Yii2-onsubmit事件被激发两次

我正在尝试正确地设置submit事件(onsubmit设置为内联),但它将被触发两次,这不是期望的行为。

我的 活性形式 代码:

<?php

use app\models\Countries;
use app\models\States;
use yii\bootstrap\ActiveForm;
use yii\helpers\ArrayHelper;
use yii\helpers\Html;

$form = ActiveForm::begin(
    [
        'action'  => 'user-default-shipping/create',
        'options' => [
            'onsubmit' => 'Address.createDefault(event, this)'
        ]

    ]
);

if ($model->id)
    echo Html::activeHiddenInput($model, 'id');

echo $form->field($model, 'city')->textInput();

echo $form->field($model, 'address')->textInput();

echo $form->field($model, 'zip')->input('text');

echo $form->field($model, 'country_id')
    ->dropDownList(ArrayHelper::map(Countries::find()->all(), 'country_id', 'country_name'),
        ['role' => 'countries']
    )->hint('Choose your country.');

echo $form->field($model, 'state_id')
    ->dropDownList(ArrayHelper::map(States::find()->all(), 'state_id', 'state_name'),
        [
            'role' => 'states'
        ]
    )->hint('Choose your state.');

?>

    <div class="form-group">
        <button type="submit" class="btn btn-green">Submit</button>
    </div>

<?php ActiveForm::end(); ?>

JS代码:

const Address = {

    createDefault(event, form) {
        event.preventDefault();

        console.log(form);

    }

}

有没有办法防止这种行为?