引用iScroll.js實現上拉和下拖刷新

使用技巧javascript

      一、引用iScroll.js, 在初始化時添加兩個事件監聽:touchMove、DOMContentLoaded。java

      二、實現iScroll插件的onScrollEnd事件, 也就是在這個事件裏調用你本身的ajax方法實現數據的刷新和追加。ajax

      三、上拉加載更多請求後臺時就至關於分頁請求數據,這時候須要在ajax請求時發送pageIndex參數,而初始化加載時須要從後臺返回一個pageCount以便前臺判斷。app

      四、最關鍵的就是實現下拉刷新方法(pullDownAction)和上拉加載更多(pullUpAction)方法。post

效果圖this

 實現方法spa

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var      myScroll,
     pullDownEl, pullDownOffset,
     pullUpEl, pullUpOffset,
     generatedCount = 0;
 
/**
  * 下拉刷新 (自定義實現此方法)
  * myScroll.refresh(); 數據加載完成後,調用界面更新方法
  */
function  pullDownAction () {
     setTimeout( function  () {   
         var  el, li, i;
         el = document.getElementById( 'thelist' );
 
         for  (i=0; i<3; i++) {
             li = document.createElement( 'li' );
             li.innerText =  'Generated row '  + (++generatedCount);
             el.insertBefore(li, el.childNodes[0]);
         }
         
         myScroll.refresh();      //數據加載完成後,調用界面更新方法 
     }, 1000);  
}
 
/**
  * 滾動翻頁 (自定義實現此方法)
  * myScroll.refresh();      // 數據加載完成後,調用界面更新方法
  */
function  pullUpAction () {
     setTimeout( function  () {     // <-- Simulate network congestion, remove setTimeout from production!
         var  el, li, i;
         el = document.getElementById( 'thelist' );
 
         for  (i=0; i<3; i++) {
             li = document.createElement( 'li' );
             li.innerText =  'Generated row '  + (++generatedCount);
             el.appendChild(li, el.childNodes[0]);
         }
         
         myScroll.refresh();      //數據加載完成後,調用界面更新方法
     }, 1000);  
}
 
/**
  * 初始化iScroll控件
  */
function  loaded() {
     pullDownEl = document.getElementById( 'pullDown' );
     pullDownOffset = pullDownEl.offsetHeight;
     pullUpEl = document.getElementById( 'pullUp' );  
     pullUpOffset = pullUpEl.offsetHeight;
     
     myScroll =  new  iScroll( 'wrapper' , {
         scrollbarClass:  'myScrollbar' ,
         useTransition:  false ,
         topOffset: pullDownOffset,
         onRefresh:  function  () {
             if  (pullDownEl.className.match( 'loading' )) {
                 pullDownEl.className =  '' ;
                 pullDownEl.querySelector( '.pullDownLabel' ).innerHTML =  '下拉刷新...' ;
             else  if  (pullUpEl.className.match( 'loading' )) {
                 pullUpEl.className =  '' ;
                 pullUpEl.querySelector( '.pullUpLabel' ).innerHTML =  '上拉加載更多...' ;
             }
         },
         onScrollMove:  function  () {
             if  ( this .y > 5 && !pullDownEl.className.match( 'flip' )) {
                 pullDownEl.className =  'flip' ;
                 pullDownEl.querySelector( '.pullDownLabel' ).innerHTML =  '鬆手開始更新...' ;
                 this .minScrollY = 0;
             else  if  ( this .y < 5 && pullDownEl.className.match( 'flip' )) {
                 pullDownEl.className =  '' ;
                 pullDownEl.querySelector( '.pullDownLabel' ).innerHTML =  '下拉刷新...' ;
                 this .minScrollY = -pullDownOffset;
             else  if  ( this .y < ( this .maxScrollY - 5) && !pullUpEl.className.match( 'flip' )) {
                 pullUpEl.className =  'flip' ;
                 pullUpEl.querySelector( '.pullUpLabel' ).innerHTML =  '鬆手開始更新...' ;
                 this .maxScrollY =  this .maxScrollY;
             else  if  ( this .y > ( this .maxScrollY + 5) && pullUpEl.className.match( 'flip' )) {
                 pullUpEl.className =  '' ;
                 pullUpEl.querySelector( '.pullUpLabel' ).innerHTML =  '上拉加載更多...' ;
                 this .maxScrollY = pullUpOffset;
             }
         },
         onScrollEnd:  function  () {
             if  (pullDownEl.className.match( 'flip' )) {
                 pullDownEl.className =  'loading' ;
                 pullDownEl.querySelector( '.pullDownLabel' ).innerHTML =  '加載中...' ;               
                 pullDownAction();    // ajax call
             else  if  (pullUpEl.className.match( 'flip' )) {
                 pullUpEl.className =  'loading' ;
                 pullUpEl.querySelector( '.pullUpLabel' ).innerHTML =  '加載中...' ;               
                 pullUpAction();  // ajax call
             }
         }
     });
     
     setTimeout( function  () { document.getElementById( 'wrapper' ).style.left =  '0' ; }, 800);
}
 
//初始化綁定iScroll控件
document.addEventListener( 'touchmove' function  (e) { e.preventDefault(); },  false );
document.addEventListener( 'DOMContentLoaded' , loaded,  false );
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