[유효성]필수값 체크

function validation(formName){
    var emptyCnt = 0;
    
    var obj_name;
    var obj_data;
    var obj_essntl;
    
    formName = formName != undefined ? '#' + formName + ' ' : '';
    
    $(formName + ' input[essntl],'+ formName +' textarea[essntl],'+ formName +' select[essntl]').each(function(idx) {        
        obj_name = $(this).attr("title");
        obj_data = $.trim($(this).val());
        obj_essntl =  $(this).attr("essntl");
        obj_disabled = $(this).is(":disabled");
        
        if(obj_essntl != '' && obj_essntl != null && (obj_data == '' || obj_data == null || obj_data == '0') && !obj_disabled){
            alert(obj_name +"은(는) 필수입력 항목입니다.");
            $(this).focus();
            emptyCnt++;
            return false;
        }
    });
    
    if(emptyCnt == 0) {
        return true;
    };
}