手機圖片滑動切換,網上有很多這樣的例子,但都借助於其他組件,讓代碼混亂的不行;還有就是用到css3裡的 transform:translate(x,y);移動元素,不過發現在不支持css3的設備上馬上完蛋了,所 有下定決心自己做一個,誰知出現了很多的問題,其中最重要的是給圖片加鏈接,網頁中的上下滾動條不能在拖動圖片的時候滾動,並且不能兼容pc機器上的拖動;在這裡就簡單介紹一下遇到的問題和解決的方法;
問題一:給圖片加上鏈接後,在拖動的時候總是跳到其他頁面;
問題根源主要是不能判斷是點擊還是拖動,手機事件一般順序是 touchstart-》mousedown-》mousemove-》touchmove-》mouseup-》touchend-》click,根據不同手機可能會有不同。觸屏手機的事件一般都用 touchstart -》 touchmove -》 touchend -》 click,click事件是最後執行的,當我們有touchstart,touchmove,touchend處理完後,如果不進行return或取消默認就會觸發click事件,這樣網頁就跳走了,解決辦法是記錄touchstart的坐標點和touchmove的坐標點,根據兩個坐標點算出觸點是否移動過,其中值得關注的是事件的Event參數,觸屏一般是 event.touches,event.targetTouches,event.changedTouches。我在測試當中發現者三個參數的值時一樣的,不過值得注意的是touchend事件不會得到觸點坐標(也或許是設備問題),在移動的時候touchmove會不斷出發,有時候touchmove會不觸發,其中就是浏覽器自帶一下功能把觸點(或鼠標)脫離了選中的元素,比如上時間按住會出現菜單,(pc上圖片就會生成一個可以拖動的縮略圖),這樣就要在touchstart(mousedown)的時候先 event.preventDefault();取消默認。
問題二:網頁中的上下滾動條不能在拖動圖片的時候滾動;
相信這個問題只要制作過得都會遇到,其實主要是在移動(touchmove,mousemove)的時候取消了默認事件event.preventDefault(),在這裡我們需要做的是,是否移動獲得觸點和開始的觸點是否一致,如果一致就直接返回,還要算出是移動的x軸多一點還是y軸移動的多一點,這樣我們就可以做左右滑動的時候取消默認,在上學的時候不取消;
問題三: 並且不能兼容pc機器上的拖動
這是因為在綁定事件的時候不能完全考慮事件名稱是touchstart還是mousedown ,從網上搜了一下,感覺做的不做,就直接抄過來了
this.eventName={ touchstart:'touchstart', touchmove:'touchmove', touchend:'touchend', }
在做判斷
if(!device){ this.eventName.touchstart='mousedown'; this.eventName.touchmove='mousemove'; this.eventName.touchend='mouseup'; }
dom.addEventListener(this.eventName.touchstart,handleEvent,false);
大概是這個意思,根據設備不同綁定不同的事件
其實還碰到了很多的問題,就不一一說明了
不多說了,直接把代碼貼出來了,如果有什麼不太好的地方,還請多多包含和提出意見
<!doctype html> <html> <head> <meta charset="utf-8"> <meta content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" name="viewport" /> <meta content="yes" name="apple-mobile-web-app-capable" /> <meta content="black" name="apple-mobile-web-app-status-bar-style" /> <meta content="telephone=no" name="format-detection" /> <title></title> <style type="text/css"> html,body,*{ margin: 0; padding: 0; border: 0;} #wapListImage1, #wapListImage{width: 100%; overflow: hidden; height: auto; cursor: move; zoom:1; position: relative;} #wapListImage1 ul, #wapListImage1 ul li, #wapListImage1 ul, #wapListImage ul li{ list-style: none;} #wapListImage1 ul, #wapListImage ul{width: 99999px;} #wapListImage1 ul li, #wapListImage ul li{ float: left;} #wapListImage ul li a img:focus, #wapListImage ul li a img:checked, #wapListImage ul li a img, #wapListImage ul li a img:active, #wapListImage ul li a,#wapListImage ul li a:active{cursor: move;} #wapListImage dl{ position: absolute; bottom: 10px; 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}else if(lib.point.pageX2-lib.point.pageX1>0){ // console.log("===") lib.Event.prev.call(this,lib); } }, domUpdate: function(lib,type){ if(lib.page.isdom) return; lib.page.isdom=true; if(!lib.options.isfor){ var index = lib.page.liList[lib.page.index].getAttribute('index'); lib.options.callBack({"index":parseInt(index)+1}); lib.page.isdom=false; return; } if(type=='l'){ lib.page.domUL.insertBefore(lib.page.liList[lib.page.liList.length-1],lib.page.liList[0]); lib.page.domUL.style.marginLeft=-lib.page.bodyWidth+'px';//(parseFloat(lib.page.domUL.style.marginLeft)-lib.page.bodyWidth)+'px'; //lib.page.index++; }else if(type=='r'){ lib.page.domUL.appendChild(lib.page.liList[0]); lib.page.domUL.style.marginLeft=-lib.page.bodyWidth+'px';//(parseFloat(lib.page.domUL.style.marginLeft)+lib.page.bodyWidth)+'px'; //lib.page.index--; } lib.page.index=1; // console.log(lib.page.index) var index = lib.page.liList[lib.page.index].getAttribute('index'); lib.options.callBack({"index":parseInt(index)+1}); lib.page.isdom=false; } }; }; WapImage.prototype = { setoption: function(arg){ for(var i in this.options){ this.options[i]= arg[i] !== undefined ? arg[i] : this.options[i]; } if(!device){ this.eventName.touchstart='mousedown'; this.eventName.touchmove='mousemove'; this.eventName.touchend='mouseup'; } //return temp; }, bindEvent: function(){ var lib = this; this.page.domUL.addEventListener(this.eventName.touchstart,function(event){lib.Event.handleEvent.call(lib,event,lib);},false); w.addEventListener(this.eventName.touchmove,function(event){lib.Event.handleEvent.call(lib,event,lib);},false); w.addEventListener(this.eventName.touchend,function(event){lib.Event.handleEvent.call(lib,event,lib);},false); w.addEventListener('resize',function(){lib.init();},false); }, init:function(){ this.page.bodyWidth=document.body.clientWidth; this.page.liList= this.options.dom.getElementsByTagName('li'); this.page.domUL = this.options.dom.getElementsByTagName('ul')[0]; this.options.dom.style.width=this.page.bodyWidth+'px'; for(var i=0;i<this.page.liList.length;i++){ var item = this.page.liList[i]; var img = item.getElementsByTagName('img')[0]; item.setAttribute('index',i); item.style.width=this.page.bodyWidth+'px'; img.style.width = this.page.bodyWidth+'px'; } if(this.page.liList.length<3){ var length = this.page.liList.length; if(length==1){ this.page.domUL.appendChild(this.page.liList[0].cloneNode(true)); this.page.domUL.appendChild(this.page.liList[0].cloneNode(true)); }else{ for(var i=0;i<length;i++){ this.page.domUL.appendChild(this.page.liList[i].cloneNode(true)); } } this.page.liList= this.options.dom.getElementsByTagName('li'); } }, position:function(index){ this.Event.position.call(this,this,index); }, next:function(){ this.Event.next.call(this,this); }, prev:function(){ this.Event.prev.call(this,this); }, start: function(arg){ this.setoption(arg); this.init(); this.position(); this.bindEvent(); this.Event.domUpdate(this,'l'); this.Event.start(this); } }; var loaded=function(){ w.WapImage=new WapImage(); w.WapImages=new WapImage(); }; (function(){ if(d.body){ loaded(); }else{ if(d.addEventListener){ d.addEventListener( 'DOMContentLoaded', function(){ d.removeEventListener( 'DOMContentLoaded', arguments.callee, false ); loaded(); }, false ); }else if(d.attachEvent){ d.attachEvent( 'onreadystatechange', function(){ if( d.readyState === 'complete' ){ d.detachEvent( 'onreadystatechange', arguments.callee ); loaded(); } }); } } })(); })(window,document,undefined); window.onload = function(){ var obj = { dom:document.getElementById('wapListImage'), isupdate:true, time:3000, isfor:true, leftOrright:'left', callBack:function(obj){ var span = document.getElementById('wapListImage').getElementsByTagName('dl')[0].getElementsByTagName('span'); for(var k = 0;k<span.length;k++){ span[k].className=''; } span[obj.index-1].className='selected' // console.log(obj.index) } }; WapImage.start(obj); WapImage.position(2) var obj2 = { dom:document.getElementById('wapListImage1'), callBack:function(obj){ // console.log(obj.index) } }; WapImages.start(obj2); // var img = new w.WapImage(); // img.start(obj); } </script> </body> </html>
用法:
在頁面加載完成後
var obj = { dom:document.getElementById('wapListImage'),//dom元素 isupdate:true,//是否自動切換 time:3000,//自動切換的時間毫秒 isfor:true, //是否循環播放,即到最後一張是否直接轉入第一張,或到第一張直接轉入最後一張 leftOrright:'left',//像左側自動切換還是像右側自動切換 callBack:function(obj){//切換成功後回調函數 其實有index參數為當前第幾張圖片 //自己處理 var span = document.getElementById('wapListImage').getElementsByTagName('dl')[0].getElementsByTagName('span'); for(var k = 0;k<span.length;k++){ span[k].className=''; } span[obj.index-1].className='selected' // console.log(obj.index) } }; WapImage.start(obj); WapImage.position(2)
如果一個也沒需要多個圖片切換效果可以再代碼中查找 var loaded=function()
在其中定義您需要個切換圖片個數,並定出名字
如
w.WapImage=new WapImage();
w.WapImages=new WapImage();
在頁面加載完後就可以直接調用
WapImage.start()和WapImages.start()