changel的作用是调用网站栏目，根据row这个属性可以自定义调出栏目个数。但在有的频道页面需要调用一些指定ID几到几的一些栏目。可能有一些人想直接将链接写死在模版里。后来觉得这样对程序的扩展性不是很好。客户是不懂程序的，你不能指望他也会修改模版。于是就有了做这样一个小功能的想法。
在原来的dede:channel基础上增加了一个limit属性。 limit是起点，row是条数
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{dede:channel type='son' limit='2' typeid='1' reid='1' row='10' "
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<a href='~typelink~' class='thisclass'>~typename~</a> |"}
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<a href="[field:typelink/]">
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<span class="aaa">[field:typename/]</span>
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</a>
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{/dede:channel}
将以下的代码复制到--网站域名/include/taglib/channel.lib.php中进行覆盖：
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function lib_channel(&$ctag,&$refObj)
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{
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global $dsql;
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$attlist = "typeid|0,reid|0,row|100,col|1,type|son,currentstyle|,cacheid|,limit|0";
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FillAttsDefault($ctag->CAttribute->Items,$attlist);
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extract($ctag->CAttribute->Items, EXTR_SKIP);
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$innertext = $ctag->GetInnerText();
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$line = emptyempty($row) ? 100 : $row;
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$likeType = '';
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//读取固定的缓存块
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$cacheid = trim($cacheid);
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if($cacheid !='') {
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$likeType = GetCacheBlock($cacheid);
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if($likeType != '') return $likeType;
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}
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$reid = 0;
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$topid = 0;
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//如果属性里没指定栏目id，从引用类里获取栏目信息
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if(emptyempty($typeid))
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{
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if( isset($refObj->TypeLink->TypeInfos['id']) )
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{
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$typeid = $refObj->TypeLink->TypeInfos['id'];
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$reid = $refObj->TypeLink->TypeInfos['reid'];
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$topid = $refObj->TypeLink->TypeInfos['topid'];
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}
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else {
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$typeid = 0;
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}
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}
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//如果指定了栏目id，从数据库获取栏目信息
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else
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{
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$row2 = $dsql->GetOne("Select * From `dede_arctype` where id='$typeid' ");
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$typeid = $row2['id'];
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$reid = $row2['reid'];
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$topid = $row2['topid'];
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$issetInfos = true;
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}
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if($type=='' || $type=='sun') $type='son';
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if($innertext=='') $innertext = GetSysTemplets("channel_list.htm");
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if($type=='top')
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{
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$sql = "Select id,typename,typedir,isdefault,ispart,defaultname,namerule2,moresite,siteurl,sitepath
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From `dede_arctype` where reid=0 And ishidden<>1 order by sortrank asc limit $limit, $line ";
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}
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else if($type=='son')
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{
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if($typeid==0) return '';
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$sql = "Select id,typename,typedir,isdefault,ispart,defaultname,namerule2,moresite,siteurl,sitepath From `dede_arctype` where reid='$typeid' And ishidden<>1 order by sortrank asc limit $limit, $line ";
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}
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else if($type=='self')
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{
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if($reid==0) return '';
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$sql = "Select id,typename,typedir,isdefault,ispart,defaultname,namerule2,moresite,siteurl,sitepath From `dede_arctype` where reid='$reid' And ishidden<>1 order by sortrank asc limit $limit, $line ";
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}
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//And id<>'$typeid'
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$needRel = false;
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$dtp2 = new DedeTagParse();
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$dtp2->SetNameSpace('field','[',']');
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$dtp2->LoadSource($innertext);
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//检查是否有子栏目，并返回rel提示（用于二级菜单）
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if(ereg(':rel', $innertext)) $needRel = true;
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if(emptyempty($sql)) return '';
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$dsql->SetQuery($sql);
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$dsql->Execute();
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$totalRow = $dsql->GetTotalRow();
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//如果用子栏目模式，当没有子栏目时显示同级栏目
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if($type=='son' && $reid!=0 && $totalRow==0)
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{
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$sql = "Select id,typename,typedir,isdefault,ispart,defaultname,namerule2,moresite,siteurl,sitepath From `dede_arctype` where reid='$reid' And ishidden<>1 order by sortrank asc limit $limit, $line ";
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$dsql->SetQuery($sql);
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$dsql->Execute();
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}
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$GLOBALS['autoindex'] = 0;
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for($i=0;$i < $line;$i++)
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{
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if($col>1) $likeType .= "<dl> ";
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for($j=0; $j<$col; $j++)
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{
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if($col>1) $likeType .= "<dd> ";
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if($row=$dsql->GetArray())
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{
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$row['sonids'] = $row['rel'] = '';
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if($needRel)
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{
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$row['sonids'] = GetSonIds($row['id'], 0, false);
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if($row['sonids']=='') $row['rel'] = '';
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else $row['rel'] = " rel='dropmenu{$row['id']}'";
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}
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//处理同级栏目中，当前栏目的样式
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if( ($row['id']==$typeid || ($topid==$row['id'] && $type=='top') ) && $currentstyle!='' )
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{
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$linkOkstr = $currentstyle;
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$row['typelink'] = GetOneTypeUrlA($row);
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$linkOkstr = str_replace("~rel~",$row['rel'],$linkOkstr);
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$linkOkstr = str_replace("~id~",$row['id'],$linkOkstr);
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$linkOkstr = str_replace("~typelink~",$row['typelink'],$linkOkstr);
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$linkOkstr = str_replace("~typename~",$row['typename'],$linkOkstr);
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$likeType .= $linkOkstr;
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}
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else
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{
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$row['typelink'] = $row['typeurl'] = GetOneTypeUrlA($row);
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if(is_array($dtp2->CTags))
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{
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foreach($dtp2->CTags as $tagid=>$ctag)
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{
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if(isset($row[$ctag->GetName()])) $dtp2->Assign($tagid,$row[$ctag->GetName()]);
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}
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}
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$likeType .= $dtp2->GetResult();
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}
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}
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if($col>1) $likeType .= "</dd> ";
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$GLOBALS['autoindex']++;
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}
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//Loop Col
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if($col>1)
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{
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$i += $col - 1;
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$likeType .= " </dl> ";
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}
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}
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//Loop for $i
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$dsql->FreeResult();
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if($cacheid !='') {
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WriteCacheBlock($cacheid, $likeType);
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}
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return $likeType;
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}
