dart:html

readyState property

int readyState

Indicator of the current state of the request:

Value	State	Meaning
0	unsent	open() has not yet been called
1	opened	send() has not yet been called
2	headers received	sent() has been called; response headers and status are available
3	loading	responseText holds some data
4	done	request is complete

Source

@DomName('XMLHttpRequest.readyState')
@DocsEditable()
int get readyState =>
    _blink.BlinkXMLHttpRequest.instance.readyState_Getter_(this);