Javascript - Mootools submit stop event

well,i have this script that i have set up that on submit requests php file that is used to validate my input values...i have set up that when it is not validated the correct way to echo it is not validated,now i want in my request when i get response and it is the error response to stop the submit..here is the script,it does send the request and returns response but it doesnt stop the submit...

window.addEvent('domready', function(){
var form=document.adminForm;
form.addEvent('submit', function(e){


var dataString="date=" + document.getElementById("date").value + "&start=" + document.getElementById("start").value + "&end=" + document.getElementById("end").value;
var requestData = new Request ({
url: '/provjera.php',
method:'POST',
async:false,
evalResponse:true,
data:dataString,
onComplete: function(responseText){
alert(responseText);
if(responseText){}
e.stop();

}
});

requestData.send();

});


});

AFAIK once the submit is started it cant be cancelled, you could however just ignore the response if the error is returned?

Alternative would be to break out what happens when the submit is issued into several parts instead of just one.

you misunderstood me,i dont wont to ignore the response...if response returns error i want to stop the submit,if it is ok to continue...

No, you misunderstand me, what i was saying was i dont think you can cancel the submit as its asynchronous, what i was saying is, if you had various steps you could use that approach.

not sure because I havent tried, but if the form had an "onsubmit='function()'" it might work,the response could be the error generated by the function, just use "return false" after the alert. but i havent tried this so not sure about this.