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):
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>
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;
}
}
// 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。