检查的最佳方式，如果3文本框为空 [英] best way to check if 3 textboxes are empty

问题描述

我有3个文本框，我想检查，如果放在一起，他们全部加起来超过空白更大。
什么是实现这一目标的最佳途径？

I have 3 textboxes and I want to check if put together they all add up to greater than blank. What's the best way to accomplish that?

    <asp:TextBox ID="tbDate" runat="server"></asp:TextBox>
    <asp:TextBox ID="tbHour" runat="server"></asp:TextBox>
    <asp:TextBox ID="tbMinutes" runat="server"></asp:TextBox>

<asp:CustomValidator ID="cvDateControlValidator" runat="server" ErrorMessage="Invalid Date"
    ValidateEmptyText="True" ClientValidationFunction="validateDateOnClient" ControlToValidate="tbDate"
    Display="Dynamic"></asp:CustomValidator>

<script type="text/javascript">   
    function validateDateOnClient(sender, args) {
        if (args.Value.length > 0)
            args.IsValid = false;

        return args.IsValid;
    }

</script>

一个建议是：

if (tbDate.value != '' || tbHour.value != '' || tbMinutes.value != '')

我要确保tbDate，tbHour，tbMinutes在一起比空白更大之前，我执行客户端验证。

I want to make sure tbDate, tbHour, tbMinutes together is greater than blank before I perform the client-side validation.

推荐答案

我认为你可以这样做一个 CustomFieldValidator 。

I think you can do this with a single CustomFieldValidator.

我觉得你很接近你自己的答案。我会总和长度是这样的：

I think you are very close to the answer on your own. I would sum the lengths like this:

if (tbDate.value.length + tbHour.value.length + tbMinutes.value.length > 0)

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