apex:selectList

1<!-- Page: -->
2<apex:page controller="sampleCon">
3    <apex:form>
4        <apex:selectList value="{!countries}" multiselect="true">
5            <apex:selectOptions value="{!items}"/>
6        </apex:selectList><p/>
7
8        <apex:commandButton value="Test" action="{!test}" rerender="out" status="status"/>
9    </apex:form>
10
11    <apex:outputPanel id="out">
12        <apex:actionstatus id="status" startText="testing...">
13            <apex:facet name="stop">
14                <apex:outputPanel>
15                    <p>You have selected:</p>
16                    <apex:dataList value="{!countries}" var="c">{!c}</apex:dataList>
17                </apex:outputPanel>
18            </apex:facet>
19        </apex:actionstatus>
20    </apex:outputPanel>
21</apex:page>
22            
23/*** Controller: ***/
24    public class sampleCon {
25        String[] countries = new String[]{};
26        //If multiselect is false, countries must be of type String
27        //String countries;
28            
29        public PageReference test() {
30            return null;
31        }
32            
33        public List<SelectOption> getItems() {
34            List<SelectOption> options = new List<SelectOption>();
35            options.add(new SelectOption('US','US'));
36            options.add(new SelectOption('CANADA','Canada'));
37            options.add(new SelectOption('MEXICO','Mexico'));
38            return options;
39        }
40            
41        public String[] getCountries() {
42            //If multiselect is false, countries must be of type String
43            return countries;
44        }
45            
46        public void setCountries(String[] countries) {
47            //If multiselect is false, countries must be of type String
48            this.countries = countries;
49        }
50    }