sign-and-post-transaction.js

document.getElementById("sign-and-post-transaction").addEventListener("click", function(event) {

  signedTx = wallet.signWith(newTx, [address]);
  signedTxHex = signedTx.toHex();

  xhr({
    uri: '/chain/:blockchainType/transactions/send',
    method: 'POST',
    json: {
      transactionHex: signedTxHex
    }
  }, function(err, resp, body) {
    postTransactionReceipt = body;
    document.getElementById("post-transaction-receipt").innerHTML = postTransactionReceipt;
  });

});