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，删掉了一些无用的赋值。
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.sitepath
FROM `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['description'].'...';
$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']);
$row['stime'] = GetDateMK($row['pubdate']);
$row['typelink'] = "<a href='".$row['typeurl']."'>".$row['typename']."</a>";//分类链
$data[$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="//upcdn.b0.upaiyun.com/libs/jquery/jquery-1.7.1.min.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:22,//跳过首页默认调用条数
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;
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>');
if(data[i].litpic){
arr.push('<a href="'+data[i].arcurl+'" class="preview">');
arr.push('<img src="'+data[i].litpic+'">');
arr.push('</a>');
}
arr.push('<a href="'+data[i].arcurl+'" class="title">'+data[i].title+'</a>');
arr.push('<b>'+data[i].typelink+'</b>');
arr.push('<span class="info"> <a><small>日期：</small>'+data[i].stime+' </a><a><small>点击</small>'+data[i].click+' </a></span>');
arr.push('<p class="intro">'+data[i].info+'</p>');
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 data-list">
{dede:arclist row=22 orderby=pubdate titlelen=100}
<li> [field:array runphp='yes']@me = (strpos(@me['litpic'],'defaultpic') ? "" : "<a href='{@me['arcurl']}' class='preview'><img src='{@me['litpic']}'/></a>"); [/field:array]
<a href="[field:arcurl/]" class="title">[field:title/]</a> <b>[field:typelink/]</b> <span class="info"> <a><small>日期：</small>[field:pubdate function="GetDateTimeMK(@me)"/] </a><a><small>点击</small>[field:click/] </a></span>
<p class="intro"> [field:description/]... </p>
</li>
{/dede:arclist}
</ul>
</div>
