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; 
   // Print all entries 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 Time Level 2 The definition of 'PerformanceObserverEntryList' in that specification.	Editor's Draft	Initial definition.

Browser compatibility

[1] Only activated in Nightly builds. Controlled by the dom.enable_performance_observer preference.