最近在学javascript，才慢慢开始读懂JS代码。对HTML前台AJAX加载技术研究了一番，像博客站或者图片站运用AJAX异步无限加载，做成瀑布流，提高用户体验，这是AJAX异步加载的优点。
AJAX异步加载的弊端：属于WEB前端技术，蜘蛛不会抓JS调用的内容，也就是并不利于SEO优化。所以要运用这个功能的话最好有一部分直接调用，另一部分采用AJAX异步加载。
接下来用织梦来做AJAX异步加载WEB前端开发。网上有诸多教程，经过笔者整理，给出详细说明，修正后分享给大家。
打开/plus/list.php，找到
require_once(dirname(__FILE__)."/../include/common.inc.php");
下面增加代码
if(isset($_GET['ajax'])){$typeid = isset($_GET['typeid']) ? intval($_GET['typeid']): 0;//传递过来的分类ID$page = isset($_GET['page']) ? intval($_GET['page']): 0;//页码$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$start = $page>0 ? ($page-1)*$pagesize : 0;//数据获取的起始位置。即limit条件的第一个参数。$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$total_sql = "SELECT COUNT(id) as num FROM `dede_archives` $typesql ";$temp = $dsql->GetOne($total_sql);$total = 0;//数据总数$load_num =0;if(is_array($temp)){$load_num= round(($temp['num']-15)/$pagesize);//要加载的次数,因为默认已经加载了$total = $temp['num'];}$sql = "SELECT a.*,t.typedir,t.typename,t.isdefault,t.defaultname,t.namerule,t.namerule2,t.ispart, t.moresite,t.siteurl,t.sitepathFROM `dede_archives` as a JOIN `dede_arctype` AS t ON a.typeid=t.id $typesql ORDER BY id DESC LIMIT $start,$pagesize";//echo "$sql";$dsql->SetQuery($sql);$dsql->Execute('list');$statu = 0;//是否有数据，默认没有数据$data = array();$index = 0;while($row = $dsql->GetArray("list")){$row['info'] = $row['info'] = $row['infos'] = cn_substr($row['description'],160);$row['id'] = $row['id'];$row['filename'] = $row['arcurl'] = GetFileUrl($row['id'],$row['typeid'],$row['senddate'],$row['title'],$row['ismake'],$row['arcrank'],$row['namerule'],$row['typedir'],$row['money'],$row['filename'],$row['moresite'],$row['siteurl'],$row['sitepath']);$row['typeurl'] = GetTypeUrl($row['typeid'],$row['typedir'],$row['isdefault'],$row['defaultname'],$row['ispart'],$row['namerule2'],$row['moresite'],$row['siteurl'],$row['sitepath']);if($row['litpic'] == '-' || $row['litpic'] == ''){$row['litpic'] = $GLOBALS['cfg_cmspath'].'/images/defaultpic.gif';}if(!preg_match("#^http://#i", $row['litpic']) &&$GLOBALS['cfg_multi_site'] == 'Y'){$row['litpic'] = $GLOBALS['cfg_mainsite'].$row['litpic'];}$row['picname'] = $row['litpic'];//缩略图$row['stime'] = GetDateMK($row['pubdate']);$row['typelink'] = "<a href='".$row['typeurl']."'>".$row['typename']."</a>";//分类链$row['fulltitle'] = $row['title'];//完整的标题$row['shorttitle'] = $row['shorttitle'];//副标题$row['title'] = cn_substr($row['title'], 60);//截取后的标题$data[$index] = $row;$index++;}if(!empty($data)){$statu = 1;//有数据}$result =array('statu'=>$statu,'list'=>$data,'total'=>$total,'load_num'=>$load_num);echo json_encode($result);//返回数据exit();}
模板文件增加内容
在需要用AJAX异步加载的模板的</head>前增加代码
<script src="http://libs.baidu.com/jquery/1.9.0/jquery.js"></script><script type="text/javascript">var loadConfig = {url_api:'{dede:global.cfg_cmspath/}/plus/list.php', //修正plus目录typeid:{dede:field name='typeid'/}, //首页此处是typeid:0,page:2,pagesize:3,loading : 0,}function loadMoreApply(){if(loadConfig.loading == 0){var typeid = loadConfig.typeid;var page = loadConfig.page;var pagesize = loadConfig.pagesize;var url = loadConfig.url_api,data={ajax:'pullload',typeid:typeid,page:page,pagesize:pagesize};var sTop = document.body.scrollTop || document.documentElement.scrollTop, dHeight = $(document).height(), cHeight = document.documentElement.clientHeight;console.log(dHeight);if (sTop + cHeight >= dHeight – cHeight) {loadConfig.loading = 1;function ajax(url, data) {$.ajax({url: url,data: data,async: false,type: 'GET',dataType: 'json',success: function(data) {addContent(data);}});}ajax(url,data);}}}function addContent (rs){if(rs.statu== 1){var data = rs.list;var total = rs.total;var arr=[];var length = data.length;for(var i=0;i<length;i++){arr.push('<li>');arr.push('<a href="'+data[i].arcurl+'" class="preview">');arr.push('<img class="" width="" height="" alt="data[i].title" src="'+data[i].picname+'" />');arr.push('</a>');arr.push('[<b>'+data[i].typelink+'</b>]');arr.push('<a href="'+data[i].arcurl+'" class="title">'+data[i].title+'</a>');arr.push('</li>');}$('.data-list').append(arr.join(''));loadConfig.load_num = rs.load_num;if(total<loadConfig.page*loadConfig.pagesize || loadConfig.page > loadConfig.load_num){window.removeEventListener('srcoll',loadMoreApply,false);}loadConfig.page++;loadConfig.loading = 0;}}function pullLoad(){window.addEventListener('scroll', loadMoreApply, false);}pullLoad();</script>
首页HTML代码示例
注意：首页模板用arclist标签，用row='3'是初始化调用的3条；列表模板用list标签，用pagesize='3'。模板里面的<div class="data-list">与js里面的data-list对应，需要把循环部分全部包裹起来
<div class="listbox"><ul class="e2"><div class="data-list">{dede:arclist row='3'}<li> [field:array runphp='yes']@me = (empty(@me['litpic']) ? "" : "<a href='{@me['arcurl']}' class='preview'><img src='{@me['litpic']}'/></a>"); [/field:array][<b>[field:typelink/]</b>] <a href="[field:arcurl/]" class="title">[field:title/]</a> <span class="info"> <small>日期：</small>[field:pubdate function="GetDateTimeMK(@me)"/] <small>点击：</small>[field:click/] <small>好评：</small>[field:scores/] </span><p class="intro"> [field:description/]… </p></li>{/dede:arclist}</div><!–data-list–></ul></div><!– /listbox –>
标签： ajax清除缓存, js换行, web, 加载, 异步
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