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oracleoracle 

select multiple="multiple" accept data question?

   <apex:form id="theForm" forceSSL="true">
                <select multiple="multiple" size="3"  name="laogao" tabindex="12"  style="width: 235px; ">
                                                                                                            <optgroup style="font-size:9px;text-decoration:none;"label="Chosen">
                                                                                                                <p>
                                                                                                                </p>
                                                                                                               
                                                                                                                <option value="sdf">sdf</option>
                                                                                                                 <option value="sdf">sdf</option>
                                                                                                            </optgroup>
                </select>

</apex:form>

 

    String s = Apexpages.currentPage().getParameters().get('laogao');
system.debug('00NR0000000cxZ1_selected:::::::::' + s);

 

print s=null;

 

how solve this question?