我在Wicket中有两个面板。

ParentPanel
ChildPanel

情境

ChildPanelParentPanel的组件。
每次在“父面板”中触发某个事件时,我都想在ChildPanel中添加某个javascript。

工作方案

ParentPanel.java

public class ParentPanel extends Panel
{
    private static final long serialVersionUID = 4306746527837380863L;
    private final ChildPanel childPanel;

    public ParentPanel(String aId, IModel<AnnotatorState> aModel)
    {
        super(aId);
        model = aModel;

        // initially the Child panel is empty. passing empty model
        childPanel = new ChildPanel("child-container", Model.of());
        childPanel.setOutputMarkupId(true);
        add(childPanel);
    }

    @OnEvent
    public void onClickText(RenderEvent aEvent)
    {
        LOG.trace("Event Fired");
        IPartialPageRequestHandler iPartialPageRequestHandler = aEvent.getRequestHandler();

        Integer someData = getSomeData();
        childPanel.setDefaultModel(Model.of(someData));

        //I am trying to add the child panel to the ajax target to ensure rerendering of child panel.
        iPartialPageRequestHandler.add(childPanel);
    }
}


ChildPanel.java

public class ChildPanel extends Panel
{
    private static final long serialVersionUID = -3849226240909011148L;
    private static final Logger LOG = LoggerFactory.getLogger(ChildPanel.class);
    private IModel<Integer> model;

    public ChildPanel(String aId, IModel<Integer> aModel)
    {
        super(aId);
        model = (aModel);
    }

    @Override
    public void renderHead(IHeaderResponse aResponse)
    {
        super.renderHead(aResponse);
        model = (IModel<Integer>) getDefaultModel();

        if (model == null)
            return;
        Integer someData = model.getObject();
        String someJavascript = createSomeJavascript(someData);

        log.debug("Rendering Updated UI with the JS: ", javascript);
        aResponse.render(OnDomReadyHeaderItem.forScript(javascript));
    }
}


显然,每次将childPanel添加到iPartialPageRequestHandler时,都会调用renderHead(),它的工作是在ParentPanel中触发的每个事件上更新UI。

问题

但是,有人告诉我这不是一个好习惯。由于在这种情况下,JS被添加到renderHead()中,因此它最终出现在页面源代码中-当发送(大)JSON数据时,它变得很麻烦。仅在Wicket可能/可行的情况下,才需要找到一个将JS附加到AJAX目标的好地方(也许render()或onRender()或onAfterRender()可能更好)。由于我的知识有限,我无法猜测我还能如何实现该方案。任何其他(更好或更可行的)解决方案都值得欢迎和赞赏。

谢谢。

最佳答案

我认为问题是createSomeJavascript创建了很多代码?

然后,我将对其进行重构,以使createSomeJavascript仅调用使用JavaScriptResourceReference添加到组件的函数。这样,只有一小部分Javascript最终出现在源代码中。

例如,将您的javascript放在这样的外部文件中:

private static final ResourceReference  JS_QM   = new JavaScriptResourceReference( ClientPanel.class, "question.mark.js" );


@Override
public void renderHead( Component component, IHeaderResponse response )
{
    super.renderHead( component, response );
    response.render( JavaScriptReferenceHeaderItem.forReference( JS_QM, "question-mark" ) );
    ...
}

07-24 17:29