I am trying to swap all the options between two Harvest Chosen select boxes. The scenario is I want to record details of a phone call. The call can either be inbound or outbound. If the call is outbound the I populate a select box (caller) with a list of possible values of those users that can make outbound calls and a second box (callee) with a list of possible values of those users they can make calls to. If the user updates the call type to be inbound then I want to swap the select boxes around so that the callee's are in the caller box and vice versa.
I very nearly have this working except each time I change the call type it keeps appending the values onto the end of the select options in each respective caller/callee select rather than completely clearing them and replacing all values.
Would appreciate some help as to why this is happening.
HTML
<label for="call_type">Call Type:</label>
<select name="call_type" id="call_type" class="chosen">
<option value="OUTGOING">Outgoing</option>
<option value="INCOMING">Incoming</option>
</select>
<label for="caller">Caller:</label>
<select name="caller" id="caller" class="caller chosen">
<option value="Caller 1">Caller 1</option>
<option value="Caller 2">Caller 2</option>
<option value="Caller 3">Caller 3</option>
<option value="OTHER">Other</option>
</select>
<label for="caller">Callee:</label>
<select name="callee" id="callee" class="callee chosen">
<option value="Callee 1">Callee 1</option>
<option value="Callee 2">Callee 2</option>
<option value="Callee 3">Callee 3</option>
<option value="OTHER">Other</option>
</select>