Detailview with delete button working

controller

<?php

namespace app\controllers;

use Yii;
use app\models\Test;
use app\models\TestSearch;
use yii\web\Controller;
use yii\web\NotFoundHttpException;
use yii\filters\VerbFilter;
use yii\base\InvalidCallException;
use yii\helpers\Json;
use yii\helpers\Url;


/**
 * TestController implements the CRUD actions for Test model.
 */
class TestController extends Controller
{
    public function behaviors()
    {
        return [
            'verbs' => [
                'class' => VerbFilter::className(),
                'actions' => [
                    'delete' => ['post'],
                ],
            ],
        ];
    }

    /**
     * Lists all Test models.
     * @return mixed
     */
    public function actionIndex()
    {
        $searchModel = new TestSearch;
        $dataProvider = $searchModel->search(Yii::$app->request->getQueryParams());

        return $this->render('index', [
            'dataProvider' => $dataProvider,
            'searchModel' => $searchModel,
        ]);
    }

    /**
     * Displays a single Test model.
     * @param integer $id
     * @return mixed
     */
    public function actionView($id) {
    	$model=$this->findModel($id);
    	 
    	if ($model->load(Yii::$app->request->post()) && $model->save()) {
    		Yii::$app->session->setFlash('kv-detail-success', 'Saved record successfully');
    		return $this->redirect(['view', 'id'=>$model->id]);
    	} else {
    		return $this->render('view', ['model'=>$model]);
    	}
    }
    
    public function actionView_from_gii($id)
    {
    	$model = $this->findModel($id);
    
    	if ($model->load(Yii::$app->request->post()) && $model->save()) {
    		return $this->redirect(['view', 'id' => $model->id]);
    	} else {
    		return $this->render('view', ['model' => $model]);
    	}
    }
    
    /**
     * Creates a new Test model.
     * If creation is successful, the browser will be redirected to the 'view' page.
     * @return mixed
     */
    public function actionCreate()
    {
        $model = new Test;

        if ($model->load(Yii::$app->request->post()) && $model->save()) {
            return $this->redirect(['view', 'id' => $model->id]);
        } else {
            return $this->render('create', [
                'model' => $model,
            ]);
        }
    }

    /**
     * Updates an existing Test model.
     * If update is successful, the browser will be redirected to the 'view' page.
     * @param integer $id
     * @return mixed
     */
    public function actionUpdate($id)
    {
        $model = $this->findModel($id);

        if ($model->load(Yii::$app->request->post()) && $model->save()) {
            return $this->redirect(['view', 'id' => $model->id]);
        } else {
            return $this->render('update', [
                'model' => $model,
            ]);
        }
    }

    /**
     * Deletes an existing Test model.
     * If deletion is successful, the browser will be redirected to the 'index' page.
     * @param integer $id
     * @return mixed
     */
    public function actionDelete($id) {
    	$post = Yii::$app->request->post();
    	Yii::trace('Entering delete action');
    	if (Yii::$app->request->isAjax && isset($post['custom_param'])) {
    		if ($this->findModel($id)->delete()) {
    			echo Json::encode([
    				'success' => true,
    				'messages' => [
    					'kv-detail-info' => 'The record # ' . $id . ' was successfully deleted. <a href="' .
    					Url::to(['/test']) . '" class="btn btn-sm btn-info">' .
    					'<i class="glyphicon glyphicon-hand-right"></i>  Click here</a> to proceed.'
    				]
    			]);
    		} else {
    			echo Json::encode([
   					'success' => false,
   					'messages' => [
						'kv-detail-error' => 'Cannot delete the record # ' . $id . '.'
   					]
    			]);
    		}
    		return;
    	} elseif (Yii::$app->request->post()) {
    		$this->findModel($id)->delete();
    		return $this->redirect(['index']);
    	}
    	throw new InvalidCallException("You are not allowed to do this operation. Contact the administrator.");
    }

    /**
     * Finds the Test model based on its primary key value.
     * If the model is not found, a 404 HTTP exception will be thrown.
     * @param integer $id
     * @return Test the loaded model
     * @throws NotFoundHttpException if the model cannot be found
     */
    protected function findModel($id)
    {
        if (($model = Test::findOne($id)) !== null) {
            return $model;
        } else {
            throw new NotFoundHttpException('The requested page does not exist.');
        }
    }
}

index

<?php

use yii\helpers\Html;
use kartik\grid\GridView;
use yii\widgets\Pjax;

/**
 * @var yii\web\View $this
 * @var yii\data\ActiveDataProvider $dataProvider
 * @var app\models\TestSearch $searchModel
 */

$this->title = 'Tests';
$this->params['breadcrumbs'][] = $this->title;
?>
<div class="test-index">
    <div class="page-header">
            <h1><?= Html::encode($this->title) ?></h1>
    </div>
    <?php 

    <?php Pjax::begin(); echo GridView::widget([
        'dataProvider' => $dataProvider,
        'filterModel' => $searchModel,
        'columns' => [
            ['class' => 'yii\grid\SerialColumn'],

            'id',
            'name',

            [
                'class' => 'yii\grid\ActionColumn',
                'buttons' => [
                'update' => function ($url, $model) {
                                    return Html::a('<span class="glyphicon glyphicon-pencil"></span>', Yii::$app->urlManager->createUrl(['test/view','id' => $model->id,'edit'=>'t']), [
                                                    'title' => Yii::t('yii', 'Edit'),
                                                  ]);}

                ],
            ],
        ],
        'responsive'=>true,
        'hover'=>true,
        'condensed'=>true,
        'floatHeader'=>true,




        'panel' => [
            'heading'=>'<h3 class="panel-title"><i class="glyphicon glyphicon-th-list"></i> '.Html::encode($this->title).' </h3>',
            'type'=>'info',
            'before'=>Html::a('<i class="glyphicon glyphicon-plus"></i> Add', ['create'], ['class' => 'btn btn-success']),                                                                                                                                                          'after'=>Html::a('<i class="glyphicon glyphicon-repeat"></i> Reset List', ['index'], ['class' => 'btn btn-info']),
            'showFooter'=>false
        ],
    ]); Pjax::end(); ?>

</div>

model

<?php

namespace app\models;

use Yii;

/**
 * This is the model class for table "Test".
 *
 * @property integer $id
 * @property string $name
 */
class Test extends \yii\db\ActiveRecord
{
    /**
     * @inheritdoc
     */
    public static function tableName()
    {
        return 'Test';
    }

    /**
     * @inheritdoc
     */
    public function rules()
    {
        return [
            [['name'], 'string', 'max' => 20]
        ];
    }

    /**
     * @inheritdoc
     */
    public function attributeLabels()
    {
        return [
            'id' => 'ID',
            'name' => 'Name',
        ];
    }
}

test_create

CREATE TABLE `Test`
(
   id     int(10) UNSIGNED,
   name   varchar(20)
)

view

<?php

use yii\helpers\Html;
use kartik\detail\DetailView;
use yii\helpers\Url;


/**
 * @var yii\web\View $this
 * @var app\models\Test $model
 */

$this->title = $model->name;
$this->params['breadcrumbs'][] = ['label' => 'Tests', 'url' => ['index']];
$this->params['breadcrumbs'][] = $this->title;
?>
<div class="test-view">
    <div class="page-header">
        <h1><?= Html::encode($this->title) ?></h1>
    </div>

    <?= DetailView::widget([
            'model' => $model,
            'condensed'=>false,
            'hover'=>true,
            'mode'=>Yii::$app->request->get('edit')=='t' ? DetailView::MODE_EDIT : DetailView::MODE_VIEW,
            'panel'=>[
            'heading'=>$this->title,
            'type'=>DetailView::TYPE_INFO,
        ],
        'attributes' => [
            'id',
            'name',
        ],
    	'deleteOptions'=>[
			'params' => ['custom_param'=>true],
        	'url'=>['delete', 'id' => $model->id],
    	],
    	    ]) ?>

</div>

A few corrections on the Krajee's Webtip http://webtips.krajee.com/viewing-updating-model-data-yii2-detail-view/
Also posted on the forum: http://www.yiiframework.com/forum/index.php/topic/63953-kartiks-detailview-not-deleting/page__gopid__281446#entry281446

Hey Abassanini

Thanks for the heads up!