main.js

$.nette.init(function (rh) {
	$(this.linkSelector).off('click.nette', rh).on('click.nette', rh);
	$(this.formSelector).off('submit.nette', rh).on('submit.nette', rh);
	$(this.buttonSelector).off('click.nette', rh).on('click.nette', rh);
}, {
	linkSelector: 'a.ajax',
	formSelector: 'form.ajax',
	buttonSelector: 'input.ajax[type="submit"], button.ajax[type="submit"], input.ajax[type="image"]'
});

script.js

$.nette.ext('disable-submit', {
	prepare: function (settings) {
		if (settings.nette.isForm) {
			settings.nette.el.attr('data-ajax-pass', 'true');
		}
	},
	complete: function () {
		if (this.submit) {
			this.submit.attr('disabled', false);
		}
		delete this.submit;
	},
	load: function () {
		var that = this;
		$('form').on('click', 'input[type="submit"]', function () {
			that.submit = $(this);
		});
		$('form').on('submit', function () {
			if (that.submit) {
				that.submit.attr('disabled', true);
				return false;
			}
		});
	}
});