IdleDeadline: timeRemaining() method
Limited availability
This feature is not Baseline because it does not work in some of the most widely-used browsers.
The timeRemaining() method
on the IdleDeadline interface returns the estimated number of
milliseconds remaining in the current idle period. The callback can call this method at
any time to determine how much time it can continue to work before it must return. For
example, if the callback finishes a task and has another one to begin, it can call
timeRemaining() to see if there's enough time to complete the next task. If
there isn't, the callback can just return immediately, or look for other work to do with
the remaining time.
By the time timeRemaining() reaches 0, it is suggested that the callback
should return control to the user agent's event loop.
Syntax
timeRemaining()
Parameters
None.
Return value
A DOMHighResTimeStamp value (which is a floating-point number)
representing the number of milliseconds the user agent estimates are left in the current
idle period. The value is ideally accurate to within about 5 microseconds.
If the IdleDeadline object's didTimeout
property is true, this method returns zero.
Examples
See our complete example in the article Cooperative Scheduling of Background Tasks API.
Specifications
| Specification |
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| requestIdleCallback() # dom-idledeadline-timeremaining |
Browser compatibility
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Legend
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- Full support
- Full support
- No support
- No support
- See implementation notes.