SelectOneMenu: How can I fire a backing bean method just when click

I want that when just I click one option of Dropdown list it fires a backing bean method.
The method must take the new value of dropdown, to execute a SQL to populate a new (another one) dropdown list and refresh the page.
My code
                        <h:commandButton id="button1" style="left: 216px; top: 216px; position: absolute" value="Cancelar"/>
                        <h:commandButton id="button2" style="left: 312px; top: 216px; position: absolute" value="Generar"/>
                        <h:outputLabel for="componentLabel5" id="componentLabel5" style="left: 120px; top: 0px; position: absolute">
                            <h:outputText id="componentLabel5Text" value="Título de la Página"/>
                        </h:outputLabel>
                        <h:selectOneMenu immediate="true" value="#{fgstb.ctoId}" valueChangeListener="#{fgstb.cambiaValorCtos}" id="dropdown1" style="left: 264px; top: 72px; position: absolute; width: 120px">
                            <f:selectItems id="dropdown1SelectItems" value="#{fgstb.ctos}"/>
                        </h:selectOneMenu>
                        <h:selectOneRadio id="radioButtonList1" layout="pageDirection" style="left: 48px; top: 48px; position: absolute" value="#{fgstb.modo}">
                            <f:selectItem id="radioButton1" itemLabel="Generar Campeonato" itemValue="1"/>
                            <f:selectItem id="radioButton2" itemLabel="Generar desde Campeonato" itemValue="2"/>
                            <f:selectItem id="radioButton3" itemLabel="Generar Todos Campeonatos" itemValue="3"/>
                        </h:selectOneRadio>It works fine but when I push a button and I would like it works when I click over dropdown list.
Thank you

Hi,
You can simply add onchange="submit()" attribute to your component to allow form to be submited when the coomponent value is changed, and add also a value change listener to allow JSF to be notiifed for component value change event :
<h:selectOneMenu onchange="submit()" valueChangeListener="#{fgstb.cambiaValorCtos}"
immediate="true" value="#{fgstb.ctoId}" id="dropdown1" style="left: 264px; top: 72px; position: absolute; width: 120px">
<f:selectItems id="dropdown1SelectItems" value="#{fgstb.ctos}"/>
</h:selectOneMenu>

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SelectOneMenu: How can I fire a backing bean method just when click

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