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---
title: XMLHttpRequestEventTarget.onload
slug: Web/API/XMLHttpRequest/load_event
translation_of: Web/API/XMLHttpRequestEventTarget/onload
original_slug: Web/API/XMLHttpRequestEventTarget/onload
---
{{APIRef("XMLHttpRequest")}}
The **`XMLHttpRequestEventTarget.onload`** is the function called when an {{domxref("XMLHttpRequest")}} transaction completes successfully.
## Syntax
XMLHttpRequest.onload = callback;
### Values
- `callback` is the function to be executed when the request completes successfully. It receives a {{domxref("ProgressEvent")}} object as its first argument. The value of *this* (i.e. the context) is the same {{domxref("XMLHttpRequest")}} this callback is related to.
## Example
```js
var xmlhttp = new XMLHttpRequest(),
method = 'GET',
url = 'https://developer.mozilla.org/';
xmlhttp.open(method, url, true);
xmlhttp.onload = function () {
// Do something with the retrieved data ( found in xmlhttp.response )
};
xmlhttp.send();
```
## Specifications
| Specification | Status | Comment |
| ------------------------------------------------------------------------ | ------------------------------------ | ---------------------- |
| {{SpecName('XMLHttpRequest', '#handler-xhr-onload')}} | {{Spec2('XMLHttpRequest')}} | WHATWG living standard |
## Browser compatibility
{{Compat("api.XMLHttpRequestEventTarget.onload")}}
|
