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import { preProcess } from '../utils/data-pre-processing.util.js'
/** @type {WeakMap<QRCodeElement, QrCode>} */
const qrCodeData = new WeakMap()
const EC_LEVEL_ATTR = 'data-error-correction-level'
const DATA_WHITESPACE_ATTR = 'data-whitespace'
export class QRCodeElement extends HTMLElement {
constructor () {
super()
const shadowRoot = this.attachShadow({ mode: 'open' })
import('./qr-code.async-loader.js').then(({ loadStyles }) => {
shadowRoot.adoptedStyleSheets = [loadStyles()]
})
observer.observe(this, observerOptions)
}
static async loadJsAPI () {
return await import('./qr-code.async-loader.js')
}
connectedCallback () {
applyQrCode(this)
}
get qrCodeContent () {
const content = queryQrContent(this)
return content && content.length === 1 ? content[0] : content
}
get errorCorrectionLevel () {
const errorCorrectionLevelAttr = this.getAttribute(EC_LEVEL_ATTR)
return errorCorrectionLevelAttr && isValidECLevel(errorCorrectionLevelAttr) ? errorCorrectionLevelAttr : 'Medium'
}
set errorCorrectionLevel (errorCorrectionLevel) {
if (isValidECLevel(errorCorrectionLevel)) {
this.setAttribute(EC_LEVEL_ATTR, errorCorrectionLevel)
}
}
}
/** @type {MutationObserverInit} */
const observerOptions = {
characterData: true,
characterDataOldValue: true,
childList: true,
attributes: true,
subtree: true,
}
const observer = new MutationObserver((records) => {
const updatedNodes = new Set()
for (const record of records) {
const { target } = record
if (target instanceof QRCodeElement) {
updatedNodes.add(target)
} else if (target.nodeType === Node.TEXT_NODE) {
const { parentElement } = target
if (parentElement instanceof QRCodeElement) {
updatedNodes.add(target.parentElement)
}
if (parentElement instanceof HTMLDataElement && parentElement.parentElement instanceof QRCodeElement) {
updatedNodes.add(parentElement.parentElement)
}
} else if (target instanceof HTMLDataElement && target.parentElement instanceof QRCodeElement) {
updatedNodes.add(target.parentElement)
}
}
updatedNodes.forEach(el => el instanceof QRCodeElement && applyQrCode(el))
})
/**
* @param {QRCodeElement} element - target QRCodeElement component element
*/
async function applyQrCode (element) {
const { QrCode, parseQrCodeColorsFromElement, parseQrCodeStylesFromElement, createSvgTag, createImgTag } = await import('./qr-code.async-loader.js')
const typeNumber = 0
const { shadowRoot } = element
if (!shadowRoot) {
return
}
const { qrCodeContent } = element
if (!qrCodeContent) {
return
}
const oldQr = qrCodeData.get(element)
const qr = new QrCode(typeNumber, element.errorCorrectionLevel)
for (const content of [qrCodeContent].flat()) {
qr.addData(content)
}
qr.make()
qrCodeData.set(element, qr)
const colors = parseQrCodeColorsFromElement(element)
const style = parseQrCodeStylesFromElement(element)
const marginComputedStyle = getComputedStyle(element).getPropertyValue('--qrcode-margin').trim()
const cellSize = 2
const margin = /^\d+$/.test(marginComputedStyle) ? +marginComputedStyle * cellSize : undefined
const renderMode = getRenderMode(element)
if (renderMode === 'svg') {
const svg = createSvgTag({ qrcode: qr, colors, cellSize, margin, scalable: isResizeEnabled(element), style })
shadowRoot.innerHTML = svg
return
}
const imgHtml = createImgTag({ qrcode: qr, colors, cellSize, margin, style })
const oldImgElement = shadowRoot.querySelector('img')
if (oldImgElement) {
const updated = updateImgElement(oldImgElement, imgHtml)
if (!updated) {
shadowRoot.innerHTML = imgHtml
}
} else {
shadowRoot.innerHTML = imgHtml
}
if (oldQr && (oldQr.dataList.length !== qr.dataList.length || oldQr.dataList.some((val, index) => val.data !== qr.dataList[index].data))) {
const customEvent = new CustomEvent('qrcode-content-change', { detail: { previousQRCode: oldQr, qrCode: qr } })
element.dispatchEvent(customEvent)
}
}
const correctionLevelNames = new Set(['Medium', 'Low', 'High', 'Quartile'].flatMap(ec => [ec.toUpperCase(), ec[0]]))
/**
* @param {string} ecLevel - Error correction level to validate
*/
function isValidECLevel (ecLevel) {
return correctionLevelNames.has(ecLevel.toUpperCase())
}
/**
* QR Code can have multiple data inside it, for that reason there are 2 structures this element supports:
*
* 1. Using textContent - gets the element text content, processes the whitespace and converts to a QR Code image
* 2. Using <data> child elements - each child element will be processed the join together before converting to a QR Code image
*
* It is possible to have both, but when it happens, <data> will take priority, and the text content in the element is to be ignored
* @param {QRCodeElement} element - target qr code element
* @returns {string[] | null} QR code contents
*/
function queryQrContent (element) {
const dataChildElements = element.querySelectorAll(':scope > data')
if (dataChildElements.length > 0) {
const contentArray = Array.from(dataChildElements).map(dataChild => {
const { textContent } = dataChild
if (!textContent) { return '' }
const preProcessAttr = dataChild.hasAttribute(DATA_WHITESPACE_ATTR) ? dataChild.getAttribute(DATA_WHITESPACE_ATTR) : element.getAttribute(DATA_WHITESPACE_ATTR)
return preProcess(textContent, preProcessAttr || '')
}).filter(content => content !== '')
return contentArray.length > 0 ? contentArray : null
}
const { textContent } = element
return textContent ? [preProcess(textContent, element.getAttribute(DATA_WHITESPACE_ATTR) || '')] : null
}
/**
* Updates the image element.
*
* Replacing the element with another <img> will make the image flash and re-render twice,
* one for the updated HTML without the previous image, as it is loading, and another time with the loaded image, this
* will make it update once without making it flash
* @param {HTMLImageElement} imageElement - target <img> element
* @param {string} imgHtml img rendered with {@link createImgTag}
* @returns {boolean} true if updated correctly, false if something failed. If false, applyQrCode() will fallback to replace the <img>
*/
function updateImgElement (imageElement, imgHtml) {
const imgDom = new DOMParser().parseFromString(imgHtml, 'text/html').querySelector('img')
if (!imgDom) {
return false
}
imageElement.src = imgDom.src
imageElement.width = imgDom.width
imageElement.height = imgDom.height
return true
}
/**
* Gets the render mode to be used:
* - if mode is "raster", it will render the qrcode as an rasterized image
* - if mode is "svg", it will render the qrcode as a scalable image using SVG
* @param {QRCodeElement} element - target qr code element
* @returns {"raster"|"svg"} render mode
*/
function getRenderMode (element) {
const renderModeCss = (getComputedStyle(element).getPropertyValue('--qrcode-render') || '').trim().toLowerCase()
if (renderModeCss === 'svg') return 'svg'
if (renderModeCss === 'raster') return 'raster'
if (isResizeEnabled(element)) return 'svg'
return 'raster'
}
/**
* @param {QRCodeElement} element - target qr code element
* @returns {boolean} true if resize enabled
*/
function isResizeEnabled (element) {
const resizeCss = (getComputedStyle(element).getPropertyValue('--qrcode-resize') || '').trim().toLowerCase()
return resizeCss === 'true' || resizeCss === 'yes' || resizeCss === 'enabled' || resizeCss === 'enable'
}
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