add events

Author: lesha724

README.md

@@ -28,4 +28,21 @@ Usage
 Once the extension is installed, simply use it in your code by  :
 
 ```php
-<?= \lesha724\bootstraptree\TreeView::widget(); ?>```
+<?= \lesha724\bootstraptree\TreeView::widget([
+    'htmlOptions'=>[
+                'id'=>'treeview-tabs'
+    ],
+    'options'=>[
+        'data'=>$items,
+        'enableLinks'=>true,
+        'showTags'=>true,
+        'levels'=>3
+    ],
+    'events'=>[
+        'onNodeSelected'=>'function(event, data) {
+            // Your logic goes here
+            alert(data.href);
+        }'
+    ]
+]); ?>
+```

TreeView.php

@@ -3,6 +3,7 @@
 namespace lesha724\bootstraptree;
 use yii\helpers\Html;
 use yii\helpers\Json;
+use yii\web\JsExpression;
 use yii\web\View;
 
 /**
@@ -20,6 +21,11 @@ class TreeView extends \yii\base\Widget
      */
     public $options=[];
 
+    /**
+     * @var array additional options that can be passed to the constructor of the treeview js object.
+     */
+    public $events=[];
+
     protected $_id;
 
     public function init(){
@@ -38,12 +44,26 @@ public function run()
         $view = $this->getView();
         TreeViewAsset::register($view);
 
-        $options=$this->options===[]?'{}' : Json::encode($this->options);
+        $options = $this->_getEventsOptions();
+        $options=$options===[]?'{}' : Json::encode($options);
         $view->registerJs('$("#' . $this->_id . '").treeview( ' .$options .')', View::POS_READY);
 
         return $this->_runWidget();
     }
 
+    /**
+     * @return array the javascript options
+     */
+    protected function _getEventsOptions()
+    {
+        $options=$this->options;
+        foreach($this->events as $key=>$event)
+        {
+            $options[$key]=$_function = new JsExpression($event);
+        }
+        return $options;
+    }
+
     /**
      * Вывод виджета
      * @return string html widget