example/playground.html

<html>
<head>
<style>
body {
  margin: 0;
  font-family: Menlo, monaco, Courier;
  font-size: 12px;
}
.container {
  padding: 10px;
  margin: 0 auto;
  padding-bottom: 200px;
  padding-top: 50px;
  max-width: 800px;
}
.row.noflex {
  display: block;
}
.row {
  display: flex;
  padding: 10px;
}
.row .item {
  flex-grow: 1;
}
.row .button.selected {
  background: gold;
}
.row h2 {
  font-size: 15px;
}
.row .button {
  text-align: center;
  color: black;
  padding: 20px;
  text-decoration: none;
  margin: 5px;
  border: 2px solid gray;
}
.row input[type=text], .row textarea {
  padding: 10px;
  text-align: left;
}
.row pre {
  background: #2a2a2a;
  color: silver;
  width: 100%;
  box-sizing: border-box;
  padding: 10px;
  border-radius: 3px;
  white-space: pre-wrap;
  white-space: -moz-pre-wrap;
  white-space: -pre-wrap;
  white-space: -o-pre-wrap;
  word-wrap: break-word;
}
#send {
  background: gold;
  padding: 20px;
  flex-grow: 1;
  text-decoration: none;
  text-align: center;
  color: black;
  font-weight: bold;
  font-size: 20px;
}
#txconfirmation a {
  padding: 50px;
  text-align: center;
  border: 2px dotted cornflowerblue;
  color: cornflowerblue;
  font-size: 14px;
  flex-grow: 1;
  font-weight: bold;
}
</style>
<meta name="viewport" content="width=device-width, initial-scale=1">
<script src="https://unpkg.com/datacash"></script>
<script>
var endpoint = "https://chainfeed.org/send";
var transaction = null;
var selected = null;
var sending = false;
document.addEventListener("DOMContentLoaded", function(event) {
  var messageEl = document.querySelector("#message");
  var keyEl = document.querySelector("#privatekey");
  var codeEl = document.querySelector("#code");
  var txEl = document.querySelector("#tx");
  var hexEl = document.querySelector("#hex");
  var memoEl = document.querySelector("#memo");
  var bpEl = document.querySelector("#blockpress");
  var sendEl = document.querySelector("#send");
  var confirmEl = document.querySelector("#txconfirmation");
  messageEl.oninput = function(e) {
    update()
  }
  keyEl.oninput = function(e) {
    update()
  }
  memoEl.onclick = function(e) {
    selected = '0x6d02'
    e.target.className = "button item selected";
    bpEl.className = "button item";
    update()
    return false;
  }
  bpEl.onclick = function(e) {
    selected = '0x8d02'
    e.target.className = "button item selected";
    memoEl.className = "button item";
    update()
    return false;
  }
  sendEl.onclick = function(e) {
    if (!sending) {
      var v = transaction.verify();
      if (typeof v === 'string') {
        alert(v);
      } else {
        e.target.textContent = "Sending...";
        sending = true;
        fetch(endpoint, {
          headers: { 'Content-type': 'application/json' },
          headers: {
            'Accept': 'application/json',
            'Content-Type': 'application/json'
          },
          method: 'POST',
          body: JSON.stringify({tx: transaction.toString()})
        })
        .then(function(res) {
          return res.json();
        })
        .then(function(response) {
          console.log("Response = ", response)
          e.target.textContent = "Sent!";
          confirmEl.innerHTML = "<a href='https://explorer.bitcoin.com/bch/tx/" + response.tx + "' target='_blank'>Success! Click to view Transaction</a>";
        })
      }
    }
    return false;
  }

  var update = function() {
    var dsl = {};
    if (selected) {
      if (messageEl.value.length > 0) {
        dsl.data = [selected, messageEl.value];
      }
      if (keyEl.value.length > 0) {
        dsl.cash = { key: keyEl.value }
      }
      codeEl.textContent = JSON.stringify(dsl, null, 2)
      datacash.build(dsl, function(err, tx) {
        transaction = tx;
        txEl.textContent = JSON.stringify(tx.toObject(), null, 2);
        hexEl.textContent = tx.toString()
      })
    }
  }
  update()
})
</script>
</head>
<body>
  <div class='container'>
    <div class='row noflex'>
      <h1>Bitcoin Cash Microblogging Playground</h1>
      This website uses an open source Bitcoin Cash library called <a href='https://github.com/unwriter/datacash'>Datacash</a> to construct and broadcast OP_RETURN Bitcoin Cash Transactions.<br><br>
      1. All the signing takes place 100% on the client side so your private key is safe. (Check out the source code to make sure)<br><br>
      2. After the signed transaction is constructed, you can broadcast it to Bitcoin Cash network by pressing the "Send" button. This will broadcast the signed transaction through a public JSON-RPC endpoint.
    </div>
    <div class='row'>
      <h2>Step 1. Select a protocol</h2>
    </div>
    <div class='row'>
      <a class='button item' href='#' id='memo'>Generate a post for Memo.cash</a>
      <a class='button item' href='#' id='blockpress'>Generate a post for Blockpress</a>
    </div>
    <div class='row'>
      <h2>Step 2. Write a message</h2>
    </div>
    <div class='row'>
      <textarea id='message' class='item' placeholder='write a message'></textarea>
    </div>
    <div class='row'>
      <h2>Step 3. Paste the private key</h2>
    </div>
    <div class='row'>
      <input type='text' id='privatekey' placeholder='enter private key' class='item'>
    </div>
    <div class='row'>
      <h2>Step 4. Review the DSL</h2>
    </div>
    <div class='row'>
      <pre id='code' class='item'>generated DSL will show up here</pre> 
    </div>
    <div class='row'>
      <h2>Step 5. The DSL generates the following transaction</h2>
    </div>
    <div class='row'>
      <pre id='tx' class='item'>generated Transaction will show up here</pre>
    </div>
    <div class='row'>
      <h2>Step 6. Send the hex encoded transaction!</h2>
    </div>
    <div class='row'>
      <pre id='hex' class='item'>a hex encoded version of the transaction will show up here</pre>
    </div>
    <div class='row'>
      <a href='#' id='send'>Send</a>
    </div>
    <div class='row' id='txconfirmation'>
    </div>
  </div>
</body>
</html>