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HomeBackend DevelopmentPHP TutorialYii核心组件AssetManager原理分析_PHP

本文我们通过yii自带的demo-blog程序来分析Yii核心组件AssetManager,他可以自动加载css和javascript,并且只需要一句代码即可。具体分析如下:

打开blog的首页,会看到如下的引入js的html代码:

代码如下:




这些js文件的路径都在assets文件夹下,assets后面跟着一个显然经过hash的文件夹路径,同属于jq的js代码的路径相同,这段代码从何而来呢?

直接看view文件看不到任何引入js的代码,因此应该是使用widget引入的:

代码如下:

$this->widget('zii.widgets.CListView', array(
'dataProvider'=>$dataProvider,
'itemView'=>'_view',
'template'=>"{items}n{pager}",
));
?>

这个widget也是yii自带的zii扩展,于是乎我们可以找到zii的CListView代码,而CListView又是继承CBaseListView,因此先看CBaseListView的run方法:

代码如下:

public function run()
{
$this->registerClientScript();
echo CHtml::openTag($this->tagName,$this->htmlOptions)."n";
$this->renderKeys();
$this->renderContent();
echo CHtml::closeTag($this->tagName);
}

请注意第一个方法registerClientScript,这个方法是在CListView中实现的:

代码如下:

public function registerClientScript()
{
……
$cs=Yii::app()->getClientScript();
$cs->registerCoreScript('jquery');
$cs->registerCoreScript('bbq');
……
}

看到jquery和bbp似乎离真相近了些,接下来我们看CClientScript::registerCoreScript方法:

代码如下:

public function registerCoreScript($name)
{
$this->_hasScripts=true;
$this->_coreScripts[$name]=$name;
$params=func_get_args();
$this->recordCachingAction('clientScript','registerCoreScript',$params);
}

这里其实主要是记录了最终页面要render的js,而实际生成render的url是通过getCoreScriptUrl方法:

代码如下:

public function getCoreScriptUrl()
{
if($this->_baseUrl!==null)
return $this->_baseUrl;
else
return $this->_baseUrl=Yii::app()->getAssetManager()->publish(YII_PATH.'/web/js/source');
}

接下来我们看看publish的具体过程:

代码如下:

public function publish($path,$hashByName=false,$level=-1,$forceCopy=false)
{
if(is_file($src))
{
$dir=$this->hash($hashByName ? basename($src) : dirname($src));
$fileName=basename($src);
……
else if(is_dir($src))
{
$dir=$this->hash($hashByName ? basename($src) : $src);
$dstDir=$this->getBasePath().DIRECTORY_SEPARATOR.$dir;
……
}

这里通过对路径做了hash处理,因此我们看到的路径是不规则的,而由于jq系列的js代码均在同一路径下(都在framework/web/js/source下),所以hash值是相同的。

另外,除了如上所述,CAssetManager使得多个模块可以复用相同的代码制外,使用CAssetManager的另外一个好处是安全隔离,将真实的代码放在受保护的路径下,按需加载。

希望本文所述对大家基于yii框架的PHP程序设计有所帮助。

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