Submit form only if at least one checkbox is checked

Question

i\'m triyng to validate a form. In this form you\'ve to choose at least one element by checkboxes, and I can\'t be sure about their quantity (it depends by elements number).

Answer 1

try this

var checked = false;
$(function(){
    $('#subm').click(function(e){
        checkall();
        if(!checked){
            e.preventDefault();
        }
    });
    $('.roomselect').change(function(e){
        checkall();
    });
    checkall();
});
function checkall()
{
    checked = $('.roomselect:checked').length > 0;
    $('#subm').prop('disabled',!checked);
}