Examples of org.apache.wicket.markup.head.HeaderItem

org.apache.wicket.markup.head.HeaderItem
{@code HeaderItem} represents anything that can be rendered into the header. This can, forexample, be a {@linkplain JavaScriptHeaderItem script} or a {@linkplain CssHeaderItem stylesheet}, but also {@linkplain OnEventHeaderItem event triggers} or {@linkplain StringHeaderItem freeform text}. {@code HeaderItem}s are used by {@link org.apache.wicket.markup.head.ResourceAggregator} to be able to collect allheader sections in a uniform way. All {@code HeaderItem}s are expected to have decent {@code equals}, {@code hashCode} and {@code toString} (for debugging). @author papegaaij

    }


    @Override
    public Iterable<? extends HeaderItem> getDependencies()
    {
      HeaderItem jquery = JavaScriptHeaderItem.forReference(WicketEventJQueryResourceReference.get());
      HeaderItem stylesheet = CssHeaderItem.forReference(BOOTSTRAP_CSS);
      HeaderItem responsive = CssHeaderItem.forReference(BOOTSTRAP_RESPONSIVE_CSS);
      return asList(jquery, stylesheet, responsive);
    }

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   * bundle {a, b->a}, render [a], should render [ab]
   */
  @Test
  public void testBundle()
  {
    HeaderItem bundleAB = Application.get()
      .getResourceBundles()
      .addJavaScriptBundle(Application.class, "ab.js", new ResourceReferenceA(),
        new ResourceReferenceB());
    aggregator.render(forReference(new ResourceReferenceA()));
    assertItems(bundleAB);

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   * bundle {a, b->a}, render [b], should render [ab]
   */
  @Test
  public void testBundleRenderingOther()
  {
    HeaderItem bundleAB = Application.get()
      .getResourceBundles()
      .addJavaScriptBundle(Application.class, "ab.js", new ResourceReferenceA(),
        new ResourceReferenceB());
    aggregator.render(forReference(new ResourceReferenceB()));
    assertItems(bundleAB);

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   * bundle {a, b->a}, render [a, b], should render [ab]
   */
  @Test
  public void testBundleRenderingBoth()
  {
    HeaderItem bundleAB = Application.get()
      .getResourceBundles()
      .addJavaScriptBundle(Application.class, "ab.js", new ResourceReferenceA(),
        new ResourceReferenceB());
    aggregator.render(forReference(new ResourceReferenceA()));
    aggregator.render(forReference(new ResourceReferenceB()));

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   * bundle {a, b->a}, render [d->c->a], should render [ab, c, d]
   */
  @Test
  public void testBundleRenderedAsDependency()
  {
    HeaderItem bundleAB = Application.get()
      .getResourceBundles()
      .addJavaScriptBundle(Application.class, "ab.js", new ResourceReferenceA(),
        new ResourceReferenceB());
    aggregator.render(forReference(new ResourceReferenceD()));
    assertItems(bundleAB, forReference(new ResourceReferenceC()),

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   * bundle {c->a, d->c->a}, render [d], should render [a, cd]
   */
  @Test
  public void testBundleWithDependencies()
  {
    HeaderItem bundleCD = Application.get()
      .getResourceBundles()
      .addJavaScriptBundle(Application.class, "cd.js", new ResourceReferenceC(),
        new ResourceReferenceD());
    aggregator.render(forReference(new ResourceReferenceD()));
    assertItems(forReference(new ResourceReferenceA()), bundleCD);

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   * bundle {a, b->a} and {c->a, d->c->a}, render [d], should render [ab, cd]
   */
  @Test
  public void testTwoBundlesWithDependencies()
  {
    HeaderItem bundleAB = Application.get()
      .getResourceBundles()
      .addJavaScriptBundle(Application.class, "ab.js", new ResourceReferenceA(),
        new ResourceReferenceB());
    HeaderItem bundleCD = Application.get()
      .getResourceBundles()
      .addJavaScriptBundle(Application.class, "cd.js", new ResourceReferenceC(),
        new ResourceReferenceD());
    aggregator.render(forReference(new ResourceReferenceD()));
    assertItems(bundleAB, bundleCD);

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  public List<HeaderItem> getDependencies()
  {
    List<HeaderItem> dependencies = new ArrayList<>();
    for (Iterator<? extends HeaderItem> iterator = super.getDependencies().iterator(); iterator.hasNext();)
    {
      HeaderItem headerItem = iterator.next();
      dependencies.add(headerItem);
    }
    dependencies.add(JavaScriptHeaderItem.forReference(Application.get()
      .getJavaScriptLibrarySettings()
      .getJQueryReference()));

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