Thanks for your response!
I attempted the forcing of the ValueBinding in the setProperties() since setting value of the tag attribute was not passed on to the Component Class.
In a case like this: <my:testTag value="My message"> (or) <my:testTag> value="#{datapanel.description}">
where description is a String, the contents of the 'value' attribute in the setProperty method of the Tag class are picked up ok.
But in the case when the the Bean member is not a string (like in the dataTable case), the contents of the value attribute in setProperty() are : #{datapanel.description}. In this case, the getValue() in my Custom Component class is null and the EL does not seem to be processed.
My setProperties() method :
protected void setProperties(UIComponent component)
{
FacesContext context = FacesContext.getCurrentInstance();
super.setProperties(component);
if(value != null)
{
if (isValueReference(value))
{
ValueBinding vb = context.getApplication().createValueBinding(value);
component.setValueBinding("value", vb);
}
else
((UICustomHTMLOutput)component).setValue(value);
}
}
And my state and encode methods from the UICustomHTMLOutput:
@Override
public Object saveState(FacesContext context)
{
Object values[] = new Object[2];
values[0] = super.saveState(context);
values[1] = value;
return ((Object) (values));
}
@Override
public void restoreState(FacesContext context, Object state)
{
Object values[] = (Object[])state;
super.restoreState(context, values[0]);
value = (String)values[1];
}
// component render
public void encodeBegin(FacesContext context) throws IOException
{
ResponseWriter writer = context.getResponseWriter();
writer.startElement("p", this);
writer.write(value);
writer.endElement("p");
writer.flush();
}
Any help is greatly appreciated. Thanks!
-Rajiv
On 11/05/06, Volker Weber <[EMAIL PROTECTED]> wrote:
Hi Rajiv,
JSFSter Smith wrote:
>
> Firstly, kudos to the MyFaces team for the recent releases of myfaces
> 1.1.3 and tomahawk 1.1.2!
>
> I am just a few weeks old with JSF and am using it for a current
> project. So far its been great but I am still getting to know the
> deatils. I attempted to create a simple custom JSP tag and was able to
> get it together surprisingly quickly. But I do have a problem now. My
> tag essentially renders the string in an attribute "value". Here is a
> sample usage:
>
> <my:testTag value="My message"> (or) <my:testTag
> value="#{datapanel.description }">
>
> But the ValueBinding does not seem to work when I try to access a member
> of the DataPanel bean that is a collection or another class that has
> members. Examples of these cases are below:
>
> <t:dataTable value="#{datapanel.sentenceDisplayData}" var="each">
> <t:column>
> <my:testTag value="#{each.part0}" />
> <my:testTag value="#{ each.part1}" />
> <my:testTag value="#{each.part2}" />
> <my:testTag value="#{each.part3}" />
> </t:column>
> </t:dataTable>
>
> (OR)
> <my:testTag value="#{datapanel.summary.length">
>
> I am including my setProperties method of the TagLib class. Would be
> great if someone can point out what I am missing here.
>
> protected void setProperties(UIComponent component)
> {
> /* you have to call the super class */
>
> FacesContext context = FacesContext.getCurrentInstance();
> super.setProperties(component);
>
> if(value != null)
> {
> if (isValueReference(value))
> {
> ValueBinding vb =
> context.getApplication().createValueBinding(value);
> component.setValueBinding("value", vb);
>
----- remove following ----------
> // forcing the value from the ValueBinding to the
> component.
> if(vb != null)
> {
> if(vb.getValue(context) != null)
>
> ((UIInfactHTMLOutput)component).setValue(vb.getValue(context).toString());
> }
----- / remove following ----------
Why this? Thats the problem!
Here are the valueBinding evaluated at component creation time, but
datatable needs eavluation at rendering time!
just remove this an it should do.
> }
> else
> ((UIInfactHTMLOutput)component).setValue(value);
> }
> }
>
or better implement your set properties using UIComponentTagUtils like this:
protected void setProperties(UIComponent component)
{
super.setProperties(component);
UIComponentTagUtils.setValueProperty(getFacesContext(), component,
value);
}
Regards,
Volker
> thanks in advance!
>
> -Rajiv
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