Add InvalidHandler after jQuery validator initialization

If you have a problem where you need to add the option 'invalidHandler' to your jqueryValidate (jQuery Validation Plugin) after it has been initialized, this is how it can be done:
$(document).ready(function(){
$("#contactForm").bind('invalid-form.validate',
function(event, validator) {
alert('validation failed!');
}
);
});

Regularly you would add this on initialization:
$(document).ready(function(){
$('#contactForm').validate({
invalidHandler:
function(event, validator) {
alert('validation failed!');
},
rules: {}
});
});

Note: invalidHandler will be called when validation of form fails on submit (e.g. values for a field is missing or such).

This might work for other options of the jqueryValidate plugin, but I'm not sure which property to use. I found the property to bind to in the jquery.validate.js file, you might want to look there.