dropload.js plug-in pull-down refresh and pull-up loading methods

This article mainly introduces the use of dropload.js plug-in pull-down refresh and pull-up loading in detail. It has certain reference value. Interested friends can refer to it. I hope it can help everyone.

The first step, download the dropload plug-in, the dropload plug-in download address official document: https://github.com/ximan/dropload
The second step , introduce the dropload.css and dropload.min.js files in the downloaded dropload plug-in into the page. Be careful to also introduce Jquery1.7 or above or Zepto. Choose one. Do not quote them both at the same time, because dropload is implemented based on jquery.
The third step, put the following code at the bottom of the page, pay attention to the bottom, otherwise the dropload plug-in will not be able to obtain the height

**基本代码结构**
//#content为某个p的id 
var dropload = $('#content').dropload({ 
//scrollArea很关键，要不然加载更多不起作用 
scrollArea : window, 
domUp : { 
 domClass : 'dropload-up', 
 domRefresh : &#39;<p class="dropload-refresh">↓下拉刷新</p>&#39;, 
 domUpdate : &#39;<p class="dropload-update">↑释放更新</p>&#39;, 
 domLoad : &#39;<p class="dropload-load"><span class="loading"></span>加载中...</p>&#39; 
}, 
domDown : { 
 domClass : &#39;dropload-down&#39;, 
 domRefresh : &#39;<p class="dropload-refresh">↑上拉加载更多</p>&#39;, 
 domLoad : &#39;<p class="dropload-load"><span class="loading"></span>加载中...</p>&#39;, 
 domNoData : &#39;<p class="dropload-noData">暂无数据</p>&#39; 
 }, 
loadUpFn : function(me){ 
 //下拉刷新需要调用的函数 
 alert("下拉刷新需要调用的函数"); 
 //重置下拉刷新 
 me.resetload(); 
}, 
loadDownFn : function(me){ 
 //上拉加载更多需要调用的函数 
 alert("上拉加载更多需要调用的函数"); 
 //定时器函数,为了看出上拉加载更多效果 
  setTimeout(function(){ 
  // 每次数据加载完，必须重置 
   me.resetload(); 
  },1000); 
  } 
});

Just view some complete examples on demand

Example one, Load bottom

<script>
$(function(){
 // 页数
 var page = 0;
 // 每页展示5个
 var size = 5;

 // dropload调用
 $(&#39;.content&#39;).dropload({
 scrollArea : window,
 loadDownFn : function(me){
  page++;
  // 拼接HTML
  var result = &#39;&#39;;
  $.ajax({
  type: &#39;GET&#39;,
  url: &#39;http://ons.me/tools/dropload/json.php?page=&#39;+page+&#39;&size=&#39;+size,//配合后台接口
  dataType: &#39;json&#39;,
  success: function(data){
   var arrLen = data.length;
   if(arrLen > 0){
   for(var i=0; i<arrLen; i++){
    result += &#39;<a class="item opacity" href="&#39;+data[i].link+&#39;">&#39;
      +&#39;<img src="&#39;+data[i].pic+&#39;" alt="">&#39;
      +&#39;<h3>&#39;+data[i].title+&#39;</h3>&#39;
      +&#39;<span class="date">&#39;+data[i].date+&#39;</span>&#39;
     +&#39;</a>&#39;;
   }
   // 如果没有数据
   }else{
   // 锁定
   me.lock();
   // 无数据
   me.noData();
   }
   // 为了测试，延迟1秒加载
   setTimeout(function(){
   // 插入数据到页面，放到最后面
   $(&#39;.lists&#39;).append(result);
   // 每次数据插入，必须重置
   me.resetload();
   },1000);
  },
  error: function(xhr, type){
   alert(&#39;Ajax error!&#39;);
   // 即使加载出错，也得重置
   me.resetload();
  }
  });
 }
 });
});
</script>

Example two, Load top, bottom

<script>
$(function(){
 // 页数
 var page = 0;
 // 每页展示10个
 var size = 10;

 // dropload
 $(&#39;.content&#39;).dropload({
 scrollArea : window,
 domUp : {
  domClass : &#39;dropload-up&#39;,
  domRefresh : &#39;<p class="dropload-refresh">↓下拉刷新-自定义内容</p>&#39;,
  domUpdate : &#39;<p class="dropload-update">↑释放更新-自定义内容</p>&#39;,
  domLoad : &#39;<p class="dropload-load"><span class="loading"></span>加载中-自定义内容...</p>&#39;
 },
 domDown : {
  domClass : &#39;dropload-down&#39;,
  domRefresh : &#39;<p class="dropload-refresh">↑上拉加载更多-自定义内容</p>&#39;,
  domLoad : &#39;<p class="dropload-load"><span class="loading"></span>加载中-自定义内容...</p>&#39;,
  domNoData : &#39;<p class="dropload-noData">暂无数据-自定义内容</p>&#39;
 },
 loadUpFn : function(me){
  $.ajax({
  type: &#39;GET&#39;,
  url: &#39;json/update.json&#39;,
  dataType: &#39;json&#39;,
  success: function(data){
   var result = &#39;&#39;;
   for(var i = 0; i < data.lists.length; i++){
   result += &#39;<a class="item opacity" href="&#39;+data.lists[i].link+&#39;">&#39;
     +&#39;<img src="&#39;+data.lists[i].pic+&#39;" alt="">&#39;
     +&#39;<h3>&#39;+data.lists[i].title+&#39;</h3>&#39;
     +&#39;<span class="date">&#39;+data.lists[i].date+&#39;</span>&#39;
     +&#39;</a>&#39;;
   }
   // 为了测试，延迟1秒加载
   setTimeout(function(){
   $(&#39;.lists&#39;).html(result);
   // 每次数据加载完，必须重置
   me.resetload();
   // 重置页数，重新获取loadDownFn的数据
   page = 0;
   // 解锁loadDownFn里锁定的情况
   me.unlock();
   me.noData(false);
   },1000);
  },
  error: function(xhr, type){
   alert(&#39;Ajax error!&#39;);
   // 即使加载出错，也得重置
   me.resetload();
  }
  });
 },
 loadDownFn : function(me){
  page++;
  // 拼接HTML
  var result = &#39;&#39;;
  $.ajax({
  type: &#39;GET&#39;,
  url: &#39;http://ons.me/tools/dropload/json.php?page=&#39;+page+&#39;&size=&#39;+size,
  dataType: &#39;json&#39;,
  success: function(data){
   var arrLen = data.length;
   if(arrLen > 0){
   for(var i=0; i<arrLen; i++){
    result += &#39;<a class="item opacity" href="&#39;+data[i].link+&#39;">&#39;
      +&#39;<img src="&#39;+data[i].pic+&#39;" alt="">&#39;
      +&#39;<h3>&#39;+data[i].title+&#39;</h3>&#39;
      +&#39;<span class="date">&#39;+data[i].date+&#39;</span>&#39;
     +&#39;</a>&#39;;
   }
   // 如果没有数据
   }else{
   // 锁定
   me.lock();
   // 无数据
   me.noData();
   }
   // 为了测试，延迟1秒加载
   setTimeout(function(){
   // 插入数据到页面，放到最后面
   $(&#39;.lists&#39;).append(result);
   // 每次数据插入，必须重置
   me.resetload();
   },1000);
  },
  error: function(xhr, type){
   alert(&#39;Ajax error!&#39;);
   // 即使加载出错，也得重置
   me.resetload();
  }
  });
 },
 threshold : 50
 });
});
</script>

Example three, Load multiple times

$(function(){
 //利用此写法，可以限制多次加载的个数。
 var timer;

 $('.header .ipt').on('input',function(){
 var _length = $(this).val();
 // 如果输入值不是数字或者是空，就跳出
 if(isNaN(_length) || _length === ''){
  return false;
 }
 clearTimeout(timer);
 timer = setTimeout(function(){//也可不用定时器
  // 清空内容
  $('.lists').html('');
  $('.dropload-down').remove();

  var counter = 0;
  // 每页展示4个
  var num = 4;
  var pageStart = 0,pageEnd = 0;
  // dropload
  $('.content').dropload({
  scrollArea : window,
  loadDownFn : function(me){
   $.ajax({
   type: 'GET',
   url: 'json/more.json',
   dataType: 'json',
   success: function(data){
    var result = '';
    counter++;
    pageEnd = num * counter;
    pageStart = pageEnd - num;

    for(var i = pageStart; i < pageEnd; i++){
    result += &#39;<a class="item opacity" href="&#39;+data.lists[i].link+&#39;">&#39;
      +&#39;<img src="&#39;+data.lists[i].pic+&#39;" alt="">&#39;
      +&#39;<h3>&#39;+data.lists[i].title+&#39;</h3>&#39;
      +&#39;<span class="date">&#39;+data.lists[i].date+&#39;</span>&#39;
      +&#39;</a>&#39;;
    if((i + 1) >= _length || (i + 1) >= data.lists.length){
     // 锁定
     me.lock();
     // 无数据
     me.noData();
     break;
    }
    }
    // 为了测试，延迟1秒加载
    setTimeout(function(){
    $(&#39;.lists&#39;).append(result);
    // 每次数据加载完，必须重置
    me.resetload();
    },1000);
   },
   error: function(xhr, type){
    alert(&#39;Ajax error!&#39;);
    // 即使加载出错，也得重置
    me.resetload();
   }
   });
  }
  });
 },500);
 });

Example 4, Fixed layout, load top and bottom

$(function(){
 // 按钮操作
 $('.header .btn').on('click',function(){
 var $this = $(this);
 if(!!$this.hasClass('lock')){
  $this.attr('class','btn unlock');
  $this.text('解锁');
  // 锁定
  dropload.lock();
  $('.dropload-down').hide();
 }else{
  $this.attr('class','btn lock');
  $this.text('锁定');
  // 解锁
  dropload.unlock();
  $('.dropload-down').show();
 }
 });

 // dropload
 var dropload = $('.inner').dropload({
 domUp : {
  domClass : 'dropload-up',
  domRefresh : &#39;<p class="dropload-refresh">↓下拉刷新</p>&#39;,
  domUpdate : &#39;<p class="dropload-update">↑释放更新</p>&#39;,
  domLoad : &#39;<p class="dropload-load"><span class="loading"></span>加载中...</p>&#39;
 },
 domDown : {
  domClass : &#39;dropload-down&#39;,
  domRefresh : &#39;<p class="dropload-refresh">↑上拉加载更多</p>&#39;,
  domLoad : &#39;<p class="dropload-load"><span class="loading"></span>加载中...</p>&#39;,
  domNoData : &#39;<p class="dropload-noData">暂无数据</p>&#39;
 },
 loadUpFn : function(me){
  $.ajax({
  type: &#39;GET&#39;,
  url: &#39;json/update.json&#39;,
  dataType: &#39;json&#39;,
  success: function(data){
   var result = &#39;&#39;;
   for(var i = 0; i < data.lists.length; i++){
   result += &#39;<a class="item opacity" href="&#39;+data.lists[i].link+&#39;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >&#39;
     +&#39;<img src="&#39;+data.lists[i].pic+&#39;" alt="">&#39;
     +&#39;<h3>&#39;+data.lists[i].title+&#39;</h3>&#39;
     +&#39;<span class="date">&#39;+data.lists[i].date+&#39;</span>&#39;
     +&#39;</a>&#39;;
   }
   // 为了测试，延迟1秒加载
   setTimeout(function(){
   $(&#39;.lists&#39;).html(result);
   // 每次数据加载完，必须重置
   dropload.resetload();
   },1000);
  },
  error: function(xhr, type){
   alert(&#39;Ajax error!&#39;);
   // 即使加载出错，也得重置
   dropload.resetload();
  }
  });
 },
 loadDownFn : function(me){
  $.ajax({
  type: &#39;GET&#39;,
  url: &#39;json/more.json&#39;,
  dataType: &#39;json&#39;,
  success: function(data){
   var result = &#39;&#39;;
   for(var i = 0; i < data.lists.length; i++){
   result += &#39;<a class="item opacity" href="&#39;+data.lists[i].link+&#39;">&#39;
     +&#39;<img src="&#39;+data.lists[i].pic+&#39;" alt="">&#39;
     +&#39;<h3>&#39;+data.lists[i].title+&#39;</h3>&#39;
     +&#39;<span class="date">&#39;+data.lists[i].date+&#39;</span>&#39;
     +&#39;</a>&#39;;
   }
   // 为了测试，延迟1秒加载
   setTimeout(function(){
   $(&#39;.lists&#39;).append(result);
   // 每次数据加载完，必须重置
   dropload.resetload();
   },1000);
  },
  error: function(xhr, type){
   alert(&#39;Ajax error!&#39;);
   // 即使加载出错，也得重置
   dropload.resetload();
  }
  });
 }
 });
});

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