Selected Value is not showing in Kartik Select2 multiple select - yii2

Question

This is my view file:
<?php
$data = array();
echo '<label class="control-label">Attribute Group Name</label>';
echo Select2::widget([
'name' => 'attribute_grp_name',
'data' => $attribute_group_name, // initial value
'options' => ['placeholder' => 'Please Enter Attribute Group Name', 'multiple' => true],
'pluginOptions' => [
'attribute_grp_name' => true,
'maximumInputLength' => 100,
],
]);
?>
In my view here selected data is not showing.
This is my controller for create and update function:
public function actionCreate()
{
$model = new AttributeSet();
$attribute_group = AttributeGroupLang::find()->select('*')->all();
$attribute_group_name = ArrayHelper::map($attribute_group, 'id_attribute_group', 'name');
if ($model->load(Yii::$app->request->post()) && $model->save()) {
$post_array = Yii::$app->request->post();
foreach ($post_array['attribute_grp_name'] as $key => $value) {
$attribute_set_group_combination = new AttributeSetGroupCombination();
$attribute_set_group_combination->id_attribute_set = $model->id_attribute_set;
$attribute_set_group_combination->id_attribute_group = $value;
$attribute_set_group_combination->save(false);
}
return $this->redirect(['view', 'id' => $model->id_attribute_set]);
} else {
return $this->render('create', [
'model' => $model,
'attribute_group_name' => $attribute_group_name,
]);
}
}
This is update function:
public function actionUpdate($id)
{
$model = $this->findModel($id);
$attribute_set_group_combination = AttributeSetGroupCombination::find()->where(['id_attribute_set' => $id])->all();
if ($model->load(Yii::$app->request->post()) && $model->save()) {
$post_array = Yii::$app->request->post();
if(!empty($post_array['attribute_grp_name'])){
AttributeSetGroupCombination::deleteAll('id_attribute_set = '.$id);
foreach ($post_array['attribute_grp_name'] as $key => $value) {
$attribute_set_group_combination = new AttributeSetGroupCombination();
$attribute_set_group_combination->id_attribute_set = $model->id_attribute_set;
$attribute_set_group_combination->id_attribute_group = $value;
$attribute_set_group_combination->save(false);
}
}
return $this->redirect(['view', 'id' => $model->id_attribute_set]);
} else {
return $this->render('update', [
'model' => $model,
'attribute_set_group_combination' => $attribute_set_group_combination,
'attribute_group_name' => $this->getExistAttrSet($id),
]);
}
}
public function getExistAttrSet($id){
$query = new Query;
$query->select(['attribute_group_lang.name AS attribute_group_name','attribute_group_lang.id_attribute_group'])
->from('attribute_set_group_combination')
->join('LEFT OUTER JOIN', 'attribute_set', 'attribute_set.id_attribute_set =attribute_set_group_combination.id_attribute_set')
->join('LEFT OUTER JOIN', 'attribute_group_lang', 'attribute_group_lang.id_attribute_group =attribute_set_group_combination.id_attribute_group')
->where('attribute_set.id_attribute_set='.$id)
->all();
$command = $query->createCommand();
$model = $command->queryAll();
$data = array();
foreach ($model as $attrsetlist[]) {
$data = ArrayHelper::map($attrsetlist, 'id_attribute_group', 'attribute_group_name');
}
return $data;
}
Can anyone help me that how can i show the selected value in the multiple select field.

Answer 1

You just need to pass in model value:
<?php
echo kartik\select2\Select2::widget([
'name' => 'some_field_name',
// ----------------------
'value' => 'a',
//'value' => ['a', 'b'],
//'value' => $model->some_value,
// ----------------------
'data' => ['a'=>'a', 'b'=>'b', 'c'=>'c'],
'options' => ['placeholder' => 'Select menu items ...', ],
]);
?>