Contact Forms 7 with separate submit button

Hello!
I have a problem using Contact Forms 7 submitting form with an externar link who fire submit action. It works fine to usual submitting the form with data , but i want to activate validation of Contact Forms 7 when i fire this link to show validation messages and only sgmit when are all ok. I have create form with no submit button and I apply it into php code as shortcode where there are this link to submit it. I’m doing a step by step pages and its bhy i need this custom develop.

Part of code

/* Contact Forms 7 form with no submit button */
<? echo apply_shortcodes( '[contact-form-7 id="5c87d32" html_id="customizerForm" title="Form"]' ); ?>

/* Here there are some code of another content who separate form fields of submit button. For this i need a separated submit */

/* Steps buttons*/
<div class="button-layer">
	<a class="style-button" onclick="saveAndSubmit('customizerForm','saveState','1');">
		<span class="">
			<span class=""><? echo __('Back','wordpress');?>
                </span>
		        </span>
        </a>
</div>
<div class="button-layer">
	<a class="style-button" id="continue" onclick="document.getElementById('customizerForm').submit();">
		<span class="">
			<span class=""><? echo __('Continue','wordpress');?>
                        </span>
		</span>
	</a>
</div>

I apreciate some help.
Thank you.