jQuery Pelo menos uma checkbox selecionada

by Salustiano Silva

HTML

<form>
    <label>
        <input type="checkbox" name="checkCountry[]" value="pt" class="check-group"> PT
    </label>
    <label>
        <input type="checkbox" name="checkCountry[]" value="en" class="check-group"> EN
    </label>
    <label>
        <input type="checkbox" name="checkCountry[]" value="de" class="check-group"> DE
    </label>
    <label>
        <input type="checkbox" name="checkCountry[]" value="es" class="check-group"> ES
    </label>
    <label>
        <input type="checkbox" name="checkCountry[]" value="fr" class="check-group"> FR
    </label>
</form>

JavaScript

$(function () {
    $('form').on("click", '.check-group', function (e) {
        return ($("form input:checkbox:checked").length >= 1);
    });
})