未调用CommandButton

Question

My commandButton is not invoked when I set the value of an inputText, via ajax.

This is a portion of my code :

<h:form>
<tr>
<td><p:outputLabel>Numéro Inscription</p:outputLabel></td>  
<td><h:inputText class="span1" id="numIns" value="#{orientationMB.numins}">
    <p:ajax update="nom prenom choix1 choix2 choix3" />
</h:inputText>
</td>
<td><p:outputLabel>Nom</p:outputLabel></td>
<td><h:inputText disabled="true" id="nom" value{orientationMB.eleve.nom}"/></td>
<td><p:outputLabel>Prénom</p:outputLabel></td>
<td><h:inputText disabled="true" id="prenom"  value="#k{orientationMB.eleve.prenom}"/></td>                         
</tr>
<p:commandButton value="Créer" actionListener="#{orientationMB.ajouterOrientation}" /><br/><br/><h:form>

The backup method of the bean is comprised only of a system.out("------")