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// Kahit tanggalin mo na din yung pattern since nag JS validation na naman
<input type="text" name="contact" id="contact" maxlength=11 onchange="validateContact()">
function validateContact() {
// Palitan mo nalang yung id sa getElementById
var contactLength = document.getElementById('contact').value.length;
var submitButton = document.getElementById('theSubmit');
if(contactLength == 7 || contactLength == 11) {
submitButton.disabled = false;
} else {
alert('Invalid number length');
submitButton.disabled = true;
}
}
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