Ajax form submitting twice with Yii 2

You may need to change your code like below:

$('#company_form').submit(function(e) {    e.preventDefault();    e.stopImmediatePropagation();    signup('company');    return false;});

javascript php ajax yii yii2

Solution common

Next JS will works with any state of 'enableClientValidation':

$('#company_form').on('beforeSubmit', function (e) {    signup('company');    return false;});