实现动画------- return this.css({ top: $(window).scrollTop(), left: -width, position: position, visibility: 'visible', overflow: 'auto', }).animate({ left: 0 }, speed, null, callback); }; $.fn.slideLeft = function (speed, callback) { //获取元素position var position = this.css('position'); this.show().css({ position: 'absolute', visibility: 'hidden' }); $('html,body').css({ overflow: '', height: '' }); //获取元素宽度 var width = this.width(); //-------通过伸缩元素宽度实现动画------- //return this.css({ // top: 0, // position: position, // visibility: 'visible', // overflow: 'auto' //}).animate({ 0 }, speed, null, callback); //-------通过移动元素相对位置实现动画------- return this.css({ top: 0, position: position, visibility: 'visible', overflow: 'auto' }).animate({ left: -width }, speed, null, callback); }; })(Zepto)
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