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