Bootstrap 4 input-group-append not working

Bootstrap 4 got out of alpha (4.1 at the time of this answer) and the following should work now:

  <div class="form-group">
    <label for="price">Price</label>
    <div class="input-group-btn">
      <div class="input-group-prepend">
        <span class="input-group-text">$</span>
        <input id="price" type="number" class="form-control" />
        <span class="input-group-text">.00</span>
      </div>
    </div> 
  </div>

So, use class input-group-btn along with input-group-prepend (or input-group-prepend) and input-group-text.

Check version 4.1 docs for Input Group here.

I just encountered this one today. I double checked my styles and scripts and everything is good. Instead of using the append and preped, I used the input-group-addon and input-group-btn.

Please see this link.

There wasn't any bugs.

You included a lot of unnecessaries. The jQuery are making lots of disruption. Be careful when adding scripts that may come into conflict. Refer to my code

<!doctype html>
<html lang="en">
<head>
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

    <!-- Bootstrap CSS -->
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.3/css/bootstrap.min.css" integrity="sha384-Zug+QiDoJOrZ5t4lssLdxGhVrurbmBWopoEl+M6BdEfwnCJZtKxi1KgxUyJq13dy" crossorigin="anonymous">

    <title>Starter Template for Bootstrap</title>


</head>

<body>

<nav class="navbar navbar-expand-md navbar-dark bg-dark fixed-top">
    <a class="navbar-brand" href="#">Navbar</a>
    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarsExampleDefault" aria-controls="navbarsExampleDefault" aria-expanded="false" aria-label="Toggle navigation">
        <span class="navbar-toggler-icon"></span>
    </button>

    <div class="collapse navbar-collapse" id="navbarsExampleDefault">
        <ul class="navbar-nav mr-auto">
            <li class="nav-item active">
                <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#">Link</a>
            </li>
            <li class="nav-item">
                <a class="nav-link disabled" href="#">Disabled</a>
            </li>
            <li class="nav-item dropdown">
                <a class="nav-link dropdown-toggle" href="http://example.com" id="dropdown01" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Dropdown</a>
                <div class="dropdown-menu" aria-labelledby="dropdown01">
                    <a class="dropdown-item" href="#">Action</a>
                    <a class="dropdown-item" href="#">Another action</a>
                    <a class="dropdown-item" href="#">Something else here</a>
                </div>
            </li>
        </ul>
        <form class="form-inline my-2 my-lg-0">
            <input class="form-control mr-sm-2" type="text" placeholder="Search" aria-label="Search">
            <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
        </form>
    </div>
</nav>

<main role="main" class="container">

    <div class="input-group mb-3">
        <div class="input-group-prepend">
            <span class="input-group-text" id="basic-addon1">@</span>
        </div>
        <input type="text" class="form-control" placeholder="Username" aria-label="Username" aria-describedby="basic-addon1">
    </div>

    <div class="input-group mb-3">
        <input type="text" class="form-control" placeholder="Recipient's username" aria-label="Recipient's username" aria-describedby="basic-addon2">
        <div class="input-group-append">
            <span class="input-group-text" id="basic-addon2">@example.com</span>
        </div>
    </div>

    <label for="basic-url">Your vanity URL</label>
    <div class="input-group mb-3">
        <div class="input-group-prepend">
            <span class="input-group-text" id="basic-addon3">https://example.com/users/</span>
        </div>
        <input type="text" class="form-control" id="basic-url" aria-describedby="basic-addon3">
    </div>

    <div class="input-group mb-3">
        <div class="input-group-prepend">
            <span class="input-group-text">$</span>
        </div>
        <input type="text" class="form-control" aria-label="Amount (to the nearest dollar)">
        <div class="input-group-append">
            <span class="input-group-text">.00</span>
        </div>
    </div>

</main><!-- /.container -->

<!-- Optional JavaScript -->
<!-- jQuery first, then Popper.js, then Bootstrap JS -->
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.3/js/bootstrap.min.js" integrity="sha384-a5N7Y/aK3qNeh15eJKGWxsqtnX/wWdSZSKp+81YjTmS15nvnvxKHuzaWwXHDli+4" crossorigin="anonymous"></script>

</body>
</html>

Bootstrap 4 input-group-append not working

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Jquery

Django

Twitter Bootstrap

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