PerformanceObserverEntryList: getEntriesByName() 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 getEntriesByName() method of the PerformanceObserverEntryList interface returns a list of explicitly observed PerformanceEntry objects for a given name and entryType. The list's members are determined by the set of entry types specified in the call to the observe() method. The list is available in the observer's callback function (as the first parameter in the callback).

Syntax

js
getEntriesByName(name)
getEntriesByName(name, type)

Parameters

name

A string representing the name of the entry to retrieve.

type Optional

A string representing the type of entry to retrieve such as "mark". The valid entry types are listed in PerformanceEntry.entryType.

Return value

A list of explicitly observed performance entry objects that have the specified name and type. If the type argument is not specified, only the name will be used to determine the entries to return. The items will be in chronological order based on the entries' startTime. If no objects meet the specified criteria, an empty list is returned.

Examples

Working with getEntries, getEntriesByName and getEntriesByType

The following example shows the difference between the getEntries(), getEntriesByName(), and getEntriesByType() methods.

js
const observer = new PerformanceObserver((list, obs) => {
  // Log all entries
  let perfEntries = list.getEntries();
  perfEntries.forEach((entry) => {
    console.log(`${entry.name}'s duration: ${entry.duration}`);
  });

  // Log entries named "debugging" with type "measure"
  perfEntries = list.getEntriesByName("debugging", "measure");
  perfEntries.forEach((entry) => {
    console.log(`${entry.name}'s duration: ${entry.duration}`);
  });

  // Log entries with type "mark"
  perfEntries = list.getEntriesByType("mark");
  perfEntries.forEach((entry) => {
    console.log(`${entry.name}'s startTime: ${entry.startTime}`);
  });
});

// Subscribe to various performance event types
observer.observe({
  entryTypes: ["mark", "measure", "navigation", "resource"],
});

Specifications

Specification
Performance Timeline
# dom-performanceobserverentrylist-getentriesbyname

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobileserver
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Deno
Node.js
getEntriesByName

Legend

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Full support
Full support