PHP development framework Yii Framework tutorial (9) UI widget Widget overview

Like the usual application development framework, Yii Framework also provides a set of UI widgets (CWidget) to help programmers design user interfaces. The group is an instance of CWidget or its subclass. It is mainly used for presentation Components of data. Groups are often embedded in a view to produce some complex and independent user interface. For example, a calendar widget can be used to render a complex calendar interface. Widgets make user interfaces more reusable.

We can use a widget according to the following view script:

beginWidget('path.to.WidgetClass'); ?>

...The content body that may be obtained by the widget...
endWidget(); >or

widget ('path.to.WidgetClass'); ? >;

The latter is used for components that do not require any body content.

The widget can customize its performance through configuration. This is set by calling CBaseController::beginWidget or CBaseController::widget This is done by initializing the attribute values. For example, when using the CMaskedTextField widget, we want to specify the mask to be used. We do this by passing an array carrying the initialization values ​​of these properties. The key of the array here is the name of the attribute, and the value of the array is the value corresponding to the attribute of the small object. As shown below :

$this->widget('CMaskedTextField',array('mask'=>'99/99/9999'));?>继承 CWidget 并覆盖其init() 和 run() 方法,可以定义一个新的小物件：
class MyWidget extends
CWidget{public function init(){// 此方法会被 CController::beginWidget() 调用}public function run(){// 此方法会被 CController::endWidget() 调用}}

A widget can have its own view just like a controller. By default, the widget's view files are located under the views subdirectory of the directory containing the widget's class files. These views can be rendered by calling CWidget::render(), which is very similar to the controller. The only difference is that, The widget's view has no layout file support. In addition, $this in the widget view points to the widget instance rather than the controller instance.

In the previous article Yii Framework Development Concise Tutorial (8) Using FormModel, it was said that user submission events are processed through CController. By analogy with Windows desktop applications or ASP.Net, Yii View (HTML Form) Similar to WinForm or Asp.Net Page. The control class Controller is similar to the event processing (Code-Behind) class of Windows desktop applications or Asp.Net. Strictly speaking, it is not very appropriate to compare the View (HTML Form) in Yii to WinFrom in the Windows desktop or Asp.Net Page. In fact, the entire HTML (or body) of the view in Yii is equivalent to WinForm or Page. HTML Form is just a subclass of CWidget, corresponding to the CActiveForm UI component. In addition, Yii has built-in the following CWidget types:

## Among them, CJuiWidget (encapsulating JQuery) and CInputWidget are further divided into For:

The following tutorials will introduce the usage of UI widgets provided by Yii one by one. In addition to these built-in UI widgets, Yii also supports custom UI widgets.

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