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/*
* XOCom Javascript Source
*
* This source creates a global XO object that communicates
* with the python XPCom code running this activity.
*
* Your HTML file should register several callbacks with
* the XO object to handle requests from the activity:
*
* Example: A handler for the activity read_file and write_file
*
* <script type="text/javascript">
* XO.register('read', function(content) {
* // Your code to consume the supplied content
* })
* XO.register('write', function() {
* // Your code to return the content to save
* return 'monkey'
* })
* </script>
*
* Some commands for debugging are put in an element with the
* id 'xo-status' if it exists.
*
*
* Copiado de SocialCalc
*
*
*/
var XO = window.XO = {
callbacks: { },
set_status: function (msg) {
jQuery('#xo-status').html(msg)
},
observer: {
observe: function(req_obj,topic,command) {
now = new Date().getTime()
XO.set_status("(" + now + ") Handling " + command)
try {
// We need access to use the XPCom functions below
netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect")
// Unwrap the XPCom objects to get at the data passed to us
req_obj = req_obj.QueryInterface(Components.interfaces.nsIMutableArray)
var command_arg = undefined
if (req_obj.length) {
var iter = req_obj.enumerate()
xp_arg = iter.getNext()
xp_arg = xp_arg.QueryInterface(Components.interfaces.nsISupportsString)
command_arg = xp_arg.toString()
}
// Execute the registered callback method
return_value = XO.callbacks[command](command_arg) || ''
// Wrap the return value back into the XPCom object
var result = Components.classes["@mozilla.org/supports-string;1"].createInstance(
Components.interfaces.nsISupportsString)
result.data = return_value
req_obj.clear()
req_obj.appendElement(result, false)
XO.set_status("(" + now + ") Handled " + command + ": (" + return_value + ")")
}
catch (err) {
XO.set_status("Error handling event: " + err)
}
}
},
register: function(command, callback) {
XO.callbacks[command] = callback
}
}
/*
* This snippet registers the XO observer to receive commands
* from the python XPCom code
*/
try {
netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
var observerService = Components.classes["@mozilla.org/observer-service;1"]
.getService(Components.interfaces.nsIObserverService);
observerService.addObserver(XO.observer, 'xo-message', false);
}
catch(err) {
// Wait a bit to show this error, so the page has time to load up.
setTimeout( function() {
jQuery('#xo-status', 'JS Error: ' + err);
}, 1000)
}
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