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DOM を生成する便利関数

Last updated at Posted at 2019-09-29

Vanilla JS で DOM を生成したいときに便利な関数を作りました。

定義

h.js
/**
 * @template {keyof HTMLElementTagNameMap} K
 * @param {K} tagName
 * @param {Record<string, any>} options
 * @param {(string | Node)[]} children
 * @returns {HTMLElementTagNameMap[K]}
 */
function h(tagName, options = {}, ...children) {
  const element = document.createElement(tagName);
  element.append(...children);
  return Object.assign(element, options);
}
h.ts
function h<K extends keyof HTMLElementTagNameMap>(
  tagName: K,
  options: Record<string, any> = {},
  ...children: (string | Node)[]
): HTMLElementTagNameMap[K] {
  const element = document.createElement(tagName);
  element.append(...children);
  return Object.assign(element, options);
}

使い方

const hr = h('hr');
const img = h('img', { src: 'image.png', alt: 'イメージ' });
const a = h('a', { href: '/' }, 'TOPへ');

const div = h('div', { className: 'sample' }, img, hr, a);
const records = [
  [ 'Alice', 'alice@example.com' ],
  [ 'Bob', 'bob@example.com' ],
  [ 'Carol', 'carol@example.com' ],
];

h('table', {}, ...records.map(r =>
  h('tr', {}, ...r.map(v =>
    h('td', {}, v)
  ))
));

書き捨てのスクリプトなんかにどうぞ。

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