Performance.getEntries()

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The getEntries() method returns a list of PerformanceEntry objects for a given filter. The list's members (entries) can be created by making performance marks or measures (for example by calling the mark() method) at explicit points in time.

This method is exposed to Window and Worker interfaces.

Syntax

General syntax:

entries = window.performance.getEntries();
entries = window.performance.getEntries(PerformanceEntryFilterOptions);

Specific usage:

entries = performance.getEntries({name: "entry_name", entryType: "mark"});

Arguments

PerformanceEntryFilterOptions Optional
PerformanceEntryFilterOptions is a dictionary with the following fields:

Return value

entries
A list of PerformanceEntry objects that meets the criteria of the filter. The items will be in chronological order based on the entries' startTime. If no objects that meet the filter are found, an empty list is returned. If no argument is given, all entries are returned.

Example

function use_PerformanceEntry_methods() {
  log("PerformanceEntry tests ...");

  if (performance.mark === undefined) {
    log("... performance.mark Not supported");
    return;
  }

  // Create some performance entries via the mark() method
  performance.mark("Begin");
  do_work(50000);
  performance.mark("End");
  performance.mark("Begin");
  do_work(100000);
  performance.mark("End");
  do_work(200000);
  performance.mark("End");

  // Use getEntries() to iterate through the each entry
  var p = performance.getEntries();
  for (var i=0; i < p.length; i++) {
    log("Entry[" + i + "]");
    check_PerformanceEntry(p[i]);
  }

  // Use getEntries(name, entryType) to get specific entries
  p = performance.getEntries({name : "Begin", entryType: "mark"});
  for (var i=0; i < p.length; i++) {
    log("Begin[" + i + "]");
    check_PerformanceEntry(p[i]);
  }

  // Use getEntriesByType() to get all "mark" entries
  p = performance.getEntriesByType("mark");
  for (var i=0; i < p.length; i++) {
    log ("Mark only entry[" + i + "]: name = " + p[i].name + 
         "; startTime = " + p[i].startTime + 
         "; duration  = " + p[i].duration);
  }

  // Use getEntriesByName() to get all "mark" entries named "Begin"
  p = performance.getEntriesByName("Begin", "mark");
  for (var i=0; i < p.length; i++) {
    log ("Mark and Begin entry[" + i + "]: name = " + p[i].name + 
         "; startTime = " + p[i].startTime + 
         "; duration  = " + p[i].duration);
  }
}

Specifications

Specification Status Comment
Performance Timeline Time Level 2
The definition of 'getEntries()' in that specification.
Editor's Draft getEntries() method has an optional argument.
Performance Timeline
The definition of 'getEntries()' in that specification.
Recommendation Initial definition.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support. (Yes) (Yes) (Yes) No support No support
getEntries() method has an optional argument. No support No support No support No support No support
Feature Android Android Webview Firefox Mobile (Gecko) Firefox OS IE Phone Opera Mobile Safari Mobile Chrome for Android
Basic support No support (Yes) 25.0 (25.0) 1.2 (25.0) 10.0 No support No support (Yes)
getEntries() method has an optional argument. No support No support No support No support No support No support No support No support

Document Tags and Contributors

 Contributors to this page: jpmedley, rolfedh, AFBarstow
 Last updated by: jpmedley,