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+<!doctype>
+<html>
+
+<head>
+<script type="text/javascript" src="js/bignumber.js/bignumber.min.js"></script>
+<script type="text/javascript" src="../dist/ethereum.js"></script>
+<script type="text/javascript">
+
+ var web3 = require('web3');
+ web3.setProvider(new web3.providers.HttpSyncProvider('http://localhost:8080'));
+
+ function watchBalance() {
+ var coinbase = web3.eth.coinbase;
+ var originalBalance = 0;
+
+ var balance = web3.eth.balanceAt(coinbase);
+ var originalBalance = web3.toDecimal(balance);
+ document.getElementById('original').innerText = 'original balance: ' + originalBalance + ' watching...';
+
+ web3.eth.watch({altered: coinbase}).changed(function() {
+ balance = web3.eth.balanceAt(coinbase)
+ var currentBalance = web3.toDecimal(balance);
+ document.getElementById("current").innerText = 'current: ' + currentBalance;
+ document.getElementById("diff").innerText = 'diff: ' + (currentBalance - originalBalance);
+ });
+ }
+
+</script>
+</head>
+<body>
+ <h1>coinbase balance</h1>
+ <button type="button" onClick="watchBalance();">watch balance</button>
+ <div></div>
+ <div id="original"></div>
+ <div id="current"></div>
+ <div id="diff"></div>
+</body>
+</html>
+