Honestly, I would dump it in index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- The above 3 meta tags *must* come first in the head; any other head content must come *after* these tags -->
<title>Pete's Pet Shop</title>
<!-- Bootstrap -->
<link href="css/bootstrap.min.css" rel="stylesheet">
<!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
<!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
<!--[if lt IE 9]>
<script src="https://oss.maxcdn.com/html5shiv/3.7.3/html5shiv.min.js"></script>
<script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
<![endif]-->
</head>
<body>
<div class="container">
<div class="row">
<div class="col-xs-12 col-sm-8 col-sm-push-2">
<h1 class="text-center">Pete's Pet Shop</h1>
<hr/>
<br/>
</div>
</div>
<div id="petsRow" class="row">
<!-- PETS LOAD HERE -->
</div>
</div>
<div id="petTemplate" style="display: none;">
<div class="col-sm-6 col-md-4 col-lg-3">
<div class="panel panel-default panel-pet">
<div class="panel-heading">
<h3 class="panel-title">Scrappy</h3>
</div>
<div class="panel-body">
<img alt="140x140" data-src="holder.js/140x140" class="img-rounded img-center" style="width: 100%;" src="https://animalso.com/wp-content/uploads/2017/01/Golden-Retriever_6.jpg" data-holder-rendered="true">
<br/><br/>
<strong>Breed</strong>: <span class="pet-breed">Golden Retriever</span><br/>
<strong>Age</strong>: <span class="pet-age">3</span><br/>
<strong>Location</strong>: <span class="pet-location">Warren, MI</span><br/><br/>
<button class="btn btn-default btn-adopt" type="button" data-id="0">Adopt</button>
</div>
</div>
</div>
</div>
<!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<!-- Include all compiled plugins (below), or include individual files as needed -->
<script src="js/bootstrap.min.js"></script>
<script src="js/web3.min.js"></script>
<script src="js/truffle-contract.js"></script>
<script src="js/app.js"></script>
<script>
window.addEventListener('load', async () => {
// Modern dapp browsers...
if (window.ethereum) {
window.web3 = new Web3(ethereum);
try {
// Request account access if needed
await ethereum.enable();
// Acccounts now exposed
web3.eth.sendTransaction({/* ... */});
} catch (error) {
// User denied account access...
}
}
// Legacy dapp browsers...
else if (window.web3) {
window.web3 = new Web3(web3.currentProvider);
// Acccounts always exposed
web3.eth.sendTransaction({/* ... */});
}
// Non-dapp browsers...
else {
console.log('Non-Ethereum browser detected. You should consider trying MetaMask!');
}
})
</script>
</body>
</html>
Please let me know if that doesn't work. You can use good old es5 for this.
Just add
<script>
window.addEventListener('load', async () => {
// Modern dapp browsers...
if (window.ethereum) {
window.web3 = new Web3(ethereum);
try {
// Request account access if needed
await ethereum.enable();
// Acccounts now exposed
web3.eth.sendTransaction({/* ... */});
} catch (error) {
// User denied account access...
}
}
// Legacy dapp browsers...
else if (window.web3) {
window.web3 = new Web3(web3.currentProvider);
// Acccounts always exposed
web3.eth.sendTransaction({/* ... */});
}
// Non-dapp browsers...
else {
console.log('Non-Ethereum browser detected. You should consider trying MetaMask!');
}
})
</script>
somewhere in the index.html file
