在我正在开发的ColdFusion应用程序中,用户将看到两个cfselect,一个包含区域列表,另一个包含中心列表。每个地区都有自己的中心。当用户单击第一个cfselect中的某个区域时,它应该使用一个中心列表填充第二个区域。
我的计划是在列表中有一个完整的中心列表,并在它们的相应区域被选中时使它们可见。有什么简单的方法吗?我对ColdFusion非常陌生,所以我在挣扎。下面是我所拥有的两个cfselect的代码:
<td>
<cfset SelectionListWidthAndHeight = "width:375px; height:" & min(130, ((REGIONS.RecordCount-1) * 13)) & "px;">
<cfselect name = "Select_Region_ID"
query = "REGIONS"
queryposition = "below"
value = "REGION_ID"
display = "Region"
selected = "0"
size = "10"
style = #SelectionListWidthAndHeight#
required = "yes"
message = "You must specify a center."
onchange = "">
<option value="All">All regions and centers</option>
</cfselect>
</td>
<td>
<cfset SelectionListWidthAndHeight = "width:375px; height:" & min(130, ((CENTERS.RecordCount-1) * 13)) & "px;">
<cfselect name = "Select_Center_ID"
query = "CENTERS"
queryposition = "below"
value = "CENTER_ID"
display = "Center"
selected = "0"
size = "10"
style = #SelectionListWidthAndHeight#
required = "yes"
message = "You must specify a center."
>
<option value="All">All centers in region</option>
</cfselect>
</td>使用cfstoredprocs检索区域和中心列表:
<cfstoredproc procedure="spGetAllRegions" datasource="APD">
<cfprocresult name="REGIONS" resultset="1">
</cfstoredproc>
<cfstoredproc procedure="spGetAllCenters" datasource="APD">
<cfprocresult name="CENTERS" resultset="1">
</cfstoredproc>到目前为止,CFC守则:
<cfcomponent output="false">
<cfset variables.dsn = "APD">
<cffunction name="getregions" access="remote" returntype="query">
<cfset var getData = "">
<cfquery name="getData" datasource="#variables.dsn#">
SELECT DISTINCT REGION_ID FROM Regions
</cfquery>
<cfreturn getData />
</cffunction>
发布于 2018-09-21 17:00:51
(太长而不能发表评论)
实际上,它有两个部分:服务器端代码(CF)和客户端(Javascript/Ajax)。一个完整的例子对于单个S.O.线程来说有点长。如果是我,我会专注于第一次编写CF代码。让<cfcomponent>以您想要的格式返回您想要的数据。在它启动和工作之后,继续使用客户端代码。
就ColdFusion代码而言,您当前的CFC看起来不错。我要做的唯一改变就是让函数返回一个结构数组,而不是一个“查询”对象。CF在序列化查询对象时默认为摇摇欲坠的格式。更好的办法是建造自己的建筑,海事组织。
<cffunction name="getRegions" access="remote" returntype="array">
<cfquery name="local.getData" datasource="#variables.dsn#">
SELECT Region_Id, Region
FROM Regions
ORDER BY Region
</cfquery>
<!--- convert each record into structure and append to array --->
<cfset local.results = []>
<cfloop query="local.getData">
<cfset arrayAppend(local.results, {"value": region_id, "label": region})>
</cfloop>
<cfreturn local.results />
</cffunction>要查看ajax调用将接收哪些数据,请在浏览器中加载数据并测试远程函数:
http://localhost/YourComponent.cfc?method=getRegions&returnformat=json
您可以创建一个类似的函数来返回与特定区域id关联的中心。唯一的区别是它需要一个区域id作为参数:
<cffunction name="getCenters" access="remote" returntype="array">
<cfargument name="region_id" type="numeric" required="true">
<cfquery name="local.getData" datasource="#variables.dsn#">
SELECT Center_Id, Center
FROM Centers
WHERE Region_Id = <cfqueryparam value="#arguments.region_id#" cfsqltype="cf_sql_integer">
ORDER BY Center
</cfquery>
<!--- convert each record into structure and append to array --->
<cfset local.results = []>
<cfloop query="local.getData">
<cfset arrayAppend(local.results, {"value": center_id, "label": center})>
</cfloop>
<cfreturn local.results>
</cffunction> 测试是类似的,您只需要提供一个区域id作为url参数:
http://localhost/YourComponent.cfc?method=getCenters&returnformat=json®ion_id=123
https://stackoverflow.com/questions/52445695
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