Fixes #13996: Added yii\web\View::registerJsVar() method that allows registering JavaScript variables

framework/CHANGELOG.md

@@ -4,6 +4,7 @@ Yii Framework 2 Change Log
 2.0.14 under development
 ------------------------
 
+- Enh #13996: Added `yii\web\View::registerJsVar()` method that allows registering JavaScript variables (Eseperio, samdark)
 - Enh #9771: Assign hidden input with its own set of HTML options via `$hiddenOptions` in activeFileInput `$options` (HanafiAhmat)
 - Bug #15536: Fixed `yii\widgets\ActiveForm::init()` for call `parent::init()` (panchenkodv)
 - Enh #14806: Added $placeFooterAfterBody option for GridView (terehru)

framework/web/View.php

@@ -516,6 +516,31 @@ class View extends \yii\base\View
         }
     }
 
+    /**
+     * Registers a JS code block defining a variable. The name of variable will be
+     * used as key, preventing duplicated variable names.
+     *
+     * @param string $name Name of the variable
+     * @param array|string $value Value of the variable
+     * @param int $position the position in a page at which the JavaScript variable should be inserted.
+     * The possible values are:
+     *
+     * - [[POS_HEAD]]: in the head section. This is the default value.
+     * - [[POS_BEGIN]]: at the beginning of the body section.
+     * - [[POS_END]]: at the end of the body section.
+     * - [[POS_LOAD]]: enclosed within jQuery(window).load().
+     *   Note that by using this position, the method will automatically register the jQuery js file.
+     * - [[POS_READY]]: enclosed within jQuery(document).ready().
+     *   Note that by using this position, the method will automatically register the jQuery js file.
+     *
+     * @since 2.0.14
+     */
+    public function registerJsVar($name, $value, $position = self::POS_HEAD)
+    {
+        $js = sprintf('var %s = %s;', $name, \yii\helpers\Json::htmlEncode($value));
+        $this->registerJs($js, $position, $name);
+    }
+
     /**
      * Renders the content to be inserted in the head section.
      * The content is rendered using the registered meta tags, link tags, CSS/JS code blocks and files.

tests/framework/web/ViewTest.php

@@ -20,6 +20,31 @@ class ViewTest extends TestCase
     {
         parent::setUp();
     }
+    
+    public function testRegisterJsVar()
+    {
+        $this->mockWebApplication([
+            'components' => [
+                'request' => [
+                    'scriptFile' => __DIR__ . '/baseUrl/index.php',
+                    'scriptUrl' => '/baseUrl/index.php',
+                ],
+            ],
+        ]);
+
+        $view = new View();
+        $view->registerJsVar('username', 'samdark');
+        $html = $view->render('@yiiunit/data/views/layout.php', ['content' => 'content']);
+        $this->assertContains('<script type="text/javascript">var username = "samdark";</script></head>', $html);
+        
+        $view = new View();
+        $view->registerJsVar('objectTest', [
+            'number' => 42,
+            'question' => 'Unknown',
+        ]);
+        $html = $view->render('@yiiunit/data/views/layout.php', ['content' => 'content']);
+        $this->assertContains('<script type="text/javascript">var objectTest = {"number":42,"question":"Unknown"};</script></head>', $html);
+    }
 
     public function testRegisterJsFileWithAlias()
     {