javascript 如何从java代码调用javascript函数
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How to call javascript function from java code
提问by luperxe
I'm trying to call a javascript function from a java class, but I get these errors:
我正在尝试从 java 类调用 javascript 函数，但出现以下错误：
-Could not find method sun.misc.Service.installedProviders, referenced from method javax.script.ScriptEngineManager.initEngines
-Could not find method sun.misc.Service.providers, referenced from method javax.script.ScriptEngineManager.initEngines
-Could not find method sun.misc.Service.installedProviders, referenced from method javax.script.ScriptEngineManager.initEngines
-java.lang.VerifyError: javax.script.ScriptEngineManager
Here the code:
这里的代码：
public void sendResult(){
ScriptEngineManager manager = new ScriptEngineManager();
ScriptEngine engine = manager.getEngineByName("js");
String script = "function send() {"+"var id_result = window.MyPGP.getResult();"+
"document.getElementById('id_result').value = id_result;"+"console.log(\"change the box value\");";
try {
engine.eval(script);
Invocable invocableEngine = (Invocable) engine;
invocableEngine.invokeFunction("send");
} catch (ScriptException e) {
e.printStackTrace();
} catch (NoSuchMethodException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
What I'm trying exactly to do is that when the payment is finished, this function is called in other methods in this class to get the result of the payment and it is printed in a box in the main html.
我真正想要做的是，当支付完成时，这个函数在这个类的其他方法中被调用以获取支付的结果，并将它打印在主 html 的一个框中。
回答by Himanshu
ScriptEngine engine = manager.getEngineByName("JavaScript");
Does this work?
这行得通吗？
回答by Coder_sLaY
You can do something like this
你可以做这样的事情
super.loadUrl("file:///android_asset/www/index.html", 20000);
super.loadUrl("javascript: { var pageFlag = '" + flag + "';}"); // Your Javascript function here
回答by diegol
use this code
使用此代码
import javax.script.*;
public class InvokeScriptFunction {
public static void main(String[] args) throws Exception {
ScriptEngineManager manager = new ScriptEngineManager();
ScriptEngine engine = manager.getEngineByName("JavaScript");
// JavaScript code in a String
String script = "function hello(name) { print('Hello, ' + name); }";
// evaluate script
engine.eval(script);
// javax.script.Invocable is an optional interface.
// Check whether your script engine implements or not!
// Note that the JavaScript engine implements Invocable interface.
Invocable inv = (Invocable) engine;
// invoke the global function named "hello"
inv.invokeFunction("hello", "Scripting!!" );
}
}
good luck
祝你好运
