alert window in my firefox addon

Question

I'm fresh to firefox addons development, so pls excuse me if it's too dumb. I just couldnt find the answer here in the Stack.

I try to launch an alert window from my addon:

alert('This is an alert');

However, it won't recognize 'alert'. What component should I include (Require)?

Thanks!

Answer 1

For a modal alert, as the question asks, better to use prompt-service, not alerts-service:

var prompts = Cc["@mozilla.org/embedcomp/prompt-service;1"].getService(Ci.nsIPromptService);
prompts.alert(null, "AlertTitle", "AlertMessage");