Question

I have created checkboxes. When I selected multiple checkboxes then how can I get those multiple selected checkboxes value? my code is:

<h:selectManyCheckbox id="chkedition" value="#{adcreateBean.editionID}" layout="lineDirection" styleClass="nostyle">
<f:selectItems value="#{adcreateBean.editions}" var="item" itemLabel="#{item.editionName}" itemValue="#{item.editionID}"/>
</h:selectManyCheckbox>

I have taken value=”#{adcreateBean.editionID}” ,so it returns single value.

Answer 1

The value of the <h:selectManyXxx> component needs to point to an array or List of the very same type as the itemValue. Assuming that it’s Long, then it needs to be bound to a Long[] or List<Long>.

E.g.

private Long[] selectedEditionIds; // +getter +setter
private List<Edition> availableEditions; // +getter

with

<h:selectManyCheckbox value="#{bean.selectedEditionIds}">
    <f:selectItems value="#{bean.availableEditions}" var="edition" itemLabel="#{edition.name}" itemValue="#{edition.id}" />
</h:selectManyCheckbox>

If you prefer a List<Long>, then you should explicitly supply a converter for the Long type, because generic types are erased during runtime and without a converter EL would set String values in the List which would ultimately only result in ClassCaseExceptions. Thus so:

private List<Long> selectedEditionIds; // +getter +setter
private List<Edition> availableEditions; // +getter

with

<h:selectManyCheckbox value="#{bean.selectedEditionIds}" converter="javax.faces.Long">
    <f:selectItems value="#{bean.availableEditions}" var="edition" itemLabel="#{edition.name}" itemValue="#{edition.id}" />
</h:selectManyCheckbox>