primefaces selectitem onclick event [duplicate] - jsf

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commandButton/commandLink/ajax action/listener method not invoked or input value not set/updated
(12 answers)
Closed 3 years ago.
I need some help. I'm developing for jsf and primefaces web application and I'm facing a problem when I'm selecting from a drop down list to get the selected value but I'm getting an empty string in the action.
This is my xhtml code for selectOneMenu tag
<p:selectOneMenu value="#{tanAllot.batchName}" id="batchName">
<f:selectItem itemLabel="Select Batch" itemValue="" />
<f:selectItems value="#{tanAllot.batchList}" />
<p:ajax event="change" listener="#{tanAllot.test}" />
</p:selectOneMenu>
this is the method I'm using in the action class
private String batchName;
public String getBatchName() {
return batchName;
}
public void setBatchName(String batchName) {
this.batchName = batchName;
}
public void test() {
System.out.println(batchName);
}
My problem is when I select a value from p:selectOneMenu tag the default method should invoke in the action and retrieve the value but I'm getting an empty string.
Can anyone help me to solve this problem?

Answer 1

Consider the nature of batchList. batchList must be List of Strings. Using itemValue attribute (in f:selectItem) can be helpful.
Check my example. It uses a list of provinces (instances of "Province" class). However I only need the "id" value which is a "Long"; if I wanted the whole picked province as a "Province object" I would need a "Converter". (Example works perfectly):
<p:selectOneMenu id="provinceField"
value="#{addAddressesMB.formAddress.provinceId}">
<f:selectItem itemLabel="Select One" itemValue="" />
<f:selectItems value="#{addAddressesMB.provinceList}" var="i"
itemLabel="#{i.description}" itemValue="#{i.id}" />
<p:ajax update=":formId:cityField"
listener="#{addAddressesMB.provinceChangeHandler}" />
</p:selectOneMenu>
And here comes the listener method:
public void provinceChangeHandler() {
//do whatever you want with formAddress.provinceId
System.out.println(this.formAddress.provinceId);
//In my case I filter the cities according to the selected provinceId
// After that I update the cities dropdown(cityField) in the view.
}
Check your code and feel free to ask. Good luck.