In Yii, widgets are used to implement component multiplexing by encapsulating complex view logic. 1. Use the widget() method to call built-in widgets, such as LinkPager for pagination, and ActiveForm for creating model binding forms; 2. Common widgets include GridView to display table data, DetailView to display model details, Menu build navigation menu; 3. You can create custom widgets by inheriting yii\base\Widget, implement the run() method and define properties to enhance reusability, as shown in the HelloWidget example. Mastering these core methods can improve view development efficiency.
In Yii, widgets are reusable components that help you encapsulate complex view logic into self-contained units. Using them in views is straightforward once you understand the basic structure and how to call them.
Basic Widget Usage
Widgets in Yii are typically called using the widget() method inside a view file. The general syntax looks like this:
<?= \yii\widgets\WidgetName::widget([
'option1' => 'value1',
'option2' => 'value2',
]) ?> Each widget has its own set of configuration options. For example, if you're using the built-in LinkPager widget for pagination, it might look like:
<?= \yii\widgets\LinkPager::widget([
'pagination' => $pagination,
]) ?> Make sure to pass the correct parameters — in this case, a Pagination object prepared in your controller.
Commonly Used Widgets and What They Do
Yii comes with several useful widgets out of the box. Here are a few commonly used ones and their purposes:
- ActiveForm : Helps build forms tied to models.
- GridView : Displays tabular data with sorting, filtering, and pagination.
- DetailView : Shows details of a single model record.
- Menu : Renders multi-level navigation menus.
- LinkPager / Pagination : Handles page navigation for paginated content.
For example, using ActiveForm to create a login form:
<?php $form = \yii\widgets\ActiveForm::begin(); ?> <?= $form->field($model, 'username') ?> <?= $form->field($model, 'password')->passwordInput() ?> <button type="submit">Login</button> <?php \yii\widgets\ActiveForm::end(); ?>
This automatically handles form submission, model binding, and error display based on validation rules.
Creating Your Own Widget (Optional but Useful)
If you find yourself repeating certain UI elements or logic across multiple views, consider creating a custom widget.
Here's a quick outline of what to do:
- Create a new class extending
yii\base\Widget. - Override the
run()method to return the HTML/output. - Optionally, add configurable properties via public variables or constructor/configurable options.
Example:
namespace app\widgets;
use yii\base\Widget;
class HelloWidget extends Widget
{
public $message = 'Hello there';
public function run()
{
return "<div class=\"hello\">{$this->message}</div>";
}
}Then in your view:
<?= \app\widgets\HelloWidget::widget(['message' => 'Welcome back!']) ?>
It's a clean way to reuse components without duplicating code.
That's the core of working with widgets in Yii views. You don't always need to build your own — using built-in widgets effectively can save a lot of time. But knowing how to create one gives you more flexibility when needed.
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