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onselect attribute is not working in apex:selectList

i write a visualforce page


<apex:page controller="sampleCon">
<apex:selectList value="{!countries}" size="1" onselect="searchFeeds();">
<apex:selectOptions value="{!items}"/>
<script type="text/javascript">
function searchFeeds(){
alert('Hello world');
<chatter:newsfeed />


and controller code is 


public class sampleCon {
String countries ;

public PageReference test() {
return null;

public List<SelectOption> getItems() {
List<SelectOption> options = new List<SelectOption>();
options.add(new SelectOption('US','US'));
options.add(new SelectOption('CANADA','Canada'));
options.add(new SelectOption('MEXICO','Mexico'));
return options;

public String getCountries() {
return countries;
public void setCountries(String countries) {
this.countries = countries;


when i select any different country from select list no alert is shown by the browser. can any one please point me why ??


try onchange, i.e.

<apex:selectList value="{!countries}" size="1" onchange="searchFeeds();">