Bootstrap Input Group Tutorial

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1- Input Group

See also the way to use  Form and  Input Controls in  Bootstrap:
Input Group means the way helping you to extend an  Input Control by adding the elements such as  Text, Button, hoặc Button Group,..next to it . The elements added next to the   Input Control are referred to as  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>
 
You can put many  Input Controls or many   Addons in an  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>
Note: The  aria-label, aria-describedby attributes may be used if you want your application to support the equipment such as   Screen Reader the best (screen reader for the blind).
<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

For example, Input Group with  Addon which is  checkbox or  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 with Buttons

Add one or more  Button to  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 with Dropdown

Add  Dropdown to an  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>
See also:

5- Input Group with Select

When using an  Input Group with the  <select> element, the  <select> element should be applied the  "custom-select" class, which makes it fill the remaining space in the horizontal direction, and having style as the same as that of  Bootstrap.
Example: Input Group with  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 with Custom File

Example: use  Input Group with the <input type="file"> custom element:
<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- Input Group Sizing

By adding the classes related to the "Sizing" to the  .input-group element, it will act any child elements. You don't need to set up sizing for all of them.
List of classes used for establishing the "Sizing" for  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>

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