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Answer 1

A:

You need to create a prefs.js file with the default values you want.

Then, you can reference the preference using nsiPrefService, like this, if it is a boolean stored as mybranch.mybooleanpreference:

var prefs = Components.classes["@mozilla.org/preferences-service;1"]
                    .getService(Components.interfaces.nsIPrefService).getBranch("mybranch.");

var value = prefs.getBoolPref("mybooleanpreference");

See Preference code snippet here, or

pc1oad1etter 2010-08-21 02:32:08

Thanks! This is helpful for setting the default preference but how do I use the value in the XUL? The effect would allow me to do something like: <?xml version="1.0" encoding="UTF-8"?> <overlay id="my-overlay" xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"> <script src="http://[[value-from-preference]]/some/script.js"/> </overlay>Thanks again!

luisgo 2010-08-22 07:00:42

That is... where [[value-from-preference]] is the value set in the preference.

luisgo 2010-08-22 07:01:29

I"ve added more documentation and an example of getting a preference value in Javascript.

pc1oad1etter 2010-08-23 03:24:45

That works great. I am able to read the preference set by default. But any idea how to use that preference in the XUL itself? I want developers to be able to change the preference so example.com above can be changed through it. Thanks.

luisgo 2010-08-26 01:22:59

You need to refer to it in JavaScript. I don't think that you could access that directly from XUL, without Javascript. I guess you could set the src of that element in the onload event, which may accomplish what you want.

pc1oad1etter 2010-08-26 14:42:49

Answer 2

A:

It sounds like you want to do something like this:

In your XUL file add:

<body onload="return myFunc();">

In your javascript add a function:

function myFunc() {
var prefs = Components.classes["@mozilla.org/preferences-service;1"]
                    .getService(Components.interfaces.nsIPrefService).getBranch("mybranch.");
   var src = "http://"+prefs.getStringPref("mystringpreference")+"/some/script.js";
   var script = document.getElementsByTagName("script")[0];

   script.setAttribute("src", src);
}

Making sure you add the script include for the javascript file as well, something like:

<script src="chrome://myextension/content/myjavascript.js

Hope this helps!

Alex 2010-09-15 02:04:26

was this of any help?

Alex 2010-09-17 17:50:44

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Using preferences in XUL

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