Coldfusion 8:已定义('URL.variable'),但不是“”?

<cfif structKeyExists(url, 'affiliateID') and trim(url.affiliateID) neq "">...</cfif>

您可以通过使用& lt;CFPARAM.GT来简化逻辑,以确保URL变量始终存在。那么你只需要1个而不是2个条件。

<cfparam name="URL.affiliateId" type="string" default="" />

<cfif trim( URL.affiliateId ) is not "">
     do stuff here
</cfif>

忽略大部分空白

<cfif IsDefined('URL.affiliateId') and len(trim(URL.affiliateId))>
    value is defined and not empty
</cfif>

... 或交替

<cfif IsDefined('URL.affiliateId') and len(trim(URL.affiliateId)) gt 0>
    value is defined and not empty
</cfif>

<cfif IsDefined('URL.affiliateId') and URL.affiliateId neq "">
    //
</cfif>

<cfparam name="URL.affiliateId" type="string" default="" />

<cfif len(trim(URL.affiliateId))>
     ...do something with the affiliate...
</cfif>

你不需要StrutKy存在或者被定义,最好避免它们。此外,在“len()”之后不需要“大于零”部分。