Tags: Firefox 3.x add-on sidebar.

What this post is about

I am coding a FIrefox add-on. It is fun. I am making a sidebar that you can drag and drop stuff onto. I need to know when the user has opened it or closed it (so I can persist the data) so after a lot of googling I figured it out.

The code

This is how you can watch the open and close events of a sidebar. In your sidebar javascript file put this in:

var skratch = {
    onLoad: function(e) {
        alert('load');
    },
    onUnload: function(e) {
        alert('close');
    }
}

window.addEventListener("load", function(e) { skratch.onLoad(e); }, false);
window.addEventListener("unload", function(e) { skratch.onUnload(e); }, false);

Hope that helps someone.

Use this with 'save to file' to persist data in your add-on - happy days. Happy fuckin days, man.

Here is some save to file goodness (note: the code is GPL):

http://code.flickr.com/ ... /uploadr/file.js?rev=501