HTMLInputElement.multiple

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since ⁨2015年7月⁩.

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HTMLInputElement.multiple 属性表示一个 input 是否可以有多个值。目前只有火狐支持 <input type="file">存有多个值。

实例

// fileInput is a <input type=file multiple>
let fileInput = document.getElementById("myfileinput");

if (fileInput.multiple == true) {
  for (let i = 0; i < fileInput.files.length; i++) {
    // Loop fileInput.files
  }

  // Only one file available
} else {
  let file = fileInput.files.item(0);
}