从调用applet的JavaScript方法时出错 [英] Error when calling javascript method from applet
问题描述
我想打电话给使用 netscapte.java.JSObject 从applet JavaScript方法。
I am trying to call javascript method from an Applet using netscapte.java.JSObject.
在小程序：
JSObject window = JSObject.getWindow(this.Class);
Object[] args = .... //arguments
window.call("javascriptMethodName", args);
但我得到window.call异常：
But I get the exception at window.call:
JavaScript error while calling "callFromJava"
netscape.javascript.JSException: JavaScript error while calling "callFromJava"
at sun.plugin2.main.client.MessagePassingJSObject.newJSException(Unknown Source)
at sun.plugin2.main.client.MessagePassingJSObject.waitForReply(Unknown Source)
at sun.plugin2.main.client.MessagePassingJSObject.call(Unknown Source)
at TextBoxApplet.jButton1_actionPerformed(TextBoxApplet.java:57)
at TextBoxApplet.access$000(TextBoxApplet.java:16)
at TextBoxApplet$1.actionPerformed(TextBoxApplet.java:36)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
的 JSObject 不是空。有没有人遇到这样？
非常感谢。
The JSObject is NOT null. Have anyone encountered this ?
Thanks a lot.
推荐答案
我做了一个快速测试，我的表现与 musicfreak <相关性良好/ A>的评论。
I did a quick test and my findings correlate well with musicfreak's comment.
通过以下小程序：
public class MyClass extends JApplet {
public void init() {
JSObject window = JSObject.getWindow(this);
Object[] args = new String[] { "bar" };
window.call("foo", args);
}
}
和以下标记（注意，错误的JavaScript - 有在栏的说法，我没有巴兹方法传球）：
and the following markup (notice the erroneous JavaScript - there's no baz method in the bar argument I'm passing):
<html>
<head>
<title>MyAppletTest</title>
</head>
<body>
<script type="text/javascript">
function foo(bar) { bar.baz(); }
</script>
<applet code="MyApplet.class"></applet>
</body>
</html>
我得到的错误：
netscape.javascript.JSException: JavaScript error while calling "foo"
at sun.plugin2.main.client.MessagePassingJSObject.newJSException(Unknown Source)
at sun.plugin2.main.client.MessagePassingJSObject.waitForReply(Unknown Source)
at sun.plugin2.main.client.MessagePassingJSObject.call(Unknown Source)
at MyApplet.init(MyApplet.java:13)
如果我修理更换我的JavaScript函数 bar.baz（）与警报（巴）例如，一切工作正常。
If I fix my JavaScript function by replacing bar.baz() with alert(bar) for example, everything works fine.
长话短说 - 再看看你试图调用JavaScript函数，以及参数的小程序通过与呼叫
Long story short - take another look at the JavaScript function you are trying to call, as well as the parameters your Applet passes with the call.
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