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HTMLInputElement: multiple property
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The HTMLInputElement.multiple property indicates if an input can have more than one value. Firefox currently only supports multiple for <input type="file">.
html
<input id="my-file-input" type="file" multiple />
js
let fileInput = document.getElementById("my-file-input");
if (fileInput.multiple) {
// Loop fileInput.files
for (const file of fileInput.files) {
// Perform action on one file
}
// Only one file available
} else {
let [file] = fileInput.files;
}