回答編集履歴
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FormData
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@@ -1,13 +1,84 @@
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### HTMLFormElement.elements
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見たところ、`[name="database"]` は `.gpa` 直下にしか存在しないので、classで制限するまでもなく、下記コードでいいのではないでしょうか。
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```JavaScript
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document.getElementById('insert_form').elements['database']
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```
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### querySelectorAll
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class で制限するなら、`querySelectorAll` を使ってください。
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```JavaScript
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document.querySelectorAll('.gpa>[name="database"]')
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```
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### FormData
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IE11- 用に Polyfill が必要ですが、FormData を使うと、楽ですね。
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- [jimmywarting/FormData: HTML5 `FormData` polyfill for Browsers.](https://github.com/jimmywarting/FormData)
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```HTML
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<form method="POST" name="insert" action="insert.php" onsubmit="count()" id="insert_form">
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<table id="insert">
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<thead>
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<tr>
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<th>科目情報</th>
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<th>成績評価</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>データベース</td>
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<td class="gpa">
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<input type="radio" id="zero_database" name="database" value="0" checked>
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<label for="zero_database">不可</label>
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<input type="radio" id="one_database" name="database" value="1">
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<label for="one_database">可</label>
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<input type="radio" id="two_database" name="database" value="2">
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<label for="two_database">良</label>
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<input type="radio" id="three_database" name="database" value="3">
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<label for="three_database">優</label>
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<input type="radio" id="four_database" name="database" value="4">
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<label for="four_database">秀</label>
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<input type="radio" id="none_database" name="database">
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<label for="none_database">取得していない</label>
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<input type="hidden" class="count" value="2">
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</td>
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</tr>
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<tr>
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<td>微積分</td>
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<td class="gpa">
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<input type="radio" id="zero_Calculus" name="Calculus" value="0" checked>
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<label for="zero_Calculus">不可</label>
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<input type="radio" id="one_Calculus" name="Calculus" value="1">
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<label for="one_Calculus">可</label>
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<input type="radio" id="two_Calculus" name="Calculus" value="2">
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<label for="two_Calculus">良</label>
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<input type="radio" id="three_Calculus" name="Calculus" value="3">
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<label for="three_Calculus">優</label>
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<input type="radio" id="four_Calculus" name="Calculus" value="4">
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<label for="four_Calculus">秀</label>
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<input type="radio" id="none_Calculus" name="Calculus">
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<label for="none_Calculus">取得していない</label>
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<input type="hidden" class="count" value="1">
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</td>
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</tr>
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</tbody>
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</table>
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<input type="submit" value="送信">
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</form>
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<script>
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'use strict';
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var formData = new FormData(document.getElementById('insert_form'));
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console.log(formData.get('database')); // "0"
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console.log(formData.get('Calculus')); // "0"
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</script>
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```
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Re: imaharu さん
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