創(chuàng)建自定義小部件需繼承 yii\base\Widget 類并實(shí)現(xiàn) init() 和 run() 方法。2. 將類文件放在 @app/widgets/ 目錄下。3. 在視圖中通過 widget() 或 begin() 和 end() 語法使用。4. 復(fù)雜輸出可通過 render() 方法渲染視圖模板。5. 需要 CSS/JS 時(shí)創(chuàng)建資源包并在 run() 中注冊。
To create a custom widget in Yii, you need to extend the yii\base\Widget class and implement the init() and/or run() methods. Widgets are reusable components that can be embedded in views to generate complex or repeated UI elements. Here’s how to do it step by step.
Create the Widget Class
Place your widget class in the widgets directory of your application (e.g., @app/widgets/MyWidget.php). The class should extend Widget.
Example:
namespace app\widgets;use yii\base\Widget;
use yii\helpers\Html;
class MyWidget extends Widget
{
????public $message;
????public function init()
????{
????????parent::init();
????????if (\$this->message === null) {
????????????\$this->message = 'Default message';
????????}
????}
????public function run()
????{
????????return Html::encode(\$this->message);
????}
}
?>
Using the Widget in a View
Once defined, use the widget in any view file with the begin() and end() syntax for widgets with content, or just widget() for simple output.
Example (simple usage):
use app\widgets\MyWidget;echo MyWidget::widget([
????'message' => 'Hello, world!',
]);
?>
If your widget wraps content (like a panel or box), use the following pattern:
MyWidget::begin([????'message' => 'Welcome!',
]);
echo 'This content goes inside the widget.';
MyWidget::end();
?>
In that case, you can capture the content in the run() method using ob_get_clean() or manage it via View::beginBody() and similar mechanisms.
Rendering a View Template
For more complex output, render a view file inside the widget using the render() method.
Update the run() method:
public function run(){
????return \$this->render('my-widget-view', [
????????'message' => \$this->message,
????]);
}
Create the view file in @app/widgets/views/my-widget-view.php. The widget will automatically look for views in its views subdirectory.
Registering Assets (CSS/JS)
If your widget needs JavaScript or CSS, create an asset bundle and register it inside the widget.
Example:
use app\assets\MyWidgetAsset;public function run()
{
????MyWidgetAsset::register(\$this->view);
????return \$this->render('my-widget-view', [
????????'message' => \$this->message,
????]);
}
Basically, that’s how you create and use a custom widget in Yii. It’s a clean way to encapsulate reusable UI logic.
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