How to create a Link that supplies its own Markup?
- by Aranian
I'm trying to create a link that will hide or show a part of my page. The link should be reusable and display one of two images, depending on state.
Adding the two subcomponents on every page where I use the link is kind of clunky so I wanted to create a component that behaves like a link while automatically adding its content.
This is the Link component:
public class ToggleVisibilityLink extends AjaxFallbackLink<Boolean>
{
public ToggleVisibilityLink(final String id, final IModel<Boolean> model)
{
super(id, model);
setOutputMarkupId(true);
add(new Image("collapseImage")
{
@Override
public boolean isVisible()
{
return !getModelObject();
}
});
add(new Image("expandImage")
{
@Override
public boolean isVisible()
{
return getModelObject();
}
});
}
@Override
public void onClick(final AjaxRequestTarget target)
{
setModelObject(!getModelObject());
if (target != null)
{
target.add(this);
send(this.getParent(), Broadcast.EXACT, target);
}
}
}
And this is how I currently use it in HTML (this is added to the page or panel where I use the link):
<a href="#" wicket:id="collapseExpandLink" class="collapseExpandLink">
<wicket:link>
<img src="collapse.png" wicket:id="collapseImage" class="collapseExpandImage collapse">
</wicket:link>
<wicket:link>
<img src="expand.png" wicket:id="expandImage" class="collapseExpandImage expand">
</wicket:link>
</a>
And the corresponding Java call:
add(new ToggleVisibilityLink("collapseExpandLink", new PropertyModel(this, "hidden")));
But I want to be able to skip the body inside the link as one would have to know about the internals of ToggleVisibilityLink.
I experimented with IMarkupResourceStreamProvider, using Dynamic markup in Wicket as a starting point. By googling I found another example where the poster was only able to get that to work when using a Panel, and I was able to do that as well. But I'd really like to keep the link and not package it inside a Panel, as I would not be able to style the link in the markup.
I'm also open to alternatives to encapsulate the link and its body.
