Enable button on checkboxes

by VtoCorleone

HTML

<input id="check_1" type="checkbox" />
<input id="check_2" type="checkbox" />
<button id="submit" disabled="true">Submit</button>

JavaScript

$(function(){
    
    function areChecked(){
       var is_1_checked = $('#check_1').is(':checked');  
       var is_2_checked = $('#check_2').is(':checked');
        
       return is_1_checked == is_2_checked == true;
    }
    
    function enableButton(val){
        $('#submit').attr('disabled', false);
    }
    
    $('#check_1').on('click', function(){
        if (areChecked())
         enableButton(false);
    });
    
    $('#check_2').on('click', function(){
       if (areChecked())
         enableButton(false);
    });   
    
});