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index.html
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<!-- https://github.com/simonw/datasette-lite -->
<!DOCTYPE html>
<html>
<head>
<title>St. Olaf Course Data</title>
<link rel="stylesheet" href="https://latest.datasette.io/-/static/app.css?cead5a">
<style>
#loading-indicator {
text-align: center;
}
#loading-indicator svg {
height: 20vh;
}
#loading-indicator textarea {
height: 40vh;
width: 90%;
padding: 1em;
background-color: #276890;
color: white;
border: 1px solid black;
overflow: auto;
outline: none;
resize: none;
opacity: 0.6;
font-size: min(3vw, 1.2em);
line-height: 1.8;
}
textarea#sql-editor {
padding: 0.5em;
font-size: 1em;
line-height: 1.4;
}
</style>
</head>
<body>
<div id="loading-indicator">
<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"
width="200px" height="200px" viewBox="0 0 100 100">
<g transform="rotate(0 50 50)">
<rect x="47" y="24" rx="3" ry="6" width="6" height="12" fill="#292664">
<animate attributeName="opacity" values="1;0" keyTimes="0;1" dur="1s" begin="-0.9166666666666666s" repeatCount="indefinite"></animate>
</rect>
</g><g transform="rotate(30 50 50)">
<rect x="47" y="24" rx="3" ry="6" width="6" height="12" fill="#292664">
<animate attributeName="opacity" values="1;0" keyTimes="0;1" dur="1s" begin="-0.8333333333333334s" repeatCount="indefinite"></animate>
</rect>
</g><g transform="rotate(60 50 50)">
<rect x="47" y="24" rx="3" ry="6" width="6" height="12" fill="#292664">
<animate attributeName="opacity" values="1;0" keyTimes="0;1" dur="1s" begin="-0.75s" repeatCount="indefinite"></animate>
</rect>
</g><g transform="rotate(90 50 50)">
<rect x="47" y="24" rx="3" ry="6" width="6" height="12" fill="#292664">
<animate attributeName="opacity" values="1;0" keyTimes="0;1" dur="1s" begin="-0.6666666666666666s" repeatCount="indefinite"></animate>
</rect>
</g><g transform="rotate(120 50 50)">
<rect x="47" y="24" rx="3" ry="6" width="6" height="12" fill="#292664">
<animate attributeName="opacity" values="1;0" keyTimes="0;1" dur="1s" begin="-0.5833333333333334s" repeatCount="indefinite"></animate>
</rect>
</g><g transform="rotate(150 50 50)">
<rect x="47" y="24" rx="3" ry="6" width="6" height="12" fill="#292664">
<animate attributeName="opacity" values="1;0" keyTimes="0;1" dur="1s" begin="-0.5s" repeatCount="indefinite"></animate>
</rect>
</g><g transform="rotate(180 50 50)">
<rect x="47" y="24" rx="3" ry="6" width="6" height="12" fill="#292664">
<animate attributeName="opacity" values="1;0" keyTimes="0;1" dur="1s" begin="-0.4166666666666667s" repeatCount="indefinite"></animate>
</rect>
</g><g transform="rotate(210 50 50)">
<rect x="47" y="24" rx="3" ry="6" width="6" height="12" fill="#292664">
<animate attributeName="opacity" values="1;0" keyTimes="0;1" dur="1s" begin="-0.3333333333333333s" repeatCount="indefinite"></animate>
</rect>
</g><g transform="rotate(240 50 50)">
<rect x="47" y="24" rx="3" ry="6" width="6" height="12" fill="#292664">
<animate attributeName="opacity" values="1;0" keyTimes="0;1" dur="1s" begin="-0.25s" repeatCount="indefinite"></animate>
</rect>
</g><g transform="rotate(270 50 50)">
<rect x="47" y="24" rx="3" ry="6" width="6" height="12" fill="#292664">
<animate attributeName="opacity" values="1;0" keyTimes="0;1" dur="1s" begin="-0.16666666666666666s" repeatCount="indefinite"></animate>
</rect>
</g><g transform="rotate(300 50 50)">
<rect x="47" y="24" rx="3" ry="6" width="6" height="12" fill="#292664">
<animate attributeName="opacity" values="1;0" keyTimes="0;1" dur="1s" begin="-0.08333333333333333s" repeatCount="indefinite"></animate>
</rect>
</g><g transform="rotate(330 50 50)">
<rect x="47" y="24" rx="3" ry="6" width="6" height="12" fill="#292664">
<animate attributeName="opacity" values="1;0" keyTimes="0;1" dur="1s" begin="0s" repeatCount="indefinite"></animate>
</rect>
</g>
</svg>
<textarea id="loading-logs">Loading...</textarea>
</div>
<script>
const datasetteWorker = new Worker("webworker.js");
const githubUrl = /^https:\/\/github.com\/(.*)\/(.*)\/blob\/(.*)(\?raw=true)?$/;
const gistUrl = /^https:\/\/gist.github.com\/(.*)\/(.*)$/;
function fixUrl(url) {
const githubMatch = githubUrl.exec(url);
if (githubMatch) {
return `https://raw.githubusercontent.com/${githubMatch[1]}/${githubMatch[2]}/${githubMatch[3]}`;
}
const gistMatch = gistUrl.exec(url);
if (gistMatch) {
return `https://gist.githubusercontent.com/${gistMatch[1]}/${gistMatch[2]}/raw`;
}
return url;
}
const urlParams = new URLSearchParams(location.search);
const sqliteUrl = fixUrl(urlParams.get('url'));
const memory = !!urlParams.get('memory');
const metadataUrl = fixUrl(urlParams.get('metadata'));
const sqlUrls = urlParams.getAll('sql').map(fixUrl);
const jsonUrls = urlParams.getAll('json').map(fixUrl);
const parquetUrls = urlParams.getAll('parquet').map(fixUrl);
/**
* St. Olaf course data: patch data urls
*/
const getCourseDataUrls = () => {
const currentYear = new Date().getFullYear()
const startYear = currentYear - 4
const termsUrl = 'https://stolaf.dev/course-data/terms'
const urls = Array.from({ length: currentYear - startYear + 1 }, (_, i) => startYear + i)
.flatMap(year => Array.from({ length: 5 }, (_, term) => `${termsUrl}/${year}${term + 1}.csv`))
// semesters without data cause datasette to panic so we remove this year's active summer terms to be careful
const truncatedUrls = urls.slice(0, -2)
return truncatedUrls
}
/**
* St. Olaf course data: Patch url query parameter defaults
*
* Since .db loading is supported in webworker.js via shouldLoadDefaults
* I tried to call `sources.push(['csv', getCourseDataUrls()])`
* in webworker > startDatasette > shouldLoadDefaults
* and the data seemed to load but the UI never showed it.
*
* Instead, we can patch the query parameters, which is how I'm reading
* Simon designed this to work from the start in the documentation
* https://github.com/simonw/datasette-lite/#loading-csv-data
*/
const csvUrlParams = urlParams.getAll('csv').map(fixUrl)
let csvUrls = []
if (csvUrlParams.length) {
csvUrls = csvUrlParams
} else if (!jsonUrls.length && !sqlUrls.length && !parquetUrls.length) {
csvUrls = getCourseDataUrls()
}
const installUrls = urlParams.getAll('install')
const ref = urlParams.get('ref');
datasetteWorker.postMessage({type: 'startup', ref, sqliteUrl, memory, csvUrls, sqlUrls, jsonUrls, parquetUrls, installUrls, metadataUrl});
let loadingLogs = ["Loading..."];
function escapeHtml(unsafe) {
return unsafe
.replace(/&/g, "&")
.replace(/</g, "<")
.replace(/>/g, ">")
.replace(/"/g, """)
.replace(/'/g, "'");
}
datasetteWorker.onmessage = (event) => {
var ta = document.getElementById('loading-logs');
if (event.data.type == 'log') {
loadingLogs.push(event.data.line);
ta.value = loadingLogs.join("\n");
ta.scrollTop = ta.scrollHeight;
return;
}
let html = '';
if (event.data.error) {
html = `<div style="padding: 0.5em"><h3>Error</h3><pre style="white-space: pre-wrap">${escapeHtml(event.data.error)}</pre></div>`;
} else if (/^text\/html/.exec(event.data.contentType)) {
html = event.data.text;
} else if (/^application\/json/.exec(event.data.contentType)) {
html = `<pre style="padding: 0.5em">${escapeHtml(JSON.stringify(JSON.parse(event.data.text), null, 4))}</pre>`;
} else {
html = `<pre style="padding: 0.5em">${escapeHtml(event.data.text)}</pre>`;
}
document.getElementById("output").innerHTML = html;
let title = document.getElementById("output").querySelector("title");
if (title) {
document.title = title.innerText;
}
window.scrollTo({top: 0, left: 0});
document.getElementById('loading-indicator').style.display = 'none';
};
</script>
<div id="output"></div>
<form id="load-custom">
<p style="padding: 1em">
<button type="button" class="db-url">Load SQLite DB by URL</button>
<button type="button" class="csv-url">Load CSV</button>
<button type="button" class="json-url">Load JSON</button>
<button type="button" class="parquet-url">Load Parquet</button>
<button type="button" class="sql-url">Load SQL</button>
<a style="text-decoration: none; padding-left: 0.3em; color: #067EFF" href="https://github.com/simonw/datasette-lite">Documentation</a>
</p>
</form>
<script>
window.onpopstate = function(event) {
console.log(event);
datasetteWorker.postMessage({path: event.target.location.hash.split("#")[1] || ""});
}
// Start with path from location.hash, if available
if (location.hash) {
datasetteWorker.postMessage({path: location.hash.replace(/^\#/, '')});
} else {
datasetteWorker.postMessage({path: "/"});
}
function isExternal(url) {
let startsWithProtocol = !!/^http:\/\/|https:\/\//.exec(url);
if (!startsWithProtocol) {
return false;
}
// Is it localhost?
return new URL(url).host != 'localhost';
}
function isFragmentLink(url) {
// Is this a #fragment on the current page?
let u = new URL(url);
return (
location.pathname == u.pathname &&
location.hostname == u.hostname &&
u.hash &&
u.hash != location.hash
);
}
function loadPath(path) {
path = path.split("#")[0].replace("http://localhost", "");
console.log({path});
history.pushState({path: path}, path, "#" + path);
datasetteWorker.postMessage({path});
}
let output = document.getElementById('output');
output.addEventListener('click', (ev => {
var link = ev.srcElement.closest("a");
if (link && link.href) {
ev.stopPropagation();
ev.preventDefault();
if (isFragmentLink(link.href)) {
// Jump them to that element, but don't update the URL bar
// since we use # in the URL to mean something else
let fragment = new URL(link.href).hash.replace("#", "");
if (fragment) {
let el = document.getElementById(fragment);
el.scrollIntoView();
}
return;
}
let href = link.getAttribute("href");
if (isExternal(href)) {
window.open(href);
return;
}
loadPath(href);
}
}), true);
output.addEventListener('submit', (ev => {
console.log(ev);
ev.stopPropagation();
ev.preventDefault();
if (ev.target && ev.target.nodeName == "FORM" && ev.target.method.toLowerCase() == "get") {
let qs = new URLSearchParams(new FormData(ev.target)).toString();
let action = ev.target.getAttribute("action");
loadPath(`${action}?${qs}`);
}
}), true);
async function checkUrl(url, contentTypes) {
try {
response = (await fetch(url, {method: 'HEAD'}));
if (response.status != 200) {
return false;
}
if (contentTypes && (!contentTypes.includes(response.headers.get('content-type')))) {
return false;
}
return true;
} catch (error) {
console.error(error);
return false;
}
}
const fileTypes = [
{
id: "db-url",
prompt: "Enter a full URL to a SQLite .db file",
param: "url",
mimes: [
"application/octet-stream",
"application/x-sqlite3",
"application/vnd.sqlite3",
],
},
{ id: "csv-url", prompt: "Enter a full URL to a CSV file", param: "csv" },
{ id: "json-url", prompt: "Enter a full URL to a JSON file", param: "json" },
{
id: "parquet-url",
prompt: "Enter a full URL to a Parquet file",
param: "parquet",
},
{ id: "sql-url", prompt: "Enter a full URL to a SQL file", param: "sql" },
];
fileTypes.forEach((fileType) => {
document
.querySelector(`#load-custom button.${fileType.id}`)
.addEventListener("click", async function (ev) {
ev.preventDefault();
let url = fixUrl(prompt(fileType.prompt));
if (!url) {
return;
}
let valid = await checkUrl(url, fileType.mimes);
if (valid) {
location.href =
location.pathname +
"?" +
fileType.param +
"=" +
encodeURIComponent(url);
} else {
alert(`That ${fileType.param.toUpperCase()} could not be loaded`);
}
});
});
</script>
</body>
</html>