How to populate Yii2 Autocomplete with AJAX call - autocomplete

Question

I am trying to switch to Yii2 from Yii 1.1. This was source attribute of TextAreaJuiAutoComplete widget
'source'=>"js:function(request, response) {
$.getJSON('".$url"', {
term: extractLast(request.term)
}, response);
}",
This is not working in Yii2 with yii\jui\AutoComplete anymore. Can anyone give me a hint what is the cause? Underlying JavaScript objects should be the same.
If I put following code it works, but I want to use ajax calls instead.
'source' => [ "c++", "java", "php", "coldfusion", "javascript", "asp", "ruby" ],

Answer 1

Try this:
use yii\web\JsExpression;
.....
.....
'source'=>new JsExpression("function(request, response) {
$.getJSON('".$url."', {
term: request.term
}, response);
}"),

Answer 2

Try this:
AutoComplete::widget([
'name'=>'myacfield',
'clientOptions' => [
'source' => Url::to(['autocomplete']),
'minLength'=>'2',
],
'options'=>[
'class' => 'form-control'
]
]);
But your AutoComplete action must return a one dimensional array like
...
$rs = Yii::$app->db->createCommand($sql)->queryAll();
$row_set = [];
foreach ($rs as $row)
{
$row_set[] = $row['name']; //build an array
}
echo json_encode($row_set); //format the array into json data

Answer 3

Examle with like.
Controller:
public function actionSearch($term)
{
\Yii::$app->response->format = \yii\web\Response::FORMAT_JSON;
$rs = Cure::find()->where(['like', 'name_uz', $term])->all();
if($rs !=null){
$row_set = [];
foreach ($rs as $row)
{
$row_set[] = $row->name_uz; //build an array
}
return $row_set;
}else{
false;
}
}
In view:
<? use yii\jui\AutoComplete;?>
<?= AutoComplete::widget([
'model' => $model,
'attribute' => 'country',
'options' => ['class' => 'form-control'],
'clientOptions' => [
'source' => Url::to(['cure/search']),
'minLength'=>'2',
],
]); ?>