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 style='background:#a3a3a3'><上一?</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'){
$buttons[] = "<span style='background:#a3a3a3'>...</span>";
}
for($i=$beginPage;$i<=$endPage;++$i){
if($ellipsis == 'left' && $i == $beginPage){
$buttons[] = "<span style='background:#a3a3a3'>...</span>";
}
$buttons[]=$this->createPageButton($i+1,$i,$this->internalPageCssClass,false,$i==$currentPage);
if($ellipsis == 'right' && $i == $endPage){
$buttons[] = "<span style='background:#a3a3a3'>...</span>";
}
}
if($ellipsis == 'both'){
$buttons[] = "<span style='background:#a3a3a3'>...</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 style='background:#a3a3a3'>下一?></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',
)
));
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