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

Vanilla JavaScript equivalent of the jQuery way, using document.querySelector

if (document.querySelector('.roomselect:checked')) {
    // somethings checked
}

Demo

Answer 2

$("#form_id").submit(function(e) {        
    var totalChecked = $('#div_id:input[type="checkbox"]:checked').length;        
    if(totalChecked < 1)
    {            
        alert('Please select at least one checkbox before submit');
        return false;
    }  

});