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renderElement javascript Code Snippet in 2022

browserrecursionadvanced

Last Updated: 28 December 2022

Renders the given DOM tree in the specified DOM element.

  • Destructure the first argument into type and props. Use type to determine if the given element is a text element.
  • Based on the element's type, use either Document.createTextNode() or Document.createElement() to create the DOM element.
  • Use Object.keys() to add attributes to the DOM element and set event listeners, as necessary.
  • Use recursion to render props.children, if any.
  • Finally, use Node.appendChild() to append the DOM element to the specified container.
const renderElement = ({ type, props = {} }, container) => { const isTextElement = !type; const element = isTextElement ? document.createTextNode('') : document.createElement(type); const isListener = p => p.startsWith('on'); const isAttribute = p => !isListener(p) && p !== 'children'; Object.keys(props).forEach(p => { if (isAttribute(p)) element[p] = props[p]; if (!isTextElement && isListener(p)) element.addEventListener(p.toLowerCase().slice(2), props[p]); }); if (!isTextElement && props.children && props.children.length) props.children.forEach(childElement => renderElement(childElement, element) ); container.appendChild(element); };
const myElement = { type: 'button', props: { type: 'button', className: 'btn', onClick: () => alert('Clicked'), children: [{ props: { nodeValue: 'Click me' } }] } }; renderElement(myElement, document.body);

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