Official Go implementation of the Ethereum protocol
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go-ethereum/cmd/mist/assets/examples/whisper.html

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<!doctype>
<html>
<title>Whisper test</title>
<head>
<script type="text/javascript" src="../ext/bignumber.min.js"></script>
<script type="text/javascript" src="../ext/ethereum.js/dist/ethereum.js"></script>
</head>
<body>
<h1>Whisper test</h1>
<button onclick="test()">Send</button>
<table width="100%" id="table">
<tr>
<td>ID</td>
<td id="id"></td>
</tr>
</table>
</body>
<script type="text/javascript">
var web3 = require('web3');
web3.setProvider(new web3.providers.HttpSyncProvider('http://localhost:8080'));
var shh = web3.shh;
var id = shh.newIdentity();
document.querySelector("#id").innerHTML = id;
shh.watch({topics: ["test"]}).arrived(function(message) {
document.querySelector("#table").innerHTML += "<tr><td colspan='2'>"+JSON.stringify(message)+"</td></tr>";
});
function test() {
shh.post({topics: ["test"], payload: web3.fromAscii("test it")})
}
</script>
</html>