Again, at the very basic level, you need the server-side check.

再次，在最基础的水平上，你需要服务器端的检查。

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You can run this check along with a check for maximum size (to avoid buffer overload attacks) on the client side, but because anyone can thwart these measures, you also check on the server side.

可以将此检查与客户端的最大大小检查(以防止缓冲区过载攻击)一起运行，但由于有人能够使这些措施失效，因此还要在服务器端进行检查。

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The goal is that the field will be validated on the server side to check that it is not empty and that the value is numeric.

目的是将字段在服务器端验证，检查其是否为空，其值是否是整数。

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