JavaScript和Applet通信

1、Javascript要访问的Applet的方法或属性必须都是public的 

2、在html中给applet的name属性赋值，以前是用applet标签，现在要用object，也是一样，如下（看红色name属性）： 

<OBJECT
    classid = "clsid:8AD9C840-044E-11D1-B3E9-00805F499D93"
    codebase = "http://java.sun.com/update/1.5.0/jinstall-1_5-windows-i586.cab#Version=5,0,0,7"
    WIDTH = 600 HEIGHT = 470 name="browseFileApplet">
    <PARAM NAME = CODE VALUE = "com.jointforce.applet.browsefile.BrowseFileApplet.class" >
    <PARAM NAME = ARCHIVE VALUE = "browsefileapplet.jar" >
    <PARAM NAME = "type" VALUE = "application/x-java-applet;version=1.4">
    <PARAM NAME = "scriptable" VALUE = "false">
    <PARAM NAME = username VALUE="<%=username%>">
    <PARAM NAME = socketserverip VALUE="<%=ssip%>">
    <PARAM NAME = socketserverport VALUE="<%=ssport%>">
    <PARAM NAME = sockettimeout VALUE="<%=sto%>">
    <PARAM NAME = userhomedirectory VALUE="<%=uhd%>">

    <COMMENT>
<EMBED
            type = "application/x-java-applet;version=1.4" \
            CODE = "com.jointforce.applet.browsefile.BrowseFileApplet.class" \
            ARCHIVE = "browsefileapplet.jar" \
            WIDTH = 600 \
            HEIGHT = 470 \
            name = "browseFileApplet" \
            username ="<%=username%>" \
            socketserverip ="<%=ssip%>" \
            socketserverport ="<%=ssport%>" \
            sockettimeout ="<%=sto%>" \
            userhomedirectory ="<%=uhd%>" \
     scriptable = false \
     pluginspage = "http://java.sun.com/products/plugin/index.html#download">
     <NOEMBED>
    
            </NOEMBED>
</EMBED>
    </COMMENT>
</OBJECT>

3、在javascript中直接就可以访问了，如下： 

function okbtnpressed() {
    // current selection is a directory or a file? getCurrentSel是applet的一个方法
    var currentSel = window.document.browseFileApplet.getCurrentSel();
    if (currentSel == "OK") {
        window.opener.document.SubmitTaskForm.executable.value = window.document.browseFileApplet.result;  //result是applet的一个成员变量
        window.opener = null;
        return window.close();
        return false;
    } else {
        alert("请选择一个文件！");
        return false;
    }
}

这种方法只在IE中有效，在Firefox中无效。后面将有一篇文章谈到如何在Firefox和IE中都能让JavaScript和JAVA通讯。