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Showing content from https://developer.cdn.mozilla.net/en-US/docs/Web/API/HTMLInputElement/cancel_event below:

HTMLInputElement: cancel event - Web APIs

Baseline 2023

Newly available

The cancel event fires on an <input> element when the user cancels the file picker dialog via the Esc key or the cancel button and when the user re-selects the same files that were previously selected of type="file".

This event is not cancelable but can bubble.

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

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

oncancel = (event) => { }

A generic Event.

<label for="file">Select a file. Or don't.</label>
<input type="file" id="file" name="file" />

<div id="result"></div>

div {
  margin-bottom: 10px;
}

const elem = document.getElementById("file");

const result = document.getElementById("result");

elem.addEventListener("cancel", () => {
  result.textContent = "Canceled.";
});

elem.addEventListener("change", () => {
  if (elem.files.length === 1) {
    result.textContent = "File Selected.";
  }
});

Open the file selector, then close the selection dialog with the escape key or the cancel button. Both of these will cause the cancel event to be fired. Also, try selecting a local file on your machine; then reopen the file selection window and reselect the same file. This too causes the cancel event to be fired.

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