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input file に同じファイルonchangeが発火されない

More than 1 year has passed since last update.

ファイルアップロードで型がfileのinputタグを使う時に、同じファイルを再度選択する時に、onChangeイベントが発火しないことを気づいた。
調べてみたら、同じファイルを選んだ時に、inputタグのvalueの値が変わってないから発火しない原因です。
その為、inputのonClickでvalueを初期化すれば、直れます。下記react用ソースコードをメモします。

  • 修正前
<input
  type="file"
  accept="application/pdf"
  value=""
  onChange={this.doUpload}
  />
  • 修正後
<input
  type="file"
  accept="application/pdf"
  value=""
  onChange={this.doUpload}
  onClick={(e) => {
    // valueを初期化する
    e.target.value = '';
  }}
  />

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