jQuery實現的上拉重新整理功能元件示例
阿新 • • 發佈:2020-05-03
本文例項講述了jQuery實現的上拉重新整理功能元件。分享給大家供大家參考,具體如下:
技術要點:
1、jQuery的外掛寫法
2、上拉重新整理步驟分解
3、css樣式
jQuery的外掛寫法:
$.fn.pluginName = function() { return this.each(function () { fn(); }) };
上拉重新整理步驟分解:
上拉重新整理可以分解成三個部分:一是開始(start),記錄當前滑鼠的位置;二是移動(move),根據下拉的位移響應不同的檢視;三是結束(end),重新整理頁面。
;!function ($) { "use strict"; var PTR = function (ele) { this.container = $(ele); this.container.addClass('pull-to-refresh'); this.distance = 60; // 設定參考的下拉位移 this.attachEvent(); }; // 判斷是否有touch事件發生 var isTouch = (function () { var isSupportTouch = !!'ontouchstart' in document || window.documentTouch; return isSupportTouch; })(); var touchEvents = { start: isTouch ? 'touchstart': 'mousedown',move: isTouch ? 'touchmove':'mousemove',end: isTouch ? 'touchend': 'mouseup' }; // 獲取事件發生時相對於文件的距離(含滾動距離) function getTouchPosition(e) { var e = e.orinalEvent || e; console.log(e) if(e.type === 'touchstart' || e.type === 'touchmove' || e.type === 'touchend') { return { x: e.targetTouches[0].pageX,y: e.targetTouches[0].pageY } }else { return { x: e.pageX,y: e.pageY } } }; PTR.prototype.touchStart = function (e) { var p = getTouchPosition(e); this.start = p; this.diffX = this.diffY = 0; }; PTR.prototype.touchMove = function (e) { if(this.container.hasClass('refreshing')) return; if(!this.start) return false; var p = getTouchPosition(e); this.diffX = p.x - this.start.x; this.diffY = p.y - this.start.y; if(this.diffY < 0) return; this.container.addClass('touching'); e.preventDefault(); e.stopPropagation(); // 設定container的位移小於頁面滾動的距離,給人一種用力下拉的錯覺,提升使用者體驗 this.diffY = Math.pow(this.diffY,.8); this.container.css('transform','translate3d(0,'+ this.diffY +'px,0)'); if(this.diffY < this.distance) { this.container.removeClass('pull-up').addClass('pull-down') }else { this.container.removeClass('pull-down').addClass('pull-up') } }; PTR.prototype.touchEnd = function (e) { var _this = this; this.start = false; this.container.removeClass('pull-down'); this.container.removeClass('pull-up'); this.container.removeClass('touching'); this.container.css('transform',''); if(this.diffY >= this.distance) { this.container.addClass('refreshing'); this.container.trigger('pull-to-refresh') } }; // 事件處理程式,通過$.proxy(fn,content)繫結執行函式的上下文。 PTR.prototype.attachEvent = function () { var ele = this.container; ele.on(touchEvents.start,$.proxy(this.touchStart,this)); ele.on(touchEvents.move,$.proxy(this.touchMove,this)); ele.on(touchEvents.end,$.proxy(this.touchEnd,this)); }; // 例項化建構函式 var pullToRefresh = function (ele) { new PTR(ele) }; var pullToRefreshDone = function (ele) { $(ele).removeClass('refreshing'); }; // jQuery 外掛編寫的一般模式 $.fn.pullToRefresh = function () { // return 是外掛可鏈式呼叫 // this 在這裡是一個jQuery物件,相當於$(ele)。因為在即時執行函式作用域中,沒必要用“$(this)”的方式來把this包裹到一個jQuery物件中,因為this本身已經是被包裝好的jQuery物件。 // this.each()使外掛程式碼為多元素集合中的每個元素單獨起作用 return this.each(function () { pullToRefresh(this); }) }; $.fn.pullToRefreshDone = function () { return this.each(function () { pullToRefreshDone(this); }) } }(window.jQuery);
HTML程式碼如下:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <link rel="stylesheet" href="pull-to-refresh.css" rel="external nofollow" > <style> p { margin-top: 0; } </style> </head> <body> <div class="pull-to-refresh_layer"> <div class="pull-to-refresh-arrow">↓</div> <div class="pull-to-refresh-preloader"></div> <div class="down">下拉重新整理</div> <div class="up">釋放重新整理</div> <div class="refresh">正在重新整理</div> </div> <div> <p>Lorem ipsum dolor sit amet,consectetur adipisicing elit. Accusamus amet aperiam,architecto at aut beatae dignissimos eaque est ex fugi at incidunt inventore natus nemo nostru m omnis quos repellat ut voluptas! </p> <p>Lorem ipsum dolor sit amet,architecto at aut beatae dignissimos eaque est ex fugi at incidunt inventore natus nemo nostru m omnis quos repellat ut voluptas! </p> </div> <script src="../jquery-1.8.3.min.js"></script> <script src="pull-to-refresh.js"></script> <script> $(function () { $(document.body).pullToRefresh().on('pull-to-refresh',function () { setTimeout(function () { $(document.body).pullToRefreshDone(); },2000) }); }) </script> </body> </html>
CSS程式碼如下:
.pull-to-refresh { margin-top: -50px; transition: transform .4s; } .pull-to-refresh .pull-to-refresh-preloader,.pull-to-refresh .up,.pull-to-refresh .refresh { display: none; } .pull-to-refresh.refreshing { transform: translate3d(0,50px,0); } .refreshing .pull-to-refresh-arrow,.refreshing .down,.refreshing .up { display: none; } .refreshing .refresh,.refreshing .pull-to-refresh-preloader { display: inline-block; } .pull-to-refresh_layer { height: 30px; line-height: 30px; padding-bottom: 10px; } .pull-down .pull-to-refresh_layer .up,.pull-down .pull-to-refresh_layer .refresh { display: none; } .pull-down .pull-to-refresh_layer .down{ display: inline-block; } .pull-up .pull-to-refresh_layer .up{ display: inline-block; } .pull-up .pull-to-refresh_layer .down,.pull-up .pull-to-refresh_layer .refresh { display: none; } .pull-up .pull-to-refresh-arrow { transform: rotate(180deg) translate3d(0,0); } .pull-to-refresh-arrow { display: inline-block; z-index: 10; margin-right: 4px; transition-duration: 300ms; transform: rotate(0deg) translate3d(0,0); } .pull-to-refresh_layer { display: inline-block; } .pull-to-refresh-preloader { display: inline-block; } .pull-down { } .pull-up { } .down { display: inline-block; } .up { display: inline-block; } .refresh { display: inline-block; }
感興趣的朋友可以使用線上HTML/CSS/JavaScript程式碼執行工具 http://tools.jb51.net/code/HtmlJsRun 測試上述程式碼執行效果。
更多關於jQuery相關內容感興趣的讀者可檢視本站專題:《jQuery頁面元素操作技巧彙總》、《jQuery常見事件用法與技巧總結》、《jQuery常用外掛及用法總結》、《jQuery擴充套件技巧總結》及《jquery選擇器用法總結》
希望本文所述對大家jQuery程式設計有所幫助。