how to validate a form without displaying any error messages - jquery-validate

Question

I do not understand how I can validate a form with jquery validate to display the Submit button or not.
My javascript is as follows:
ko.bindingHandlers.jqValidate = {
init: function (element, valueAccessor, option) {
var element = element;
var validateOptions = {
ignore: [":hidden:not(required)"],
focusCleanup: true,
onsubmit: true
};
function displaySubmitButton() { // Remove/Add class to submit button
if ($('form').valid()) $('.toSave').show();
else $('.toSave').hide();
}
$('form').bind('onchange keyup onpaste', function (event, element) {
if ($('form').valid() === true && $(element).not('.resetForm')) $('.toSave').show();
else if ($(element).not('.resetForm')) $('.toSave').hide();
});
}
};
My form :
<ol class="MutColor13 mouseOver" data-bind="jqValidate: {}">
<li class="rightCol">
<strong>
<label for="iEmailReply"><asp:Literal runat="server" ID="lEmailReply" /></label>
</strong>
<input id="iEmailReply" name="EmailReply" type="text" tabindex="2"
class="MutColor13 email"
data-bind="value: communication.Message.ReplyEmail, valueUpdate: 'afterkeydown'"
required="required" />
</li>
<li class="leftCol">
<strong>
<label for="iEmailFrom"><asp:Literal runat="server" ID="lEmailFrom" /></label>
</strong>
<input id="iEmailFrom" name="EmailFrom" type="text" tabindex="1"
class="MutColor13 email"
data-bind="value: communication.Message.SenderEmail, valueUpdate: 'afterkeydown'"
required="required" />
</li>
<!-- and more form input -->
</ol>
My submit button :
<div class="buttonBlock rightButton" data-bind="fadeVisible: validateMessage()">
<a class="MutButton3 toSave" data-bind="click: saveMessage"><span class="MutButton3">submit</span></a>
</div>
when I type "$ ('form'). valid ()" in the firebug console, all error messages appear. I do not think the submit button is the problem because I have not clicked at this point
How do I enable the display of the error message from the input short change while allowing the display of the submit button if fields (and any other form fields in the page) if all fields are valid?
I was inspired by this question: jquery validate: IF form valid then show submit button
a working demo : http://jquery.bassistance.de/validate/demo/
but the button is displayed continuously

Answer 1

ok I think this could work:
http://jsfiddle.net/Ay972/10/
what I did :
$('form').bind('change oninput', function (event, element) {
console.log('formLive :: ', $(event));
if ($('form').valid() === true && $(element).not('.resetForm')) $('.toSave').show();
else if ($(element).not('.resetForm')) $('.toSave').hide();
});
the 'change oninput' seems to work.