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PHP.MVC template tag system (1)_PHP tutorial

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Jul 21, 2016 pm 04:12 PM

onesupplyLabeltemplateNowofsystem

    PHP.MVC的模板标签系统(PhpMVC_Tags)现在提供了3种类型的标签:包含指令,声明和表达式.
    包含指令能让我们将内容分隔为许多模块,比如:页眉,页脚或者内容.包含的页面可以是HTML,或者其他标签模板页.据个例子,下面的包含指令能用来包含一个页眉:

    声明允许我们在模板种声明一个页面级别的变量,或者甚至其他包含页面.一个声明看起来像以下代码:

    表达式标签允许我们在模板页中执行表达式.表达式的结果将被包含进模板页.以下表达式将被用来显示一个简单的字符串(salesAreaID),也可以找回框架配置类的属性:


    PHP.MVC beta 0.4.0引进了一个新配置类叫做ViewResourcesConfig.这个类能被用来定义能被用在VIEW资源(模板)中的全局参数,并且也能去配置模板标签系统,它将在下面显示.phpmvc-config.xml配置文件中的view-resources元素在下面的显示:
           appTitle    = "Flash Jacks' Sleek Tab Site"
       copyright   = "Copyright @ 2010 Flash Jack. All rights reserved."
       contactInfo = "flash.jack@jackshost.com"
       processTags = "true"
       compileAll = "true"
       className   = "MyViewResourcesConfig">

    模板页面处理使用模板标签系统能被结点来控制.首先我们能定义是模板标签系统编译所有模板页面还是只编译修改过的.其次,我们能定义模板标签系统是否真的要处理标签页面,处理标签页面在应用程序配置当中和配置之后很有用.下面单元显示的是将compileAll和processTags属性设置为真(总是处理标签页并且处理所有标签页):
       ...
   processTags = "true"
   compileAll = "true"
   ...


Action Dispatcher

PHP.MVC版本beta 0.4.0以上ActionDispatcher类用来负责使FormBean,Errors,Value(商务数据)和ViewResourcesConfig对象在我们的VIEW(模板)中可以使用.
在检查模板标签系统之前我们应该快速的看一下ActionObjects和ViewResourcesConfig类,当在使用标准的ActionDispatcher时.

ActionObjects

    ActionDispatcher使一些对象在我们所使用的模板页面中的应用程序VIEW资源可用.3种标准的ActionObjects为:FormBean,Errors,和Value(商务数据)对象.
    一下表格显示了在FormAction和Action类中如何使用FormBean,Errors和Value对象:
    Saving ActionObjects in ActionForm Classes
ActionErrors $this->saveErrors($request, $actionErrors)
FormBeans $this->saveFormBean($request, $this)
ValueObjects $this->saveValueObject($request, $valueObject)

Saving ActionObjects in Action Classes
ActionErrors $this->saveErrors($request, $actionErrors)
FormBeans $this->saveFormBean($request, $form)
ValueObjects $this->saveValueObject($request, $valueObject)

Retrieving ActionObjects in View Resources (Templates)
ActionErrors $errors->getItemString('logon_username_reqd')
FormBeans $form->username
ValueObjects $data->salesNorth

一个ActionObject将被初始化为NULL如果对象没有在之前被创建和保存.要想得到ActionObjects的详细信息请看这里:http://www.phpmvc.net/docs/guides/guidesIdx.php?doc=action-objects

View Resources

ActionDispatcher can also expose ViewResourcesConfig objects to our template pages. The ViewResourcesConfig object is configured by the element in the phpmvc-config.xml configuration file. If the ViewResourcesConfig object has not been configured, then a new Instances will use the default ViewResourcesConfig class properties.
The following code shows how to access the ViewResourcesConfig property in our HTML header template using expressions from the template tag system:

Configure Action Dispatcher

ActionDispatcher is the default PHP.MVC (in beta 0.4.0 and above) Dispatcher class. This Action Dispatcher is included in the framework and will be used by default unless we define a class to replace the Dispatcher class. In the next section we will We will see how to configure our application to use an alternative class - the TagActionDispatcher class.

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