87 lines
3 KiB
JavaScript
87 lines
3 KiB
JavaScript
/*
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A functional HTML generation library.
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Example:
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html.label(
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html.span("Delete everything", {class: ["warning", "important"]}),
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html.button("Click", {onClick: e => document.body.innerHTML=""}),
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)
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or
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html.ul([1, 2, 3, 4, 5].map(x => html.li(x)), {class: "numbers"})
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*/
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const keyToPropName = key => key.replace(/^[A-Z]/, a => "-"+a).replace(/[A-Z]/g, a => '-'+a.toLowerCase())
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const insertStyles = (rule, styles) => {
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for (let [key, value] of Object.entries(styles))
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if (typeof value == "undefined")
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rule.removeProperty(keyToPropName(key))
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else
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rule.setProperty(keyToPropName(key), value.toString())
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}
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const parseAttribute = (attribute) => {
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if (typeof attribute == "string" || typeof attribute == "number")
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return attribute
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else if ("join" in attribute)
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return attribute.join(" ")
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else
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return JSON.stringify(attribute)
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}
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const createPromiseNode = promise => {
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const comment = document.createComment(`Awaiting ${promise}`)
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promise.then(result => {parseArgs(comment.parentNode, comment, result); comment.remove()})
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return comment
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}
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const parseArgs = (element, before, ...args) => {
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if (element.content) element = element.content
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for (let arg of args)
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if (typeof arg == "string" || typeof arg == "number")
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element.insertBefore(document.createTextNode(arg), before)
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else if (typeof arg == "function")
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arg(element)
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else if ("nodeName" in arg)
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element.insertBefore(arg, before)
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else if (arg.constructor?.name === "Promise")
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element.insertBefore(createPromiseNode(arg), before)
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else if ("length" in arg)
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parseArgs(element, before, ...arg)
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else
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for (let key in arg)
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if (key == "style" && typeof(arg[key])=="object")
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insertStyles(element.style, arg[key])
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else if (key == "dataset" && typeof(arg[key])=="object")
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for (let [key2, value] of Object.entries(arg[key]))
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element.dataset[key2] = parseAttribute(value)
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else if (key == "shadowRoot")
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parseArgs((element.shadowRoot || element.attachShadow({mode: "open"})), null, arg[key])
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else if (typeof arg[key] === "function")
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element.addEventListener(key.replace(/^on[A-Z]/, x => x.charAt(x.length-1).toLowerCase()), arg[key])
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else if (arg[key] === true)
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{if (!element.hasAttribute(key)) element.setAttribute(key, '')}
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else if (arg[key] === false)
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element.removeAttribute(key)
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else
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element.setAttribute(key, parseAttribute(arg[key]))
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}
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const node = (name, args, options) => {
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let element
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if (options.nameFilter) name = options.nameFilter(name)
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if (options.xmlns)
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element = document.createElementNS(options.xmlns, name)
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else
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element = document.createElement(name)
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parseArgs(element, null, args)
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return element
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}
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const nameSpacedProxy = (options={}) => new Proxy(Window, {
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get: (target, prop, receiver) => { return (...args) => node(prop, args, options) },
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has: (target, prop) => true,
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})
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export const html = nameSpacedProxy({nameFilter: name => name.replace(/([a-z])([A-Z])/g, "$1-$2").toLowerCase()})
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export const svg = nameSpacedProxy({xmlns: "http://www.w3.org/2000/svg"})
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