Prof. Robert John Lancashire wrote:
Hi all,
may be this is noted somewhere but being new to the list I have not
seen the details....
I want to display 2 different applets on a page and have callbacks to
both
of them.
It is suggested that we use jmol.js to handle calls to Jmol but I
don't see
where this case is covered anywhere.
It's a closely held secret.
Should I ignore jmol.js and write my own functions or is this something
that will come out in a future release?
No, please don't ingore jmol.js. For the time being, what you need to do
is one of:
(a) modify Jmol.js to your liking, adding the callback parameters you need,
(b) copy _jmolApplet() into a new .js file, modify that, and have the
page load that .js file after Jmol.js
(c) use the jmolSetDocument(0) functionality and adjust the returned
jmolApplet
code yourself. What I do is the following, which ADDS a callback to
whatever is returned by jmolApplet()
function getapplet(name, model, codebase, height, width, script,
msgcallback,animcallback,pickcallback,loadstructcallback) {
if (!isinitialized)jmolInitialize(".")
isinitialized = 1
jmolSetDocument(0)
if (model)script = "load " + model + ";" + script
var s = jmolApplet([width,height], script)
var sext = ""
if (msgcallback) {
sext = "\n<param name='MessageCallback' value='" + msgcallback + "' />"
s = s.replace(/\<param/, sext + "\n<param")
}
if (animcallback) {
sext = "\n<param name='AnimFrameCallback' value='" + animcallback +
"' />"
s = s.replace(/\<param/, sext + "\n<param")
}
if (pickcallback) {
sext = "\n<param name='PickCallback' value='" + pickcallback + "' />"
s = s.replace(/\<param/, sext + "\n<param")
}
if (loadstructcallback) {
sext = "\n<param name='LoadStructCallback' value='" +
loadstructcallback + "' />"
s = s.replace(/\<param/, sext + "\n<param")
}
return s
}
As for using multiple applets, the messageCallbacks, for example, will
all come to one function. The first parameter returned is the applet
name, so your code can respond accordingly. Things to remember:
1) That first parameter returned to your function LOOKS like a string
but is NOT A string. It's a Java "String", not a JavaScript "string".
ALWAYS ALWAYS add "" to anything you get back from an applet IMMEDIATELY.
function myCallback(appname, message) {
appname=""+appname
message=""+message
}
For example, "appname.indexOf()" may NOT work.
2) There's a minor bug in the current Jmol.js that assigns "null" to the
applet name for IE and Opera. This must be fixed if you plan to have
callbacks arriving from two Jmol applets, otherwise you won't know which
applet sent the callback.
I'm using the (unofficial) Jmol.js version in
http://www.stolaf.edu/people/hansonr/jmol/test/json
to get around this. The only change is the addition of the line:
" <param name='name' value='jmolApplet" + nameSuffix + "' />\n" +
in the
if (useIEObject)
section. It must be that IE does not pass on the <object> name parameter
to the applet the way Firefox does. I suppose it treats that one in some
special way, like id.
3) callbacks can cause unintended browser crashes and can be
platform-dependent. Use at your own risk!
Bob
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