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(function($, window, document) {
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var STATE_BEFORECHANGEOFFSET = 'beforeChangeOffset';
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var STATE_AFTERCHANGEOFFSET = 'afterChangeOffset';
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var EVENT_PULLSTART = 'pullstart';
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var EVENT_PULLING = 'pulling';
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var EVENT_BEFORECHANGEOFFSET = STATE_BEFORECHANGEOFFSET;
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var EVENT_AFTERCHANGEOFFSET = STATE_AFTERCHANGEOFFSET;
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var EVENT_DRAGENDAFTERCHANGEOFFSET = 'dragEndAfterChangeOffset';
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var CLASS_TRANSITIONING = $.className('transitioning');
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var CLASS_PULL_TOP_TIPS = $.className('pull-top-tips');
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var CLASS_PULL_BOTTOM_TIPS = $.className('pull-bottom-tips');
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var CLASS_PULL_LOADING = $.className('pull-loading');
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var CLASS_SCROLL = $.className('scroll');
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var CLASS_PULL_TOP_ARROW = $.className('pull-loading') + ' ' + $.className('icon') + ' ' + $.className('icon-pulldown');
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var CLASS_PULL_TOP_ARROW_REVERSE = CLASS_PULL_TOP_ARROW + ' ' + $.className('reverse');
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var CLASS_PULL_TOP_SPINNER = $.className('pull-loading') + ' ' + $.className('spinner');
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var CLASS_HIDDEN = $.className('hidden');
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var SELECTOR_PULL_LOADING = '.' + CLASS_PULL_LOADING;
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$.PullToRefresh = $.Class.extend({
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init: function(element, options) {
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this.element = element;
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this.options = $.extend(true, {
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down: {
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height: 75,
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callback: false,
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},
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up: {
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auto: false,
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offset: 100, //距离底部高度(到达该高度即触发)
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show: true,
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contentinit: '上拉显示更多',
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contentdown: '上拉显示更多',
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contentrefresh: '正在加载...',
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contentnomore: '没有更多数据了',
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callback: false
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},
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preventDefaultException: {
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tagName: /^(INPUT|TEXTAREA|BUTTON|SELECT)$/
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}
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}, options);
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this.stopped = this.isNeedRefresh = this.isDragging = false;
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this.state = STATE_BEFORECHANGEOFFSET;
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this.isInScroll = this.element.classList.contains(CLASS_SCROLL);
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this.initPullUpTips();
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this.initEvent();
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},
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_preventDefaultException: function(el, exceptions) {
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for (var i in exceptions) {
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if (exceptions[i].test(el[i])) {
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return true;
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}
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}
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return false;
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},
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initEvent: function() {
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if ($.isFunction(this.options.down.callback)) {
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this.element.addEventListener($.EVENT_START, this);
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this.element.addEventListener('drag', this);
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this.element.addEventListener('dragend', this);
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}
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if (this.pullUpTips) {
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this.element.addEventListener('dragup', this);
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if (this.isInScroll) {
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this.element.addEventListener('scrollbottom', this);
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} else {
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window.addEventListener('scroll', this);
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}
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}
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},
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handleEvent: function(e) {
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switch (e.type) {
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case $.EVENT_START:
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this.isInScroll && this._canPullDown() && e.target && !this._preventDefaultException(e.target, this.options.preventDefaultException) && e.preventDefault();
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break;
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case 'drag':
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this._drag(e);
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break;
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case 'dragend':
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this._dragend(e);
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break;
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case 'webkitTransitionEnd':
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this._transitionEnd(e);
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break;
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case 'dragup':
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case 'scroll':
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this._dragup(e);
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break;
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case 'scrollbottom':
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if (e.target === this.element) {
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this.pullUpLoading(e);
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}
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break;
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}
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},
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initPullDownTips: function() {
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var self = this;
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if ($.isFunction(self.options.down.callback)) {
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self.pullDownTips = (function() {
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var element = document.querySelector('.' + CLASS_PULL_TOP_TIPS);
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if (element) {
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element.parentNode.removeChild(element);
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}
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if (!element) {
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element = document.createElement('div');
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element.classList.add(CLASS_PULL_TOP_TIPS);
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element.innerHTML = '<div class="mui-pull-top-wrapper"><span class="mui-pull-loading mui-icon mui-icon-pulldown"></span></div>';
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element.addEventListener('webkitTransitionEnd', self);
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}
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self.pullDownTipsIcon = element.querySelector(SELECTOR_PULL_LOADING);
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document.body.appendChild(element);
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return element;
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}());
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}
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},
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initPullUpTips: function() {
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var self = this;
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if ($.isFunction(self.options.up.callback)) {
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self.pullUpTips = (function() {
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var element = self.element.querySelector('.' + CLASS_PULL_BOTTOM_TIPS);
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if (!element) {
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element = document.createElement('div');
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element.classList.add(CLASS_PULL_BOTTOM_TIPS);
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if (!self.options.up.show) {
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element.classList.add(CLASS_HIDDEN);
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}
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element.innerHTML = '<div class="mui-pull-bottom-wrapper"><span class="mui-pull-loading">' + self.options.up.contentinit + '</span></div>';
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self.element.appendChild(element);
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}
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self.pullUpTipsIcon = element.querySelector(SELECTOR_PULL_LOADING);
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return element;
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}());
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}
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},
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_transitionEnd: function(e) {
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if (e.target === this.pullDownTips && this.removing) {
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this.removePullDownTips();
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}
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},
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_dragup: function(e) {
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var self = this;
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if (self.loading) {
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return;
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}
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if (e && e.detail && $.gestures.session.drag) {
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self.isDraggingUp = true;
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} else {
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if (!self.isDraggingUp) { //scroll event
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return;
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}
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}
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if (!self.isDragging) {
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if (self._canPullUp()) {
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self.pullUpLoading(e);
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}
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}
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},
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_canPullUp: function() {
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if (this.removing) {
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return false;
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}
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if (this.isInScroll) {
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var scrollId = this.element.parentNode.getAttribute('data-scroll');
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if (scrollId) {
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var scrollApi = $.data[scrollId];
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return scrollApi.y === scrollApi.maxScrollY;
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}
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}
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return window.pageYOffset + window.innerHeight + this.options.up.offset >= document.documentElement.scrollHeight;
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},
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_canPullDown: function() {
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if (this.removing) {
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return false;
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}
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if (this.isInScroll) {
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var scrollId = this.element.parentNode.getAttribute('data-scroll');
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if (scrollId) {
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var scrollApi = $.data[scrollId];
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return scrollApi.y === 0;
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}
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}
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return document.body.scrollTop === 0;
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},
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_drag: function(e) {
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if (this.loading || this.stopped) {
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e.stopPropagation();
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e.detail.gesture.preventDefault();
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return;
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}
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var detail = e.detail;
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if (!this.isDragging) {
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if (detail.direction === 'down' && this._canPullDown()) {
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if (document.querySelector('.' + CLASS_PULL_TOP_TIPS)) {
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e.stopPropagation();
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e.detail.gesture.preventDefault();
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return;
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}
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this.isDragging = true;
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this.removing = false;
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this.startDeltaY = detail.deltaY;
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$.gestures.session.lockDirection = true; //锁定方向
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$.gestures.session.startDirection = detail.direction;
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this._pullStart(this.startDeltaY);
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}
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}
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if (this.isDragging) {
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e.stopPropagation();
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e.detail.gesture.preventDefault();
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var deltaY = detail.deltaY - this.startDeltaY;
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deltaY = Math.min(deltaY, 1.5 * this.options.down.height);
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this.deltaY = deltaY;
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this._pulling(deltaY);
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var state = deltaY > this.options.down.height ? STATE_AFTERCHANGEOFFSET : STATE_BEFORECHANGEOFFSET;
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if (this.state !== state) {
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this.state = state;
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if (this.state === STATE_AFTERCHANGEOFFSET) {
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this.removing = false;
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this.isNeedRefresh = true;
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} else {
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this.removing = true;
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this.isNeedRefresh = false;
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}
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this['_' + state](deltaY);
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}
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if ($.os.ios && parseFloat($.os.version) >= 8) {
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var clientY = detail.gesture.touches[0].clientY;
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if ((clientY + 10) > window.innerHeight || clientY < 10) {
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this._dragend(e);
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return;
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}
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}
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}
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},
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_dragend: function(e) {
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var self = this;
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if (self.isDragging) {
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self.isDragging = false;
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self._dragEndAfterChangeOffset(self.isNeedRefresh);
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}
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if (self.isPullingUp) {
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if (self.pullingUpTimeout) {
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clearTimeout(self.pullingUpTimeout);
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}
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self.pullingUpTimeout = setTimeout(function() {
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self.isPullingUp = false;
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}, 1000);
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}
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},
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_pullStart: function(startDeltaY) {
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this.pullStart(startDeltaY);
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$.trigger(this.element, EVENT_PULLSTART, {
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api: this,
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startDeltaY: startDeltaY
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});
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},
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_pulling: function(deltaY) {
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this.pulling(deltaY);
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$.trigger(this.element, EVENT_PULLING, {
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api: this,
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deltaY: deltaY
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});
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},
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_beforeChangeOffset: function(deltaY) {
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this.beforeChangeOffset(deltaY);
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$.trigger(this.element, EVENT_BEFORECHANGEOFFSET, {
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api: this,
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deltaY: deltaY
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});
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},
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_afterChangeOffset: function(deltaY) {
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this.afterChangeOffset(deltaY);
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$.trigger(this.element, EVENT_AFTERCHANGEOFFSET, {
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api: this,
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deltaY: deltaY
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});
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},
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_dragEndAfterChangeOffset: function(isNeedRefresh) {
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this.dragEndAfterChangeOffset(isNeedRefresh);
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$.trigger(this.element, EVENT_DRAGENDAFTERCHANGEOFFSET, {
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api: this,
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isNeedRefresh: isNeedRefresh
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});
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},
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removePullDownTips: function() {
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if (this.pullDownTips) {
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try {
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this.pullDownTips.parentNode && this.pullDownTips.parentNode.removeChild(this.pullDownTips);
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this.pullDownTips = null;
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this.removing = false;
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} catch (e) {}
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}
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},
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pullStart: function(startDeltaY) {
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this.initPullDownTips(startDeltaY);
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},
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pulling: function(deltaY) {
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this.pullDownTips.style.webkitTransform = 'translate3d(0,' + deltaY + 'px,0)';
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},
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beforeChangeOffset: function(deltaY) {
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this.pullDownTipsIcon.className = CLASS_PULL_TOP_ARROW;
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},
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afterChangeOffset: function(deltaY) {
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this.pullDownTipsIcon.className = CLASS_PULL_TOP_ARROW_REVERSE;
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},
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dragEndAfterChangeOffset: function(isNeedRefresh) {
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if (isNeedRefresh) {
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this.pullDownTipsIcon.className = CLASS_PULL_TOP_SPINNER;
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this.pullDownLoading();
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} else {
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this.pullDownTipsIcon.className = CLASS_PULL_TOP_ARROW;
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this.endPullDownToRefresh();
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}
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},
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pullDownLoading: function() {
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if (this.loading) {
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return;
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}
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if (!this.pullDownTips) {
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this.initPullDownTips();
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this.dragEndAfterChangeOffset(true);
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return;
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}
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this.loading = true;
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this.pullDownTips.classList.add(CLASS_TRANSITIONING);
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this.pullDownTips.style.webkitTransform = 'translate3d(0,' + this.options.down.height + 'px,0)';
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this.options.down.callback.apply(this);
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},
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pullUpLoading: function(e) {
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if (this.loading || this.finished) {
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return;
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}
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this.loading = true;
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this.isDraggingUp = false;
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this.pullUpTips.classList.remove(CLASS_HIDDEN);
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e && e.detail && e.detail.gesture && e.detail.gesture.preventDefault();
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this.pullUpTipsIcon.innerHTML = this.options.up.contentrefresh;
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this.options.up.callback.apply(this);
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},
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endPullDownToRefresh: function() {
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this.loading = false;
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this.pullUpTips && this.pullUpTips.classList.remove(CLASS_HIDDEN);
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this.pullDownTips.classList.add(CLASS_TRANSITIONING);
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this.pullDownTips.style.webkitTransform = 'translate3d(0,0,0)';
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if (this.deltaY <= 0) {
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this.removePullDownTips();
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} else {
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this.removing = true;
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}
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if (this.isInScroll) {
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$(this.element.parentNode).scroll().refresh();
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}
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},
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endPullUpToRefresh: function(finished) {
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if (finished) {
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this.finished = true;
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this.pullUpTipsIcon.innerHTML = this.options.up.contentnomore;
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this.element.removeEventListener('dragup', this);
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window.removeEventListener('scroll', this);
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} else {
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this.pullUpTipsIcon.innerHTML = this.options.up.contentdown;
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}
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this.loading = false;
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if (this.isInScroll) {
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$(this.element.parentNode).scroll().refresh();
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}
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},
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setStopped: function(stopped) {
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if (stopped != this.stopped) {
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this.stopped = stopped;
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this.pullUpTips && this.pullUpTips.classList[stopped ? 'add' : 'remove'](CLASS_HIDDEN);
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}
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},
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refresh: function(isReset) {
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if (isReset && this.finished && this.pullUpTipsIcon) {
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this.pullUpTipsIcon.innerHTML = this.options.up.contentdown;
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this.element.addEventListener('dragup', this);
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window.addEventListener('scroll', this);
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this.finished = false;
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}
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}
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});
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$.fn.pullToRefresh = function(options) {
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var pullRefreshApis = [];
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options = options || {};
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this.each(function() {
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var self = this;
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var pullRefreshApi = null;
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var id = self.getAttribute('data-pullToRefresh');
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if (!id) {
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id = ++$.uuid;
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$.data[id] = pullRefreshApi = new $.PullToRefresh(self, options);
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self.setAttribute('data-pullToRefresh', id);
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} else {
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pullRefreshApi = $.data[id];
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}
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if (options.up && options.up.auto) { //如果设置了auto，则自动上拉一次
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pullRefreshApi.pullUpLoading();
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}
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pullRefreshApis.push(pullRefreshApi);
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});
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return pullRefreshApis.length === 1 ? pullRefreshApis[0] : pullRefreshApis;
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}
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})(mui, window, document); |
