为什么即使在loadContent（...）之后Document也为null？ - （WebView JavaFx） [英] Why Document is null even after loadContent(...)? - (WebView JavaFx)

问题描述

以下是MainController类初始化（...）方法的简单代码：

Here is the simple code of MainController class initialize(...) method:

WebEngine webEngine = webView.getEngine();
webEngine.loadContent("<h1>hello</h1>"); // Successfully loaded on form
Document doc = webEngine.getDocument(); // null 

为什么 doc null 以及如何修复它？

Why doc is null and how to fix it?

推荐答案

正如我评论的那样，你应该添加一个监听器，因为加载需要时间，一旦执行内容已成功加载：

As I commented, you should add a listener, as loading takes time, to execute once the content is successfully loaded:

final WebView webView = new WebView();
final WebEngine webEngine = webView.getEngine();
webEngine.getLoadWorker().stateProperty().addListener((observable, oldState, newState) -> {
    if (newState == State.SUCCEEDED) {
        Document doc = webEngine.getDocument();
    }
});
webEngine.loadContent("<h1>hello</h1>");
//webEngine.load("http://google.ch"); // This works too

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