先看效果吧：
目的就是使用户能够不用刷新就能获得帖子更新。
第一步：修改模板文件forumdisplay,htm
1、在文件开头添加ajax请求的判断
<!–{if !$inajax}–>
如图：
2、在文件结尾加上else
<!–{else}–>
{template header_ajax}
<table>
<!–{loop $threadlist $key $thread}–>
<tbody id=”$thread[id]“>
<tr>
<td class=”folder”>
<a href=”viewthread.php?tid=$thread[tid]&extra=$extra” title=”{lang target_blank}” target=”_blank”>
<!–{if $thread[folder] == ‘lock’}–>
<img src=”{IMGDIR}/folder_lock.gif” /></a>
<!–{elseif in_array($thread['displayorder'], array(1, 2, 3, 4))}–>
<img src=”{IMGDIR}/pin_$thread[displayorder].gif” alt=”$threadsticky[3-$thread[displayorder]]” /></a>
<!–{else}–>
<img src=”{IMGDIR}/folder_$thread[folder].gif” /></a>
<!–{/if}–>
</td>
<td class=”icon”>
<!–{if $thread['special'] == 1}–>
<a href=”forumdisplay.php?fid=$fid&filter=poll”><img src=”{IMGDIR}/pollsmall.gif” alt=”{lang thread_poll}” /></a>
<!–{elseif $thread['special'] == 2}–>
<a href=”forumdisplay.php?fid=$fid&filter=trade”><img src=”{IMGDIR}/tradesmall.gif” alt=”{lang thread_trade}” /></a>
<!–{elseif $thread['special'] == 3}–>
<a href=”forumdisplay.php?fid=$fid&filter=reward”><img src=”{IMGDIR}/rewardsmall.gif” alt=”{lang thread_reward}” <!–{if $thread['price'] < 0}–>class=”solved”<!–{/if}–> /></a>
<!–{elseif $thread['special'] == 4}–>
<a href=”forumdisplay.php?fid=$fid&filter=activity”><img src=”{IMGDIR}/activitysmall.gif” alt=”{lang thread_activity}” /></a>
<!–{elseif $thread['special'] == 5}–>
<a href=”forumdisplay.php?fid=$fid&filter=debate”><img src=”{IMGDIR}/debatesmall.gif” alt=”{lang thread_debate}” /></a>
<!–{else}–>
$thread['icon']
<!–{/if}–>
</td>
<!–{if $forum['ismoderator']}–>
<td class=”icon”>
<!–{if $thread['fid'] == $fid && $thread['digest'] >= 0}–>
<!–{if $thread['displayorder'] <= 3 || $adminid == 1}–>
<input onclick=”tmodclick(this)” class=”checkbox” type=”checkbox” name=”moderate[]” value=”$thread[tid]” />
<!–{else}–>
<input class=”checkbox” type=”checkbox” disabled=”disabled” />
<!–{/if}–>
<!–{else}–>
<input class=”checkbox” type=”checkbox” disabled=”disabled” />
<!–{/if}–>
</td>
<!–{/if}–>
<th class=”subject $thread[folder]“>
<label>{$pluginhooks[forumdisplay_thread][$key]} </label>
<!–{if $thread['moved']}–>
<!–{if $forum['ismoderator']}–>
<a href=”topicadmin.php?action=moderate&optgroup=3&operation=delete&tid=$thread[moved]” onclick=”showWindow(‘mods’, this.href);return false”>{lang thread_moved}:</a>
<!–{else}–>
{lang thread_moved}:
<!–{/if}–>
<!–{/if}–>
$thread[sortid] $thread[typeid]
<span id=”thread_$thread[tid]“><a href=”viewthread.php?tid=$thread[tid]&extra=$extra”$thread[highlight]>$thread[subject]</a></span>
<!–{if $thread['readperm']}–> – [{lang readperm} <span class="bold">$thread[readperm]</span>]<!–{/if}–>
<!–{if $thread['price'] > 0}–>
<!–{if $thread['special'] == ’3′}–>
– <span style=”color: #C60″>[{lang thread_reward}{$extcredits[$creditstransextra[2]][title]} <span class=”bold”>$thread[price]</span> {$extcredits[$creditstransextra[2]][unit]}]</span>
<!–{else}–>
– [{lang price} {$extcredits[$creditstransextra[1]][title]} <span class=”bold”>$thread[price]</span> {$extcredits[$creditstransextra[1]][unit]}]
<!–{/if}–>
<!–{elseif $thread['special'] == ’3′ && $thread['price'] < 0}–>
– <span style=”color: #269F11″>[{lang reward_solved}]</span>
<!–{/if}–>
<!–{if $thread['attachment'] == 2}–>
<img src=”images/attachicons/image_s.gif” alt=”{lang attach_img}” class=”attach” />
<!–{elseif $thread['attachment'] == 1}–>
<img src=”images/attachicons/common.gif” alt=”{lang attachment}” class=”attach” />
<!–{/if}–>
<!–{if $thread['displayorder'] == 0}–>
<!–{if $thread[recommendicon]}–>
<img src=”{IMGDIR}/recommend_$thread[recommendicon].gif” class=”attach” alt=”{lang thread_recommend}” title=”{lang thread_recommend}” />
<!–{/if}–>
<!–{if $thread[heatlevel]}–>
<img src=”{IMGDIR}/hot_$thread[heatlevel].gif” class=”attach” alt=”$thread[heatlevel] {lang heats}” title=”$thread[heatlevel] {lang heats}” />
<!–{/if}–>
<!–{if $thread['digest'] > 0}–>
<img src=”{IMGDIR}/digest_$thread[digest].gif” class=”attach” alt=”{lang thread_digest} $thread[digest]” title=”{lang thread_digest} $thread[digest]” />
<!–{/if}–>
<!–{if $thread['rate'] > 0}–>
<img src=”{IMGDIR}/agree.gif” class=”attach” alt=”{lang rate_credit_add}” title=”{lang rate_credit_add}” />
<!–{/if}–>
<!–{/if}–>
<!–{if $thread[multipage]}–>
<span class=”threadpages”>$thread[multipage]</span>
<!–{/if}–>
</th>
<td class=”author”>
<cite>
<!–{if $thread['authorid'] && $thread['author']}–>
<a href=”space.php?uid=$thread[authorid]“>$thread[author]</a>
<!–{else}–>
<!–{if $forum['ismoderator']}–>
<a href=”space.php?uid=$thread[authorid]“>{lang anonymous}</a>
<!–{else}–>
{lang anonymous}
<!–{/if}–>
<!–{/if}–>
</cite>
<em>$thread[dateline]</em>
</td>
<td class=”nums”><strong>$thread[replies]</strong>/<em>$thread[views]</em></td>
<td class=”lastpost”>
<cite><!–{if $thread['lastposter']}–><a href=”{if $thread[digest] != -2}space.php?username=$thread[lastposterenc]{else}viewthread.php?tid=$thread[tid]&page={echo max(1, $thread[pages]);}{/if}”>$thread[lastposter]</a><!–{else}–>{lang anonymous}<!–{/if}–></cite>
<em><a href=”{if $thread[digest] != -2}redirect.php?tid=$thread[tid]&goto=lastpost$highlight#lastpost{else}viewthread.php?tid=$thread[tid]&page={echo max(1, $thread[pages]);}{/if}”>$thread[lastpost]</a></em>
</td>
</tr>
</tbody>
<!–{/loop}–>
</table>
{template footer_ajax}
<!–{/if}–>
如图：
3、增加模板调用forumdisplay_ajax
<!–用于ajax自动更新页面 start–>
{template forumdisplay_ajax}
<!–用于ajax自动更新页面 end—>
如图：
第二步：添加模板文件forumdisplay_ajax.htm到模板default目录
文件内容：
<style type=”text/css”>
.newnotice{
font-size:13px;display:block;padding:5px 1px;margin:2px 0px 2px 0px;cursor:pointer;background:#E3F1FA;border:1px solid #C6E4F2;text-align:center;text-shadow:0 1px 0 #fff;-moz-border-radius:3px;-webkit-border-radius:3px;border-radius:3px;z-index:2;
}
.newnotice:hover{
background-color:rgba(0,132,180,0.2);border-color:rgba(0,132,180,0.25);
}
</style>
<tbody style=”display:none;”>
<tr>
<td colspan=”7″><div id=”newnotice1″ class=”newnotice” onclick=”shownewthread();”> </div></td>
</tr>
</tbody>
<script type=”text/javascript”>
var now=new Date();
var timeline=Math.floor(now.getTime()/1000);
var div_unread1=document.createElement(‘div’);
div_unread1.id=”unread1″;
div_unread1.style.display=”none”;
var div_unread2=document.createElement(‘div’);
div_unread2.id=”unread2″;
div_unread2.style.display=”none”;
_attachEvent(window, ‘load’,ajax_forum, document);
function ajax_forum(){
document.body.appendChild(div_unread1);
document.body.appendChild(div_unread2);
setInterval(checknewthread,60000);
}
function shownewthread(){
var noticetbody=$(‘newnotice1′).parentNode.parentNode.parentNode;
noticetbody.style.display=”none”;
var newthreads=div_unread1.getElementsByTagName(‘tbody’);
var newcount=newthreads.length;
document.title=document.title.replace(/(.+)/g,”);
for(i=0;i<newcount;i++){
noticetbody.parentNode.insertBefore(newthreads[0],noticetbody.nextSibling);
}
}
function storenewthread(){
var newthreads=div_unread2.getElementsByTagName(‘tbody’);
var newcount=newthreads.length;
if(BROWSER.ie){
//如果是ie还要继续判断一下，ie回自动为table添加tbody
if(div_unread2.innerHTML.length<=32){
newcount=0;
}
}
for(i=0;i<newcount;i++){
//div_unread1.insertBefore(newthreads[0],div_unread1.getElementsByTagName(‘tbody’)[0]);
div_unread1.appendChild(newthreads[0]);
}
var newcount=div_unread1.getElementsByTagName(‘tbody’).length;
var newtitle=document.title;
if(newcount){
$(‘newnotice1′).innerHTML=newcount+” new threads”;
$(‘newnotice1′).parentNode.parentNode.parentNode.style.display=”table-header-group”;
if(newtitle.indexOf(‘(‘)!=-1){
document.title=newtitle.replace(/(.+)/g,’(‘+newcount+’)');
}else{
document.title=’(‘+newcount+’) ‘+document.title;
}
}else{
$(‘newnotice1′).parentNode.parentNode.parentNode.style.display=”none”;
}
}
function checknewthread(){
ajaxget(“forumdisplay.php?checknewthread=” + Math.random() +”&fid=”+fid+”&dateline=”+timeline,”unread2″,”,”,’none’,storenewthread);
now=new Date();
timeline=Math.floor(now.getTime()/1000);
}
</script>
第三步：修改forumdisplay.php（位于根目录）
1、增加数据库查询限制语句
/*用于ajax自动更新页面 start*/
$ajaxunread=false;
$ajaxunread=$inajax && $dateline && $ajaxtarget==’unread2′;
if($ajaxunread)
{
$filteraddajax=”AND dateline>=’$dateline’”;
}
/*用于ajax自动更新页面 end*/
位置在这里：
2、添加到查询中，如图的三个位置
第四步：修补一些小的细节
1、这样请求会照成对在线时间统计的混乱，相当于用户可以“挂机”了，所以对于这些请求不能计算在在线时间里
在forumdisplay.php文件里面做修改
将
updatesession()
修改成
if(!$ajaxunread)updatesession();
不过效果还没有测试。
2、本来在帖子浏览页面（viewthread.php）也是可以增加ajax请求的，样式和方法都类似，但是一般用户关注的帖子都会有短消息提示，所以我们只需要不断请求短消息就可以了（其实是我偷懒了，(^o^)/~）
discuz本身会在页面载入完成后请求一次短消息：
在include/js/common.js文件里面：
_attachEvent(window, ‘load’, pmchecknew, document);
其中的pmcheckmew是ajax请求短消息更新，
所以我们在其下面添加一段：
_attachEvent(window, ‘load’, function(){setInterval(pmchecknew,30000)}, document);
为了能够及时的更新短消息，采取的是重新再绑定函数的方法，如果直接替换掉以前的那么页面就需要在等待30s才会检查短消息。
最好更新缓存，生效！
补充：经测试ie5.5以上以及FF、chorme通过！
