Bootstrap4 Input Group
We can use.input-groupclass to add more styles to form input boxes, such as icons, text, or buttons.
Use.input-group-prependclass to add text information in front of the input box,.input-group-appendclass is added after the input box.
Finally, we also need to use.input-group-textclass to set the style of the text.
Bootstrap4 Example
<form>
<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="Your Email">
<div class="input-group-append">
<span class="input-group-text">@example.com</span>
</div>
</div>
</form>
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Input Box Size
Use.input-group-smclass to set a small input box,.input-group-lgclass sets a large input box:
Bootstrap4 Example
<form>
<div class="input-group mb-3 input-group-sm">
<div class="input-group-prepend">
<span class="input-group-text">Small</span>
</div>
<input type="text" class="form-control">
</div>
</form>
<form>
<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>
</form>
<form>
<div class="input-group mb-3 input-group-lg">
<div class="input-group-prepend">
<span class="input-group-text">Large</span>
</div>
<input type="text" class="form-control">
</div>
</form>
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Multiple Input Boxes and Text
Bootstrap4 Example
<!--Multiple Input Boxes-->
<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 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>
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Checkboxes and Radio Buttons
The text can be replaced with checkboxes and radio buttons:
Bootstrap4 Example
<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="EXAMPLE">
</div>
<div class="input-group mb-3">
<div class="input-group-prepend">
<div class="input-group-text">
<input type="radio">
</div>
</div>
<input type="text" class="form-control" placeholder="GOOGLE">
</div>
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Add Button Group to Input Box
Bootstrap4 Example
<div class="input-group mb-3">
<div class="input-group-prepend">
<button class="btn btn-outline-secondary" 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>
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Dropdown Menu
Adding a dropdown menu to the input box does not require using the .dropdown class.
Bootstrap4 Example
<div class="input-group mt-3 mb-3">
<div class="input-group-prepend">
<button type="button" class="btn btn-outline-secondary dropdown-toggle" data-toggle="dropdown">Select Website</button>
<div class="dropdown-menu">
<a class="dropdown-item" href="https://www.google.com">GOOGLE</a>
<a class="dropdown-item" href="https://www.example.com">EXAMPLE</a>
<a class="dropdown-item" href="https://www.taobao.com">TAOBAO</a>
</div>
</div>
<input type="text" class="form-control" placeholder="Website Address">
</div>
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Input Group Label
In input groups, set labels by placing a label element outside the input group. The for attribute of the label must correspond to the id of the input group. Clicking the label can focus the input box:
Bootstrap4 Example
<label for="demo">Write your email here:</label>
<div class="input-group mb-3">
<input type="text" class="form-control" placeholder="Email" id="demo" name="email">
<div class="input-group-append">
<span class="input-group-text">@example.com</span>
</div>
</div>
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