Jquery操作html标签及动态添加验证的例子

var val=$('input:radio[name="invoice.hasSend"]:checked').val(); 
    if(val == '2'){ 
        var r=confirm("选择否，发票信息将清空，确定？"); 
        if (r==true) 
        { 
            $('input:radio[name="invoice.invoiceType"]').removeAttr("checked"); 
            $('textarea[name="invoice.remark"]').html(""); 
            $('input:radio[name="invoice.invoiceType"]').attr("disabled","true"); 
            $('textarea[name="invoice.remark"]').attr("disabled","true"); 
        }else{ 
            return; 
        }  
    }else{ 
        $('input:radio[name="invoice.invoiceType"]').removeAttr("disabled"); 
        $('textarea[name="invoice.remark"]').removeAttr("disabled"); 
    } 

   if(cc == 7){ 
        $("select[name^='register.shipCity']").rules("add", { required: true,maxlength:20}); 
        $("input[name^='register.shipName']").rules("add", { required: true,maxlength:20}); 
        $("textarea[name^='register.remark']").rules("add", { maxlength:200}); 
        $("#invoiceTab").show(); 
         
    }else{ 
        $("select[name^='register.shipCity']").rules("remove"); 
        $("input[name^='register.shipName']").rules("remove"); 
        $("textarea[name^='register.remark']").rules("remove"); 
        $("#invoiceTab").hide(); 
    } 

var r = $('#user400form').valid(); 
  //  alert(r); 
       if(r){ 
         $('#btnid').attr({'disabled':true}); 
         $("#user400form").submit(); 
}