本文介绍了ColdFusion Multi Check isDefined(session)并且不为空的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我想说的是，如果这是定义的并且不是空白，请显示此内容.
I am trying to say if this isDefined and is not blank show this..
<cfif (isDefined("session.checkout.info.Certificate_2")) is not "">
我也尝试过:
<cfif (isDefined("session.checkout.info.Certificate_2")) neq "">
有人请告诉我为什么当字符串为空时它仍然显示吗?
Will someone please tell me why this still shows when the string is empty?
推荐答案
考虑使用structKeyExists(它的开销比isDefined低)，但是您可以使用:
Consider using structKeyExists (it has lower overhead than isDefined) but here you go:
<cfif
isDefined("session.checkout.info.Certificate_2")
AND session.checkout.info.Certificate_2 NEQ "">
如果存在，将检查是否为空.如果不存在，则不会检查该值.
If it exists it will then check to see if it's empty. If it doesn't exist, it won't check the value.
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