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移動(dòng)端翻頁(yè)插件dropload.js(支持Zepto和jQuery)

2019-11-20 09:24:29
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來(lái)源:轉(zhuǎn)載
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dropload.js提供了最基本的上拉翻頁(yè),下拉刷新功能。對(duì)于由服務(wù)端一次返回所有數(shù)據(jù)的情況基本通用。
但是,需求往往不是服務(wù)端一次性返回所有數(shù)據(jù),往往還要支持服務(wù)端分頁(yè),搜索,排序,多條件篩選等功能。(比較類似美團(tuán)美食的界面)

一、解決方案

改進(jìn)1:由于有分頁(yè),搜索,排序,多條件篩選功能,可能都不需要上拉,進(jìn)到頁(yè)面就沒(méi)有數(shù)據(jù)。
例如:搜索一個(gè)服務(wù)端不存在的名字。
所以,添加接口設(shè)置setHasData。 

MyDropLoad.prototype.setHasData = function(ishasData) {  var me = this;  if (ishasData) {   me.isData = true;   me.$domDown.html(me.opts.domDown.domRefresh);   fnRecoverContentHeight(me);  } else {   me.isData = false;   me.$domDown.html(me.opts.domDown.domNoData);   fnRecoverContentHeight(me);  } }; 

改進(jìn)2:由以上問(wèn)題還引發(fā)了一個(gè)bug,選擇不同的篩選條件,然后上拉加載更多,此時(shí)沒(méi)有反應(yīng)了。
原因較復(fù)雜,舉例說(shuō)明:選擇不同的篩選條件,數(shù)據(jù)量不一樣,如果不執(zhí)行resetload,那么頁(yè)面的的上拉計(jì)算距離就存在問(wèn)題。
1. 只要發(fā)API到服務(wù)端,無(wú)論返回成功失敗,都必須執(zhí)行resetload,成功時(shí)需要在加載完全部新增的數(shù)據(jù)后resetload。
2. 更改resetload如下,添加調(diào)用計(jì)算屏幕尺寸的方法。 

MyDropLoad.prototype.resetload = function() {  var me = this;  if (me.direction == 'down' && me.upInsertDOM) {   me.$domUp.css({ 'height': '0' }).on('webkitTransitionEnd mozTransitionEnd transitionend', function() {    me.loading = false;    me.upInsertDOM = false;    $(this).remove();    fnRecoverContentHeight(me);   });  } else if (me.direction == 'up') {   me.loading = false;   if (me.isData) {    me.$domDown.html(me.opts.domDown.domRefresh);    fnRecoverContentHeight(me);   } else {    me.$domDown.html(me.opts.domDown.domNoData);   }  } } 

3. 解決以上兩個(gè)問(wèn)題,基本解決了90%的問(wèn)題,還有一個(gè)是setHasData(false)之后的處理。(假設(shè)每頁(yè)的count時(shí)20條)
bug: 在篩序條件1:返回20條數(shù)據(jù),上拉加載更多返回10條數(shù)據(jù),此時(shí)設(shè)置setHasData(false)。選擇篩選條件2,返回20條數(shù)據(jù),上拉加載,你會(huì)驚奇的發(fā)現(xiàn)拉不動(dòng)了。
why: setHasData(false)之后狀態(tài)還停留在沒(méi)有更多數(shù)據(jù)的狀態(tài)。此時(shí)應(yīng)該鎖定了上拉加載,更改篩選條件后,沒(méi)有解除鎖定,所以不能上拉加載了。
解決方法:每次更改搜索條件,篩選條件,排序等時(shí),都需要設(shè)置setHasData(true)。

二、調(diào)用方法
整體頁(yè)面邏輯較復(fù)雜。這里在整體解釋一遍。
1. 選擇要上拉加載的DIV,添加調(diào)用方法。
注意事項(xiàng):
 (1)記得保存返回對(duì)象。
 (2)LoadDownFn時(shí)上拉加載后的回調(diào),這里自己要處理的邏輯。我這里時(shí)翻頁(yè)發(fā)API,API參數(shù)中offset加20,然后發(fā)API。
 (3)無(wú)論API返回失敗成功,都必須resetload。
這里強(qiáng)調(diào):
fetchData函數(shù)調(diào)用發(fā)API,失敗或者成功都必須self.moreFund.resetload()。
并且失敗時(shí)直接調(diào)用self.moreFund.resetload()即可。成功時(shí)要在新的數(shù)據(jù)返回后,要先用JS動(dòng)態(tài)加載HTML,加載完成后在執(zhí)行self.moreFund.resetload()。 

self.moreFund = $('#table-fundlist').dropload({ scrollArea: window, domDown: {  domClass: 'dropload-down',  domRefresh: '<div class="dropload-refresh"><img class="drop-up-icon" src="images/dropload_up.png"><span>上拉加載更多</span></div>',  domLoad: '<div class="dropload-load"><img class="loading-icon" src="images/droploading.gif"></div>',  domNoData: '' }, loadDownFn: function() {  self.apiParams.offset += 20;  self.fetchData(true); }}); 

2. setHasData詳解
(1)什么時(shí)候需要設(shè)置true。
當(dāng)非翻頁(yè)API觸發(fā)之前。即選擇新的篩選條件,選擇新的搜索字段,選擇新的排序字段。這個(gè)時(shí)候必須setHasData(true)。
 this.moreFund.setHasData(true);
(2)什么時(shí)候設(shè)置false。
服務(wù)端返回?cái)?shù)據(jù)后,比較服務(wù)端返回的條目數(shù)與API發(fā)送的條目數(shù)是否一致,不一致設(shè)置setHasData(false)。

 if (data.length < this.apiParams.count){       this.moreFund.setHasData(false); this.moreFund.lock();} 

3. lock與unlock詳解
(1)什么時(shí)候設(shè)置lock。
服務(wù)端返回?cái)?shù)據(jù)后,比較服務(wù)端返回的條目數(shù)與API發(fā)送的條目數(shù)是否一致,不一致設(shè)置lock()。
當(dāng)前頁(yè)面狀態(tài)不需要上拉加載時(shí)需要設(shè)置lock()。例如:在搜索框輸入的狀態(tài)。
(2)什么時(shí)候設(shè)置unlock。
只有一個(gè)地方需要調(diào)用。發(fā)送API之前設(shè)置unlock。 

if (self.moreFund) { self.moreFund.unlock();} 

三、JS和CSS源代碼 

js:

(function($) { 'use strict'; var win = window; var doc = document; var $win = $(win); var $doc = $(doc); $.fn.dropload = function(options) {  return new MyDropLoad(this, options); }; var MyDropLoad = function(element, options) {  var me = this;  me.$element = $(element);  me.upInsertDOM = false;  me.loading = false;  me.isLockUp = false;  me.isLockDown = false;  me.isData = true;  me._scrollTop = 0;  me.init(options); }; MyDropLoad.prototype.init = function(options) {  var me = this;  me.opts = $.extend({}, {   scrollArea: me.$element,   domUp: {    domClass: 'dropload-up',    domRefresh: '<div class="dropload-refresh"><img class="drop-down-icon" src="../images/dropload_down.png"><span>下拉刷新</span></div>',    domUpdate: '<div class="dropload-update"><img class="drop-up-icon" src="../images/dropload_up.png"><span>釋放更新</span></div>',    domLoad: '<div class="dropload-load"><img class="loading-icon" src="../images/droploading.gif"></div>'   },   domDown: {    domClass: 'dropload-down',    domRefresh: '<div class="dropload-refresh"><img class="drop-up-icon" src="../images/dropload_up.png"><span>上拉加載更多</span></div>',    domLoad: '<div class="dropload-load"><img class="loading-icon" src="../images/droploading.gif"></div>',    domNoData: ''     //domNoData : '<div class="dropload-noData"><span>暫無(wú)數(shù)據(jù)</span></div>'   },   distance: 50, // 拉動(dòng)距離   threshold: '', // 提前加載距離   loadUpFn: '', // 上方function   loadDownFn: '' // 下方function  }, options);  if (me.opts.loadDownFn != '') {   me.$element.append('<div class="' + me.opts.domDown.domClass + '">' + me.opts.domDown.domRefresh + '</div>');   me.$domDown = $('.' + me.opts.domDown.domClass);  }  if (me.opts.scrollArea == win) {   me.$scrollArea = $win;   me._scrollContentHeight = $doc.height();   me._scrollWindowHeight = doc.documentElement.clientHeight;  } else {   me.$scrollArea = me.opts.scrollArea;   me._scrollContentHeight = me.$element[0].scrollHeight;   me._scrollWindowHeight = me.$element.height();  }  $win.on('resize', function() {   if (me.opts.scrollArea == win) {    me._scrollWindowHeight = win.innerHeight;   } else {    me._scrollWindowHeight = me.$element.height();   }  });  me.$element.on('touchstart', function(e) {   if (!me.loading) {    fnTouches(e);    fnTouchstart(e, me);   }  });  me.$element.on('touchmove', function(e) {   if (!me.loading) {    fnTouches(e, me);    fnTouchmove(e, me);   }  });  me.$element.on('touchend', function() {   if (!me.loading) {    fnTouchend(me);   }  });  me.$scrollArea.on('scroll', function() {   me._scrollTop = me.$scrollArea.scrollTop();   fnRecoverContentHeight(me)   if (me.opts.threshold === '') {    me._threshold = Math.floor(me.$domDown.height() * 1 / 3);   } else {    me._threshold = me.opts.threshold;   }   if (me.opts.loadDownFn != '' && !me.loading && !me.isLockDown && me._threshold != 0 && (me._scrollContentHeight - me._threshold) <= (me._scrollWindowHeight + me._scrollTop)) {    fnLoadDown();   }  });  function fnLoadDown() {   me.direction = 'up';   me.$domDown.html(me.opts.domDown.domLoad);   me.loading = true;   me.opts.loadDownFn(me);  } }; function fnTouches(e) {  if (!e.touches) {   e.touches = e.originalEvent.touches;  } } function fnTouchstart(e, me) {  me._startY = e.touches[0].pageY;  me.touchScrollTop = me.$scrollArea.scrollTop(); } function fnTouchmove(e, me) {  me._curY = e.touches[0].pageY;  me._moveY = me._curY - me._startY;  if (me._moveY > 0) {   me.direction = 'down';  } else if (me._moveY < 0) {   me.direction = 'up';  }  var _absMoveY = Math.abs(me._moveY);  if (me.opts.loadUpFn != '' && me.touchScrollTop <= 0 && me.direction == 'down' && !me.isLockUp) {   e.preventDefault();   me.$domUp = $('.' + me.opts.domUp.domClass);   if (!me.upInsertDOM) {    me.$element.prepend('<div class="' + me.opts.domUp.domClass + '"></div>');    me.upInsertDOM = true;   }   fnTransition(me.$domUp, 0);   if (_absMoveY <= me.opts.distance) {    me._offsetY = _absMoveY;    me.$domUp.html(me.opts.domUp.domRefresh);   } else if (_absMoveY > me.opts.distance && _absMoveY <= me.opts.distance * 2) {    me._offsetY = me.opts.distance + (_absMoveY - me.opts.distance) * 0.5;    me.$domUp.html(me.opts.domUp.domUpdate);   } else {    me._offsetY = me.opts.distance + me.opts.distance * 0.5 + (_absMoveY - me.opts.distance * 2) * 0.2;   }   me.$domUp.css({ 'height': me._offsetY });  } } // touchend function fnTouchend(me) {  var _absMoveY = Math.abs(me._moveY);  if (me.opts.loadUpFn != '' && me.touchScrollTop <= 0 && me.direction == 'down' && !me.isLockUp) {   fnTransition(me.$domUp, 300);   if (_absMoveY > me.opts.distance) {    me.$domUp.css({ 'height': me.$domUp.children().height() });    me.$domUp.html(me.opts.domUp.domLoad);    me.loading = true;    me.opts.loadUpFn(me);   } else {    me.$domUp.css({ 'height': '0' }).on('webkitTransitionEnd transitionend', function() {     me.upInsertDOM = false;     $(this).remove();    });   }   me._moveY = 0;  } } // 重新獲取文檔高度 function fnRecoverContentHeight(me) {  if (me.opts.scrollArea == win) {   me._scrollContentHeight = $doc.height();  } else {   me._scrollContentHeight = me.$element[0].scrollHeight;  } } MyDropLoad.prototype.lock = function(direction) {  var me = this;  if (direction === undefined) {   if (me.direction == 'up') {    me.isLockDown = true;   } else if (me.direction == 'down') {    me.isLockUp = true;   } else {    me.isLockUp = true;    me.isLockDown = true;   }  } else if (direction == 'up') {   me.isLockUp = true;  } else if (direction == 'down') {   me.isLockDown = true;  } }; MyDropLoad.prototype.unlock = function() {  var me = this;  me.isLockUp = false;  me.isLockDown = false; }; MyDropLoad.prototype.setHasData = function(ishasData) {  var me = this;  if (ishasData) {   me.isData = true;   me.$domDown.html(me.opts.domDown.domRefresh);   fnRecoverContentHeight(me);  } else {   me.isData = false;   me.$domDown.html(me.opts.domDown.domNoData);   fnRecoverContentHeight(me);  } }; MyDropLoad.prototype.resetload = function() {  var me = this;  if (me.direction == 'down' && me.upInsertDOM) {   me.$domUp.css({ 'height': '0' }).on('webkitTransitionEnd mozTransitionEnd transitionend', function() {    me.loading = false;    me.upInsertDOM = false;    $(this).remove();    fnRecoverContentHeight(me);   });  } else if (me.direction == 'up') {   me.loading = false;   if (me.isData) {    me.$domDown.html(me.opts.domDown.domRefresh);    fnRecoverContentHeight(me);   } else {    me.$domDown.html(me.opts.domDown.domNoData);   }  } }; function fnTransition(dom, num) {  dom.css({   '-webkit-transition': 'all ' + num + 'ms',   'transition': 'all ' + num + 'ms'  }); }})(window.Zepto || window.jQuery); 

CSS:

.dropload-up,.dropload-down { background-color: #F0EFF5; position: relative; height: 0; overflow: hidden;}.dropload-down { height: 50px; border-top: 1px solid #e5e5e5;}.dropload-refresh .drop-up-icon,.dropload-refresh .drop-down-icon,.dropload-update .drop-up-icon,.dropload-update .drop-down-icon { vertical-align: text-bottom; margin-right: 3px; height: 16px; width: 12px;}.dropload-load .loading-icon { vertical-align: middle; height: 20px; width: 20px;}.dropload-refresh span,.dropload-update span { vertical-align: middle; line-height: 18px; font-size: 16px; color: #585858;}.dropload-noData { border-bottom: 1px solid #e5e5e5; background-color: #FFFFFF;}.dropload-noData span { line-height: 18px; font-size: 14px; color: #999999;}.dropload-refresh,.dropload-update,.dropload-load,.dropload-noData { position: absolute; width: 100%; height: 50px; bottom: 0; line-height: 50px; text-align: center;}.dropload-down .dropload-refresh,.dropload-down .dropload-update,.dropload-down .dropload-load { top: 0; bottom: auto;}

以上就是本文的全部?jī)?nèi)容,希望對(duì)大家的學(xué)習(xí)有所幫助,也希望大家多多支持武林網(wǎng)。

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