Sore menjelang malam gan, ane newbie nih mau nanya tentang disable button. Ane udah stuck nih . Check script ane gan :

JS

 function check_username(){

 var email = $("#email").val();

 if(email.length > 2){

 $('#Loading').show();

 $.post("<?=base_url(); ?>ajax/cekada", {

 email: $('#email').val(),

 }, function(response){

 $('#Info').fadeOut();

 setTimeout("finishAjax('Info', '"+escape(response)+"')", 450);

 });



 return false;

 }

 }



function finishAjax(id, response){



 $('#'+id).html(unescape(response));

 $('#'+id).fadeIn(1500);

} 

[removed] 



$(function(){

 $('#email').keyup(function(){

 if ($(this).val() == '') { 

 $('.btn').prop('disabled', true);

 } else {

 $('.btn').prop('disabled', false);

 }

 });

});

[removed]

HTML ane

<input id="email" name="email">

<div id='Info'></div> 

 <button id="submit" name="submit" class="btn btn-info">Button</button>



//Footer

<scr*pt src="<?=base_url();?>assets/js/jquery.min.js">[removed]

 <scr*pt src="<?=base_url();?>assets/js/bootstrap.js">[removed]

 <scr*pt src="<?=base_url();?>assets/js/jquery-1.3.2.js">[removed]

Jadi gini loh gan, ane mau gini. Jika field email kosong trus button dibawah itu disable. Mohon bantuan yah master