回答編集履歴
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コード追記
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### コード
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- [datalist要素 + input event - JSFiddle](http://jsfiddle.net/817gtvr6/1/)
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```HTML
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<input list="testList" id="testId" name="testName" />
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<datalist id="testList">
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<option value="test1">
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<option value="test2">
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<option value="test3">
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<option value="test4">
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</datalist>
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<script>
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'use strcit';
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document.getElementById('testId').addEventListener('input', function handleInput (event) {
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console.log(event.target.value);
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}, false);
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</script>
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```
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### 参考
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- [4.10.8 datalist要素 - HTML Standard 日本語訳](https://momdo.github.io/html/form-elements.html#the-datalist-element)
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- [input event - Can I use...](https://caniuse.com/#feat=input-event)
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