Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
Is there a way for listening for value change of a variable in Javascript (Firefox extension)?
[update]
I am having an array I want to listen. Whenever something is pushed into that array, I want my extension to be notified. I am triggering custom event using jQuery now. I want to know whether anything better than this available within Firefox.
If you control both the code that changes the variable and the code that wants to be notified, implementing the ‘observer’ pattern is the best way to go.
With proxies (experimental), you could avoid having to fire notifications from the code that mutates the array, but I’m not sure it’s worth the hassle.
There might be standard ways to handle this in specific cases (e.g. preferences-related components already provide the observer mechanism for you).