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document.getElementById('order').addEventListener('submit', function(e){
document.getElementById('order').addEventListener('keyup', function(e){
var appBtns = document.getElementsByClassName('btn'), i;
for (var i = 0; i < appBtns.length; i ++)
appBtns[i].style.disabled = false;
form.submit.disabled = false;
});
var appBtns = document.getElementsByClassName('btn'), i;
for (var i = 0; i < appBtns.length; i ++)
appBtns[i].style.disabled = true;
form.submit.disabled = true;
});
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