javascript in VF page assign values from javascript to Picklist in vf page
<apex:page standardController="Account" recordSetVar="accounts">
<apex:form>
<apex:pageBlock >
<apex:pageBlockTable value="{! accounts }" var="a">
<apex:column>
<apex:inputField id="source"
value="{! a.AccountSource }"
onchange="handleChange('{! $Component.source }', '{! $Component.destination }')"/>
</apex:column>
<apex:column>
<apex:outputText id="destination" value="{! a.Name }"/>
</apex:column>
</apex:pageBlockTable>
</apex:pageBlock>
</apex:form>
<script>
function handleChange(sourceId, destinationId) {
console.log('sourceId=' + sourceId);
console.log('destinationId=' + destinationId);
var v = document.getElementById(sourceId).value;
document.getElementById(destinationId).innerHTML = v;
}
</script>
</apex:page>