在Coldfusion中显示结构信息 [英] Displaying Struct information in Coldfusion
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问题描述
我想显示结构键的值，如：
I want to display the value of a struct key like:
#stReviewDetail['tags']['travelParty']['value']#
c $ c>， travelParty 或值。检查结构层次结构是否可用的最佳方法是什么？例如：
It is possible that tags, travelParty or value is missing. What is the best way to check if the structure hierarchy is available? Something like:
<cfif StructKeyExists(stReviewDetail, 'tags') AND
StructKeyExists(stReviewDetail['tags'], 'travelParty') AND
StructKeyExists(stReviewDetail['tags']['travelParty'], 'value') >
....
</cfif>
还是有更好的方法吗？
推荐答案
多个StructKeyExists很丑陋，很容易写一个函数来简化这个：
Multiple StructKeyExists are ugly, and it's easy to write a function to simplify this:
<cfif CheckNestedKeys(stReviewDetail,['tags','travelParty','value']) >
#stReviewDetail['tags']['travelParty']['value']#
</cfif>
代码：
Code:
<cffunction name="CheckNestedKeys" returntype="Boolean" output=false>
<cfargument name="Struct" type="Struct" required />
<cfargument name="Keys" type="Array" required />
<cfset var CurStruct = Arguments.Struct />
<cfloop index="local.CurKey" array=#Arguments.Keys# >
<cfif StructKeyExists(CurStruct,CurKey)>
<cfset CurStruct = CurStruct[CurKey] />
<cfelse>
<cfreturn false />
</cfif>
</cfloop>
<cfreturn true />
</cffunction>
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