How to display just a header error message?

Question

Yii

Good afternoon,
I can’t find how to display the header error message using yii2/. (but don't summarize)
For example - There are some errors in the form..
I try like this
$form->error($model, 'text_error');

Answer 1

Methods getFirstError, getFirstErrors, hasErrors
ajax validation and validation on the client:

$('#contact-form').on('beforeSubmit', function (e) {
    if (!confirm("Everything is correct. Submit?")) {
        return false;
    }
    return true;
});

About validation on the client in yii2
Issue on github with several solutions