Angular Bootstrap dropdown

The dropdown is simply a drop-down menu embedding additional links or content. It allows you to construct much more advanced navigation and link categorization.

In case of more complicated navigations systems dropdowns are the essential elements providing you with possibility of placing all the most relevant links in our navigation bar (or other component acting as navigation - such as SideNav)

Aside from being not only highly functional, MDB dropdowns are also extraordinary visually attractive. It gives them this characteristic Material Design effects, like shadows, living colors or charming waves effect after opening a link.

They’re toggled by clicking, not by hovering; this is an intentional design decision. Why?

MDB is "mobile first" framework so, we avoid mixing functional elements and interaction by hovering because it decreases User Experience of users of mobile devices.

Google Material Design guidelines recommend the same approach.

Basic example

Add dropdown attribute to the parent div. If selected options need to be highlighted with color, then add class .dropdown instead of .btn-group.

Inside button element add attribute dropdownToggle. Then, add the menu’s HTML.


<div class="btn-group" dropdown>
    <button dropdownToggle type="button" class="btn btn-primary dropdown-toggle waves-light" mdbWavesEffect>
        Basic dropdown
    </button>

    <div class="dropdown-menu dropdown-primary">
        <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 class="divider dropdown-divider"></div>
        <a class="dropdown-item" href="#">Separated link</a>
    </div>
</div>

Material dropdowns MDB Pro component


<!--Dropdown primary-->
<div class="dropdown" dropdown>

    <!--Trigger-->
    <button dropdownToggle class="btn btn-primary dropdown-toggle waves-light" type="button" mdbWavesEffect>
        Dropdown primary
    </button>

    <!--Menu-->
    <div class="dropdown-menu dropdown-primary">
        <a class="dropdown-item" href="#">Action</a>
        <a class="dropdown-item" href="#">Another action</a>
        <a class="dropdown-item" href="#">Something else here</a>
        <a class="dropdown-item" href="#">Something else here</a>
    </div>
</div>
<!--/Dropdown primary-->

To change a color of the dropdown use one of the following classes.

.dropdown-primary
.dropdown-default
.dropdown-secondary
.dropdown-success
.dropdown-elegant
.dropdown-danger
.dropdown-info
.dropdown-warning
.dropdown-ins

Split button dropdowns


<!-- Split button -->
<div class="btn-group" dropdown>
    <button type="button" class="btn btn-danger waves-light" mdbWavesEffect>Action</button>
    <button type="button" dropdownToggle class="btn btn-danger dropdown-toggle dropdown-toggle-split px-3 waves-light" mdbWavesEffect></button>
    <div class="dropdown-menu">
        <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 class="dropdown-divider"></div>
        <a class="dropdown-item" href="#">Separated link</a>
    </div>
</div>

Sizing

Button dropdowns work with buttons of all sizes.


<!-- Large button group -->                                
<div class="btn-group" dropdown>
    <button dropdownToggle class="btn btn-danger btn-lg dropdown-toggle waves-light" type="button" mdbWavesEffect> 
        Large button
    </button>
    <div class="dropdown-menu">
        <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 class="dropdown-divider"></div>
        <a class="dropdown-item" href="#">Separated link</a>
    </div>
</div>

<!-- Small button group -->
<div class="btn-group" dropdown>
    <button dropdownToggle class="btn btn-danger btn-sm dropdown-toggle waves-light" type="button" mdbWavesEffect>
        Small button
    </button>
    <div class="dropdown-menu">
        <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 class="dropdown-divider"></div>
        <a class="dropdown-item" href="#">Separated link</a>
    </div>
</div>

Dropup variation

Trigger dropdown menus above elements by adding [dropup]="true" to the parent.


<div class="btn-group" dropdown [dropup]="true">
    <button type="button" class="btn btn-primary waves-light" mdbWavesEffect>Dropup</button>
    <button type="button" dropdownToggle class="btn btn-primary dropdown-toggle dropdown-toggle-split px-3 waves-light" mdbWavesEffect></button>
    <div class="dropdown-menu">
        <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 class="dropdown-divider"></div>
        <a class="dropdown-item" href="#">Separated link</a>
    </div>
</div>

Alignment

By default, a dropdown menu is automatically positioned 100% from the top and along the left side of its parent.

Add .dropdown-menu-right to a .dropdown-menu to right align the dropdown menu.


<div class="dropdown" dropdown>
    <button dropdownToggle type="button" class="btn btn-primary dropdown-toggle waves-light" mdbWavesEffect>
        Dropdown
    </button>

    <div class="dropdown-menu dropdown-menu-right">
        <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>

Menu headers

Add a header to label sections of actions in any dropdown menu.


<div class="dropdown" dropdown>
    <button dropdownToggle type="button" class="btn btn-primary dropdown-toggle waves-light" mdbWavesEffect>
        Dropdown
    </button>

    <div class="dropdown-menu">
        <h6 class="dropdown-header">Dropdown header</h6>
        <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>

Menu dividers

Separate groups of related menu items with a divider.


<div class="dropdown" dropdown>
    <button dropdownToggle type="button" class="btn btn-primary dropdown-toggle waves-light" mdbWavesEffect>
        Dropdown
    </button>

    <div class="dropdown-menu">
        <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 class="divider dropdown-divider"></div>
        <a class="dropdown-item" href="#">Separated link</a>
    </div>
</div>

Disabled menu items

Add .disabled to items in the dropdown to style them as disabled.


<div class="dropdown" dropdown>
    <button dropdownToggle type="button" class="btn btn-primary dropdown-toggle waves-light" mdbWavesEffect>
        Dropdown
    </button>

    <div class="dropdown-menu">
        <a class="dropdown-item" href="#">Regular link</a>
        <a class="dropdown-item disabled" href="#">Disabled link</a>
        <a class="dropdown-item" href="#">Another link</a>
    </div>
</div>

API Reference

BsDropdownDirective

Selector	`[bsDropdown],[dropdown]`
Exported as	`bs-dropdown`

Inputs

`[autoClose]`	Type: `boolean` Indicates that dropdown will be closed on item or document click, and after pressing ESC
`[dropup]`	Type: `boolean` This attribute indicates that the dropdown should be opened upwards
`[isDisabled]`	Type: `boolean` Disables dropdown toggle and hides dropdown menu if opened
`[isOpen]`	Type: `boolean` Returns whether or not the popover is currently being shown
`placement`	Type: `string` Placement of a popover. Accepts: "top", "bottom", "left", "right". Also `.dropdown-menu-right` is needed for `.dropdown-menu` `div`
`triggers`	Type: `string` Specifies events that should trigger. Supports a space separated list of event names

Outputs

`(isOpenChange)="isOpenChange()"`	Emits an event when isOpen change
`(onHidden)="onHidden()"`	Emits an event when the popover is hidden
`(onShown)="onShown()"`	Emits an event when the popover is shown

Example:

HTML
TS

<div class="btn-group" dropdown (onShown)="onShown()" (isOpenChange)="isOpenChange()" (onHidden)="onHidden()">
    <button dropdownToggle type="button" class="btn btn-primary dropdown-toggle waves-light" mdbWavesEffect>
        Dropdown
    </button>

    <div class="dropdown-menu dropdown-primary">
        <a class="dropdown-item" href="#">Action</a>
        <a class="dropdown-item disabled" href="#">Another action</a>
        <a class="dropdown-item" href="#">Something else here</a>
        <div class="divider dropdown-divider"></div>
        <a class="dropdown-item" href="#">Separated link</a>
    </div>
</div>

import { Component } from '@angular/core';

@Component({
  selector: 'dropdown-example',
  templateUrl: 'dropdown.html',

})

export class DropdownComponent {

    public isOpenChange(): void { console.log('isOpenChange triggered!'); }

    public onHidden(): void { console.log('onHidden triggered!'); }

    public onShown(): void { console.log('OnShown triggered!'); }

}

Methods

To your dropdown element add #dropdown='bs-dropdown'. And to the trigger add below mentioned options.

`(event)="name.show()"`	Return type: `void` Opens an element’s popover. This is considered a “manual” triggering of the popover
`(event)="name.hide()"`	Return type: `void` Closes an element’s popover. This is considered a “manual” triggering of the popover
`(event)="name.toggle(value: boolean)()"`	Return type: `void` Toggles an element’s popover. This is considered a “manual” triggering of the popover

Example:


<button class="btn btn-primary waves-light" (mouseenter)="dropdown.toggle()">Dropdown toggle</button>

<div class="btn-group" dropdown #dropdown="bs-dropdown">
    <button  type="button" class="btn btn-primary dropdown-toggle waves-light" mdbWavesEffect>
        Dropdown
    </button>

    <div class="dropdown-menu dropdown-primary">
        <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 class="divider dropdown-divider"></div>
        <a class="dropdown-item" href="#">Separated link</a>
    </div>
</div>