Question

问题：如果我使用带有多行的java String对象，我似乎无法找到javafx webengine触发javascript函数的方法。

如果我在html中输入以下示例：“asd”在输入textArea中输入“qwe”，然后单击CLICK发送按钮。以下java代码不会运行：

webEngine.executeScript("onRecieveMsg('" + msg + "')");。

但如果我不在输入textArea中使用ENTER，它将会起作用。

请帮帮我

<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Chat</title>
</head>
<script type="text/javascript">
function onSendMsg(){
	var msg = document.getElementById("inputTextArea").value;
	document.getElementById("inputTextArea").value = "";
	java.onSendMsg(msg);
}

function onRecieveMsg(msg){
	var msg = msg;
	msg = document.getElementById("outputTextArea").value + msg;
	document.getElementById("outputTextArea").value = msg + "\n";
}

</script>

<body>
<h1>Output</h1>
<textarea id="outputTextArea" rows="10" cols="50" readonly></textarea>
<h1>Input</h1>
<textarea id="inputTextArea" rows="4" cols="50"></textarea>
<button id="sendBtn" onclick="onSendMsg()">Send</button>
</body>
</html>

import javafx.application.Application;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.concurrent.Worker.State;
import javafx.scene.Scene;
import javafx.scene.web.WebEngine;
import javafx.scene.web.WebView;
import javafx.stage.Stage;
import netscape.javascript.JSObject;


public class ViewFx extends Application {

//VARIABLES
private WebView webView;
private WebEngine webEngine; 
private WebEngineListener webEngineListener;
private JsBridge jsBridge;

//CONTRUCTOR

//METHODS
@Override
public void start(Stage stage) {
    webView = new WebView();
    webEngine = webView.getEngine();
    webEngine.load(getClass().getResource("view.html").toExternalForm());
    jsBridge = new JsBridge();
    webEngineListener = new WebEngineListener(jsBridge);
    webEngine.getLoadWorker().stateProperty().addListener(webEngineListener);

    stage.setScene(new Scene(webView));
    stage.setWidth(600);
    stage.setHeight(700);
    stage.show();
}

//INNER CLASS
private class WebEngineListener implements ChangeListener<State> {
    //VARIABLES
    private JsBridge jsBridge;
    private JSObject jsobj;

    //CONSTRUCTOR
    private WebEngineListener(JsBridge jsBridge) {
        this.jsBridge = jsBridge;
    }

    //METHODS
    @Override
    public void changed(ObservableValue<? extends State> observable, State oldState, State newState) {
        if(newState == State.SUCCEEDED) {
            jsobj = (JSObject) webEngine.executeScript("window");
            jsobj.setMember("java", jsBridge);
        }
    }
}

public class JsBridge {
    //VARIABLES

    //CONTRUCTOR

    //METHODS
    public void onSendMsg(String msg) {
        webEngine.executeScript("onRecieveMsg('" + msg + "')");
    }
}

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

}

Answer 1

多行字符串文字在JavaScript和java中都不起作用。如果收到多行消息，您只需执行无效的JavaScript代码：

收到

消息

asd
qwe

执行javascript

onRecieveMsg('asd
qwe')

您需要转义换行符，而不是将它们包含在脚本中。还有一些字符需要引用。您可以使用这样的方法来获取正确引用的字符串：

public static String toJavaScriptString(String value) {
    value = value.replace("\u0000", "\\0")
            .replace("'", "\\'")
            .replace("\\", "\\\\")
            .replace("\"", "\\\"")
            .replace("\n", "\\n")
            .replace("\r", "\\r")
            .replace("\t", "\\t");
    return "\""+ value+"\"";
}

Javafx webEngine executioncript（）无法发送多行字符串

1 个答案:

消息