Le Tutoriel de Bootstrap Input Group

Input Group
Input Group with Checkbox, Radio
Input Group avec Button
Input Group avec Dropdown
Input Group avec Select
Input Group avec Custom File
La taille de Input Group

1. Input Group

Voir aussi la façon d'utiliser les contrôles de Form et de Input Control dans Bootstrap :
Le Tutoriel de Bootstrap Form

Input Group est la façon de vous aider à étendre (extend) un Input Control en ajoutant des éléments tels que Texte, Bouton, ou Button Group,... Les éléments ajoutés à côté du Input Control sont appelés Addons.

input-group-example.html

<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <title>Input Group Example</title>
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
</head>

<body>
    <div class="container">
        <h2 class="mb-4 mt-2">Input Group Examples</h2>

        <div class="input-group mb-3">
            <div class="input-group-prepend">
                <span class="input-group-text">@</span>
            </div>
            <input type="text" class="form-control" placeholder="Username">
        </div>

        <div class="input-group mb-3">
            <input type="text" class="form-control" placeholder="Recipient's username">
            <div class="input-group-append">
                <span class="input-group-text">@example.com</span>
            </div>
        </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">
            <div class="input-group-append">
                <span class="input-group-text">.00</span>
            </div>
        </div>

    </div>

    <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js"></script>
    <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"></script>

</body>
</html>

Vous pouvez mettre plusieurs Input Control ou plusieurs Addon dans un Input Group :

<!-- Multiple inputs -->
<form>
    <div class="input-group mb-3">
        <div class="input-group-prepend">
            <span class="input-group-text">Person</span>
        </div>
        <input type="text" class="form-control" placeholder="First Name">
        <input type="text" class="form-control" placeholder="Last Name">
    </div>
</form>

<!-- Multiple addons / help text -->
<form>
    <div class="input-group mb-3">
        <div class="input-group-prepend">
            <span class="input-group-text">One</span>
            <span class="input-group-text">Two</span>
            <span class="input-group-text">Three</span>
        </div>
        <input type="text" class="form-control">
    </div>
</form>

Remarque : Les attributs aria-label, aria-describedby peuvent être utilisés si vous voulez que votre application supporte au mieux l'équipement tel que Screen Reader (lecteur d'écran pour les aveugles).
<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>

2. Input Group with Checkbox, Radio

Par exemple, Input Group avec Addon sont checkbox ou radio :

<div class="input-group mb-3">
    <div class="input-group-prepend">
        <div class="input-group-text">
            <input type="checkbox">
        </div>
    </div>
    <input type="text" class="form-control" placeholder="Some text">
</div>

<div class="input-group mb-3">
    <div class="input-group-prepend">
        <span class="input-group-text">Gender:</span>
        <div class="input-group-text">
            <input type="radio" name="gender" value="male">
        </div>
        <span class="input-group-text">Male</span>
        <div class="input-group-text">
            <input type="radio" name="gender" value="female">
        </div>
        <span class="input-group-text">Female</span>
    </div>
    <input type="text" class="form-control" placeholder="Some text">
</div>

3. Input Group avec Button

Ajoutz un ou plusieurs Button au Input Group :

<div class="input-group mb-3">
    <div class="input-group-prepend">
        <button class="btn btn-outline-primary" type="button">Basic Button</button>
    </div>
    <input type="text" class="form-control" placeholder="Some text">
</div>

<div class="input-group mb-3">
    <input type="text" class="form-control" placeholder="Search">
    <div class="input-group-append">
        <button class="btn btn-success" type="submit">Go</button>
    </div>
</div>

<div class="input-group mb-3">
    <input type="text" class="form-control" placeholder="Something clever..">
    <div class="input-group-append">
        <button class="btn btn-primary" type="button">OK</button>
        <button class="btn btn-danger" type="button">Cancel</button>
    </div>
</div>

4. Input Group avec Dropdown

Ajoutez Dropdown à un Input Group.

<div class="input-group mb-3">
    <div class="input-group-prepend">
        <div class="btn-group">
            <button class="btn btn-primary dropdown-toggle" type="button" data-toggle="dropdown">
                Tutorials
            </button>
            <div class="dropdown-menu">
                <a class="dropdown-item" href="#">Javascript</a>
                <a class="dropdown-item" href="#">Css</a>
                <div class="dropdown-divider"></div>
                <a class="dropdown-item" href="#">Bootstrap</a>
            </div>
        </div>
    </div>
    <input type="text" class="form-control" placeholder="Some text">
</div>

<div class="input-group mb-3">
    <div class="input-group-prepend">
        <div class="btn-group">

            <button type="button" class="btn btn-success">Go to Home Page</button>
            <button type="button" class="btn btn-primary dropdown-toggle dropdown-toggle-split"
                    data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                <span class="sr-only">Toggle Dropdown</span>
            </button>

            <div class="dropdown-menu">
                <a class="dropdown-item" href="#">Javascript</a>
                <a class="dropdown-item" href="#">Css</a>
                <div class="dropdown-divider"></div>
                <a class="dropdown-item" href="#">Bootstrap</a>
            </div>

        </div>
    </div>
    <input type="text" class="form-control" placeholder="Some text">
</div>

Voir plus :
Le Tutoriel de Bootstrap Dropdown

5. Input Group avec Select

Lors de l'utilisation de Input Group avec l'élément <select>, l'élément <select> doit être appliqué dans la classe "custom-select", ce qui lui permet de remplir l'espace restant dans le sens horizontal, et d'avoir le même style que celui du Bootstrap.

Exemple Input Group avec Custom Select :

<div class="input-group mb-3">
    <div class="input-group-prepend">
        <label class="input-group-text" for="inputGroupSelect01">Options</label>
    </div>
    <select class="custom-select" id="inputGroupSelect01">
        <option selected>Choose...</option>
        <option value="1">One</option>
        <option value="2">Two</option>
        <option value="3">Three</option>
    </select>
</div>


<div class="input-group">
    <select class="custom-select">
        <option selected>Choose...</option>
        <option value="1">One</option>
        <option value="2">Two</option>
        <option value="3">Three</option>
    </select>
    <div class="input-group-append">
        <button class="btn btn-outline-success" type="button">Button</button>
    </div>
</div>

6. Input Group avec Custom File

Exemple : Utilisez Input Group avec l'élément personnalisé <input type="file"> :

<div class="input-group mb-3">
    <div class="input-group-prepend">
        <span class="input-group-text">Upload</span>
    </div>
    <div class="custom-file">
        <input type="file" class="custom-file-input" id="inputGroupFile01">
        <label class="custom-file-label" for="inputGroupFile01">Choose file</label>
    </div>
</div>

<div class="input-group mb-3">
    <div class="custom-file">
        <input type="file" class="custom-file-input" id="inputGroupFile02">
        <label class="custom-file-label" for="inputGroupFile02">Choose file</label>
    </div>
    <div class="input-group-append">
        <span class="input-group-text" id="">Upload</span>
    </div>
</div>

<div class="input-group mb-3">
    <div class="input-group-prepend">
        <button class="btn btn-outline-secondary" type="button">Button</button>
    </div>
    <div class="custom-file">
        <input type="file" class="custom-file-input" id="inputGroupFile03">
        <label class="custom-file-label" for="inputGroupFile03">Choose file</label>
    </div>
</div>

<div class="input-group">
    <div class="custom-file">
        <input type="file" class="custom-file-input" id="inputGroupFile04">
        <label class="custom-file-label" for="inputGroupFile04">Choose file</label>
    </div>
    <div class="input-group-append">
        <button class="btn btn-outline-secondary" type="button">Button</button>
    </div>
</div>

7. La taille de Input Group

En ajoutant les classes liées à la "Taille" (Sizing) à l'élément .input-group, il agira sur tous les éléments enfant. Vous n'avez pas besoin de configurer le dimensionnement pour chacun d'entre eux.

Liste des classes utilisées pour établir le "Taille" du Input Group :

input-group-sm
input-group-lg

<div class="input-group input-group-sm mb-3">
    <div class="input-group-prepend">
        <span class="input-group-text">Small</span>
    </div>
    <input type="text" class="form-control">
</div>

<div class="input-group mb-3">
    <div class="input-group-prepend">
        <span class="input-group-text">Default</span>
    </div>
    <input type="text" class="form-control">
</div>

<div class="input-group input-group-lg">
    <div class="input-group-prepend">
        <span class="input-group-text">Large</span>
    </div>
    <input type="text" class="form-control">
</div>