Question

给出以下列表（＃oldList＃）： category1_item1, category1_item2, category2_item1, category3_item1, category3_item2"

如何创建以下列表（#newList＃）？： category1[item1&item2],category2[item1],category3[item1&item2]？

这是我到目前为止所做的：

<cfset newList = "">
<cfset category = "">

<cfloop list="#oldList#" index="listElement">
    <cfset endPos = find("_", listElement)>
    <cfset listElementCategory = left(listElement, endPos)>
    <cfset listElementItem = replace(listElement, listElementCategory, "")>

    <cfif listElementCategory is not category>
        <cfset modifiedElement = replace(listElementCategory, "_", "") & "[" & listElementItem>
    <cfelse>
        <cfset modifiedElement = "&" & listElementItem>
    </cfif>

    <cfset category = listElementCategory>

    <cfset newList = newList & modifiedElement>
</cfloop>

此代码导致： category1[item1&item2category2[item1category3[item1&item2

我无法弄清楚如何用“]，”。

关闭每个“分组”的项目

Answer 1

<cfset newList = "">
<cfset category = "">

<cfloop list="#oldList#" index="listElement">
    <cfset endPos = find("_", listElement)>
    <cfset listElementCategory = left(listElement, endPos)>
    <cfset listElementItem = replace(listElement, listElementCategory, "")>

    <cfif listElementCategory is not category>
        <cfif category is not "">
            <!--- category has changed and this isn't the first record, so close previous category --->
             <cfset newList = newList & "],">  
        </cfif>
        <cfset modifiedElement = replace(listElementCategory, "_", "") & "[" & listElementItem>
    <cfelse>
        <cfset modifiedElement = "&" & listElementItem>
    </cfif>

    <cfset category = listElementCategory>

    <cfset newList = newList & modifiedElement>
</cfloop>

注意我刚添加了这个块：

<cfif category is not "">
   <!--- category has changed and this isn't the first record, so close previous category --->
   <cfset newList = newList & "],">  
</cfif>

编辑：

几乎忘记了循环的结束！在</cfloop>关闭括号之后：

<cfif category is not "">
   <!--- close the final bracket since we have at least one record --->
   <cfset newList = newList & "]">  
</cfif>

难倒列表，字符串操作问题

1 个答案: