performance.getEntriesByName()

The getEntriesByName() method returns a list of PerformanceEntry objects for the given name and type. 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.

Note: This feature is available in Web Workers

Syntax

getEntriesByName(name)
getEntriesByName(name, type)

Parameters

name: The name of the entry to retrieve.
type Optional: The type of entry to retrieve such as "mark". The valid entry types are listed in PerformanceEntry.entryType.

Return value

A list of PerformanceEntry 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

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
  let p = performance.getEntries();
  for (let 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 (let 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 (let 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 (let 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
Performance Timeline # dom-performance-getentriesbyname

Browser compatibility

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