cgi-callout in replicant

System

I have a cgi-callout in a <select> in a replicant. When the button is clicked, the onCallout event is triggered and it calls a function to populate the <select>. My issue is how do I determine which button was clicked. If I’m in the third replicant how do I know to only populate the third <select>? I am using FormAPI.

This DCT works, but since I don’t know which button was clicked I populate all the replicants. This isn’t good since I wipe out previously selected choices.

Thanks for any help.

Here’s is the portion of my DCT:

<container name="mappings">
<container combination="and" location="" max="4" min="1" name="maprep">
<label>Source and Target Mapping</label>
<item name="source" rowcontinue="t">
<label>Source Path</label>
<description>Enter a source folder</description>

<select required="t">
<cgi-callout label="Get Folders"/>
<option value="Choose a source" label="Choose a source"/>
</select>

</item>

<item name="target" rowcontinue="f">
<label>Target Path</label>
<description>Enter a target folder</description>
<select required="t">
<option value="Choose a target" label="Choose a source"/>
</select>
</item>
</container>
</container>