织梦dedecms利用ajax实现瀑布流无限加载的教程

更新时间：2017-09-16•点击： • 技术分享

很多用织梦dedecms做图片类的网站都需要用到无限加载这个功能，这个功能需要用到ajax，下面就告诉大家如何实现这样的功能。

 

首先找到并打开/plus/list.php文件，在里面找到如下代码：

 

1 require_once(dirname(__FILE__)."/../include/common.inc.php");

 

 

在其下面添加如下代码：

 

01 if(isset($_GET['ajax'])){
02      $typeid = isset($_GET['typeid']) ? intval($_GET['typeid']): 0;//传递过来的分类ID
03   $page = isset($_GET['page']) ? intval($_GET['page']): 0;//页码
04   $pagesize = isset($_GET['pagesize']) ? intval($_GET['pagesize']): 15;//每页多少条，也就是一次加载多少条数据
05   $start = $page>0 ? ($page-1)*$pagesize : 0;//数据获取的起始位置。即limit条件的第一个参数。
06   $typesql = $typeid ? " WHERE typeid=$typeid" : '';//这个是用于首页实现瀑布流加载，因为首页加载数据是无需分类的，所以要加以判断，如果无需
07    $total_sql = "SELECT COUNT(id) as num FROM `tufei_archives`  $typesql ";
08   $temp = $dsql->GetOne($total_sql);
09   $total = 0;//数据总数
10   $load_num =0;
11   if(is_array($temp)){
12     $load_num= round(($temp['num']-15)/$pagesize);//要加载的次数,因为默认已经加载了
13     $total = $temp['num'];
14   }
15   $sql = "SELECT a.*,t.typedir,t.typename,t.isdefault,t.defaultname,t.namerule,
16         t.namerule2,t.ispart, t.moresite,t.siteurl,t.sitepath
17 FROM `tufei_archives` as a JOIN `tufei_arctype` AS t ON a.typeid=t.id   $typesql ORDER BY id DESC LIMIT $start,$pagesize";
18 //echo "$sql";
19    $dsql->SetQuery($sql);
20     $dsql->Execute('list');
21    $statu = 0;//是否有数据，默认没有数据
22    $data = array();
23      $index = 0;
24 while($row = $dsql->GetArray("list")){
25     $row['info'] = $row['info'] = $row['infos'] = cn_substr($row['description'],160);
26      $row['id'] =  $row['id'];
27      $row['filename'] = $row['arcurl'] = GetFileUrl($row['id'],
28 $row['typeid'],$row['senddate'],$row['title'],$row['ismake'],
29 $row['arcrank'],$row['namerule'],$row['typedir'],$row['money'],
30 $row['filename'],$row['moresite'],$row['siteurl'],$row['sitepath']);
31 $row['typeurl'] = GetTypeUrl($row['typeid'],$row['typedir'],
32 $row['isdefault'],$row['defaultname'],$row['ispart'],
33    $row['namerule2'],$row['moresite'],$row['siteurl'],$row['sitepath']);
34   if($row['litpic'] == '-' || $row['litpic'] == ''){
35       $row['litpic'] = $GLOBALS['cfg_cmspath'].'/images/defaultpic.gif';
36    }
37     if(!preg_match("#^http:\/\/#i", $row['litpic']) &&$GLOBALS['cfg_multi_site'] == 'Y'){
38     $row['litpic'] = $GLOBALS['cfg_mainsite'].$row['litpic'];
39    }
40   $row['picname'] = $row['litpic'];//缩略图
41    $row['stime'] = GetDateMK($row['pubdate']);
42   $row['typelink'] = "<a href='".$row['typeurl']."'>".$row['typename']."</a>";//分类链
43   $row['fulltitle'] = $row['title'];//完整的标题
44   $row['shorttitle'] = $row['shorttitle'];//副标题
45   $row['title'] = cn_substr($row['title'], 60);//截取后的标题
46    $data[$index] = $row;
47    $index++;
48 }
49 if(!empty($data)){
50 $statu = 1;//有数据
51 }
52 $result =array('statu'=>$statu,'list'=>$data,'total'=>$total,'load_num'=>$load_num);
53 echo json_encode($result);//返回数据
54 exit();
55 }

 

 

然后在需要使用无线加载的模板里引用下面这个js代码：

 

1 <script src="http://libs.baidu.com/jquery/1.9.0/jquery.js"></script>

 

并在底部添加如下代码：

 

01 <script type="text/javascript">
02 var loadConfig = {
03                 url_api:'/plus/list.php',
04                 typeid:0,
05                 page:2,
06                 pagesize:3,
07                 loading : 0,
08                 }
09 function  loadMoreApply(){
10     if(loadConfig.loading == 0){
11          var typeid = loadConfig.typeid;
12          var page = loadConfig.page;
13          var pagesize = loadConfig.pagesize;
14          var url = loadConfig.url_api,data={ajax:'pullload',typeid:typeid,page:page,pagesize:pagesize};
15          var sTop = document.body.scrollTop || document.documentElement.scrollTop, dHeight = $(document).height(), cHeight = document.documentElement.clientHeight;
16          console.log(dHeight);
17          if (sTop + cHeight >= dHeight - cHeight) {
18              loadConfig.loading = 1;
19             function ajax(url, data) {
20                 $.ajax({url: url,data: data,async: false,type: 'GET',dataType:'json',success: function(data) {
21                 
22                     addContent(data);  
23                     
24                 }});
25                 
26             }
27             ajax(url,data);
28         
29         }
30     }
31 }
32  function addContent (rs){
33     if(rs.statu== 1){
34         var data = rs.list;
35         var total = rs.total;
36         var arr=[];
37         var length = data.length;
38         for(var i=0;i<length;i++){
39             arr.push('<a href="'+data[i].arcurl+'">');
40             arr.push('<div class="item">');
41             arr.push('<div class="thumbnail">');
42             arr.push('<img class="img-responsive" src="'+data[i].picname+'" width=460 height=255 />');
43             arr.push('</div>');
44             arr.push('<div class="caption">');
45             arr.push('<h3>'+data[i].title+'</h3>');
46             arr.push('<div class="place">'+data[i].shorttitle+'</div>');
47             arr.push('</div>');
48             arr.push('</div>');
49             arr.push('</a>');
50                     
51         }
52         $('.data-list').append(arr.join(''));
53     
54         loadConfig.load_num = rs.load_num;
55     
56         if(total<loadConfig.page*loadConfig.pagesize || loadConfig.page > loadConfig.load_num){
57             window.removeEventListener('srcoll',loadMoreApply,false);
58         }
59         loadConfig.page++;
60         loadConfig.loading = 0;
61     }
62 }
63 function pullLoad(){
64     window.addEventListener('scroll', loadMoreApply, false);
65 }
66 pullLoad()
67 checkMobile();
68  
69 </script>

 

上面的代码中的”$('.data-list').append(arr.join(''));“里的”data-list“对应模板内列表的外框class属性。
 
arr.push部分对应的是列表代码，
 
 
这样就可以使用无线加载了。
 
如果在列表页只需把代码中的”typeid:0,“ 修改为”typeid:{dede:field name="typeid"/},“即可。

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