Question

I want to check for duplicate emails in the list, so I get a list of emails and then not sure how to loop it in order to compare each email in the list..

var emails = $('td.emails input');
emails.each(function(){

how to compare emails here

});

Answer 1

You can use a hash to track uniqueness. In Javascript, this means an object; try this:

var emails = $('td.emails input');
var found = {};

emails.each(function() {
    var email = $(this).val();

    if (email in found) {
        // duplicate!
    } else {
        found[email] = true;
    }
});