What is the best way to ensure a dropdown in an input group occupies the full width?

One of the challenges I'm facing involves a row with 2 columns - the first column contains a title and the second column features an input group.

Within the input group, there is an icon and a dropdown menu. Unfortunately, the dropdown menu is not occupying the entire width available, unlike a select option would.

Check out the code snippet on jsfiddle: https://jsfiddle.net/326qay2p/1/

Here's the relevant code snippet:

<div class="container-fluid limited">
  <div class="row">
    <div class="col-md-8 col-xl-9 col-sm-12 d-flex align-items-center bg-info">
      <h4 class="font-weight-bold d-inline mb-0"></h4>
      <small class="text-muted ml-1">(0)</small>
    </div>
    <div class="col-md-4 col-xl-3 col-sm-12 bg-danger">
      <div class="input-group">
        <div class="input-group-prepend">
          <span class="input-group-text" id="basic-addon1"><i class="fas fa-sort-amount-down"></i></span>
        </div>
        <div class="dropdown">
          <button class="btn dropdown-toggle" href="#" type="button" id="dropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
            Dropdown link
          </button>
          <div class="dropdown-menu" aria-labelledby="dropdownMenuLink">
            <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>
        </div>
      </div>
    </div>
  </div>
</div>

Aiming to resolve the issue, my main goal is to make sure that the input group with the dropdown menu takes up the entire width within the column. Despite experimenting with the width setting, it tends to create undesired results..

Answer №1

If you want the dropdown to fill the entire width of its parent without resorting to custom CSS, here's how you can achieve it.

Firstly, ensure you are using Bootstrap 4.1.1 or later. Then, apply the flex-grow-1 class to the dropdown element and the w-100 class to the dropdown-toggle element.

By default, the text will be centered. To align it to the left or right, add text-left or text-right after the w-100 class. For more details, refer to this resource.

Step 1

<div class="dropdown flex-grow-1">

Step 2

<button class="btn dropdown-toggle w-100 text-left" href="#" type="button" id="dropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">

<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet"/>
<link href="https://use.fontawesome.com/releases/v5.0.12/css/all.css" rel="stylesheet"/>
<div class="container-fluid limited">
  <div class="row">
    <div class="col-md-8 col-xl-9 col-sm-12 d-flex align-items-center bg-info">
      <h4 class="font-weight-bold d-inline mb-0"></h4>
      <small class="text-muted ml-1">(0)</small>
    </div>
    <div class="col-md-4 col-xl-3 col-sm-12 bg-danger">
      <div class="input-group">
        <div class="input-group-prepend">
          <span class="input-group-text" id="basic-addon1"><i class="fas fa-sort-amount-down"></i></span>
        </div>
        <div class="dropdown flex-grow-1">
          <button class="btn dropdown-toggle w-100 text-left" href="#" type="button" id="dropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
            Dropdown link
          </button>
          <div class="dropdown-menu" aria-labelledby="dropdownMenuLink">
            <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>
        </div>
      </div>
    </div>
  </div>
</div>

View the full-width-dropdown example on Codepen

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