Thanks guys. I am trying to avoid javascript and to do this with tapestry
components, so the ProgressiveDisplay method that François suggested seems
perfect. A bit of fiddling and it's working perfectly. For the record, and for
future searchers, here is the code that I used:
>From the tml:
<t:actionlink t:id="toggleDomains" zone="domainsZone">Domains</t:actionlink>
<t:zone t:id="domainsZone">
<t:if test="domainsVisible">
<t:progressivedisplay t:id="domainLoadingIndicator" update="show"/>
<t:block t:id="domainsBlock">
<t:grid source="domains" rowsPerPage="15"/>
</t:block>
</t:if>
</t:zone>
>From the page class:
@Persist
@Property
private boolean domainsVisible;
@SetupRender
void initialize() {
domainsVisible = false;
}
@InjectComponent
private Zone domainsZone;
@Inject
private Block domainsBlock;
Zone onActionFromToggleDomains(){
domainsVisible = domainsVisible ? false : true;
return domainsZone;
}
Block onProgressiveDisplayFromDomainLoadingIndicator(){
return domainsBlock;
}
public List<Domain> getDomains() {
if(domainsVisible){
return retrieveDomainList();
}
else {
return null;
}
}
David
On Friday, 15 April 2011 at 8:31 PM, François Facon wrote:
> Use ProgressiveDisplay component?
> http://tapestry.apache.org/tapestry5.1/tapestry-core/ref/org/apache/tapestry5/corelib/components/ProgressiveDisplay.html
>
> see example
> http://lombok.demon.co.uk/tapestry5Demo/test/core/progressivedisplaydemosource
>
> or from tapestry test case
> http://tapestry-test.appspot.com/progressivedemo
> with the related src at
> http://svn.apache.org/viewvc/tapestry/tapestry5/trunk/tapestry-core/src/test/java/org/apache/tapestry5/integration/app1/pages/ProgressiveDemo.java?view=markup
>
> François
>
>
> 2011/4/15 David Woods <dwood...@gmail.com>:
> > Hi, I'm just getting started with Tapestry5, and very impressed so far.
> >
> > I have a zone on my page containing a grid component that takes about 20
> > seconds to calculate the contents of. I don't want the loading of the page
> > to hang while this occurs, so I initially have the contents of the zone
> > hidden by an "if" component associated with a boolean property for the
> > visibility, and have the "get" method for the grid contents conditionally
> > returning null when the property is set to false. To calculate the contents
> > and display the zone I have an actionlink that changes the boolean property
> > and returns the zone body.
> >
> > The toggling works fine, but what I would like to do is display a message on
> > the page as soon as the actionlink is clicked saying that the load is in
> > progress (at the moment there is no visible change for 20s), and then this
> > message should go away when the zone appears. Is there a way to do this?
> > Also, I would appreciate any insights into whether there is a better way to
> > do this...
> >
> > From the tml:
> >
> > <t:actionlink t:id="toggleDomains"
> > zone="domainsZone">Domains</t:actionlink>
> >
> > <t:zone t:id="domainsZone">
> >
> > <t:if test="domainsVisible">
> >
> > <t:grid source="domains" rowsPerPage="15"/>
> >
> > </t:if>
> >
> > </t:zone>
> >
> >
> > From the page class:
> >
> >
> > @Persist
> >
> > @Property
> >
> > private boolean domainsVisible;
> >
> >
> >
> > @InjectComponent
> >
> > private Zone domainsZone;
> >
> >
> >
> > Zone onActionFromToggleDomains() {
> >
> > domainsVisible = domainsVisible ? false : true;
> >
> > return domainsZone;
> >
> > }
> >
> >
> >
> > public List<Domain> getDomains() {
> >
> > if(domainsVisible) {
> >
> > return retrieveDomainList();
> >
> > }
> >
> > else {
> >
> > return null;
> >
> > }
> >
> > }
> >
> >
> > Thanks for all the interesting discussion and tips.
> >
> >
> > David
>
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