<h1><center>Dropdowns</center></h1>

• Drop-downs are basically work's like a toggle button.
• We can create drop-downs by using JavaScript and Bootstrap standard plugins.
• Drop-downs are toggle but we have to click hover effect is not enough.
• Various kind of third parties use popper.js or popper.min.js libraries, they provide dynamic features to our drop-downs
• In Bootstrap we use bootstrap.bundle.min.js or bootstrap.bundle.js libraries

Single Button

Here we are using this drop down in the button element.

<div class="dropdown">
  <button class="btn btn-danger dropdown-toggle" type="button" data-toggle="dropdown" aria-haspopup="false" aria-expanded="false">
   My Single Dropdown
  </button>
  <div class="dropdown-menu" aria-labelledby="dropdownMenuButton">
    <a class="dropdown-item" href="#">let's</a>
    <a class="dropdown-item" href="#">keep</a>
    <a class="dropdown-item" href="#">Coding</a>
  </div>

Single Dropdown with <a> tag.

<div class="dropdown">
  <a class="btn btn-primary dropdown-toggle" href="#" role="button" id="dropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
    Single Dropdown
  </a>
  <div class="dropdown-menu" aria-labelledby="dropdownMenuLink">
    <a class="dropdown-item" href="https://www.codesfamily.com/">let's</a>
    <a class="dropdown-item" href="https://www.codesfamily.com/">keep</a>
    <a class="dropdown-item" href="https://www.codesfamily.com/">Coding</a>
  </div>
</div>

Split Button

In Bootstrap we can also create split button dropdown by using .dropdown-toggle-split class.We can also manage margin and padding according to our requirement.

<div class="btn-group">
  <button type="button" class="btn btn-success">Action</button>
  <button type="button" class="btn btn-danger  dropdown-toggle-split" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
    <span class="sr-only">My Dropdown</span>
  </button>
  <div class="dropdown-menu">
    <a class="dropdown-item" href="#">Let's</a>
    <a class="dropdown-item" href="#">Keep</a>
    <a class="dropdown-item" href="#">Coding</a>
    <div class="dropdown-divider"></div>
    <a class="dropdown-item" href="#">share link</a>
  </div>
</div>

Sizing

In Bootstrap we can customize the size of dropdown according to our requirement by using .drop element.

<div class="btn-group">
  <button class="btn btn-secondary btn-lg" type="button" data-toggle="dropdown" aria-haspopup="false" aria-expanded="false">
    Large Button
  </button>
  <div class="dropdown-menu">
    ...
  </div>
</div>
<div class="btn-group">
  <button class="btn btn-primary btn-lg dropdown-toggle" type="button">
     split button
  </button>
  <button type="button" class="btn btn-sm btn-primary  dropdown-toggle-split" dggle="dropdown" aria-haspopup="true" aria-expanded="false">ata-to
    <span class="sr-only">Toggled Dropdown</span>
  </button>
  <div class="dropdown-menu">
    ...
  </div>
</div>

Direction

We can set the direction of the dropdown as well in bootstrap.

Dropup

To set the dropdown as a dropup we have to use .dropup element.

<div class="btn-group dropup">
  <button type="button" class="btn btn-secondary dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
    Dropup
  </button>
  <div class="dropdown-menu">
    <!-- Dropdown menu links -->
  </div>
</div>
<!-- Split dropup button -->
<div class="btn-group dropup">
  <button type="button" class="btn btn-secondary">
   Split dropup button
  </button>
  <button type="button" class="btn btn-success  dropdown-toggle-split" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
    <span class="sr-only">Toggle Dropdown</span>
  </button>
  <div class="dropdown-menu">
    <!-- Dropdown menu links -->
  </div>
</div>

Dropright

To set the dropdown as a Dropright we have to use .dropright element.

<div class="btn-group dropright">
  <button type="button" class="btn btn-danger dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
    Dropright
  </button>
  <div class="dropdown-menu">
    <!-- Dropdown menu links -->
  </div>
</div>
<!-- Split dropright button -->
<div class="btn-group dropright">
  <button type="button" class="btn btn-danger">
    Split dropright
  </button>
  <button type="button" class="btn btn-danger  dropdown-toggle-split" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
    <span class="sr-only">Toggle Dropright</span>
  </button>
  <div class="dropdown-menu">
    <!-- Dropdown menu links -->
  </div>
</div>

Dropleft

To set the dropdown direction as a Dropleft we have to use .dropleft element.

<div class="btn-group dropleft">
  <button type="button" class="btn btn-primary dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
    Dropleft Dropdown
  </button>
  <div class="dropdown-menu">
    <!-- Dropdown menu links -->
  </div>
</div>
<!-- Split dropleft button -->
<div class="btn-group">
  <div class="btn-group dropleft" role="group">
    <button type="button" class="btn btn-primary dropdown-toggle dropdown-toggle-split" data-toggle="dropdown" aria-haspopup="false" aria-expanded="false">
      <span class="sr-only">Toggle Dropleft Dropdown</span>
    </button>
    <div class="dropdown-menu">
      <!-- Dropdown menu links -->
    </div>
  </div>
  <button type="button" class="btn btn-primary">
    Split dropleft dropdown
  </button>
</div>

Menu Items In Dropdown

In Bootstrap we initially we used only tag inside the dropdowns but now we can also use button element inside the dropdown.

<div class="dropdown ">
  <button class="btn btn-danger dropdown-toggle" type="button" data-toggle="dropdown" aria-haspopup="false" aria-expanded="false">
    Dropdown
  </button>
  <div class="dropdown-menu" aria-labelledby="dropdownMenu2">
    <button class="dropdown-item" type="button">Let's</button>
    <button class="dropdown-item" type="button">Keep</button>
    <button class="dropdown-item" type="button">Coding</button>
  </div>
</div>

Active

In Bootstrap we can also add styles by using .active element in dropdowns.

<div class="dropdown-menu">
  <a class="dropdown-item" href="#">Java</a>
  <a class="dropdown-item active" href="#">Python</a>
  <a class="dropdown-item" href="#">C++</a>
</div>

Disable

In Bootstrap , If we don't want to use styles in the dropdown so we can disable as well by using .disable element in dropdown.

<div class="dropdown-menu">
  <a class="dropdown-item" href="#">Common link</a>
  <a class="dropdown-item disabled" href="#" tabindex="-1" aria-disabled="true">Disabled link Dropdown </a>
  <a class="dropdown-item" href="#">Next link</a>
</div>

Menu Alignment

In bootstrap , dropdowns are automatically positioned by default 100%.
We can set custom alignment as well according to our requirement, by using dropdown-menu-right

<div class="btn-group">
  <button type="button" class="btn btn-secondary dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
    Right-aligned menu
  </button>
  <div class="dropdown-menu dropdown-menu-right">
    <button class="dropdown-item" type="button">java</button>
    <button class="dropdown-item" type="button">Python</button>
    <button class="dropdown-item" type="button">C++</button>
  </div>
</div>

Dividers In Bootstrap

In Bootstrap, if we seprate the group of multiple menus known as dividers.

<div class="dropdown-menu">
  <a class="dropdown-item" href="#">Java</a>
  <a class="dropdown-item" href="#">Python</a>
  <a class="dropdown-item" href="#">C++</a>
  <div class="dropdown-divider"></div>
</div>

Text

We can also add custom text in the dropdown menu according to our requirement and we can set custom height and width as well.

<div class="dropdown-menu p-4 text-muted" style="max-width: 200px;">
  <p>
    Codes Family.
  </p>
  <p class="mb-0">
    Is just like your family
  </p>
</div>

Forms

In the bootstrap we can also set form elements inside the dropdown menu according to our requirement.

<div class="dropdown-menu">
  <form class="px-4 py-3">
    <div class="form-group">
      <label for="UserName">UserName</label>
      <input type="text" class="form-control" id="user" placeholder="Enter your name.">
    </div>
    <div class="form-group">
      <label for="exampleDropdownFormEmail1">Email</label>
      <input type="email" class="form-control" id="MyEmail1" placeholder="Enter your Email">
    </div>
    <div class="form-group">
      <label for="exampleDropdownFormPassword1">Password</label>
      <input type="password" class="form-control" id="MyPassword" placeholder="Enter yourPassword">
    </div>
    <button type="submit" class="btn btn-secondary">Sign in</button>
  </form>
  <div class="dropdown-divider"></div>
  <a class="dropdown-item" href="#">If you are new here please? Sign up</a>
  <a class="dropdown-item" href="#">If you Forgot password??</a>
</div>