JQuery plug in iScroll to achieve drop down refresh scroll page effects

  • 2020-03-30 03:23:57
  • OfStack

JQuery plugin: iScroll

Page layout:


<div id="wrapper">
  <div id="scroller">
   <div id="pullDown">
    <span class="pullDownIcon"></span><span class="pullDownLabel"> The drop-down refresh ...</span>
   </div>
   <ul id="thelist">
    <li>
     <img src="img/page1_img1.jpg" />
    </li>
    <li>
     <img src="img/page1_img2.jpg" />
    </li>
    <li>
     <img src="img/page1_img3.jpg" />
    </li>
    <li>
     <img src="img/page1_img1.jpg" />
    </li>
    <li>
     <img src="img/page1_img2.jpg" />
    </li>
    <li>
     <img src="img/page1_img3.jpg" />
    </li>
   </ul>
   <div id="pullUp">
    <span class="pullUpIcon"></span><span class="pullUpLabel"> Pull up loads more ...</span>
   </div>
  </div>

Page-turning is an ajax request that passes the page number to the general handler, where the paged data is returned to the json array object.

Pull-down refresh:


/**
  *  The drop-down refresh   (custom implementation of this method) 
  * myScroll.refresh(); //When the data is loaded, the interface update method is called
  */
  function pullDownAction() {
   setTimeout(function () { 
    var el, li, i;
    el = document.getElementById('thelist');
    //==========================================
    $.ajax({
     type: "GET",
     url: "LoadMore.ashx",
     data: { page: generatedCount },
     dataType: "json",
     success: function (data) {
      var json = data;
      $(json).each(function () {
       li = document.createElement('li');
       // li.innerText = 'Generated row ' + (++generatedCount);
       li.innerHTML = '<img src="' + this.src + '"/>';
       el.insertBefore(li, el.childNodes[0]);
      })
     }
    });
    myScroll.refresh(); //After the data is loaded, call the interface update method Remember to refresh when contents are loaded (ie: on ajax completion)
   }, 1000);  // <-- Simulate network congestion, remove setTimeout from production!
  }

The pull to refresh


function pullUpAction() {
   setTimeout(function () {  
    var el, li, i;
    el = document.getElementById('thelist');
    //==========================================
    $.ajax({
     type: "GET",
     url: "LoadMore.ashx",
     data: { page: generatedCount },
     dataType: "json",
     success: function (data) {
      var json = data;
      $(json).each(function () {
       li = document.createElement('li');
       //  li.innerText = 'Generated row ' + (++generatedCount);
       li.innerHTML = '<img src="' + this.src + '"/>;     
       el.insertBefore(li, el.childNodes[0]);
      })
     }
    });
    //============================================
    myScroll.refresh(); //After the data is loaded, call the interface update method Remember to refresh when contents are loaded (ie: on ajax completion)
   }, 1000); // <-- Simulate network congestion, remove setTimeout from production!
  }

Initialize the



  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 = ' The drop-down refresh ...';
     } else if (pullUpEl.className.match('loading')) {
      pullUpEl.className = '';
      pullUpEl.querySelector('.pullUpLabel').innerHTML = ' Pull up loads more ...';
     }
    },
    onScrollMove: function () {
     if (this.y > 5 && !pullDownEl.className.match('flip')) {
      pullDownEl.className = 'flip';
      pullDownEl.querySelector('.pullDownLabel').innerHTML = ' Let go of the update ...';
      this.minScrollY = 0;
     } else if (this.y < 5 && pullDownEl.className.match('flip')) {
      pullDownEl.className = '';
      pullDownEl.querySelector('.pullDownLabel').innerHTML = ' The drop-down refresh ...';
      this.minScrollY = -pullDownOffset;
     } else if (this.y < (this.maxScrollY - 5) && !pullUpEl.className.match('flip')) {
      pullUpEl.className = 'flip';
      pullUpEl.querySelector('.pullUpLabel').innerHTML = ' Let go of the update ...';
      this.maxScrollY = this.maxScrollY;
     } else if (this.y > (this.maxScrollY + 5) && pullUpEl.className.match('flip')) {
      pullUpEl.className = '';
      pullUpEl.querySelector('.pullUpLabel').innerHTML = ' Pull up loads more ...';
      this.maxScrollY = pullUpOffset;
     }
    },
    onScrollEnd: function () {
     if (pullDownEl.className.match('flip')) {
      pullDownEl.className = 'loading';
      pullDownEl.querySelector('.pullDownLabel').innerHTML = ' In the load ...';
      pullDownAction(); // Execute custom function (ajax call?)
     } else if (pullUpEl.className.match('flip')) {
      pullUpEl.className = 'loading';
      pullUpEl.querySelector('.pullUpLabel').innerHTML = ' In the load ...';
      pullUpAction(); // Execute custom function (ajax call?)
     }
    }
   });
   setTimeout(function () { document.getElementById('wrapper').style.left = '0'; }, 800);
  }
  //Initializes the bound iScroll control
  document.addEventListener('touchmove', function (e) { e.preventDefault(); }, false);
  document.addEventListener('DOMContentLoaded', loaded, false);


Related articles: