PerformanceResourceTiming.initiatorType
The initiatorType
read-only property is a
string
that represents the type of resource that
initiated the performance event.
The value of this string is as follows:
-
If the initiator is a
Element
, the property returns the element'slocalName
. -
If the initiator is a
CSS
resource, the property returns "css
". -
If the initiator is a
XMLHttpRequest
object, the property returns "xmlhttprequest
". -
If the initiator is a
PerformanceNavigationTiming
object, the property returns an empty string (""
).
Note: This feature is available in Web Workers
Syntax
resource.initiatorType;
Return value
A string
representing the type of resource that
initiated the performance event, as specified above.
Example
function print_PerformanceEntries() {
// Use getEntriesByType() to just get the "resource" events
var p = performance.getEntriesByType("resource");
for (var i=0; i < p.length; i++) {
print_initiatorType(p[i]);
}
}
function print_initiatorType(perfEntry) {
// Print this performance entry object's initiatorType value
var value = "initiatorType" in perfEntry;
if (value)
console.log("... initiatorType = " + perfEntry.initiatorType);
else
console.log("... initiatorType = NOT supported");
}
Specifications
Specification |
---|
Resource Timing Level 2 # dom-performanceresourcetiming-initiatortype |
Browser compatibility
BCD tables only load in the browser