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52 lines
2.1 KiB
HTML
52 lines
2.1 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<title>example</title>
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<meta charset="utf-8" />
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<meta http-equiv="X-UA-Compatible" content="IE=edge" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<style>
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#container { margin-right: auto; margin-left: auto; max-width: 480px; }
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#info { background: #e0f0f0; border-radius: .5em; padding: 2em; }
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#static, #live { background: #f0f0f0; border-radius: .5em; padding: 0.5em; max-height: 10em; overflow: auto; height: 100%; }
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#wrapper { display: flex; justify-content: flex-evenly; margin-top: 1em; }
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</style>
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</head>
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<body>
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<div id="container">
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<div id="info">
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A div below shows file log.txt, which is produced by the server.
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The server appends a new log message to that file every second,
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and a div below also shows that, implementing a "live log" feature.
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JS code on this page first fetches /api/log/static that returns
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log.txt contents, then fetches /api/log/live that does not return,
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but feeds chunks of data as they arrive (live log).
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<br/><br/>
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You can also use <code>curl</code> command-line utility to see
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live logs:
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<br/><code>curl localhost:8000/api/log/live</code>
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</div>
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<div id="wrapper">
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<div style="width: 50%"><b>Static</b><pre id="static"></pre></div>
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<div style="width: 1em;"></div>
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<div style="width: 50%"><b>Live</b><pre id="live"></pre></div>
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</div>
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</div>
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</body>
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<script>
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var f = function(r) {
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return r.read().then(function(result) {
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var data = String.fromCharCode.apply(null, result.value);
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document.getElementById('live').innerText += data; // Append live log
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if (!result.done) f(r); // Read next chunk
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});
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};
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window.onload = ev => fetch('/api/log/static')
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.then(r => r.text())
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.then(r => { document.getElementById('static').innerText = r; })
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.then(r => fetch('/api/log/live'))
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.then(r => r.body.getReader())
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.then(f);
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</script>
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</html>
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