Tips for implementing Bootstrap dropdown functionality in an Angular2 project

Question

Tips for implementing Bootstrap dropdown functionality in an Angular2 project

For my latest project, I wanted to incorporate dropdown menus. I found a code snippet on a website and implemented it. However, although the dropdown menu appeared as expected, I encountered an issue where clicking on it did not trigger any actions.

   
<li class="dropdown">
    <a [routerLink]="['/frontendai']" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Application Insights <span class="caret"></span></a>
    <ul class="dropdown-menu" role="menu">
        <li><a [routerLink]="['/frontendai']">FrontEnd AI</a></li>
        <li class="divider"></li>
        <li><a [routerLink]="['/apiai']">API AI</a></li>
        <li class="divider"></li>
        <li><a [routerLink]="['/apiai']">SQL Exception</a></li>
    </ul>
</li>

Using Bootstrap version 3.3.7, I made changes to my index.cshtml by adding the following lines:

<link href="node_modules/bootstrap/dist/css/bootstrap.css" rel="stylesheet" />
<link href="node_modules/bootstrap/dist/css/bootstrap.min.css" rel="stylesheet" />
<script src="~/node_modules/bootstrap/dist/js/bootstrap.min.js"></script>

Any tips on effectively utilizing Bootstrap dropdowns in an Angular 2 project?

angular typescript dropdown bootstrapping

Answer 1

Answer №1

Check out ngx-bootstrap for your Angular Project, compatible with version 2 and above.

For more information, visit this link:

You can easily incorporate it into your project.

Follow these instructions:

1. Run the command: npm install ngx-bootstrap --save

2. Import Dropdown Module

// RECOMMENDED (may not work with system.js)
import { BsDropdownModule } from 'ngx-bootstrap/dropdown';
// or
import { BsDropdownModule } from 'ngx-bootstrap';

@NgModule({
  imports: [BsDropdownModule.forRoot(),...]
})
export class AppModule{}

<div class="btn-group" dropdown>
  <button dropdownToggle type="button" class="btn btn-primary dropdown-toggle>
    Button dropdown <span class="caret"></span>
  </button>
  <ul *dropdownMenu class="dropdown-menu" role="menu>
    <li role="menuitem><a class="dropdown-item" href="#">Action</a></li>
    <li role="menuitem><a class="dropdown-item" href="#">Another action</a></li>
    <li role="menuitem><a class="dropdown-item" href="#">Something else here</a></li>
    <li class="divider dropdown-divider></li>
    <li role="menuitem><a class="dropdown-item" href="#">Separated link</a>
    </li>
  </ul>
</div>

Answer 2

Check out ngx-bootstrap for your Angular Project, compatible with version 2 and above.

For more information, visit this link:

You can easily incorporate it into your project.

Follow these instructions:

1. Run the command: npm install ngx-bootstrap --save

2. Import Dropdown Module

// RECOMMENDED (may not work with system.js)
import { BsDropdownModule } from 'ngx-bootstrap/dropdown';
// or
import { BsDropdownModule } from 'ngx-bootstrap';

@NgModule({
  imports: [BsDropdownModule.forRoot(),...]
})
export class AppModule{}

<div class="btn-group" dropdown>
  <button dropdownToggle type="button" class="btn btn-primary dropdown-toggle>
    Button dropdown <span class="caret"></span>
  </button>
  <ul *dropdownMenu class="dropdown-menu" role="menu>
    <li role="menuitem><a class="dropdown-item" href="#">Action</a></li>
    <li role="menuitem><a class="dropdown-item" href="#">Another action</a></li>
    <li role="menuitem><a class="dropdown-item" href="#">Something else here</a></li>
    <li class="divider dropdown-divider></li>
    <li role="menuitem><a class="dropdown-item" href="#">Separated link</a>
    </li>
  </ul>
</div>

Answer 3

Answer №2

If you want to implement a bootstrap dropdown in Angular, you will need to include two classes. One is the show class on the parent dropdown element (dropdown), and the other is the show class on its child dropdown-menu.

To achieve this, you can either create a dropdown component and pass a list of values as an array along with their click handlers, or you can create a custom directive.

Here is an example of the Custom Dropdown directive approach:

import { Directive, ElementRef, HostListener } from '@angular/core';

@Directive({
  selector: '[appDropdown]'
})
export class DropdownDirective {

  constructor(private el: ElementRef) { }

  //Binding click to Add show class 
  @HostListener('click') onclick() {

    var parent = this.el.nativeElement;//parent element
    parent.classList.toggle('show');
    var child = [].filter.call(this.el.nativeElement.children, function(ele) {
      return ele.classList.contains('dropdown-menu');
    }); //Identify the child element on dropdown clicked- dropdwon menu

    if(child.length) {
      child[0].classList.toggle('show');
    }
  }

}

Now, in the template, you can attach this custom directive to the bootstrap dropdown as follows:

<li class="nav-item dropdown" appDropdown>
   <a class="nav-link dropdown-toggle"  id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false>
     Username
   </a>
   <div class="dropdown-menu" aria-labelledby="navbarDropdown">
      <a class="dropdown-item" >Profile 2</a>
      <a class="dropdown-item" >Logout 2</a>
   </div>
 </li>

NOTE - This solution is specifically for Bootstrap 4 Dropdown. For Bootstrap 3, you will need to identify the appropriate classes to attach, such as the open class at the parent level only.

Answer 4

If you want to implement a bootstrap dropdown in Angular, you will need to include two classes. One is the show class on the parent dropdown element (dropdown), and the other is the show class on its child dropdown-menu.

To achieve this, you can either create a dropdown component and pass a list of values as an array along with their click handlers, or you can create a custom directive.

Here is an example of the Custom Dropdown directive approach:

import { Directive, ElementRef, HostListener } from '@angular/core';

@Directive({
  selector: '[appDropdown]'
})
export class DropdownDirective {

  constructor(private el: ElementRef) { }

  //Binding click to Add show class 
  @HostListener('click') onclick() {

    var parent = this.el.nativeElement;//parent element
    parent.classList.toggle('show');
    var child = [].filter.call(this.el.nativeElement.children, function(ele) {
      return ele.classList.contains('dropdown-menu');
    }); //Identify the child element on dropdown clicked- dropdwon menu

    if(child.length) {
      child[0].classList.toggle('show');
    }
  }

}

Now, in the template, you can attach this custom directive to the bootstrap dropdown as follows:

<li class="nav-item dropdown" appDropdown>
   <a class="nav-link dropdown-toggle"  id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false>
     Username
   </a>
   <div class="dropdown-menu" aria-labelledby="navbarDropdown">
      <a class="dropdown-item" >Profile 2</a>
      <a class="dropdown-item" >Logout 2</a>
   </div>
 </li>

NOTE - This solution is specifically for Bootstrap 4 Dropdown. For Bootstrap 3, you will need to identify the appropriate classes to attach, such as the open class at the parent level only.

Tips for implementing Bootstrap dropdown functionality in an Angular2 project

Answer №1

Answer №2

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