Added `Widget::autoIdPrefix` to support prefixing automatically generated widget IDs

framework/CHANGELOG.md

@@ -12,7 +12,7 @@ Yii Framework 2 Change Log
 - Enh #1437: Added ListView::viewParams (qiangxue)
 - Enh #1469: ActiveRecord::find() now works with default conditions (default scope) applied by createQuery (cebe)
 - Enh: Added `favicon.ico` and `robots.txt` to defauly application templates (samdark)
-- Enh: Widget IDs are now always unique no matter if it's the same request or new one (samdark)
+- Enh: Added `Widget::autoIdPrefix` to support prefixing automatically generated widget IDs (qiangxue)
 - New #1438: [MongoDB integration](https://github.com/yiisoft/yii2-mongodb) ActiveRecord and Query (klimov-paul)
 
 2.0.0 alpha, December 1, 2013

framework/yii/base/Widget.php

@@ -25,6 +25,17 @@ use ReflectionClass;
 class Widget extends Component implements ViewContextInterface
 {
 	/**
+	 * @var integer a counter used to generate [[id]] for widgets.
+	 * @internal
+	 */
+	public static $counter = 0;
+	/**
+	 * @var string the prefix to the automatically generated widget IDs.
+	 * @see [[getId()]]
+	 */
+	public static $autoIdPrefix = 'w';
+
+	/**
 	 * @var Widget[] the widgets that are currently being rendered (not ended). This property
 	 * is maintained by [[begin()]] and [[end()]] methods.
 	 * @internal
@@ -96,7 +107,7 @@ class Widget extends Component implements ViewContextInterface
 	public function getId($autoGenerate = true)
 	{
 		if ($autoGenerate && $this->_id === null) {
-			$this->_id = 'w-' . str_replace('.', '-', uniqid('', true));
+			$this->_id = self::$autoIdPrefix . self::$counter++;
 		}
 		return $this->_id;
 	}