require([
    'jquery',
    'mage/validation'
], function($){

    var dataForm = $('#form-validate');
    var ignore = null;

    dataForm.mage('validation', {
        ignore: ignore ? ':hidden:not(' + ignore + ')' : ':hidden'
    }).find('input:text').attr('autocomplete', 'off');

    $('button#my-button').click( function() { //can be replaced with any event
        dataForm.validation('isValid'); //validates form and returns boolean
    });
});

#form-validate – Replace with your form id

#my-button – Replace with your button id