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index.html
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<!DOCTYPE html>
<html>
<head>
<title>BTC Order Books</title>
<!-- Bootstrap -->
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css"
integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">
<!-- jquery, popper, bootstrap JS -->
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js"
integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo"
crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js"
integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49"
crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js"
integrity="sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy"
crossorigin="anonymous"></script>
<!-- Styles -->
<link rel="stylesheet" href="css/style.css" />
<!-- Fontawesome -->
<script src="https://kit.fontawesome.com/84903da61a.js" crossorigin="anonymous"></script>
<!-- Google fonts -->
<link rel="preconnect" href="https://fonts.gstatic.com">
<link href="https://fonts.googleapis.com/css2?family=Source+Code+Pro:wght@200;400;600&display=swap"
rel="stylesheet">
</head>
<script src="http://localhost:8080/socket.io/socket.io.js"></script>
<script>
const socket = io();
socket.on("new_message", (data) => {
// clear the existing table
console.log("got data: ", data)
const message = data.message;
if (message.exchange && message.bids && message.asks) {
const exchange = message.exchange;
console.log("exchange: ", exchange);
const bids = message.bids;
const asks = message.asks;
const currentTime = new Date();
bids.forEach(bid => {
console.log("Bid " + bid.amountStr + "BTC at price " + bid.priceStr)
const order = `<i class="fas fa-tag"></i> bid <b>` + bid.amountStr + `</b> BTC at price <b><span style="color: red">` + formatCurrency(bid.priceStr, true) + `</span></b>`
bidsDiv.innerHTML += `<p style="margin: 0px"><span style="color:chartreuse"><b>[` + exchange + "]</b></span> " + currentTime + "</p>"
bidsDiv.innerHTML += "<p>" + order + "</p>"
bidsDiv.scrollTop = bidsDiv.scrollHeight;
});
asks.forEach(ask => {
const order = `<i class="fas fa-question-circle"></i> ask <b>` + ask.amountStr + `</b> BTC at price <b><span style="color: red">` + formatCurrency(ask.priceStr, true) + `</span></b>`
asksDiv.innerHTML += `<p style="margin: 0px"><span style="color:chartreuse"><b>[` + exchange + "]</b></span> " + currentTime + "</p>"
asksDiv.innerHTML += "<p>" + order + "</p>"
asksDiv.scrollTop = asksDiv.scrollHeight;
});
}
})
let formatCurrency = (amount, isUsd = true) => {
var formatted = amount;
if (parseInt(amount) >= 1000) {
formatted = amount.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",");
}
if (isUsd) {
return '$' + formatted;
} else {
return formatted;
}
}
</script>
<body>
<div id="topBanner">
<h1><i class="fab fa-bitcoin" style="color: goldenrod;"></i> Live BTC Order Book</h1>
<p class="font-weight-lighter">Real-time BTC market data</p>
</div>
<div class="row" id="orderBookDiv">
<div class="col-md-6">
<h3>Bids</h3>
<div id="bidsDiv" style="overflow-y: scroll; height:750px;"></div>
</div>
<div class="col-md-6">
<h3>Asks</h3>
<div id="asksDiv" style="overflow-y: scroll; height:750px;"></div>
</div>
</div>
</body>
</html>