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yaml-explorer.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>YAML Explorer</title>
<style>
* {
box-sizing: border-box;
}
body {
font-family: Helvetica, Arial, sans-serif;
line-height: 1.4;
margin: 0;
padding: 20px;
}
textarea, input[type="url"] {
width: 100%;
margin-bottom: 20px;
padding: 8px;
font-size: 16px;
font-family: monospace;
border: 1px solid #ccc;
border-radius: 4px;
}
button {
font-size: 16px;
padding: 0 20px;
background: #0066cc;
color: white;
border: none;
border-radius: 4px;
cursor: pointer;
min-width: 80px;
height: 37px; /* Match input height */
}
button:hover {
background: #0052a3;
}
button:active {
background: #004080;
}
textarea {
height: 200px;
}
.container {
max-width: 800px;
margin: 0 auto;
}
.output {
border: 1px solid #eee;
padding: 20px;
border-radius: 4px;
}
details {
margin: 0.5em 0;
padding-left: 20px;
}
summary {
margin-left: -20px;
cursor: pointer;
}
summary > span {
color: #666;
font-size: 0.9em;
}
.expand-all {
color: #0066cc;
cursor: pointer;
text-decoration: underline;
font-size: 0.9em;
margin-left: 8px;
}
.key {
color: #0066cc;
font-weight: bold;
}
.string {
color: #008000;
}
.number {
color: #ff6600;
}
.boolean {
color: #9933cc;
}
.null {
color: #999;
}
.error {
color: red;
margin: 1em 0;
}
</style>
</head>
<body>
<div class="container">
<h1>YAML Explorer</h1>
<div style="display: flex; gap: 8px;">
<input type="url" placeholder="Optional: Enter URL to YAML file" style="flex: 1;" />
<button type="button" style="font-size: 16px; padding: 0 16px;">Load</button>
</div>
<textarea placeholder="Paste your YAML here..."></textarea>
<div class="output"></div>
</div>
<script type="module">
import { load } from 'https://cdnjs.cloudflare.com/ajax/libs/js-yaml/4.1.0/js-yaml.mjs'
const urlInput = document.querySelector('input[type="url"]')
const textarea = document.querySelector('textarea')
const output = document.querySelector('.output')
// Create unique IDs for details elements to track state
let detailsCounter = 0
function createValueSpan(value) {
const span = document.createElement('span')
if (value === null) {
span.className = 'null'
span.textContent = 'null'
} else if (typeof value === 'string') {
span.className = 'string'
span.textContent = `"${value}"`
} else if (typeof value === 'number') {
span.className = 'number'
span.textContent = value
} else if (typeof value === 'boolean') {
span.className = 'boolean'
span.textContent = value
}
return span
}
function createExpandAllButton(parent) {
const button = document.createElement('span')
button.className = 'expand-all'
button.textContent = 'expand all'
button.onclick = (e) => {
e.preventDefault()
e.stopPropagation()
const allDetails = parent.querySelectorAll('details')
allDetails.forEach(d => d.open = true)
updateUrlState()
}
return button
}
function renderObject(obj) {
if (typeof obj !== 'object' || obj === null) {
return createValueSpan(obj)
}
const details = document.createElement('details')
const detailsId = `d${detailsCounter++}`
details.dataset.id = detailsId
details.addEventListener('toggle', updateUrlState)
const summary = document.createElement('summary')
const isArray = Array.isArray(obj)
const text = document.createElement('span')
text.textContent = isArray ?
`Array (${obj.length} items)` :
`Object (${Object.keys(obj).length} properties)`
summary.appendChild(text)
summary.appendChild(createExpandAllButton(details))
details.appendChild(summary)
const items = isArray ? obj : Object.entries(obj)
items.forEach((item, index) => {
const div = document.createElement('div')
if (isArray) {
div.appendChild(renderObject(item))
} else {
const [key, value] = item
const keySpan = document.createElement('span')
keySpan.className = 'key'
keySpan.textContent = `${key}: `
div.appendChild(keySpan)
div.appendChild(renderObject(value))
}
details.appendChild(div)
})
return details
}
function showError(message) {
const error = document.createElement('div')
error.className = 'error'
error.textContent = message
output.appendChild(error)
}
function updateUrlState() {
const url = urlInput.value
const openDetails = [...document.querySelectorAll('details[data-id]')]
.filter(d => d.open)
.map(d => d.dataset.id)
const state = {
url: url || undefined,
open: openDetails.length ? openDetails : undefined
}
const fragment = '#' + btoa(JSON.stringify(state))
window.history.replaceState(null, '', fragment)
}
function parseUrlState() {
try {
const fragment = window.location.hash.slice(1)
if (!fragment) return {}
return JSON.parse(atob(fragment))
} catch (e) {
console.warn('Failed to parse URL state:', e)
return {}
}
}
async function loadYaml(yaml) {
try {
output.innerHTML = ''
detailsCounter = 0
if (!yaml) return
const data = load(yaml)
const tree = renderObject(data)
output.appendChild(tree)
// Restore open state from URL if present
const state = parseUrlState()
if (state.open) {
state.open.forEach(id => {
const details = document.querySelector(`details[data-id="${id}"]`)
if (details) details.open = true
})
}
} catch (err) {
showError(`Error parsing YAML: ${err.message}`)
}
}
async function fetchAndLoadUrl(url) {
if (!url) return
try {
const response = await fetch(url)
if (!response.ok) {
throw new Error(`HTTP error! status: ${response.status}`)
}
const yaml = await response.text()
textarea.value = yaml
await loadYaml(yaml)
updateUrlState()
} catch (err) {
showError(`Error fetching YAML: ${err.message}`)
}
}
textarea.addEventListener('input', () => {
loadYaml(textarea.value.trim())
updateUrlState()
})
const loadButton = document.querySelector('button')
loadButton.addEventListener('click', () => {
fetchAndLoadUrl(urlInput.value)
})
// Initial load from URL state
const initialState = parseUrlState()
if (initialState.url) {
urlInput.value = initialState.url
fetchAndLoadUrl(initialState.url)
}
</script>
</body>
</html>