Setting a Component readonly Dynamically

[Mike Dingham]

Hi,

I am trying to traverse JSF Component tree and set all components of type UIInput as readonly.

Once I get the component, is this the right code to make it readonly?

if (component instanceof UIInput)
{
Map attrbs = component.getAttributes();
attrbs.put("readonly", "readonly");
}

It does not do any thing for me...

Thanks,
Mike

[Bauke Scholtz]

getAttributes() retrieves the key/value pairs of the nested f:attribute tags.
What you need is just the setReadonly(boolean) method of the specific UIInput components. For example:

if (component instanceof HtmlInputText) {
    ((HtmlInputText) component).setReadonly(true);
}

Also see http://java.sun.com/javaee/javaserverfaces/1.2/docs/api/javax/faces/component/UIComponentBase.html

[Mike Dingham]

Great Idea! Thanks...

I tried it in all possible places (Before/After Phase Listeners),
it is invoking setReadOnly also (As I see through debugger),
But it never renders in readOnly mode. If I check the tree before
rendering it still shows as readOnly="false" for all components..

Where do you think is the right place to implement this logic?

Thanks,
Mike

[Bauke Scholtz]

1) Put this logic in the getters of component binding.
Or, if you don't want to use component bindings,
2) Use a phaselistener which loops through the UIViewRoot and sets the UIInput componentent to readonly. Do it at the RENDER_RESPONSE phase.

[Mike Dingham]

This is the code I have which does not do anything



//Render readonly JSP
life.addPhaseListener(new PhaseListener() {

public void afterPhase(PhaseEvent event)
{
System.out.println(event.getPhaseId());

FacesContext facesContext = FacesContext.getCurrentInstance();
Boolean readOnly = (Boolean) facesContext.getApplication()
.createValueBinding(
"#{requestScope." + Constants.READ_ONLY + "}")
.getValue(facesContext);

if (readOnly != null && readOnly.equals(Boolean.TRUE))
{
UIComponentBase comp = facesContext.getViewRoot();

JSFUtils.makeReadOnly(comp);
}
}

public void beforePhase(PhaseEvent event)
{
}
public PhaseId getPhaseId()
{
return PhaseId.RENDER_RESPONSE;
}
});


///JSFUtils.java
public static void makeReadOnly(UIComponentBase component)
{
if (component == null)
{
return;
}

if (component instanceof HtmlInputText)
{
((HtmlInputText)component).setReadonly(true);
}
if (component instanceof HtmlInputTextarea)
{
((HtmlInputTextarea)component).setReadonly(true);
}

int noOfChildComps = component.getChildCount();
List childComps = component.getChildren();

for (int i=0; (i<noOfChildComps) ; i++)
{
makeReadOnly((UIComponentBase) childComps.get(i));
}

}





I tried with beforePhase also, but it does not work...

Any Ideas...

Thanks,
Mike

[Bauke Scholtz]

And after hitting F5 in the browser?

When doing a fresh start, the UIViewRoot is empty and therefore the components are created in the RENDER_RESPONSE for the first time. But I still don't understand why even the afterPhase() action doesn't work during the first call. Just after the 2nd time rendering and so on, this will work.

I have used this piece of test sample

public class MyPhaseListener implements PhaseListener {
 
    public void beforePhase(PhaseEvent event) {
        // Do nothing.
    }
 
    public void afterPhase(PhaseEvent event) {
        FacesContext context = event.getFacesContext();
        if (context != null && context.getViewRoot() != null) {
            setInputReadOnly(context.getViewRoot().getChildren());
        }
    }
 
    public PhaseId getPhaseId() {
        return PhaseId.RENDER_RESPONSE;
    }
 
    private void setInputReadOnly(List children) {
        for (Iterator child = children.iterator(); child.hasNext();) {
            UIComponent component = (UIComponent) child.next();
            if (component == null) {
                continue;
            }
            if (component instanceof HtmlInputText) {
                ((HtmlInputText) component).setReadonly(true);
            }
            if (component instanceof HtmlInputTextarea) {
                ((HtmlInputTextarea) component).setReadonly(true);
            }
            if (component.getChildCount() > 0) { // Component has more children?
                setInputReadOnly(component.getChildren()); // Loop through it's children.
            }
        }
    }
}

[Benoît de Chateauvieux]

Hi Bauke,

In the Render Response phase, the afterPhase method will be executed after the page has been displayed.
That's why your change doesn't work.

I resolved this problem implementing a custom renderkit that decorates the renderkit of my JSF implementation.

Hope it helps !

Benoît

[Daniel Almeida]

Benoît de Chateauvieux wrote:Hi Bauke,

In the Render Response phase, the afterPhase method will be executed after the page has been displayed.
That's why your change doesn't work.

I resolved this problem implementing a custom renderkit that decorates the renderkit of my JSF implementation.

Hope it helps !

Benoît

Hi, can you enter in more details about "decorating the renderkit"? I'm trying to alter components attributes before the renderization.

I have this in my faces-config.xml:

   
    <application>
        <default-render-kit-id>fguard</default-render-kit-id>
    </application>

    <render-kit>
        <render-kit-id>fguard</render-kit-id>
        <render-kit-class>tests.TestRenderKit</render-kit-class>
    </render-kit>

... And this is my custom render kit class:

public class TestRenderKit extends RenderKit{

    private RenderKit mojarraRenderKit = new RenderKitImpl();

    @Override
    public void addRenderer(String family, String rendererType, Renderer renderer) {
        mojarraRenderKit.addRenderer(family, rendererType, renderer);
    }

    @Override
    public Renderer getRenderer(String family, String rendererType) {
        return mojarraRenderKit.getRenderer(family, rendererType);
    }

    @Override
    public ResponseStateManager getResponseStateManager() {
        return mojarraRenderKit.getResponseStateManager();
    }

    @Override
    public ResponseWriter createResponseWriter(Writer writer, String contentTypeList, String characterEncoding) {
        return mojarraRenderKit.createResponseWriter(writer, contentTypeList, characterEncoding);
    }

    @Override
    public ResponseStream createResponseStream(OutputStream out) {
        return mojarraRenderKit.createResponseStream(out);
    }

}

Is everthing right? What i'm missing?

Sorry for english mistakes,

Thanks

[Daniel Almeida]

I resolve this with a custom ViewHandler:

[url=http://www.coderanch.com/t/487645/JSF/java/Authorization-over-UIComponents-with-JSF]
http://www.coderanch.com/t/487645/JSF/java/Authorization-over-UIComponents-with-JSF
[/url]

[]s

Daniel Almeida