onReadyStateChange property
Stream<ProgressEvent> onReadyStateChangeEvent listeners to be notified every time the HttpRequest object's readyState
changes values.
Source
@DomName('XMLHttpRequest.onreadystatechange') @DocsEditable() Stream<ProgressEvent> get onReadyStateChange => readyStateChangeEvent.forTarget(this);
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https://api.dartlang.org/stable/1.24.3/dart-html/HttpRequest/onReadyStateChange.html