Yii2 activeform ajax submit and validation

Question

Currently to achieve ajax submit and validation at the same time. I'm using custom function like:

    $('.edit_form').submit(function (e) {
        e.preventDefault();
        var form = $(this);
        var formData = $(this).serialize();
        if (form.find('.has-error').length) {
            return false;
        }

        $.ajax({
            url: form.attr("action"),
            type: form.attr("method"),
            data: formData,
            success: function (data) {
                 ...
            },
            error: function () {
                alert("Something went wrong");
            }
        });

    });

And here is php side, for validation my config looks like that:

$form = ActiveForm::begin([
    'id' => "some_form",
    'action' => ['user/edit'],
    'options' => ['class' => 'edit_form'],
    'enableAjaxValidation' => false,
    'enableClientValidation' => true,
]); ?>

I'm sure that It's not the best way to achieve what I need. Especially this part that I use for preventing for submission in case of validation error:

    if (form.find('.has-error').length) {
        return false;
    }

Any suggestions? How to achieve ajax submission and validation properly using Yii 2's inbuilt settings?

Answer 1

Use beforeSubmit event instead of submit, the beforeSubmit will only be triggered once the form passes the validation.

$('form').on('beforeSubmit', function(e) {
    var form = $(this);
    var formData = form.serialize();
    $.ajax({
        url: form.attr("action"),
        type: form.attr("method"),
        data: formData,
        success: function (data) {
             ...
        },
        error: function () {
            alert("Something went wrong");
        }
    });
}).on('submit', function(e){
    e.preventDefault();
});

Answer 2

Here I've find some interesting javascript-side validation tricks

So, a javascript submit button can be as:

$('body').on('click', '#submit', function(e) {
  e.preventDefault();
  var yiiform = $('#my-form');
  $.ajax({
    type: yiiform.attr('method'),
      url: yiiform.attr('action'),
      data: yiiform.serializeArray(),
      success: function(data) {
        if(data.success == 'true') {
          window.location.href = 'http://my.success.page';
        } else {
          // here there is (maybe) the right way to trigger errors
          $.each(data, function(key, val) {
            yiiform.yiiActiveForm('updateAttribute', key, [val]);
          });
        }
      }
  });
}

triggered by:

<?= Button::widget([
    'label' => Yii::t('app', 'Submit'),
     'options' => [
        'id'=>'submit',
        'class' => 'btn btn-primary pull-right',
     ]]);?>

And the action controller will reply with:

...
if ($model->load(Yii::$app->request->post())) {
    Yii::$app->response->format = Response::FORMAT_JSON;
    if($model->save()) {
        return ['success'=>'true'];
    } else {
        return ActiveForm::validate($model);
    }
}
...

Details about ActiveForm::validate() can be found here