holfza

<?php if(isset($row)) :  ?>
                    <div class="uk-button-group">
                            <a class="uk-button uk-button-link uk-button-large" href="../auth/signup.php">Регистрация</a>
                            <a class="uk-button uk-button-success uk-button-large uk-margin-left" href="../auth/login.php" style="background-color: #ffb433;"onmouseover="this.style.backgroundColor='#eb8d00';" onmouseout="this.style.backgroundColor='#ffb433';"><i class="uk-icon-lock uk-margin-small-right"></i> Войти</a>'
                    </div>
<?php  endif;  ?>

Попробуйте так:
$(function(){
    var hiddenId;
    $("input.typeahead").click(function(){
        var idInputField = $(this).attr("id");//***_complete
        hiddenId = idInputField.split("_").slice(0,1);//****
		
		console.log(hiddenId);
    });
    
});