根据另一个cfselect过滤cfselect中的数据

时间:2018-09-21 14:19:03

标签: javascript coldfusion

在我正在使用的ColdFusion应用程序中,用户将看到两个cfselect,一个带有区域列表,另一个带有中心列表。每个地区都有自己的中心集。当用户单击第一个cfselect中的区域时,它应在第二个cfselect中填充一个中心列表。

我的计划是在列表中包含中心的完整列表,并在选择其相应区域时使其可见。是否有捷径可寻?我是ColdFusion的新手,所以很挣扎。这是我拥有的两个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检索区域和中心的列表:

<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代码:

<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>

1 个答案:

答案 0 :(得分:3)

(评论太久了)

嗯,实际上有两部分:服务器端代码(CF)和客户端(Javascript / Ajax)。一个完整的示例对于单个S.O来说有点长。线。如果是我,我将专注于编写CF代码1st。获取<cfcomponent>以所需的格式返回所需的数据。启动并工作后,继续进行客户端代码。

就ColdFusion代码而言,您当前的CFC看起来不错。我唯一要更改的是让函数返回结构数组,而不是“查询”对象。序列化查询对象时,CF默认为闪烁格式。更好地构建自己的结构IMO。

<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调用将接收什么数据,请将其加载到浏览器中并测试远程功能:

http://localhost/YourComponent.cfc?method=getRegions&returnformat=json

您可以创建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使用区域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参数即可

http://localhost/YourComponent.cfc?method=getCenters&returnformat=json&region_id=123