Here is a way to render panel markup to string.
It is a bit of a tweak, I admit, but what can you do.
- Assume you have components on your page, ready to be rendered.
- In onBeforeRender, quickly switch one of your existing components to another that you want to render into a string
- Let your special component render into a string.
- Restore back to the original component that was supposed to be rendered onto the web page.
- It seems to work ok at least if your component is a panel.
Example code:
somewhere in your page hierarchy that is actually rendered
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/** * @see org.apache.wicket.Page#onBeforeRender() */ @Override protected void onBeforeRender() { System.out.println("\n-----------------------------------------\n" + MarkupUtils.renderToString(loginForm, new IntroductionPanel(loginForm.getId()))); super.onBeforeRender(); } |
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MarkupUtils.public static String renderToString(final Component parentDonorComponent, final Component component) { if (!component.getId().equals(parentDonorComponent.getId())) { throw new IllegalStateException("Component will try to substitute parentDonorComponent to render. Donor and string render Component id's must be equal."); } final Response originalResponse = RequestCycle.get().getResponse(); StringResponse stringResponse = new StringResponse(); RequestCycle.get().setResponse(stringResponse); MarkupContainer parentComponent = parentDonorComponent.getParent(); parentComponent.remove(parentDonorComponent); try { parentComponent.add(component); try { component.prepareForRender(); component.renderComponent(); } catch (RuntimeException e) { component.afterRender(); throw e; } } finally { // Restore original component parentComponent.replace(parentDonorComponent); // Restore original response RequestCycle.get().setResponse(originalResponse); } return stringResponse.toString(); } |