PerformanceObserver: takeRecords() method
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2015.
Note: This feature is available in Web Workers.
The takeRecords() method of the PerformanceObserver interface returns the current list of PerformanceEntry objects stored in the performance observer, emptying it out.
Syntax
js
takeRecords()
Parameters
None.
Return value
A list of PerformanceEntry objects.
Examples
Taking records
The following example stores the current list of performance entries into records and empties the performance observer.
js
const observer = new PerformanceObserver((list, obj) => {
list.getEntries().forEach((entry) => {
// Process "mark" and "measure" events
});
});
observer.observe({ entryTypes: ["mark", "measure"] });
const records = observer.takeRecords();
console.log(records[0].name);
console.log(records[0].startTime);
console.log(records[0].duration);
Specifications
| Specification |
|---|
| Performance Timeline # dom-performanceobserver-takerecords |
Browser compatibility
BCD tables only load in the browser