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form.ajaxSubmit() でアップロード

Last updated at Posted at 2015-06-25

概要

  • form.ajaxSubmit() で画面遷移なしにアップロード
  • ファイル選択をすると即アップロード
  • アップロード受付側はなんでもいい

コード

HTML

index.html
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title></title>
  <script src="//code.jquery.com/jquery-2.1.4.min.js"></script>
  <script src="//malsup.github.com/jquery.form.js"></script>
  <script src="script.js"></script>
</head>
<body>
  <form action="upload.php" method="POST" id="form" enctype="multipart/form-data">
    <input id="file" type="file" name="myfile" accept="image/png">
  </form>
</body>
</html>

PHP (アップロード待ち受け)

PHP マニュアルページからコピペ。必要最小限のアップロード待ち受け処理

upload.php
<?php
// In PHP versions earlier than 4.1.0, $HTTP_POST_FILES should be used instead
// of $_FILES.

$uploaddir = 'uploads/';
$uploadfile = $uploaddir . basename($_FILES['myfile']['name']);

if (move_uploaded_file($_FILES['myfile']['tmp_name'], $uploadfile)) {
    echo "File is valid, and was successfully uploaded.\n";
} else {
    echo "Possible file upload attack!\n";
}

// echo 'Here is some more debugging info:';
// print_r($_FILES);

jQuery

script.js
$(document).ready(function () {
  $('#file').on('change', function () {
    $('#form').submit();
  });

  $('#form').on('submit', function (e) {
    e.preventDefault();
    $(this).ajaxSubmit();
  });
});

試してみる

  • ビルトインサーバ(php -S localhost:3000)を利用して接続を待ち受けさせる
  • localhost:3000/index.html にアクセス
  • アップロードするファイルを選択

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