init

Alert.php

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+<?php
+namespace edoriansyah\alert;
+use Yii;
+class Alert extends \yii\bootstrap\Widget
+{
+   public function init()
+   {
+      parent::init();
+      if(Yii::$app->session->hasFlash('success')){
+         echo '<div class="alert alert-success">';
+         echo Yii::$app->session->getFlash('success');
+         echo '</div>';
+      }else if (Yii::$app->session->hasFlash('error')){
+         echo '<div class="alert alert-danger">';
+         echo Yii::$app->session->getFlash('error');
+         echo '</div>';
+      }
+   }
+}

README.md

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+yii2-alert-nf
+=============
+Widget Alert twitter bootstrap for Yii Framework 2
+
+Installation
+------------
+
+The preferred way to install this extension is through [composer](http://getcomposer.org/download/).
+
+Either run
+
+```
+php composer.phar require --prefer-dist edoriansyah/yii2-alert-nf "*"
+```
+
+or add
+
+```
+"edoriansyah/yii2-alert-nf": "*"
+```
+
+to the require section of your `composer.json` file.
+
+
+Usage
+-----
+
+Once the extension is installed, simply use it in your code by  :
+
+```php
+<?= \edoriansyah\alert\AutoloadExample::widget(); ?>```

composer.json

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+{
+    "name": "edoriansyah/yii2-alert-nf",
+    "description": "Widget Alert twitter bootstrap for Yii Framework 2",
+    "type": "yii2-extension",
+    "keywords": ["yii2","extension","alert"],
+    "license": "MIT",
+    "authors": [
+        {
+            "name": "Edo Riansyah",
+            "email": "[email protected]"
+        }
+    ],
+    "require": {
+        "yiisoft/yii2": "*"
+    },
+    "autoload": {
+        "psr-4": {
+            "edoriansyah\\alert\\": ""
+        }
+    }
+}