How to auto-render a GUI using Ajax

[Enrique Villamizar]

Hello to Everybody:

I have a selectOneMenu. If the user select one specific value relating to age of a person, I need to validate if this selection is valid based on code in the Backing bean. I am using Ajax and I don´t undestand why when the selection is not valid the selectOneMenu is not rendering.

The XHTML code:
<f:ajax execute="@this" render="@this" <h:selectOneMenu id="condicionEspecial" value="#{PostulacionBean.cliente.condicionesEspeciales.condicionEspecialId}" valueChangeListener="#{PostulacionBean.validarCondicion65}"> <f:selectItems value="#{InscripcionBean.listaCondicionesEspeciales}" /> </h:selectOneMenu> </f:ajax>

On the backing bean:

public void validarCondicion65(ValueChangeEvent evento) {
...

//if not a valid selection, reset it!
getCliente().getCondicionesEspeciales().setCondicionEspecialId(0);//Not rendering!
}

[Guy deLyonesse]

You should be using JSF's validation feature. You can write a custom validator that uses the selectOneMenu and whatever other values it gets compared to, and puts the result in the validation queue.

[Enrique Villamizar]

Thanks Guy deLyonesse for your help.

That's a better idea... Now I have a custom validation. Anyway I would like to use Ajax for instant validation ( I mean no waiting until the entire form will be submitted). How can I do it?