get selected value from selectOnemenu using javascript in primefaces and open a dialog box

Question

How can we get the selected value of PrimeFaces <p:selectOneMenu> using JavaScript/jQuery?

I am trying to get it this way, but it does not go inside if condition, which means that the ID of the element is not correct.

<h:head> 
    <script> 
        function showDialog() { 
            alert("insdie function"); 
            if($('#someSelect').val() == 'India') { 
                dlg.show(); 
                alert("after function"); 
            } 
            alert("outside function"); 
        }   
    </script> 
</h:head> 
<h:body> 
    <h:form> 
        <p:panel> 
            <h:panelGrid columns="2"> 
                <p:selectOneMenu 
                    id="someSelect" 
                    value="#{testController.countryName}" 
                    <f:selectItem itemLabel="Select One" itemValue="" /> 
                    <f:selectItems value="#{addPatientProfileBB.patStatusSelect}" 
                        itemLabel="#{testController.countryName}" 
                        itemValue="#{testController.countryNameId}" /> 
                    <p:ajax process="someSelect" update="dialog" oncomplete="showDialog()"/> 
                </p:selectOneMenu> 
            </h:panelGrid> 

            <p:dialog id="dialog" header="Login" widgetVar="dlg"> 
                <h:form> 
                    <h:panelGrid columns="2" cellpadding="5"> 
                        <h:outputLabel for="username" value="Username:" /> 
                        <p:inputText id="username" required="true" label="username" /> 
                    </h:panelGrid> 
                </h:form> 
            </p:dialog> 
        </p:panel>  
    </h:form> 
</h:body>

Answer 1

try changing

if($('#someSelect').val() == 'India') { 

into

if($("select[name$='someSelect_input'] option:selected").val() == 'India') { 

EDIT

you can improve the selector by changing

name$='someSelect_input'

into

name='yourFormName\\:someSelect_input'