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

FileList: length property - Web APIs

FileList: length property

Baseline Widely available

Note: This feature is available in Web Workers.

The length read-only property of the FileList interface returns the number of files in the FileList.

Value

A number indicating the number of files in the list.

Examples Printing the number of files selected

In this example, we use length to find the number of items in the FileList.

HTML
<input type="file" multiple />
<div class="output"></div>
JavaScript
const fileInput = document.querySelector("input[type=file]");
const output = document.querySelector(".output");

fileInput.addEventListener("change", () => {
  const fileList = fileInput.files;
  output.textContent = `You've selected: ${fileList.length} file(s)`;
});
Result Specifications Browser compatibility

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