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Editorial Team
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Asked: 2026-05-22T23:26:13+00:00

does anyone knows why doesn’t the onload event binds the this variable as expected?

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does anyone knows why doesn’t the onload event binds the this variable as expected?

Like in this test script, onkeydown gives us true (this is working fine) but onload gives us false (this now points to window.. wth?):

<!DOCTYPE html>
<html><head>
<script>
function f(t){
alert(t===document.body);
}
</script>
</head><body onkeydown="f(this);" onload="f(this);">

</body></html>
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1 Answer

  1. Editorial Team

    See the documentation:

    HTMLBodyElement.onload

    Exposes the window.onload event handler to call when the window gains focus.

    Note that this handler is triggered when the event reaches the window, not the body element. Use addEventListener() to attach an event listener to the body element.

    The important part is this handler is triggered when the event reaches the window. The handler is executed in the context of the window and not the body.

    FWIW, alert(window.onload === document.body.onload); will yield true.

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