移动web：翻页场景动画

　　在移动web，特别是在微信中，经常看到一种翻页动画效果，也称为场景动画。

　　一页一页的翻过，像在看书，每页的内容以各种"炫酷"的效果出现在你的眼里，配上一首动听的音乐，你有没有喜欢上呢。

　　这里没有音乐，没有炫酷的出场，只有实实在在的翻页。

　　先看看效果（如果不能查看 复制下面的代码保存在本地查看 或者在移动设备查看本页面）

 　　先贴上代码，仅供参考

/**
 * LBS slidePage 绝对定位方式 支持WP
 * Date: 2014-11-20
 * ===================================================
 * opts.el 外围包裹容器/滑动事件对象(一个字符串的CSS选择器或者元素对象)
 * opts.index 索引(默认0) 指定显示哪个索引的页
 * opts.current    当前页添加的类名(默认'current')
 * opts.navShow 是否需要导航指示 默认false不需要 
 * opts.navClass 导航指示容器的类名 方便设置样式 (默认'slide-nav') 
 * opts.auto 是否自动播放 默认false
 * opts.delay 自动播放间隔时间 默认5000(单位毫秒) 自动播放时有效
 * opts.locked 是否锁定头尾滑动  默认false 如果开启则不能使用自动播放
 * opts.effect 动画效果(平移=translate 缩放=scale 重叠=overlap) 默认平移
 * opts.duration 动画持续时间 默认300(单位毫秒) 
 * opts.minScale 动画效果为缩放时的最小缩放比率(0 ~ 1) 1为没有缩放效果 默认0.5
 * opts.start 手指按下时 执行函数
 * opts.move 手指移动中 执行函数
 * opts.end 手指收起后 执行函数
 * ===================================================
 * this.box 包裹页的容器对象
 * this.index 当前索引
 * this.length 有多少页 最后一页的索引为 this.length-1
 * this.play 调用自动播放的方法 
 * this.stop 清除自动播放的方法
 * this.up 手动调用向上滑动翻页的方法 方便增加点击按钮时调用
 * this.down 手动调用向下滑动翻页的方法
 * ===================================================
 **/
;(function() {
    window.slidePage = function(opts) {
        opts = opts || {};
        if (opts.el === undefined) return;
        this.box = typeof opts.el === 'string' ? document.querySelector(opts.el) : opts.el;
        this.pages = this.box.children;
        this.length = this.pages.length;
        if (this.length < 1) return;
        if (opts.index > this.length - 1) opts.index = 0;

        this.body = document.getElementsByTagName('body')[0];
        this.nav = null;
        this.navs = [];
        this.navShow = !!opts.navShow || false;
        this.navClass = opts.navClass || 'slide-nav';

        this.index = this.oIndex = opts.index || 0;
        this.current = opts.current || 'current';
        this.locked = !!opts.locked || false;
        this.auto = !!opts.auto || false;
        this.auto && (this.delay = opts.delay || 5000);
        this.effect = opts.effect || 'translate';
        this.duration = opts.duration || 300;
        this.minScale = opts.minScale || 0.5;

        this.start = opts.start || function() {};
        this.move = opts.move || function() {};
        this.end = opts.end || function() {};

        this.timer = null;
        this.animated = true;
        this.touch = {};
        this.point = '';

        this.init();
    };
    slidePage.prototype = {
        init: function() {
            this.navShow && this.createNav();
            this.initSet();
            this.bind();
        },
        createNav: function() {
            var li = null,
                i = 0;
            this.nav = document.createElement('ul');
            for (; i < this.length; i++) {
                li = document.createElement('li');
                this.navs.push(li);
                this.nav.appendChild(li);
            }
            this.nav.className = this.navClass;
            this.body.appendChild(this.nav);
        },
        initSet: function() {
            this.height = document.documentElement.clientHeight || document.body.clientHeight;
            if (this.css(this.box, 'position') !== 'absolute' || this.css(this.box, 'position') !== 'relative') this.box.style.position = 'relative';
            if (this.css(this.box, 'overflow') !== 'hidden') this.box.style.overflow = 'hidden';
            this.box.style.height = this.height + 'px';
            for (var i = 0; i < this.length; i++) {
                if (this.css(this.pages[i], 'display') !== 'none') this.pages[i].style.display = 'none';
                if (this.css(this.pages[i], 'position') !== 'absolute') this.pages[i].style.position = 'absolute';
                this.pages[i].style.height = this.height + 'px';
            }
            if (this.navShow) {
                this.nav.style.marginTop = -this.nav.offsetHeight / 2 + 'px';
                this.navs[this.index].className = this.current;
            }
            this.pages[this.index].className += ' ' + this.current;
            this.zIndex = parseInt(this.css(this.pages[this.index], 'zIndex') === 'auto' ? 1 : this.css(this.pages[this.index], zIndex)) + 10;
            this.pages[this.index].style.display = 'block';
        },
        bind: function() {
            var _this = this;
            this.on(this.box, ['touchstart', 'pointerdown', 'mousedown'], function(e) {
                _this.touchStart(e);
                _this.auto && _this.stop();
            });
            this.on(this.box, ['touchmove', 'pointermove', 'mousemove'], function(e) {
                _this.touchMove(e);
                _this.auto && _this.stop();
            });
            this.on(this.box, ['touchend', 'touchcancel', 'pointerup', 'mouseup'], function(e) {
                _this.touchEnd(e);
                _this.auto && _this.play();
            });
        },
        touchStart: function(e) {
            this.point = e.type.indexOf('down') < 0 ? 'touch' : 'pointer';
            if (this.point === 'pointer') {
                this.touch.x = e.pageX;
                this.touch.y = e.pageY;
            }else if (this.point === 'touch') {
                this.touch.x = e.touches[0].pageX;
                this.touch.y = e.touches[0].pageY;
            }
            this.touch.disX = 0;
            this.touch.disY = 0;
            this.touch.fixed = '';
            this.start && this.start();
        },
        touchMove: function(e) {
            e.stopPropagation();
            e.preventDefault();
            if (this.point === '') return;
            if (this.touch.fixed === 'left') return;
            if (!this.animated) return;
            if (this.point === 'pointer') {
                this.touch.disX = e.pageX - this.touch.x;
                this.touch.disY = e.pageY - this.touch.y;
            }else if (this.point === 'touch') {
                if (e.touches.length > 1) return;
                this.touch.disX = e.touches[0].pageX - this.touch.x;
                this.touch.disY = e.touches[0].pageY - this.touch.y;
            }
            if (this.touch.fixed === '') {
                if (Math.abs(this.touch.disY) > Math.abs(this.touch.disX)) {
                    this.touch.fixed = 'up';
                } else {
                    this.touch.fixed = 'left';
                }
            }
            if (this.touch.fixed === 'up') {
                if (this.effect === 'scale') {
                    this.scale = ((this.height - Math.abs(this.touch.disY)) / this.height).toFixed(3);
                    this.scale < this.minScale && (this.scale = this.minScale);
                }
                if (this.touch.disY > 0) {
                    if (this.locked && this.oIndex === 0) return;
                    this.dis = -this.height;
                    this.index = this.oIndex - 1;
                    this.index < 0 && (this.index = this.length - 1);
                    if (this.effect === 'scale') this.setOrigin(this.oIndex, 'center bottom');
                } else {
                    if (this.locked && this.oIndex === this.length - 1) return;
                    this.dis = this.height;
                    this.index = this.oIndex + 1;
                    this.index > this.length - 1 && (this.index = 0);
                    if (this.effect === 'scale') this.setOrigin(this.oIndex, 'center top');
                }

                if (this.nIndex !== undefined && this.nIndex !== this.index && this.nIndex !== this.oIndex) {
                    this.pages[this.nIndex].style.display = 'none';
                    this.pages[this.nIndex].style.zIndex = '';
                    this.pages[this.nIndex].style.webkitTransform = this.pages[this.nIndex].style.transform = '';
                }
                this.nIndex = this.index;

                this.pages[this.oIndex].style.zIndex = this.zIndex;
                this.pages[this.index].style.zIndex = this.zIndex + 10;
                this.setTransform(this.index, this.dis);
                this.pages[this.index].style.display = 'block';

                this.setTransform(this.index, this.touch.disY + this.dis);
                if (this.effect === 'translate') this.setTransform(this.oIndex, this.touch.disY);
                if (this.effect === 'scale') this.setScale(this.oIndex, this.scale);

                this.move && this.move();
            }
        },
        touchEnd: function(e) {
            this.point = '';
            if (this.index === this.oIndex) return;
            if (this.touch.fixed === 'up') {
                var Y = Math.abs(this.touch.disY);
                if ((this.animated && Y > 10) || Y > this.height / 2) {
                    this.slide();
                } else {
                    this.goback();
                }
                this.end && this.end();
            }
        },
        css: function(o, n) {
            return getComputedStyle(o, null)[n];
        },
        on: function(el, types, handler) {
            for (var i = 0, l = types.length; i < l; i++) el.addEventListener(types[i], handler, false);
        },
        setScale: function(index, v) {
            this.setStyle(this.pages[index], 'transform', 'scale(' + v + ')');
        },
        setOrigin: function(index, dir) {
            this.setStyle(this.pages[index], 'transform-origin', dir);
        },
        setTransform: function(index, v) {
            this.setStyle(this.pages[index], 'transform', 'translate3d(0,' + v + 'px,0)');
        },
        setTransition: function(index, v) {
            this.setStyle(this.pages[index], 'transition', 'all ' + v + 'ms');
        },
        setStyle: function(el, p, v) {
            var prefix = ['o', 'moz', 'ms', 'webkit', ''],
                i = 0,
                l = prefix.length;
            for (; i < l; i++) {
                (function(i) {
                    var s = prefix[i] + '-' + p;
                    s = s.replace(/-\D/g, function(match) {
                        return match.charAt(1).toUpperCase();
                    });
                    el.style[s] = v;
                }(i));
            }
        },
        slide: function() {
            var _this = this;
            this.animated = false;
            this.setTransition(this.index, this.duration);
            this.setTransition(this.oIndex, this.duration);
            this.setTransform(this.index, 0);
            if (this.effect === 'translate') this.setTransform(this.oIndex, -this.dis);
            if (this.effect === 'scale') this.setScale(this.oIndex, this.minScale);
            setTimeout(function() {
                if (_this.index !== _this.oIndex) _this.update();
                _this.animated = true;
            }, this.duration);
        },
        goback: function() {
            var _this = this;
            this.setTransition(this.index, 100);
            this.setTransition(this.oIndex, 100);
            this.setTransform(this.index, this.dis);
            if (this.effect === 'translate') this.setTransform(this.oIndex, 0);
            if (this.effect === 'scale') this.setScale(this.oIndex, 1);
            setTimeout(function() {
                _this.clear();
                _this.pages[_this.index].style.display = 'none';
                _this.index = _this.oIndex;
            }, 100);
        },
        update: function() {
            if (this.navShow) {
                this.navs[this.index].className = this.current;
                this.navs[this.oIndex].className = '';
            }
            this.pages[this.oIndex].style.display = 'none';
            this.pages[this.index].className += ' ' + this.current;
            this.pages[this.oIndex].className = this.pages[this.oIndex].className.replace(this.current, '').trim();
            this.clear();
            this.oIndex = this.index;
        },
        clear: function() {
            this.pages[this.index].style.webkitTransition = this.pages[this.index].transition = '';
            this.pages[this.oIndex].style.webkitTransition = this.pages[this.oIndex].transition = '';
            this.pages[this.index].style.webkitTransform = this.pages[this.index].style.transform = '';
            this.pages[this.oIndex].style.webkitTransform = this.pages[this.oIndex].style.transform = '';
            this.pages[this.oIndex].style.zIndex = '';
            this.pages[this.index].style.zIndex = '';
            if (this.effect === 'scale') this.setOrigin(this.oIndex, '');
        },
        animate: function() {
            var _this = this;
            this.setTransform(this.index, this.dis);
            this.pages[this.index].style.display = 'block';
            this.pages[this.oIndex].style.zIndex = this.zIndex;
            this.pages[this.index].style.zIndex = this.zIndex + 10;
            this.setTransition(this.index, 0);
            this.setTransition(this.oIndex, 0);
            setTimeout(function() {
                _this.slide();
            }, 50);
        },
        up: function() {
            this.dis = this.height;
            this.index++;
            this.index > this.length - 1 && (this.index = 0);
            if (this.effect === 'scale') this.setOrigin(this.oIndex, 'center top');
            this.animate();
        },
        down: function() {
            this.dis = -this.height;
            this.index--;
            this.index < 0 && (this.index = this.length - 1);
            if (this.effect === 'scale') this.setOrigin(this.oIndex, 'center bottom');
            this.animate();
        },
        play: function() {
            var _this = this;
            if (this.locked) return;
            this.timer = setInterval(function() {
                _this.up();
            }, this.delay);
        },
        stop: function() {
            this.timer && clearInterval(this.timer);
            this.timer = null;
        }
    };
}());
查看完整代码

　　和以前写的 图片切换 有许多共同的地方，整个翻页和图片切换原理都是类似的。

　　这个支持自动播放，三种翻页效果，限制头尾滑动等。

　　翻页动画，就是在一个容器内滑动，在这个容器中每次只显示一页，每一页都有一些css3动画效果的元素出现。

　　一个简单的HTML结构如下：

<div id="slidePageBox" class="slide-box">
    <section class="slide-page page1">
         <!-- 1 -->
    </section>
    <section class="slide-page page2">
        <!-- 2 -->
    </section>
    <section class="slide-page page3">
        <!-- 3 -->
    </section>
    <section class="slide-page page4">
        <!-- 4 -->
    </section>
    <section class="slide-page page5">
        <!-- 5 -->
    </section>
</div>

　　类名为slide-box的div标签就是容器，类名为slide-page的section标签就是每个要翻的页。

this.box = typeof opts.el === 'string' ? document.querySelector(opts.el) : opts.el;
this.pages = this.box.children;
this.length = this.pages.length;

　　这里this.box就是容器，this.pages就是所有要翻的页。

this.height = document.documentElement.clientHeight;
this.box.style.height = this.height + 'px';
for (var i = 0; i < this.length; i++) {
    //..
    this.pages[i].style.height = this.height + 'px';
}

　　获取浏览器窗口的高，并设置容器和页的高为这个值。这个翻页是上下滑动，JS就没有获取宽度值了。

　　容器宽用css设置为width:100%，做个最大宽度限制为max-width:640px，这可根据实际情况设置。

 

 　  现在切换翻页，当手指在容器滑动时，这里为判断上下滑动，满足滑动一定距离，手指离开容器时，开始翻页。

　　触摸事件：手指移入，手指移动，手指离开

　　指针事件：指针按下，指针移动，指针收起

　　鼠标事件: 鼠标按下，鼠标移动，鼠标收起

//..
bind: function() {
    var _this = this;
    this.on(this.box, ['touchstart', 'pointerdown', 'mousedown'], function(e) {
        _this.touchStart(e); 
        //..
    });
    this.on(this.box, ['touchmove', 'pointermove', 'mousemove'], function(e) {
        _this.touchMove(e);
        //..
    });
    this.on(this.box, ['touchend', 'touchcancel', 'pointerup', 'mouseup'], function(e) {
        _this.touchEnd(e);
        //..
    });
},
//..

　　绑定了触摸事件，WP的指针事件，鼠标事件。

//..
touchStart: function(e) {
    this.point = e.type.indexOf('down') < 0 ? 'touch' : 'pointer';
    if (this.point === 'pointer') {
        this.touch.x = e.pageX;
        this.touch.y = e.pageY;
    }else if (this.point === 'touch') {
        this.touch.x = e.touches[0].pageX;
        this.touch.y = e.touches[0].pageY;
    }
    //..
},
//..

　　获取移入时的初始位置（触摸，指针，鼠标）

//..
touchMove: function(e) {
    //..
    if (this.touch.fixed === 'left') return;
    //..
    if (this.point === 'pointer') {
        this.touch.disX = e.pageX - this.touch.x;
        this.touch.disY = e.pageY - this.touch.y;
    }else if (this.point === 'touch') {
        //..
        this.touch.disX = e.touches[0].pageX - this.touch.x;
        this.touch.disY = e.touches[0].pageY - this.touch.y;
    }
    if (this.touch.fixed === '') {
        if (Math.abs(this.touch.disY) > Math.abs(this.touch.disX)) {
            this.touch.fixed = 'up';
        } else {
            this.touch.fixed = 'left';
        }
    }
    if (this.touch.fixed === 'up') {
        //..
    }
},
//..

　　移动时（触摸，指针，鼠标）获取移动了多少距离，根据距离判断向左右还是上下移动的，这里翻页只要上下移动。

//..
if (this.touch.fixed === 'up') {
    if (this.effect === 'scale') {
        this.scale = ((this.height - Math.abs(this.touch.disY)) / this.height).toFixed(3);
        this.scale < this.minScale && (this.scale = this.minScale);
    }
    if (this.touch.disY > 0) {
        if (this.locked && this.oIndex === 0) return;
        this.dis = -this.height;
        this.index = this.oIndex - 1;
        this.index < 0 && (this.index = this.length - 1);
        if (this.effect === 'scale') this.setOrigin(this.oIndex, 'center bottom');
    } else {
        if (this.locked && this.oIndex === this.length - 1) return;
        this.dis = this.height;
        this.index = this.oIndex + 1;
        this.index > this.length - 1 && (this.index = 0);
        if (this.effect === 'scale') this.setOrigin(this.oIndex, 'center top');
    }

    if (this.nIndex !== undefined && this.nIndex !== this.index && this.nIndex !== this.oIndex) {
        this.pages[this.nIndex].style.display = 'none';
        this.pages[this.nIndex].style.zIndex = '';
        this.pages[this.nIndex].style.webkitTransform = this.pages[this.nIndex].style.transform = '';
    }
    this.nIndex = this.index;

    this.pages[this.oIndex].style.zIndex = this.zIndex;
    this.pages[this.index].style.zIndex = this.zIndex + 10;
    this.setTransform(this.index, this.dis);
    this.pages[this.index].style.display = 'block';

    this.setTransform(this.index, this.touch.disY + this.dis);
    if (this.effect === 'translate') this.setTransform(this.oIndex, this.touch.disY);
    if (this.effect === 'scale') this.setScale(this.oIndex, this.scale);

    this.move && this.move();
}
//..
移动中

　　移动中做了很多事情，是整个程序比较重要的部分。在上下移动时，当前显示的页跟着移动，向上移动时，下一页显示出来一部分，向下移动时，上一页显示一部分。

　　如果锁定了头尾，第一页向下移动时不能移动，同样最后一页向上移动时不能移动。

opts.effect 动画效果(平移=translate 缩放=scale 重叠=overlap) 默认平移

　　根据每种翻页效果做初始化设置(如果只需要简单的平移切换可以省去很多代码)。

//..
touchEnd: function(e) {
    this.point = '';
    if (this.index === this.oIndex) return;
    if (this.touch.fixed === 'up') {
        var Y = Math.abs(this.touch.disY);
        if ((this.animated && Y > 10) || Y > this.height / 2) {
            this.slide();
        } else {
            this.goback();
        }
       //..
    }
},
//..

　　离开时（触摸，指针，鼠标）根据条件执行滑动切换。

//..
slide: function() {
    var _this = this;
    this.animated = false;
    this.setTransition(this.index, this.duration);
    this.setTransition(this.oIndex, this.duration);
    this.setTransform(this.index, 0);
    if (this.effect === 'translate') this.setTransform(this.oIndex, -this.dis);
    if (this.effect === 'scale') this.setScale(this.oIndex, this.minScale);
    setTimeout(function() {
        if (_this.index !== _this.oIndex) _this.update();
        _this.animated = true;
    }, this.duration);
},
//..

　　滑动切换完成时会更新一些设置，比如为当前页增加当前标志类名。每页的css3动画元素也就可以根据这个类名执行动画效果。

//..
update: function() {
    if (this.navShow) {
        this.navs[this.index].className = this.current;
        this.navs[this.oIndex].className = '';
    }
    this.pages[this.oIndex].style.display = 'none';
    this.pages[this.index].className += ' ' + this.current;
    this.pages[this.oIndex].className = this.pages[this.oIndex].className.replace(this.current, '').trim();
    this.clear();
    this.oIndex = this.index;
},
//..

　　切换了页，执行了每页的动画，整个场景动画就差不多完成了。

 　  最后就是一些简单的了，自动播放什么的。

　　好了，到此结束。

　  ---------------- 补充 ------------------------

　  为了兼容各大浏览器，css3动画属性前缀值得注意。

//..
setStyle: function(el, p, v) {
    !this.cache[el] && (this.cache[el] = {});
    !this.cache[el][p] && (this.cache[el][p] = this.prefix(p));
    el.style[this.cache[el][p] || this.prefix(p)] = v;
},
prefix: function(p) {
    var style = document.createElement('div').style;
    if (p in style) return p;
    var prefix = ['webkit', 'Moz', 'ms', 'O'],
        i = 0,
        l = prefix.length,
        s = '';
    for (; i < l; i++) {
        s = prefix[i] + '-' + p;
        s = s.replace(/-\D/g, function(match) {
            return match.charAt(1).toUpperCase();
        });
        if (s in style) return s;
    }
},
//..

　 这里做了PC端查看兼容，注意IE的pointer移动事件会有个很有意思的表现，移动端的程序还是在移动设备中查看比较好。

　

posted @ 2016-01-08 11:49  eyeear  阅读(3107)  评论(4)  编辑  收藏  举报