Web/API/PerformanceObserver/takeRecords

The takeRecords() method of the PerformanceObserver interface returns the current list of performance entries stored in the performance observer, emptying it out.

Syntax

var PerformanceEntry[] = performanceObserver.takeRecords();

Parameters

None.

Return value

A list of PerformanceEntry objects.

Example

var observer = new PerformanceObserver(function(list, obj) {
  var entries = list.getEntries();
  for (var i=0; i < entries.length; i++) {
    // Process "mark" and "frame" events
  }
});
observer.observe({entryTypes: ["mark", "frame"]});
var records = observer.takeRecords();
console.log(records[0].name);
console.log(records[0].startTime);
console.log(records[0].duration);

Specifications

Specification	Status	Comment
Performance Timeline Level 2The definition of 'takeRecords()' in that specification.	Candidate Recommendation	Initial definition of takeRecords() method.

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
takeRecords Experimental'	Chrome Full support 65	Edge Full support ≤79	Firefox Full support 60	IE No support No	Opera Full support Yes	Safari No support No	WebView Android Full support 65	Chrome Android Full support 65	Firefox Android Full support 60	Opera Android Full support Yes	Safari iOS No support No	Samsung Internet Android Full support 9.0

Legend

Full support  

Full support

No support  

No support

Experimental. Expect behavior to change in the future.'

Experimental. Expect behavior to change in the future.

PerformanceObserver.takeRecords() by Mozilla Contributors is licensed under CC-BY-SA 2.5.