JavaFX TextField EventHandler

Question

目前我有一个TextField，它是我的地址栏和一个WebView，它是我的页面。当我点击时，TextField似乎没有做任何事情。它意味着运行loadPage方法并设置为页面来加载用户输入到地址栏中的任何内容。任何帮助，将不胜感激。

package javafx_webview; 

import javafx.application.Application; 
import javafx.event.ActionEvent; 
import javafx.event.EventHandler; 
import javafx.scene.Scene; 
import javafx.scene.control.TextField; 
import javafx.scene.layout.StackPane; 
import javafx.scene.web.WebEngine; 
import javafx.scene.web.WebView; 
import javafx.stage.Stage; 

public class Main extends Application { 

    WebEngine myWebEngine; 

    public static void main(String[] args) { 
     launch(args); 
    } 

    public void start(Stage primaryStage) { 
     primaryStage.setTitle("Platinum v1"); 

     TextField addressBar = new TextField(); 

     addressBar.setOnAction(new EventHandler<ActionEvent>() { 
      public void handle(ActionEvent event) { 
       loadPage(event.toString()); 
      } 
     }); 

     WebView myBrowser = new WebView(); 
     myWebEngine = myBrowser.getEngine(); 

     StackPane root = new StackPane(); 
     root.getChildren().add(myBrowser); 
     root.getChildren().add(addressBar); 
     primaryStage.setScene(new Scene(root, 640, 480)); 
     primaryStage.show(); 
    } 

    private void loadPage(String url) { 
     try { 
      myWebEngine.load(url); 
     } catch (Exception e) { 
      System.out.println("The URL you requested could not be found."); 
     } 
    } 
} 

Answer 1

获取URL，从地址栏，没有地址栏上的动作事件的toString的text加载。

final TextField addressBar = new TextField(); 
addressBar.setOnAction(new EventHandler<ActionEvent>() { 
    public void handle(ActionEvent event) { 
    myWebEngine.load(addressBar.getText()); 
    } 
}); 

此外，加载是异步的，所以你的异常处理程序将无法工作。您需要监视webengine loadworker的异常属性以从引擎中获取异常。另外请注意，未找到的网址不一定是会被报告的异常，而是一个Web服务器通常会返回一个HTTP 404错误页面。

这里是工作示例：

import javafx.application.Application; 
import javafx.beans.value.*; 
import javafx.event.*; 
import javafx.scene.Scene; 
import javafx.scene.control.TextField; 
import javafx.scene.layout.VBox; 
import javafx.scene.web.*; 
import javafx.stage.Stage; 

public class Main extends Application { 
    private WebEngine myWebEngine; 

    public void start(Stage stage) { 
    stage.setTitle("Platinum v1"); 

    final TextField addressBar = new TextField(); 

    addressBar.setOnAction(new EventHandler<ActionEvent>() { 
     public void handle(ActionEvent event) { 
     myWebEngine.load(addressBar.getText()); 
     } 
    }); 

    WebView myBrowser = new WebView(); 
    myWebEngine = myBrowser.getEngine(); 
    myWebEngine.getLoadWorker().exceptionProperty().addListener(new ChangeListener<Throwable>() { 
     @Override public void changed(ObservableValue<? extends Throwable> observableValue, Throwable oldException, Throwable exception) { 
     System.out.println("WebView encountered an exception loading a page: " + exception); 
     } 
    }); 

    VBox root = new VBox(); 
    root.getChildren().setAll(
     addressBar, 
     myBrowser 
    ); 
    stage.setScene(new Scene(root)); 
    stage.show(); 
    } 

    public static void main(String[] args) { launch(args); } 
}