JavaFX-HtmleElements在更改页面时为空

当用户单击链接时，我想更改页面，然后加载相关信息

但是，

HTMLElement

始终为

null

代码如下：

WebViewPanel.java

//to be used in JFX Thread
public void loadURLFX(final String url) {
    if (Misc.stringHasContent(url)) {

        String tmp = toURL(url);

        if (tmp == null) {
            tmp = toURL("http://" + url);
        }

        boolean invalidURL = false;
        InputStream stream = null;
        try {
            URL urlObj = new URL(tmp);
            stream = urlObj.openStream();
        } catch (Exception e) {
            invalidURL = true;
        } finally {
            try {
                stream.close();
            } catch (Exception ex) {
            }
            stream = null;
        }

        if (!invalidURL) {
            engine.load(tmp);
        } else {
            //https://www.google.com.sg/search?q=searchTerm
            engine.load("https://www.google.com.sg/search?q=" + url);
        }
    }
}

public void load(){
    if(Platform.isFxApplicationThread()){
        webViewPanel.loadURLFX(App.class.getResource("/hello.html").toExternalForm());
        HTMLElement element = (HTMLElement) WebMisc.getHTMLElement(webViewPanel.getWebEngine(), "menu");
    }
}

App.java

//to be used in JFX Thread
public void loadURLFX(final String url) {
    if (Misc.stringHasContent(url)) {

        String tmp = toURL(url);

        if (tmp == null) {
            tmp = toURL("http://" + url);
        }

        boolean invalidURL = false;
        InputStream stream = null;
        try {
            URL urlObj = new URL(tmp);
            stream = urlObj.openStream();
        } catch (Exception e) {
            invalidURL = true;
        } finally {
            try {
                stream.close();
            } catch (Exception ex) {
            }
            stream = null;
        }

        if (!invalidURL) {
            engine.load(tmp);
        } else {
            //https://www.google.com.sg/search?q=searchTerm
            engine.load("https://www.google.com.sg/search?q=" + url);
        }
    }
}

public void load(){
    if(Platform.isFxApplicationThread()){
        webViewPanel.loadURLFX(App.class.getResource("/hello.html").toExternalForm());
        HTMLElement element = (HTMLElement) WebMisc.getHTMLElement(webViewPanel.getWebEngine(), "menu");
    }
}

---

元素

始终为空。我应该做些什么来修复它？

您的

hello.html

中的

菜单是什么？您正在使用getElementById（）？等待页面完全加载。请参阅WebEngine的javadoc。