php 重写分页器 CLinkPager的实例
1、自定义的分页器类放在哪里？
有两个位置可以放，
第一种是放在 protected/extensions 中，在使用是import进来，或在config文件中import进来；
第二种是放在 protected/components 中，作为组件存在，不需要import
2、用派生方式是最好的
class MyPager extends CLinkPager
入口函数是：public function run() ，当显示分页器时run()被调用，里面的输出就会显示在相应位置；
其他的完全自定义，如果你不知道上一页、下一页、首页、尾页、总页数、当前页码等信息，可以参考CLinkPager的源码，yii/frameworks/web/widgets/pagers/CLinkPager.php
<?php class MyPager extends CLinkPager { const CSS_FIRST_PAGE='first'; const CSS_LAST_PAGE='last'; const CSS_PREVIOUS_PAGE='previous'; const CSS_NEXT_PAGE='next'; const CSS_INTERNAL_PAGE='page'; const CSS_HIDDEN_PAGE='hidden'; const CSS_SELECTED_PAGE='selected'; /** * @var string the CSS class for the first page button. Defaults to 'first'. * @since 1.1.11 */ public $firstPageCssClass=self::CSS_FIRST_PAGE; /** * @var string the CSS class for the last page button. Defaults to 'last'. * @since 1.1.11 */ public $lastPageCssClass=self::CSS_LAST_PAGE; /** * @var string the CSS class for the previous page button. Defaults to 'previous'. * @since 1.1.11 */ public $previousPageCssClass=self::CSS_PREVIOUS_PAGE; /** * @var string the CSS class for the next page button. Defaults to 'next'. * @since 1.1.11 */ public $nextPageCssClass=self::CSS_NEXT_PAGE; /** * @var string the CSS class for the internal page buttons. Defaults to 'page'. * @since 1.1.11 */ public $internalPageCssClass=self::CSS_INTERNAL_PAGE; /** * @var string the CSS class for the hidden page buttons. Defaults to 'hidden'. * @since 1.1.11 */ public $hiddenPageCssClass=self::CSS_HIDDEN_PAGE; /** * @var string the CSS class for the selected page buttons. Defaults to 'selected'. * @since 1.1.11 */ public $selectedPageCssClass=self::CSS_SELECTED_PAGE; /** * @var integer maximum number of page buttons that can be displayed. Defaults to 10. */ public $maxButtonCount=10; /** * @var string the text label for the next page button. Defaults to 'Next >'. */ public $nextPageLabel; /** * @var string the text label for the previous page button. Defaults to '< Previous'. */ public $prevPageLabel; /** * @var string the text label for the first page button. Defaults to '<< First'. */ public $firstPageLabel; /** * @var string the text label for the last page button. Defaults to 'Last >>'. */ public $lastPageLabel; /** * @var string the text shown before page buttons. Defaults to 'Go to page: '. */ public $header; /** * @var string the text shown after page buttons. */ public $footer=''; /** * @var mixed the CSS file used for the widget. Defaults to null, meaning * using the default CSS file included together with the widget. * If false, no CSS file will be used. Otherwise, the specified CSS file * will be included when using this widget. */ public $cssFile; /** * @var array HTML attributes for the pager container tag. */ public $htmlOptions=array(); /** * Initializes the pager by setting some default property values. */ public function init() { if($this->nextPageLabel===null) $this->nextPageLabel=Yii::t('yii','Next >'); if($this->prevPageLabel===null) $this->prevPageLabel=Yii::t('yii','< Previous'); //if($this->firstPageLabel===null) // $this->firstPageLabel=Yii::t('yii','<< First'); //if($this->lastPageLabel===null) // $this->lastPageLabel=Yii::t('yii','Last >>'); if($this->header===null) $this->header=Yii::t('yii','Go to page: '); if(!isset($this->htmlOptions['id'])) $this->htmlOptions['id']=$this->getId(); if(!isset($this->htmlOptions['class'])) $this->htmlOptions['class']='yiiPager'; } /** * Executes the widget. * This overrides the parent implementation by displaying the generated page buttons. */ public function run() { $this->registerClientScript(); $buttons=$this->createPageButtons(); if(empty($buttons)) return; echo $this->header; // echo CHtml::tag('ul',$this->htmlOptions,implode("\n",$buttons)); echo implode("\n",$buttons); echo $this->footer; } /** * Creates the page buttons. * @return array a list of page buttons (in HTML code). */ protected function createPageButtons() { if(($pageCount=$this->getPageCount())<=1) return array(); list($beginPage,$endPage,$ellipsis)=$this->getPageRange(); $currentPage=$this->getCurrentPage(false); // currentPage is calculated in getPageRange() $buttons=array(); // first page //$buttons[]=$this->createPageButton($this->firstPageLabel,0,$this->firstPageCssClass,$currentPage<=0,false); // prev page if(($page=$currentPage-1)<0) $page=0; if($currentPage == 0){ $buttons[] = "<span><上一頁</span>"; }else{ $buttons[]=$this->createPageButton($this->prevPageLabel,$page,$this->previousPageCssClass,$currentPage<=0,false); } // internal pages start // first $buttons[]=$this->createPageButton(1,0,$this->internalPageCssClass,false,$i==$currentPage); //middle if($ellipsis == 'both'){ $buttons[] = "<span>...</span>"; } for($i=$beginPage;$i<=$endPage;++$i){ if($ellipsis == 'left' && $i == $beginPage){ $buttons[] = "<span>...</span>"; } $buttons[]=$this->createPageButton($i+1,$i,$this->internalPageCssClass,false,$i==$currentPage); if($ellipsis == 'right' && $i == $endPage){ $buttons[] = "<span>...</span>"; } } if($ellipsis == 'both'){ $buttons[] = "<span>...</span>"; } // last $buttons[]=$this->createPageButton($pageCount,$pageCount - 1,$this->internalPageCssClass,false,$i==$currentPage); // internal pages end // next page if(($page=$currentPage+1)>=$pageCount-1) $page=$pageCount-1; if($currentPage == ($pageCount-1)){ $buttons[] = "<span>下一頁></span>"; }else{ $buttons[]=$this->createPageButton($this->nextPageLabel,$page,$this->nextPageCssClass,$currentPage>=$pageCount-1,false); } // last page //$buttons[]=$this->createPageButton($this->lastPageLabel,$pageCount-1,$this->lastPageCssClass,$currentPage>=$pageCount-1,false); return $buttons; } /** * Creates a page button. * You may override this method to customize the page buttons. * @param string $label the text label for the button * @param integer $page the page number * @param string $class the CSS class for the page button. * @param boolean $hidden whether this page button is visible * @param boolean $selected whether this page button is selected * @return string the generated button */ protected function createPageButton($label,$page,$class,$hidden,$selected) { if($hidden || $selected) $class.=' '.($hidden ? $this->hiddenPageCssClass : $this->selectedPageCssClass); if ($selected) { $result = "<span>" . ++$page . "</span>"; } else { $result = CHtml::link($label,$this->createPageUrl($page)); } return $result; } /** * @return array the begin and end pages that need to be displayed. */ protected function getPageRange() { $currentPage=$this->getCurrentPage(); $pageCount=$this->getPageCount(); /*$beginPage=max(0, $currentPage-(int)($this->maxButtonCount/2)); if(($endPage=$beginPage+$this->maxButtonCount-1)>=$pageCount) { $endPage=$pageCount-1; $beginPage=max(0,$endPage-$this->maxButtonCount+1); }*/ if($pageCount > $this->maxButtonCount){ if($currentPage > 4 && $currentPage < ($pageCount - 4)){ // print_r('a'); $beginPage = $currentPage - 2; $endPage = $currentPage + 2; $ellipsis = 'both'; }else{ $beginPage=max(1, $currentPage-(int)($this->maxButtonCount/2)); if($beginPage == 1){ $ellipsis = 'right'; }else{ $ellipsis = 'left'; } if(($endPage=$beginPage+$this->maxButtonCount-1)>=$pageCount) { // print_r('b'); $endPage=$pageCount-2; $beginPage=max(1,$endPage-$this->maxButtonCount+1); }elseif(($endPage=$beginPage+$this->maxButtonCount-1)>=$pageCount-2){ // print_r('c'); $endPage=$pageCount-2; } } }else{ $beginPage=max(1, $currentPage-(int)($this->maxButtonCount/2)); if(($endPage=$beginPage+$this->maxButtonCount-1)>=$pageCount) { $endPage=$pageCount-2; $beginPage=max(1,$endPage-$this->maxButtonCount+1); } } return array($beginPage,$endPage, $ellipsis); } /** * Registers the needed client scripts (mainly CSS file). */ public function registerClientScript() { if($this->cssFile!==false) self::registerCssFile($this->cssFile); } /** * Registers the needed CSS file. * @param string $url the CSS URL. If null, a default CSS URL will be used. */ public static function registerCssFile($url=null) { if($url===null) $url=CHtml::asset(Yii::getPathOfAlias('system.web.widgets.pagers.pager').'.css'); Yii::app()->getClientScript()->registerCssFile($url); } }
3、调用方式
在View里的相应widget，定义pager的class为自定义的分页器类名即可，参考：
$this->widget('zii.widgets.CListView', array( 'dataProvider'=>$dataProvider, 'itemView'=>'_view_t', 'pager'=>array( 'class'=>'MyPager', ) ));