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Show warning () after executing managed bean action method

I have a command link:

<h:commandLink value="Delete"
    onclick="return confirm('Are you sure?');" 
    action="#{bean.deleteDestination(destination, '/destination/show')}" />

It calls this managed bean action method:

public String deleteDestination(Destination selected, String action) {
    List<Flight> flights = getEjbFlightFacade().findFlightWithDestination(selected);

    if (flights.isEmpty()) {
        getEjbDestinationFacade().remove(selected);
        setDestinations(getEjbDestinationFacade().findAll());
    }
    else {
        // Here need to show an alert() that user can't remove the item.
    }

    return action;
}

As stated in the comment, I would like to show alert()

that the end user cannot delete the item. How can I achieve this?

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1 answer


Let JSF conditionally render the script you want based on the bean property.

eg.

this.undeleteable = true;

      

        
        
        
      

    
<h:outputScript rendered="#{bean.undeleteable}">
    alert("You can't delete it.");
</h:outputScript>


The canonical way, however, is to simply show the (global) entities' message.

FacesContext context = FacesContext.getCurrentInstance();
context.addMessage(null, new FacesMessage("You can't delete it."));

      

        
        
        
      

    
<h:messages globalOnly="true" />

The alerts date back to 1990.

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