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const frameHtml = `<!doctype html>
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<html>
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<head>
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<title>Frame</title>
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<style>
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html, body, iframe {
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margin: 0;
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padding: 0;
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width: 100%;
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height: 100%;
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}
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</style>
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</head>
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<body>
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<iframe srcdoc="" sandbox="allow-scripts"></iframe>
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<script type="module">
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const frame = document.getElementsByTagName('iframe')[0]
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addEventListener('message', event => {
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const d = event.data
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if (Array.isArray(d) && d[0] === 'srcdoc') {
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frame.srcdoc = d
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} else {
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frame.postMessage(event.data)
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}
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}
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</script>
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</body>
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</html>`
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export class Page extends HTMLElement {
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constructor() {
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super()
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const shadow = this.attachShadow({mode: 'open'})
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this.textArea = document.createElement('textarea')
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this.header = document.createElement('h1')
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this.textArea.addEventListener('input', e => {
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const path = this.getAttribute('path')
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localStorage.setItem(
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path,
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e.target.value
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)
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})
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const div = document.createElement('div')
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div.appendChild(this.header)
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div.appendChild(this.textArea)
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shadow.appendChild(div)
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}
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connectedCallback() {
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const path = this.getAttribute('path')
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this.header.innerText = path
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this.textArea.value = localStorage.getItem(
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path
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) ?? ''
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const style = document.createElement('style')
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style.textContent = `
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textarea {
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width: 80%;
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height: 45vh;
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}
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`
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this.shadowRoot.append(style)
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if (path.startsWith('/sandbox/')) {
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this.initFrame()
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}
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}
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initFrame() {
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const wrap = document.createElement('div')
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this.shadowRoot.appendChild(wrap)
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const tmp = document.createElement('iframe')
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tmp.sandbox = "allow-same-origin allow-scripts"
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const url = new URL(
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'/-/frame', location.href
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)
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url.searchParams.set(
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'csp',
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"default-src 'self'"
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)
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url.searchParams.set('html', frameHtml)
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tmp.src = url.href
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wrap.insertAdjacentHTML(
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'beforeend', tmp.outerHTML
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)
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const frames = wrap.getElementsByTagName('iframe')
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this.frame = frames[frames.length - 1]
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this.textArea.addEventListener('blur', e => {
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const msg = ['srcdoc', e.target.value]
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this.frame.contentWindow.postMessage(msg)
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})
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}
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}
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