Web/API/PerformanceObserverEntryList

The PerformanceObserverEntryList interface is a list of peformance events that were explicitly observed via the observe() method.

Note: this interface is exposed to Window and Worker.

Methods

PerformanceObserverEntryList.getEntries()

Returns a list of explicitly observed PerformanceEntry objects based on the given filter.

PerformanceObserverEntryList.getEntriesByType()

Returns a list of explicitly observed PerformanceEntry objects of the given entry type.

PerformanceObserverEntryList.getEntriesByName()

Returns a list of explicitly observed PerformanceEntry objects based on the given name and entry type.

Example

// Create observer for all performance event types 
// list is of type PerformanceObserveEntryList
var observe_all = new PerformanceObserver(function(list, obs) {  
   var perfEntries = list.getEntries(); 
   for (var i = 0; i < perfEntries.length; i++) { 
      print_perf_entry(perfEntries[i]); 
      // do something with it 
   }
})

Specifications

Specification	Status	Comment
Performance Timeline Level 2The definition of 'PerformanceObserverEntryList' in that specification.	Candidate Recommendation	Initial definition.

Browser compatibility

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
PerformanceObserverEntryList	Chrome Full support 52	Edge Full support ≤79	Firefox Full support 57	IE No support No	Opera Full support 39	Safari Full support 11	WebView Android No support No	Chrome Android Full support 52	Firefox Android Full support 57	Opera Android Full support 41	Safari iOS Full support 11	Samsung Internet Android Full support 6.0
getEntries	Chrome Full support 52	Edge Full support ≤79	Firefox Full support 57	IE No support No	Opera Full support 39	Safari No support No	WebView Android No support No	Chrome Android Full support 52	Firefox Android Full support 57	Opera Android Full support 41	Safari iOS No support No	Samsung Internet Android Full support 6.0
getEntriesByName	Chrome Full support 52	Edge Full support ≤79	Firefox Full support 57	IE No support No	Opera Full support 39	Safari No support No	WebView Android No support No	Chrome Android Full support 52	Firefox Android Full support 57	Opera Android Full support 41	Safari iOS No support No	Samsung Internet Android Full support 6.0
getEntriesByType	Chrome Full support 52	Edge Full support ≤79	Firefox Full support 57	IE No support No	Opera Full support 39	Safari No support No	WebView Android No support No	Chrome Android Full support 52	Firefox Android Full support 57	Opera Android Full support 41	Safari iOS No support No	Samsung Internet Android Full support 6.0

Legend

Full support  

Full support

No support  

No support

PerformanceObserverEntryList by Mozilla Contributors is licensed under CC-BY-SA 2.5.