jQuery html attributes with HTML?

Question

I'm using jQuery to make sure that my users can't execute javascript through my chat app. This is how I append the data that I get from WebSocket server to the users:

obj = JSON.parse(e.data);

    $("<li>", {
        class: "list-group-item",
        text: obj.username + ": " + obj.message
    }).prependTo('#chatlog');

This works great, and seems to escape all XSS attacks, but here's my problem. I want to make obj.username bold, but I have no idea how to go about doing that since everything after text: becomes text. Very happy for any help on this!

Answer 1

Then you can use another way:-

$("<li>", {
  class: "list-group-item",
}).append($('<span>', {
  class: 'font-weight-bold',
  text: obj.username
})).append($('<span>', {
  text: `: ${obj.message}`
})).prependTo('#chatlog');

See the snippet below:-

const obj = {
  username: 'John Doe',
  message: 'Hi!'
};

$("<li>", {
  class: "list-group-item",
}).append($('<span>', {
  class: 'font-weight-bold',
  text: obj.username
})).append($('<span>', {
  text: `: ${obj.message}`
})).prependTo('#chatlog');

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
<ul class="list-group" id="chatlog"></ul>