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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/readystatechange_event below:

XMLHttpRequest: readystatechange event - Web APIs

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Note: This feature is available in Web Workers, except for Service Workers.

The readystatechange event is fired whenever the readyState property of the XMLHttpRequest changes.

Warning: This should not be used with synchronous requests and must not be used from native code.

Use the event name in methods like addEventListener(), or set an event handler property.

addEventListener("readystatechange", (event) => { })

onreadystatechange = (event) => { }

A generic Event with no added properties.

const xhr = new XMLHttpRequest();
const method = "GET";
const url = "https://developer.mozilla.org/";

xhr.open(method, url, true);
xhr.onreadystatechange = () => {
  // In local files, status is 0 upon success in Mozilla Firefox
  if (xhr.readyState === XMLHttpRequest.DONE) {
    const status = xhr.status;
    if (status === 0 || (status >= 200 && status < 400)) {
      // The request has been completed successfully
      console.log(xhr.responseText);
    } else {
      // Oh no! There has been an error with the request!
    }
  }
};
xhr.send();

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