2025-grid-technique/9.html at main · codegrid/2025-grid-technique · GitHub

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<!DOCTYPE html>
<html lang="ja" prefix="og: http://ogp.me/ns#">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width,initial-scale=1.0" />
<meta name="format-detection" content="email=no,telephone=no,address=no" />
<title>=^.^=</title>
<style>

.inputWrapper {
  display: grid;
  grid-template-columns: min-content;
}

.inputWrapper::after {
  content: attr(data-value) "";
  visibility: hidden;
  white-space: pre;
  grid-area: 0 / 1;
  min-width: 1em;
}

.inputWrapper input {
  width: 100%;
  grid-area: 0 / 1;
  padding: 0;
  border: 1px solid #ccc;
  font: inherit;
}
</style>
<script type="module">
const inputWrapperEl = document.querySelector( '.inputWrapper' );
const inputEl = inputWrapperEl.querySelector( 'input' );

// [1 of 4] input 要素に入力したとき、inputWrapperEl の data 属性にその値をコピーする
inputEl.addEventListener( 'input', () => {

	inputWrapperEl.setAttribute( 'data-value', inputEl.value );

} );

</script>
</head>
<body>

<div class="inputWrapper" data-value="">
  <input>
</div>

</body>
</html>