onsubmit+onclick в связке

<script> 
    function validate() { 
        var name = document.getElementById("name"); 
        var email = document.getElementById("email"); 
 
        event.preventDefault(); 
 
        if(!name.value) { 
            return false; 
        } 
 
        if(!email.value) { 
            return false; 
        } 
         
         
        window.open('*********/journal.pdf','_blank'); 
    } 
</script>

<form action="#" method="post" class="form-style1 form1" onsubmit="return sendForm(1);"> 
   <input type="text" id="name" name="name" placeholder="Ваше имя" onkeyup="isNotEmpty(this)" required=""> 
   <input type="text" id="email" class="email" name="email" placeholder="Ваша почта" onkeyup="isNotEmpty(this)" required=""> 
   <input type="hidden" name="form_name" value=""> 
   <input type="submit" value="Cкачать пример журнала" class="btn1" onclick="validate(); return true;">	 
</form>