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function render(element, parentDom) { | |
const { type, props } = element; | |
// Create DOM element | |
const isTextElement = type === "TEXT ELEMENT"; | |
const dom = isTextElement | |
? document.createTextNode("") | |
: document.createElement(type); | |
// Add event listeners | |
const isListener = name => name.startsWith("on"); | |
Object.keys(props).filter(isListener).forEach(name => { | |
const eventType = name.toLowerCase().substring(2); | |
dom.addEventListener(eventType, props[name]); | |
}); | |
// Set properties | |
const isAttribute = name => !isListener(name) && name != "children"; | |
Object.keys(props).filter(isAttribute).forEach(name => { | |
dom[name] = props[name]; | |
}); | |
// Render children | |
const childElements = props.children || []; | |
childElements.forEach(childElement => render(childElement, dom)); | |
// Append to parent | |
parentDom.appendChild(dom); | |
} |
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