#ask-questions
Title
# ask-questions
c
colossal-beard-78764
10/30/2023, 2:49 AMHello，trackingCallback only fires when i call isOn or getFeatureValue, Is this a normal situation？
✅ 1
r
rhythmic-agent-34208
10/30/2023, 2:49 AM@blue-sundown-32899 has marked the issue as closed. Reopen Issue button
f
fresh-football-47124
10/30/2023, 9:09 AM
It will fire for both of those if the feature includes an experiment
but yes, it should only fire when a feature is evaluated
c
colossal-beard-78764
10/30/2023, 10:22 AMi call isOn the first time trackingCallback fire, the second time i call isOn ,it dose not fire?
image.png
f
fresh-football-47124
10/30/2023, 10:29 AM
I’m not sure about calling it twice for the same feature, I’d have to check the code to see if it checks for that
I imagine it may just fire it twice - what does it do if you run that?
c
colossal-beard-78764
10/30/2023, 10:44 AMonly fire once
growthbook.isOn('test-bool-feature-1025')
growthbook.getFeatureValue("test-json-feature-1025", "{}")
two features like above , also fired once
b
brief-honey-45610
10/31/2023, 5:53 PMHello, I wanted to check in on this question you asked. Were you able to resolve it?
r
rhythmic-agent-34208
11/02/2023, 3:08 PMHello, I'll close this ticket now, but if you need to re-open it for this same issue simply reply in the thread. Thanks!
c
colossal-beard-78764
12/01/2023, 12:28 AMhas not been resolved
f
fresh-football-47124
12/01/2023, 12:28 AM
same issue?
we do some caching, so firing once is fine
c
colossal-beard-78764
12/01/2023, 12:31 AMmy website is spa framework，spa maybe is the root cause
f
fresh-football-47124
12/01/2023, 12:32 AM
we work fine with single page apps - is the feature not updating correctly or are you concerned about the tracking callback event?
c
colossal-beard-78764
12/01/2023, 12:34 AMI have double checked.firing when open website the first time or reload website
f
fresh-football-47124
12/01/2023, 9:10 PM
are you targeting features that are page dependent? if so you may need to add a useEffect hook
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