????? help!在IE中用Applet如何访问所在的HTML吗?
本文导语: 用javascript可以访问html页面中的内容,比如document.body.innerHTML, 用applet可以做到这些功能吗(包括对html事件的相应,如的onclick)? 我想用applet做一个页面布局的控制器, 谁能帮我,20分全给,3x!!!!! | ...
用applet可以做到这些功能吗(包括对html事件的相应,如的onclick)?
我想用applet做一个页面布局的控制器,
谁能帮我,20分全给,3x!!!!!
|
Netscape only
A Javascript function is called from Java by using the showDocument method. A URL is needed with "javascript:" as the protocol.
[Java applet] import java.applet.*;
import java.net.*;
public class inJava extends Applet{
public void init(){
String msg = "We will jump to an HTML tag";
try {
getAppletContext().showDocument
(new URL("javascript:doAlert("" + msg +"")"));
getAppletContext().showDocument
(new URL("javascript:jumpTo("#JUMP")"));
}
catch (MalformedURLException me) { }
}
}
[Javascript and HTML]
function doAlert(s) {
alert(s);
}
function jumpTo(tag) {
self.location=tag;
}
jump here from Java via Javascript
Netscape AND Microsoft Internet Explorer v4
With IE4, Microsoft included the Netscape package netscape.javascript.* to allow a JAVA applet access to Javascript objects. To compile such Applet, you must adjust the CLASSPATH to include the Netscape java40.jar. To use the Netscape JAR, the CLASSPATH will look like this: set CLASSPATH=
.;c:windevjdk1.1.3libclasses.zip;
c:Program FilesNetscapeCommunicatorProgramJavaClassesjava40.jar;
Note that your CLASSPATH may be different depending on your JDK installation/version
To compile with IE, first locate the javapackages directory in the Windows or WinNt directory. You will find a bunch a zip files with strange names. On my installation (IE5), the file Qk1r3vrp.zip is the one containing the 2 classes you need, JSObject.class and JSException.Class. Include this zip in the classpath before compiling (or you can extract the 2 files (with directory) and create a new smaller ZIP (again with the directory) and use the new zip in the classpath). Note that if you compile with the Microsoft compiler, you don't need to do this.
NOTE: Here, you find will a a JAR containing the required objects to compile classes using the LiveConnect mechanism. This jar file can be used in the CLASSPATH to build MAYSCRIPT applets. Note that the jar is good only at compile time.
In the following example, you type in the TextField a Javascript function and press the button to execute the function. For example, try alert('Hello from JAVA'). Or you can execute function defined on the same page as the Applet. The Applet must contains the MAYSCRIPT parameter to be able to use JSObject. import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import netscape.javascript.*;
public class jsJAVA extends Applet implements
ActionListener {
Button b;
TextField t;
public void init() {
t = new TextField(20);
add(t);
b = new Button("execute Javascript");
add(b);
b.addActionListener(this);
}
public void actionPerformed(ActionEvent ae) {
if (ae.getSource() == b) {
JSObject win = (JSObject) JSObject.getWindow(this);
win.eval(t.getText());
}
}
}
Another way is to use the Reflection API. That way you don't need to modify your CLASSPATH for compilation or even import the netscape.jsobject package. // posted by C Werner on the realhowto list
import java.lang.reflect.*;
...
// Somewhere in the applet class ...
...
String jscmd = "window.close()"; /* JavaScript command */
String jsresult = null;
boolean success = false;
try {
Method getw = null, eval = null;
Object jswin = null;
Class c =
class.forName("netscape.javascript.JSObject"); /* does it in IE too */
Method ms[] = c.getMethods();
for (int i = 0; i
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