如何从SelectOneMenu中的选定项更新JSF SelectManyListBox项？

Question

I have the following components:

                     <h:selectOneMenu id="company" 
                                 value="#{companyController.selected.companyId}" 
                                 onchange="?????????">

                    <f:selectItems value="#{companyController.itemsAvailableSelectOne}"/>
                </h:selectOneMenu>

                <h:outputLabel value="some value" for="locations" />

                <h:selectManyListbox id="locations" >
                    <f:selectItems value="#{companyController.selected.locationCollection}"/>
                </h:selectManyListbox>

Every time a company is selected in the SelectOneMenu i need to update the items in the SelectManyListBox.

Please Help me

Thank you very much!

Answer 1

You are going to want to use <f:ajax> . Perhaps something like this:

            <h:selectOneMenu id="company" 
                             value="#{companyController.selected.companyId}">
                <f:ajax event="valueChange" execute="@this" render="@this locations" />
                <f:selectItems value="#{companyController.itemsAvailableSelectOne}"/>
            </h:selectOneMenu>

            <h:outputLabel value="some value" for="locations" />

            <h:selectManyListbox id="locations" >
                <f:selectItems value="#{companyController.selected.locationCollection}"/>
            </h:selectManyListbox>

Then you could modify your selected objects setCompanyId method to update the locationCollection :

public void setCompanyId( long companyId ) {
    this.companyId = companyId;
    // now update your location collection
    this.locationCollection = locationCollectionMap.get( companyId );
}