在Coldfusion中显示结构信息

Question

我想显示结构键的值,如:

   #stReviewDetail['tags']['travelParty']['value']#

这是可能的tags,travelParty或value丢失.检查结构层次结构是否可用的最佳方法是什么？就像是:

<cfif StructKeyExists(stReviewDetail, 'tags') AND 
      StructKeyExists(stReviewDetail['tags'], 'travelParty') AND 
      StructKeyExists(stReviewDetail['tags']['travelParty'], 'value') >
    ....
</cfif>

或者有更好的方法吗？

Answer 1

多个StructKeyExists很难看,编写一个函数来简化这个很容易:

用法:

<cfif CheckNestedKeys(stReviewDetail,['tags','travelParty','value']) >
    #stReviewDetail['tags']['travelParty']['value']#
</cfif>

码:

<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>