jquery结合iscroll.js做下拉刷新页面，上拉加载页面
先上代码，里面都有注释这就不一一说明了
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>上拉加载</title> <meta name="viewport" content="width=device-width,initial-scale=1.0,minimum-scale=1.0,maximum-scale=1.0,user-scalable=no"/> <script src="js/jquery-1.11.3.min.js"></script> <style type="text/css"> * { margin: 0; padding: 0; list-style: none; box-sizing: border-box; -webkit-box-sizing: border-box; -moz-box-sizing: border-box; } html {font-size: 14px; } header { height: 40px; width: 100%; min-width: 320px; background: #000; text-align: center; color: #fff; font-size: 1.2rem; line-height: 40px; } footer { height: 52px; width: 100%; min-width: 320px; background: #000; text-align: center; color: #fff; font-size: 1.2rem; line-height: 52px; position: absolute; bottom: 0; } #wrapper { width: 100%; min-width: 320px; position: absolute; left: 0; top: 40px; bottom: 52px; overflow: hidden; z-index: 1; background-color: #eee; /* 防止本机Windows上的触摸事件 */ -ms-touch-action: none; /* 防止callout tap-hold和文本的选择 */ -webkit-touch-callout: none; -webkit-user-select: none; -moz-user-select: none; -ms-user-select: none; user-select: none; /* 防止文本调整取向变化对web应用程序很有用 */ -webkit-text-size-adjust: none; -moz-text-size-adjust: none; -ms-text-size-adjust: none; -o-text-size-adjust: none; text-size-adjust: none; } .pull-loading { text-align: center; height: 40px; line-height: 40px; display: flex; align-items: center; justify-content: center; } #scroller ul li { padding: 20px 10px; border-bottom: solid 1px #ccc; background: #fff; } </style> </head> <body> <header>上拉加载，下拉刷新</header> <div id="wrapper"> <div id="scroller"> <ul> </ul> <div class="pull-loading"> 上拉加载 </div> </div> </div> <footer>底部</footer> <script type="text/javascript" src="js/iscroll.js"></script> <script type="text/javascript"> var myscroll = new iScroll("wrapper", { onScrollMove: function () { //拉动时 //上拉加载 if (this.y < this.maxScrollY) { $(".pull-loading").html("释放加载"); $(".pull-loading").addClass("loading"); } else { $(".pull-loading").html("上拉加载"); $(".pull-loading").removeClass("loading"); } }, onScrollEnd: function () { //拉动结束时 //上拉加载 if ($(".pull-loading").hasClass('loading')) { $(".pull-loading").html("加载中..."); pullOnLoad(); } } }); //上拉加载函数,ajax var num = 0; var page = 3; //每次加载3条 //初始化先加载三条数据 pullOnLoad(); function pullOnLoad() { setTimeout(function () { $.ajax({ url: "http://spider.dcloud.net.cn/api/news", type: "get", dataType: 'json', success: function (data) { var data_length = data.length;//数据的总长度 var remainder = data_length % page;//余数 if ( data_length >= (num+page)){ for (var j = num; j < num + page; j++){ var text = data[j].title; $("#scroller ul").append("<li>"+ text +"</li>"); } num+=page; }else if (remainder != 0 && data_length-num == remainder){ for (var j = num; j < num + remainder; j++){ var text = data[j].title; $("#scroller ul").append("<li>"+ text +"</li>"); } num+=page; }else{ $('.pull-loading').html("没有了哟"); } myscroll.refresh(); }, error: function () { console.log("出错了"); } }); myscroll.refresh(); }, 500); } </script> </body> </html>
iscroll.js的代码
/** * Created by Administrator on 2018/11/14. */ /*! * iScroll v4.2.5 ~ Copyright (c) 2012 Matteo Spinelli, http://cubiq.org * Released under MIT license, http://cubiq.org/license */ (function(window, doc){ var m = Math, dummyStyle = doc.createElement('div').style, vendor = (function () { var vendors = 't,webkitT,MozT,msT,OT'.split(','), t, i = 0, l = vendors.length; for ( ; i < l; i++ ) { t = vendors[i] + 'ransform'; if ( t in dummyStyle ) { return vendors[i].substr(0, vendors[i].length - 1); } } return false; })(), cssVendor = vendor ? '-' + vendor.toLowerCase() + '-' : '', // Style properties transform = prefixStyle('transform'), transitionProperty = prefixStyle('transitionProperty'), transitionDuration = prefixStyle('transitionDuration'), transformOrigin = prefixStyle('transformOrigin'), transitionTimingFunction = prefixStyle('transitionTimingFunction'), transitionDelay = prefixStyle('transitionDelay'), // Browser capabilities isAndroid = (/android/gi).test(navigator.appVersion), isIDevice = (/iphone|ipad/gi).test(navigator.appVersion), isTouchPad = (/hp-tablet/gi).test(navigator.appVersion), has3d = prefixStyle('perspective') in dummyStyle, hasTouch = 'ontouchstart' in window && !isTouchPad, hasTransform = vendor !== false, hasTransitionEnd = prefixStyle('transition') in dummyStyle, RESIZE_EV = 'onorientationchange' in window ? 'orientationchange' : 'resize', START_EV = hasTouch ? 'touchstart' : 'mousedown', MOVE_EV = hasTouch ? 'touchmove' : 'mousemove', END_EV = hasTouch ? 'touchend' : 'mouseup', CANCEL_EV = hasTouch ? 'touchcancel' : 'mouseup', TRNEND_EV = (function () { if ( vendor === false ) return false; var transitionEnd = { '' : 'transitionend', 'webkit' : 'webkitTransitionEnd', 'Moz' : 'transitionend', 'O' : 'otransitionend', 'ms' : 'MSTransitionEnd' }; return transitionEnd[vendor]; })(), nextFrame = (function() { return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame || function(callback) { return setTimeout(callback, 1); }; })(), cancelFrame = (function () { return window.cancelRequestAnimationFrame || window.webkitCancelAnimationFrame || window.webkitCancelRequestAnimationFrame || window.mozCancelRequestAnimationFrame || window.oCancelRequestAnimationFrame || window.msCancelRequestAnimationFrame || clearTimeout; })(), // Helpers translateZ = has3d ? ' translateZ(0)' : '', // Constructor iScroll = function (el, options) { var that = this, i; that.wrapper = typeof el == 'object' ? el : doc.getElementById(el); that.wrapper.style.overflow = 'hidden'; that.scroller = that.wrapper.children[0]; // Default options that.options = { hScroll: true, vScroll: true, x: 0, y: 0, bounce: true, bounceLock: false, momentum: true, lockDirection: true, useTransform: true, useTransition: false, topOffset: 0, checkDOMChanges: false, // Experimental handleClick: true, // Scrollbar hScrollbar: true, vScrollbar: true, fixedScrollbar: isAndroid, hideScrollbar: isIDevice, fadeScrollbar: isIDevice && has3d, scrollbarClass: '', // Zoom zoom: false, zoomMin: 1, zoomMax: 4, doubleTapZoom: 2, wheelAction: 'scroll', // Snap snap: false, snapThreshold: 1, // Events onRefresh: null, onBeforeScrollStart: function (e) { e.preventDefault(); }, onScrollStart: null, onBeforeScrollMove: null, onScrollMove: null, onBeforeScrollEnd: null, onScrollEnd: null, onTouchEnd: null, onDestroy: null, onZoomStart: null, onZoom: null, onZoomEnd: null }; // User defined options for (i in options) that.options[i] = options[i]; // Set starting position that.x = that.options.x; that.y = that.options.y; // Normalize options that.options.useTransform = hasTransform && that.options.useTransform; that.options.hScrollbar = that.options.hScroll && that.options.hScrollbar; that.options.vScrollbar = that.options.vScroll && that.options.vScrollbar; that.options.zoom = that.options.useTransform && that.options.zoom; that.options.useTransition = hasTransitionEnd && that.options.useTransition; // Helpers FIX ANDROID BUG! // translate3d and scale doesn't work together! // Ignoring 3d ONLY WHEN YOU SET that.options.zoom if ( that.options.zoom && isAndroid ){ translateZ = ''; } // Set some default styles that.scroller.style[transitionProperty] = that.options.useTransform ? cssVendor + 'transform' : 'top left'; that.scroller.style[transitionDuration] = '0'; that.scroller.style[transformOrigin] = '0 0'; if (that.options.useTransition) that.scroller.style[transitionTimingFunction] = 'cubic-bezier(0.33,0.66,0.66,1)'; if (that.options.useTransform) that.scroller.style[transform] = 'translate(' + that.x + 'px,' + that.y + 'px)' + translateZ; else that.scroller.style.cssText += ';position:absolute;top:' + that.y + 'px;left:' + that.x + 'px'; if (that.options.useTransition) that.options.fixedScrollbar = true; that.refresh(); that._bind(RESIZE_EV, window); that._bind(START_EV); if (!hasTouch) { if (that.options.wheelAction != 'none') { that._bind('DOMMouseScroll'); that._bind('mousewheel'); } } if (that.options.checkDOMChanges) that.checkDOMTime = setInterval(function () { that._checkDOMChanges(); }, 500); }; // Prototype iScroll.prototype = { enabled: true, x: 0, y: 0, steps: [], scale: 1, currPageX: 0, currPageY: 0, pagesX: [], pagesY: [], aniTime: null, wheelZoomCount: 0, handleEvent: function (e) { var that = this; switch(e.type) { case START_EV: if (!hasTouch && e.button !== 0) return; that._start(e); break; case MOVE_EV: that._move(e); break; case END_EV: case CANCEL_EV: that._end(e); break; case RESIZE_EV: that._resize(); break; case 'DOMMouseScroll': case 'mousewheel': that._wheel(e); break; case TRNEND_EV: that._transitionEnd(e); break; } }, _checkDOMChanges: function () { if (this.moved || this.zoomed || this.animating || (this.scrollerW == this.scroller.offsetWidth * this.scale && this.scrollerH == this.scroller.offsetHeight * this.scale)) return; this.refresh(); }, _scrollbar: function (dir) { var that = this, bar; if (!that[dir + 'Scrollbar']) { if (that[dir + 'ScrollbarWrapper']) { if (hasTransform) that[dir + 'ScrollbarIndicator'].style[transform] = ''; that[dir + 'ScrollbarWrapper'].parentNode.removeChild(that[dir + 'ScrollbarWrapper']); that[dir + 'ScrollbarWrapper'] = null; that[dir + 'ScrollbarIndicator'] = null; } return; } if (!that[dir + 'ScrollbarWrapper']) { // Create the scrollbar wrapper bar = doc.createElement('div'); if (that.options.scrollbarClass) bar.className = that.options.scrollbarClass + dir.toUpperCase(); else bar.style.cssText = 'position:absolute;z-index:100;' + (dir == 'h' ? 'height:7px;bottom:1px;left:2px;right:' + (that.vScrollbar ? '7' : '2') + 'px' : '7px;bottom:' + (that.hScrollbar ? '7' : '2') + 'px;top:2px;right:1px'); bar.style.cssText += ';pointer-events:none;' + cssVendor + 'transition-property:opacity;' + cssVendor + 'transition-duration:' + (that.options.fadeScrollbar ? '350ms' : '0') + ';overflow:hidden;opacity:' + (that.options.hideScrollbar ? '0' : '1'); that.wrapper.appendChild(bar); that[dir + 'ScrollbarWrapper'] = bar; // Create the scrollbar indicator bar = doc.createElement('div'); if (!that.options.scrollbarClass) { bar.style.cssText = 'position:absolute;z-index:100;background:rgba(0,0,0,0.5);border:1px solid rgba(255,255,255,0.9);' + cssVendor + 'background-clip:padding-box;' + cssVendor + 'box-sizing:border-box;' + (dir == 'h' ? 'height:100%' : '100%') + ';' + cssVendor + 'border-radius:3px;border-radius:3px'; } bar.style.cssText += ';pointer-events:none;' + cssVendor + 'transition-property:' + cssVendor + 'transform;' + cssVendor + 'transition-timing-function:cubic-bezier(0.33,0.66,0.66,1);' + cssVendor + 'transition-duration:0;' + cssVendor + 'transform: translate(0,0)' + translateZ; if (that.options.useTransition) bar.style.cssText += ';' + cssVendor + 'transition-timing-function:cubic-bezier(0.33,0.66,0.66,1)'; that[dir + 'ScrollbarWrapper'].appendChild(bar); that[dir + 'ScrollbarIndicator'] = bar; } if (dir == 'h') { that.hScrollbarSize = that.hScrollbarWrapper.clientWidth; that.hScrollbarIndicatorSize = m.max(m.round(that.hScrollbarSize * that.hScrollbarSize / that.scrollerW), 8); that.hScrollbarIndicator.style.width = that.hScrollbarIndicatorSize + 'px'; that.hScrollbarMaxScroll = that.hScrollbarSize - that.hScrollbarIndicatorSize; that.hScrollbarProp = that.hScrollbarMaxScroll / that.maxScrollX; } else { that.vScrollbarSize = that.vScrollbarWrapper.clientHeight; that.vScrollbarIndicatorSize = m.max(m.round(that.vScrollbarSize * that.vScrollbarSize / that.scrollerH), 8); that.vScrollbarIndicator.style.height = that.vScrollbarIndicatorSize + 'px'; that.vScrollbarMaxScroll = that.vScrollbarSize - that.vScrollbarIndicatorSize; that.vScrollbarProp = that.vScrollbarMaxScroll / that.maxScrollY; } // Reset position that._scrollbarPos(dir, true); }, _resize: function () { var that = this; setTimeout(function () { that.refresh(); }, isAndroid ? 200 : 0); }, _pos: function (x, y) { if (this.zoomed) return; x = this.hScroll ? x : 0; y = this.vScroll ? y : 0; if (this.options.useTransform) { this.scroller.style[transform] = 'translate(' + x + 'px,' + y + 'px) scale(' + this.scale + ')' + translateZ; } else { x = m.round(x); y = m.round(y); this.scroller.style.left = x + 'px'; this.scroller.style.top = y + 'px'; } this.x = x; this.y = y; this._scrollbarPos('h'); this._scrollbarPos('v'); }, _scrollbarPos: function (dir, hidden) { var that = this, pos = dir == 'h' ? that.x : that.y, size; if (!that[dir + 'Scrollbar']) return; pos = that[dir + 'ScrollbarProp'] * pos; if (pos < 0) { if (!that.options.fixedScrollbar) { size = that[dir + 'ScrollbarIndicatorSize'] + m.round(pos * 3); if (size < 8) size = 8; that[dir + 'ScrollbarIndicator'].style[dir == 'h' ? 'width' : 'height'] = size + 'px'; } pos = 0; } else if (pos > that[dir + 'ScrollbarMaxScroll']) { if (!that.options.fixedScrollbar) { size = that[dir + 'ScrollbarIndicatorSize'] - m.round((pos - that[dir + 'ScrollbarMaxScroll']) * 3); if (size < 8) size = 8; that[dir + 'ScrollbarIndicator'].style[dir == 'h' ? 'width' : 'height'] = size + 'px'; pos = that[dir + 'ScrollbarMaxScroll'] + (that[dir + 'ScrollbarIndicatorSize'] - size); } else { pos = that[dir + 'ScrollbarMaxScroll']; } } that[dir + 'ScrollbarWrapper'].style[transitionDelay] = '0'; that[dir + 'ScrollbarWrapper'].style.opacity = hidden && that.options.hideScrollbar ? '0' : '1'; that[dir + 'ScrollbarIndicator'].style[transform] = 'translate(' + (dir == 'h' ? pos + 'px,0)' : '0,' + pos + 'px)') + translateZ; }, _start: function (e) { var that = this, point = hasTouch ? e.touches[0] : e, matrix, x, y, c1, c2; if (!that.enabled) return; if (that.options.onBeforeScrollStart) that.options.onBeforeScrollStart.call(that, e); if (that.options.useTransition || that.options.zoom) that._transitionTime(0); that.moved = false; that.animating = false; that.zoomed = false; that.distX = 0; that.distY = 0; that.absDistX = 0; that.absDistY = 0; that.dirX = 0; that.dirY = 0; // Gesture start if (that.options.zoom && hasTouch && e.touches.length > 1) { c1 = m.abs(e.touches[0].pageX-e.touches[1].pageX); c2 = m.abs(e.touches[0].pageY-e.touches[1].pageY); that.touchesDistStart = m.sqrt(c1 * c1 + c2 * c2); that.originX = m.abs(e.touches[0].pageX + e.touches[1].pageX - that.wrapperOffsetLeft * 2) / 2 - that.x; that.originY = m.abs(e.touches[0].pageY + e.touches[1].pageY - that.wrapperOffsetTop * 2) / 2 - that.y; if (that.options.onZoomStart) that.options.onZoomStart.call(that, e); } if (that.options.momentum) { if (that.options.useTransform) { // Very lame general purpose alternative to CSSMatrix matrix = getComputedStyle(that.scroller, null)[transform].replace(/[^0-9-.,]/g, '').split(','); x = +(matrix[12] || matrix[4]); y = +(matrix[13] || matrix[5]); } else { x = +getComputedStyle(that.scroller, null).left.replace(/[^0-9-]/g, ''); y = +getComputedStyle(that.scroller, null).top.replace(/[^0-9-]/g, ''); } if (x != that.x || y != that.y) { if (that.options.useTransition) that._unbind(TRNEND_EV); else cancelFrame(that.aniTime); that.steps = []; that._pos(x, y); if (that.options.onScrollEnd) that.options.onScrollEnd.call(that); } } that.absStartX = that.x; // Needed by snap threshold that.absStartY = that.y; that.startX = that.x; that.startY = that.y; that.pointX = point.pageX; that.pointY = point.pageY; that.startTime = e.timeStamp || Date.now(); if (that.options.onScrollStart) that.options.onScrollStart.call(that, e); that._bind(MOVE_EV, window); that._bind(END_EV, window); that._bind(CANCEL_EV, window); }, _move: function (e) { var that = this, point = hasTouch ? e.touches[0] : e, deltaX = point.pageX - that.pointX, deltaY = point.pageY - that.pointY, newX = that.x + deltaX, newY = that.y + deltaY, c1, c2, scale, timestamp = e.timeStamp || Date.now(); if (that.options.onBeforeScrollMove) that.options.onBeforeScrollMove.call(that, e); // Zoom if (that.options.zoom && hasTouch && e.touches.length > 1) { c1 = m.abs(e.touches[0].pageX - e.touches[1].pageX); c2 = m.abs(e.touches[0].pageY - e.touches[1].pageY); that.touchesDist = m.sqrt(c1*c1+c2*c2); that.zoomed = true; scale = 1 / that.touchesDistStart * that.touchesDist * this.scale; if (scale < that.options.zoomMin) scale = 0.5 * that.options.zoomMin * Math.pow(2.0, scale / that.options.zoomMin); else if (scale > that.options.zoomMax) scale = 2.0 * that.options.zoomMax * Math.pow(0.5, that.options.zoomMax / scale); that.lastScale = scale / this.scale; newX = this.originX - this.originX * that.lastScale + this.x, newY = this.originY - this.originY * that.lastScale + this.y; this.scroller.style[transform] = 'translate(' + newX + 'px,' + newY + 'px) scale(' + scale + ')' + translateZ; if (that.options.onZoom) that.options.onZoom.call(that, e); return; } that.pointX = point.pageX; that.pointY = point.pageY; // Slow down if outside of the boundaries if (newX > 0 || newX < that.maxScrollX) { newX = that.options.bounce ? that.x + (deltaX / 2) : newX >= 0 || that.maxScrollX >= 0 ? 0 : that.maxScrollX; } if (newY > that.minScrollY || newY < that.maxScrollY) { newY = that.options.bounce ? that.y + (deltaY / 2) : newY >= that.minScrollY || that.maxScrollY >= 0 ? that.minScrollY : that.maxScrollY; } that.distX += deltaX; that.distY += deltaY; that.absDistX = m.abs(that.distX); that.absDistY = m.abs(that.distY); if (that.absDistX < 6 && that.absDistY < 6) { return; } // Lock direction if (that.options.lockDirection) { if (that.absDistX > that.absDistY + 5) { newY = that.y; deltaY = 0; } else if (that.absDistY > that.absDistX + 5) { newX = that.x; deltaX = 0; } } that.moved = true; that._pos(newX, newY); that.dirX = deltaX > 0 ? -1 : deltaX < 0 ? 1 : 0; that.dirY = deltaY > 0 ? -1 : deltaY < 0 ? 1 : 0; if (timestamp - that.startTime > 300) { that.startTime = timestamp; that.startX = that.x; that.startY = that.y; } if (that.options.onScrollMove) that.options.onScrollMove.call(that, e); }, _end: function (e) { if (hasTouch && e.touches.length !== 0) return; var that = this, point = hasTouch ? e.changedTouches[0] : e, target, ev, momentumX = { dist:0, time:0 }, momentumY = { dist:0, time:0 }, duration = (e.timeStamp || Date.now()) - that.startTime, newPosX = that.x, newPosY = that.y, distX, distY, newDuration, snap, scale; that._unbind(MOVE_EV, window); that._unbind(END_EV, window); that._unbind(CANCEL_EV, window); if (that.options.onBeforeScrollEnd) that.options.onBeforeScrollEnd.call(that, e); if (that.zoomed) { scale = that.scale * that.lastScale; scale = Math.max(that.options.zoomMin, scale); scale = Math.min(that.options.zoomMax, scale); that.lastScale = scale / that.scale; that.scale = scale; that.x = that.originX - that.originX * that.lastScale + that.x; that.y = that.originY - that.originY * that.lastScale + that.y; that.scroller.style[transitionDuration] = '200ms'; that.scroller.style[transform] = 'translate(' + that.x + 'px,' + that.y + 'px) scale(' + that.scale + ')' + translateZ; that.zoomed = false; that.refresh(); if (that.options.onZoomEnd) that.options.onZoomEnd.call(that, e); return; } if (!that.moved) { if (hasTouch) { if (that.doubleTapTimer && that.options.zoom) { // Double tapped clearTimeout(that.doubleTapTimer); that.doubleTapTimer = null; if (that.options.onZoomStart) that.options.onZoomStart.call(that, e); that.zoom(that.pointX, that.pointY, that.scale == 1 ? that.options.doubleTapZoom : 1); if (that.options.onZoomEnd) { setTimeout(function() { that.options.onZoomEnd.call(that, e); }, 200); // 200 is default zoom duration } } else if (this.options.handleClick) { that.doubleTapTimer = setTimeout(function () { that.doubleTapTimer = null; // Find the last touched element target = point.target; while (target.nodeType != 1) target = target.parentNode; if (target.tagName != 'SELECT' && target.tagName != 'INPUT' && target.tagName != 'TEXTAREA') { ev = doc.createEvent('MouseEvents'); ev.initMouseEvent('click', true, true, e.view, 1, point.screenX, point.screenY, point.clientX, point.clientY, e.ctrlKey, e.altKey, e.shiftKey, e.metaKey, 0, null); ev._fake = true; target.dispatchEvent(ev); } }, that.options.zoom ? 250 : 0); } } that._resetPos(400); if (that.options.onTouchEnd) that.options.onTouchEnd.call(that, e); return; } if (duration < 300 && that.options.momentum) { momentumX = newPosX ? that._momentum(newPosX - that.startX, duration, -that.x, that.scrollerW - that.wrapperW + that.x, that.options.bounce ? that.wrapperW : 0) : momentumX; momentumY = newPosY ? that._momentum(newPosY - that.startY, duration, -that.y, (that.maxScrollY < 0 ? that.scrollerH - that.wrapperH + that.y - that.minScrollY : 0), that.options.bounce ? that.wrapperH : 0) : momentumY; newPosX = that.x + momentumX.dist; newPosY = that.y + momentumY.dist; if ((that.x > 0 && newPosX > 0) || (that.x < that.maxScrollX && newPosX < that.maxScrollX)) momentumX = { dist:0, time:0 }; if ((that.y > that.minScrollY && newPosY > that.minScrollY) || (that.y < that.maxScrollY && newPosY < that.maxScrollY)) momentumY = { dist:0, time:0 }; } if (momentumX.dist || momentumY.dist) { newDuration = m.max(m.max(momentumX.time, momentumY.time), 10); // Do we need to snap? if (that.options.snap) { distX = newPosX - that.absStartX; distY = newPosY - that.absStartY; if (m.abs(distX) < that.options.snapThreshold && m.abs(distY) < that.options.snapThreshold) { that.scrollTo(that.absStartX, that.absStartY, 200); } else { snap = that._snap(newPosX, newPosY); newPosX = snap.x; newPosY = snap.y; newDuration = m.max(snap.time, newDuration); } } that.scrollTo(m.round(newPosX), m.round(newPosY), newDuration); if (that.options.onTouchEnd) that.options.onTouchEnd.call(that, e); return; } // Do we need to snap? if (that.options.snap) { distX = newPosX - that.absStartX; distY = newPosY - that.absStartY; if (m.abs(distX) < that.options.snapThreshold && m.abs(distY) < that.options.snapThreshold) that.scrollTo(that.absStartX, that.absStartY, 200); else { snap = that._snap(that.x, that.y); if (snap.x != that.x || snap.y != that.y) that.scrollTo(snap.x, snap.y, snap.time); } if (that.options.onTouchEnd) that.options.onTouchEnd.call(that, e); return; } that._resetPos(200); if (that.options.onTouchEnd) that.options.onTouchEnd.call(that, e); }, _resetPos: function (time) { var that = this, resetX = that.x >= 0 ? 0 : that.x < that.maxScrollX ? that.maxScrollX : that.x, resetY = that.y >= that.minScrollY || that.maxScrollY > 0 ? that.minScrollY : that.y < that.maxScrollY ? that.maxScrollY : that.y; if (resetX == that.x && resetY == that.y) { if (that.moved) { that.moved = false; if (that.options.onScrollEnd) that.options.onScrollEnd.call(that); // Execute custom code on scroll end } if (that.hScrollbar && that.options.hideScrollbar) { if (vendor == 'webkit') that.hScrollbarWrapper.style[transitionDelay] = '300ms'; that.hScrollbarWrapper.style.opacity = '0'; } if (that.vScrollbar && that.options.hideScrollbar) { if (vendor == 'webkit') that.vScrollbarWrapper.style[transitionDelay] = '300ms'; that.vScrollbarWrapper.style.opacity = '0'; } return; } that.scrollTo(resetX, resetY, time || 0); }, _wheel: function (e) { var that = this, wheelDeltaX, wheelDeltaY, deltaX, deltaY, deltaScale; if ('wheelDeltaX' in e) { wheelDeltaX = e.wheelDeltaX / 12; wheelDeltaY = e.wheelDeltaY / 12; } else if('wheelDelta' in e) { wheelDeltaX = wheelDeltaY = e.wheelDelta / 12; } else if ('detail' in e) { wheelDeltaX = wheelDeltaY = -e.detail * 3; } else { return; } if (that.options.wheelAction == 'zoom') { deltaScale = that.scale * Math.pow(2, 1/3 * (wheelDeltaY ? wheelDeltaY / Math.abs(wheelDeltaY) : 0)); if (deltaScale < that.options.zoomMin) deltaScale = that.options.zoomMin; if (deltaScale > that.options.zoomMax) deltaScale = that.options.zoomMax; if (deltaScale != that.scale) { if (!that.wheelZoomCount && that.options.onZoomStart) that.options.onZoomStart.call(that, e); that.wheelZoomCount++; that.zoom(e.pageX, e.pageY, deltaScale, 400); setTimeout(function() { that.wheelZoomCount--; if (!that.wheelZoomCount && that.options.onZoomEnd) that.options.onZoomEnd.call(that, e); }, 400); } return; } deltaX = that.x + wheelDeltaX; deltaY = that.y + wheelDeltaY; if (deltaX > 0) deltaX = 0; else if (deltaX < that.maxScrollX) deltaX = that.maxScrollX; if (deltaY > that.minScrollY) deltaY = that.minScrollY; else if (deltaY < that.maxScrollY) deltaY = that.maxScrollY; if (that.maxScrollY < 0) { that.scrollTo(deltaX, deltaY, 0); } }, _transitionEnd: function (e) { var that = this; if (e.target != that.scroller) return; that._unbind(TRNEND_EV); that._startAni(); }, /** * * Utilities * */ _startAni: function () { var that = this, startX = that.x, startY = that.y, startTime = Date.now(), step, easeOut, animate; if (that.animating) return; if (!that.steps.length) { that._resetPos(400); return; } step = that.steps.shift(); if (step.x == startX && step.y == startY) step.time = 0; that.animating = true; that.moved = true; if (that.options.useTransition) { that._transitionTime(step.time); that._pos(step.x, step.y); that.animating = false; if (step.time) that._bind(TRNEND_EV); else that._resetPos(0); return; } animate = function () { var now = Date.now(), newX, newY; if (now >= startTime + step.time) { that._pos(step.x, step.y); that.animating = false; if (that.options.onAnimationEnd) that.options.onAnimationEnd.call(that); // Execute custom code on animation end that._startAni(); return; } now = (now - startTime) / step.time - 1; easeOut = m.sqrt(1 - now * now); newX = (step.x - startX) * easeOut + startX; newY = (step.y - startY) * easeOut + startY; that._pos(newX, newY); if (that.animating) that.aniTime = nextFrame(animate); }; animate(); }, _transitionTime: function (time) { time += 'ms'; this.scroller.style[transitionDuration] = time; if (this.hScrollbar) this.hScrollbarIndicator.style[transitionDuration] = time; if (this.vScrollbar) this.vScrollbarIndicator.style[transitionDuration] = time; }, _momentum: function (dist, time, maxDistUpper, maxDistLower, size) { var deceleration = 0.0006, speed = m.abs(dist) / time, newDist = (speed * speed) / (2 * deceleration), newTime = 0, outsideDist = 0; // Proportinally reduce speed if we are outside of the boundaries if (dist > 0 && newDist > maxDistUpper) { outsideDist = size / (6 / (newDist / speed * deceleration)); maxDistUpper = maxDistUpper + outsideDist; speed = speed * maxDistUpper / newDist; newDist = maxDistUpper; } else if (dist < 0 && newDist > maxDistLower) { outsideDist = size / (6 / (newDist / speed * deceleration)); maxDistLower = maxDistLower + outsideDist; speed = speed * maxDistLower / newDist; newDist = maxDistLower; } newDist = newDist * (dist < 0 ? -1 : 1); newTime = speed / deceleration; return { dist: newDist, time: m.round(newTime) }; }, _offset: function (el) { var left = -el.offsetLeft, top = -el.offsetTop; while (el = el.offsetParent) { left -= el.offsetLeft; top -= el.offsetTop; } if (el != this.wrapper) { left *= this.scale; top *= this.scale; } return { left: left, top: top }; }, _snap: function (x, y) { var that = this, i, l, page, time, sizeX, sizeY; // Check page X page = that.pagesX.length - 1; for (i=0, l=that.pagesX.length; i<l; i++) { if (x >= that.pagesX[i]) { page = i; break; } } if (page == that.currPageX && page > 0 && that.dirX < 0) page--; x = that.pagesX[page]; sizeX = m.abs(x - that.pagesX[that.currPageX]); sizeX = sizeX ? m.abs(that.x - x) / sizeX * 500 : 0; that.currPageX = page; // Check page Y page = that.pagesY.length-1; for (i=0; i<page; i++) { if (y >= that.pagesY[i]) { page = i; break; } } if (page == that.currPageY && page > 0 && that.dirY < 0) page--; y = that.pagesY[page]; sizeY = m.abs(y - that.pagesY[that.currPageY]); sizeY = sizeY ? m.abs(that.y - y) / sizeY * 500 : 0; that.currPageY = page; // Snap with constant speed (proportional duration) time = m.round(m.max(sizeX, sizeY)) || 200; return { x: x, y: y, time: time }; }, _bind: function (type, el, bubble) { (el || this.scroller).addEventListener(type, this, !!bubble); }, _unbind: function (type, el, bubble) { (el || this.scroller).removeEventListener(type, this, !!bubble); }, /** * * Public methods * */ destroy: function () { var that = this; that.scroller.style[transform] = ''; // Remove the scrollbars that.hScrollbar = false; that.vScrollbar = false; that._scrollbar('h'); that._scrollbar('v'); // Remove the event listeners that._unbind(RESIZE_EV, window); that._unbind(START_EV); that._unbind(MOVE_EV, window); that._unbind(END_EV, window); that._unbind(CANCEL_EV, window); if (!that.options.hasTouch) { that._unbind('DOMMouseScroll'); that._unbind('mousewheel'); } if (that.options.useTransition) that._unbind(TRNEND_EV); if (that.options.checkDOMChanges) clearInterval(that.checkDOMTime); if (that.options.onDestroy) that.options.onDestroy.call(that); }, refresh: function () { var that = this, offset, i, l, els, pos = 0, page = 0; if (that.scale < that.options.zoomMin) that.scale = that.options.zoomMin; that.wrapperW = that.wrapper.clientWidth || 1; that.wrapperH = that.wrapper.clientHeight || 1; that.minScrollY = -that.options.topOffset || 0; that.scrollerW = m.round(that.scroller.offsetWidth * that.scale); that.scrollerH = m.round((that.scroller.offsetHeight + that.minScrollY) * that.scale); that.maxScrollX = that.wrapperW - that.scrollerW; that.maxScrollY = that.wrapperH - that.scrollerH + that.minScrollY; that.dirX = 0; that.dirY = 0; if (that.options.onRefresh) that.options.onRefresh.call(that); that.hScroll = that.options.hScroll && that.maxScrollX < 0; that.vScroll = that.options.vScroll && (!that.options.bounceLock && !that.hScroll || that.scrollerH > that.wrapperH); that.hScrollbar = that.hScroll && that.options.hScrollbar; that.vScrollbar = that.vScroll && that.options.vScrollbar && that.scrollerH > that.wrapperH; offset = that._offset(that.wrapper); that.wrapperOffsetLeft = -offset.left; that.wrapperOffsetTop = -offset.top; // Prepare snap if (typeof that.options.snap == 'string') { that.pagesX = []; that.pagesY = []; els = that.scroller.querySelectorAll(that.options.snap); for (i=0, l=els.length; i<l; i++) { pos = that._offset(els[i]); pos.left += that.wrapperOffsetLeft; pos.top += that.wrapperOffsetTop; that.pagesX[i] = pos.left < that.maxScrollX ? that.maxScrollX : pos.left * that.scale; that.pagesY[i] = pos.top < that.maxScrollY ? that.maxScrollY : pos.top * that.scale; } } else if (that.options.snap) { that.pagesX = []; while (pos >= that.maxScrollX) { that.pagesX[page] = pos; pos = pos - that.wrapperW; page++; } if (that.maxScrollX%that.wrapperW) that.pagesX[that.pagesX.length] = that.maxScrollX - that.pagesX[that.pagesX.length-1] + that.pagesX[that.pagesX.length-1]; pos = 0; page = 0; that.pagesY = []; while (pos >= that.maxScrollY) { that.pagesY[page] = pos; pos = pos - that.wrapperH; page++; } if (that.maxScrollY%that.wrapperH) that.pagesY[that.pagesY.length] = that.maxScrollY - that.pagesY[that.pagesY.length-1] + that.pagesY[that.pagesY.length-1]; } // Prepare the scrollbars that._scrollbar('h'); that._scrollbar('v'); if (!that.zoomed) { that.scroller.style[transitionDuration] = '0'; that._resetPos(400); } }, scrollTo: function (x, y, time, relative) { var that = this, step = x, i, l; that.stop(); if (!step.length) step = [{ x: x, y: y, time: time, relative: relative }]; for (i=0, l=step.length; i<l; i++) { if (step[i].relative) { step[i].x = that.x - step[i].x; step[i].y = that.y - step[i].y; } that.steps.push({ x: step[i].x, y: step[i].y, time: step[i].time || 0 }); } that._startAni(); }, scrollToElement: function (el, time) { var that = this, pos; el = el.nodeType ? el : that.scroller.querySelector(el); if (!el) return; pos = that._offset(el); pos.left += that.wrapperOffsetLeft; pos.top += that.wrapperOffsetTop; pos.left = pos.left > 0 ? 0 : pos.left < that.maxScrollX ? that.maxScrollX : pos.left; pos.top = pos.top > that.minScrollY ? that.minScrollY : pos.top < that.maxScrollY ? that.maxScrollY : pos.top; time = time === undefined ? m.max(m.abs(pos.left)*2, m.abs(pos.top)*2) : time; that.scrollTo(pos.left, pos.top, time); }, scrollToPage: function (pageX, pageY, time) { var that = this, x, y; time = time === undefined ? 400 : time; if (that.options.onScrollStart) that.options.onScrollStart.call(that); if (that.options.snap) { pageX = pageX == 'next' ? that.currPageX+1 : pageX == 'prev' ? that.currPageX-1 : pageX; pageY = pageY == 'next' ? that.currPageY+1 : pageY == 'prev' ? that.currPageY-1 : pageY; pageX = pageX < 0 ? 0 : pageX > that.pagesX.length-1 ? that.pagesX.length-1 : pageX; pageY = pageY < 0 ? 0 : pageY > that.pagesY.length-1 ? that.pagesY.length-1 : pageY; that.currPageX = pageX; that.currPageY = pageY; x = that.pagesX[pageX]; y = that.pagesY[pageY]; } else { x = -that.wrapperW * pageX; y = -that.wrapperH * pageY; if (x < that.maxScrollX) x = that.maxScrollX; if (y < that.maxScrollY) y = that.maxScrollY; } that.scrollTo(x, y, time); }, disable: function () { this.stop(); this._resetPos(0); this.enabled = false; // If disabled after touchstart we make sure that there are no left over events this._unbind(MOVE_EV, window); this._unbind(END_EV, window); this._unbind(CANCEL_EV, window); }, enable: function () { this.enabled = true; }, stop: function () { if (this.options.useTransition) this._unbind(TRNEND_EV); else cancelFrame(this.aniTime); this.steps = []; this.moved = false; this.animating = false; }, zoom: function (x, y, scale, time) { var that = this, relScale = scale / that.scale; if (!that.options.useTransform) return; that.zoomed = true; time = time === undefined ? 200 : time; x = x - that.wrapperOffsetLeft - that.x; y = y - that.wrapperOffsetTop - that.y; that.x = x - x * relScale + that.x; that.y = y - y * relScale + that.y; that.scale = scale; that.refresh(); that.x = that.x > 0 ? 0 : that.x < that.maxScrollX ? that.maxScrollX : that.x; that.y = that.y > that.minScrollY ? that.minScrollY : that.y < that.maxScrollY ? that.maxScrollY : that.y; that.scroller.style[transitionDuration] = time + 'ms'; that.scroller.style[transform] = 'translate(' + that.x + 'px,' + that.y + 'px) scale(' + scale + ')' + translateZ; that.zoomed = false; }, isReady: function () { return !this.moved && !this.zoomed && !this.animating; } }; function prefixStyle (style) { if ( vendor === '' ) return style; style = style.charAt(0).toUpperCase() + style.substr(1); return vendor + style; } dummyStyle = null; // for the sake of it if (typeof exports !== 'undefined') exports.iScroll = iScroll; else window.iScroll = iScroll; })(window, document);
实际效果图
