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From "dennis hoersch (JIRA)" <>
Subject [jira] [Commented] (MYFACES-3659) Conditional include of scripts and stylesheets
Date Mon, 17 Dec 2012 19:46:46 GMT


dennis hoersch commented on MYFACES-3659:

Thanks for your reply.

> Set a "transient" just works for the server side, but on the client the resource is not
unloaded, so it does not have any effect.
Do I understand it right: To 'unload' (or 'load' new) resources in ajax requests the hint
'requestViewContext.setRenderTarget(target, true)' should be set? And then, for example if
the isRenderTarget(head) flag is set, the whole head will be encoded in the partial response?

If so, one solution might be the 'transient' thing and to check during the ajax request whether
there is any difference in the list if component resources to the one of the previous request
and set the appropriate 'isRenderTarget()' flag.

Some components add resources on 'PostAddToViewEvent' or 'PreRenderViewAddResourceEvent'.
So the checking might be directly before creating the (ajax) response. The best place I found
so far is in UIViewRoot.encodeAll():


public void encodeAll(FacesContext context) throws IOException
    checkComponentResourcesForReRendering(context, "head");
    checkComponentResourcesForReRendering(context, "body");
    checkComponentResourcesForReRendering(context, "form");


private void checkComponentResourcesForReRendering(FacesContext context, String target)
    String attributeName = "_OLD_COMPONENT_RESOURCES_" + target;
    List<UIComponent> resources = getComponentResources(context, target);
    String newResourcesMarker = resourcesToString(resources);
    if (context.getPartialViewContext().isAjaxRequest())
        String oldResourcesMarker = (String) getAttributes().get(attributeName);
        if (oldResourcesMarker != null && !newResourcesMarker.equals(oldResourcesMarker))
            if (!ExternalContextUtils.isPortlet(context.getExternalContext()) &&
                //!(component.getParent() instanceof ComponentResourceContainer)
                RequestViewContext requestViewContext = RequestViewContext.getCurrentInstance(context);
                requestViewContext.setRenderTarget(target, true);
    getAttributes().put(attributeName, newResourcesMarker);

private String resourcesToString(List<UIComponent> resources)
    StringBuilder sb = new StringBuilder();
    for (UIComponent resource : resources)
    return sb.toString();


Setting the flag in 'HtmlStylesheetRenderer' and 'HtmlScriptRenderer' could be removed than.

> Conditional include of scripts and stylesheets 
> -----------------------------------------------
>                 Key: MYFACES-3659
>                 URL:
>             Project: MyFaces Core
>          Issue Type: Bug
>    Affects Versions: 2.1.6
>         Environment: MyFaces 2.1.6, Tomahawk20 1.1.11
>            Reporter: dennis hoersch
> I am inserting a script 'X.js' dependent on a condition (c:if). The default case is to
include it. If I change the underlying value within an action so that the condition evaluates
to false, the script is still included. Also after any other following action.
> Using F5 in Firefox the page is now rendered without the script.
> The script 'X.js' was added to the view root and is never 'forgot' or removed. It is
the same if the script is included in a composite component. In that case I even observed
that the order of the scripts changes and the script 'X.js' is included before other basic
scripts like jQuery on which 'X.js' depends.
> ----
> <h:form id="form">
>   <c:set var="sessionScope" value="#{facesContext.externalContext.sessionMap}" />
>   <h:commandButton value="deactivate"
>       rendered="#{empty sessionScope.__isActive_ or sessionScope.__isActive_}">
>       <f:setPropertyActionListener target="#{sessionScope.__isActive_}" value="#{false}"
>   </h:commandButton>
>   <h:commandButton value="activate"
>       rendered="#{not empty sessionScope.__isActive_ and not sessionScope.__isActive_}">
>       <f:setPropertyActionListener target="#{sessionScope.__isActive_}" value="#{true}"
>   </h:commandButton>
>   <h:commandButton value="do nothing" />
>   <h:outputScript library="js" name="jQuery.js" target="body" />
>   <c:if test="#{empty sessionScope.__isActive_ or sessionScope.__isActive_}">
>     BLA
>     <h:outputScript library="js" name="X.js" target="body" />
>     </c:if>      
> </h:form>
> ----
> Am I doing something wrong? Is there another (or better) way to include scripts conditionally?
> (
> If I change 'HtmlOutputScriptHandler' to set the script transient, it works in the first
glance, but I don't know the impact...
> @Override
> public void onComponentPopulated(FaceletContext ctx, UIComponent c, UIComponent parent)
>     super.onComponentPopulated(ctx, c, parent);
>     c.setTransient(true);
> }
> )

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