Angular2 Multiselect Dropdown

Angular 2 multiselect dropdown component for web applications. Easy to integrate and use.

Important Notice !!

From v3.0.0 onwards, you need to include `default.theme.css` file to get the basic styling of the dropdown. Refer to `themes and theming` section below

Documentation | Demos / Examples.

1. Getting Started

2. Installation

3. Usage

4 Theming

5. Templates

6. Template Driven Forms support

7. Reactive Forms support

8. Settings configuration

9. Callbacks and events

10. Lazy lodaing - handle large data lists

11. Group By feature

12. Search filter for both plain list and grouped list

13. Custom Search / Search API

Getting Started

Installation

The Mutiselect Dropdown package is published on the npm Registry.
Install the package : npm install angular2-multiselect-dropdown
Once installed import AngularMultiSelectModule from the installed package into your module as follows:

Usage

Import AngularMultiSelectModule into NgModule in app.module.ts. Angular's FormsModule is also required.

import { AngularMultiSelectModule } from 'angular2-multiselect-dropdown/angular2-multiselect-dropdown';
import { FormsModule } from '@angular/forms';

@NgModule({
  // ...
  imports: [
    AngularMultiSelectModule,
    FormsModule
  ]
  // ...
})

Declare the component data variables and options in your component where you want to consume the dropdown component.

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

export class AppComponent implements OnInit {
    dropdownList = [];
    selectedItems = [];
    dropdownSettings = {};
    ngOnInit(){
        this.dropdownList = [
                              {"id":1,"itemName":"India"},
                              {"id":2,"itemName":"Singapore"},
                              {"id":3,"itemName":"Australia"},
                              {"id":4,"itemName":"Canada"},
                              {"id":5,"itemName":"South Korea"},
                              {"id":6,"itemName":"Germany"},
                              {"id":7,"itemName":"France"},
                              {"id":8,"itemName":"Russia"},
                              {"id":9,"itemName":"Italy"},
                              {"id":10,"itemName":"Sweden"}
                            ];
        this.selectedItems = [
                                {"id":2,"itemName":"Singapore"},
                                {"id":3,"itemName":"Australia"},
                                {"id":4,"itemName":"Canada"},
                                {"id":5,"itemName":"South Korea"}
                            ];
        this.dropdownSettings = { 
                                  singleSelection: false, 
                                  text:"Select Countries",
                                  selectAllText:'Select All',
                                  unSelectAllText:'UnSelect All',
                                  enableSearchFilter: true,
                                  classes:"myclass custom-class"
                                };            
    }
    onItemSelect(item:any){
        console.log(item);
        console.log(this.selectedItems);
    }
    OnItemDeSelect(item:any){
        console.log(item);
        console.log(this.selectedItems);
    }
    onSelectAll(items: any){
        console.log(items);
    }
    onDeSelectAll(items: any){
        console.log(items);
    }
}

Add the following component tag in you template

<angular2-multiselect [data]="dropdownList" [(ngModel)]="selectedItems" 
    [settings]="dropdownSettings" 
    (onSelect)="onItemSelect($event)" 
    (onDeSelect)="OnItemDeSelect($event)"
    (onSelectAll)="onSelectAll($event)"
    (onDeSelectAll)="onDeSelectAll($event)"></angular2-multiselect>

Themes and Theming

From v3.0.0 onwards, you need to include default.theme.css file to get the basic styling of the dropdown.
The component package has a themes folder in node_modules at angular2-multiselect-dropdown\themes\default.theme.css
Include the default.theme.css in angular-cli.json (for versions below angular 6) and angular.json (for version 6 or more).
Refer this file on how to add the css file to your angular project.

You can create your own theme from now on. You can have a look at example scss theming file at Default theme

Template - For custom html of menu item

<angular2-multiselect [data]="dropdownList" [(ngModel)]="selectedItems" [settings]="dropdownSettings">
  <c-item>
          <ng-template let-item="item">
            <label style="color: #333;min-width: 150px;">{{item.itemName}}</label>
            <img [src]="item.image" style="width: 30px; border: 1px solid #efefef;margin-right: 20px;" />
            <label>Capital - {{item.capital}}</label>
          </ng-template>
  </c-item>    
</angular2-multiselect>

Template - For custom html of Selected item - badge

<angular2-multiselect [data]="dropdownList" [(ngModel)]="selectedItems" [settings]="dropdownSettings">
  <c-badge>
           <ng-template let-item="item">
            <label style="margin: 0px;">{{item.itemName}}</label>
            <img [src]="item.image" style="width: 16px; margin-right: 5px;" />
           </ng-template>
  </c-badge>  
</angular2-multiselect>

Template Driven Forms support

<form (ngSubmit)="onSubmit()" #loginForm="ngForm" style="border: 1px solid #ccc; padding: 10px;">
        <div class="form-group">
            <label for="name">Skills</label>
            <angular2-multiselect [data]="itemList" [(ngModel)]="formModel.skills" 
                                  [settings]="settings" 
                                  (onSelect)="onItemSelect($event)"
                                  (onDeSelect)="OnItemDeSelect($event)" 
                                  (onSelectAll)="onSelectAll($event)" 
                                  (onDeSelectAll)="onDeSelectAll($event)" name="skills">
            </angular2-multiselect>
        </div>
</form>

formModel = {
        name: '',
        email: '[email protected]',
        skills: [{ "id": 1, "itemName": "Angular" }]
    };

Reactive Forms support

<form [formGroup]="userForm" novalidate style="border: 1px solid #ccc; padding: 10px;">
        <div class="form-group">
            <label for="name">Skills</label>
           <angular2-multiselect [data]="itemList" [(ngModel)]="selectedItems" 
                                  [settings]="settings" 
                                  (onSelect)="onItemSelect($event)"
                                  (onDeSelect)="OnItemDeSelect($event)" 
                                  (onSelectAll)="onSelectAll($event)" 
                                  (onDeSelectAll)="onDeSelectAll($event)" formControlName="skills">
            </angular2-multiselect>
        </div>
</form>

userForm: FormGroup;
this.userForm = this.fb.group({
            name: '',
            email: ['', Validators.required],
            skills: [[], Validators.required]
        });

Settings

The following list of settings are supported by the component. Configure the settings to meet your requirement.

Setting	Type	Description	Default Value
singleSelection	Boolean	To set the dropdown for single item selection only.	false
text	String	Text to be show in the dropdown, when no items are selected.	'Select'
enableCheckAll	Boolean	Enable the option to select all items in list	false
selectAllText	String	Text to display as the label of select all option	Select All
unSelectAllText	String	Text to display as the label of unSelect option	UnSelect All
enableSearchFilter	Boolean	Enable filter option for the list.	false
enableFilterSelectAll	Boolean	A 'select all' checkbox to select all filtered results.	true
filterSelectAllText	String	Text to display as the label of select all option	Select all filtered results
filterUnSelectAllText	String	Text to display as the label of unSelect option	UnSelect all filtered results
maxHeight	Number	Set maximum height of the dropdown list in px.	300
badgeShowLimit	Number	Limit the number of badges/items to show in the input field. If not set will show all selected.	All
classes	String	Custom classes to the dropdown component. Classes are added to the dropdown selector tag. To add multiple classes, the value should be space separated class names.	''
limitSelection	Number	Limit the selection of number of items from the dropdown list. Once the limit is reached, all unselected items gets disabled.	none
disabled	Boolean	Disable the dropdown	false
searchPlaceholderText	String	Custom text for the search placeholder text. Default value would be 'Search'	'Search'
groupBy	String	Name of the field by which the list should be grouped.	none
searchAutofocus	Boolean	Autofocus search input field	true
labelKey	String	The property name which should be rendered as label in the dropdown	itemName
primaryKey	String	The property by which the object is identified. Default is 'id'.	id
position	String	Set the position of the dropdown list to 'top' or 'bottom'	bottom
noDataLabel	String	Label text when no data is available in the list	'No Data Available'
searchBy	Array	Search the list by certain properties of the list item. Ex: ["itemName, "id","name"]. Deafult is , it will search the list by all the properties of list item	[]
lazyLoading	Boolean	Enable lazy loading. Used to render large datasets.	false
showCheckbox	Boolean	Show or hide checkboxes in the list	true

Events

onSelect - Return the selected item on selection. Example : (onSelect)="onItemSelect($event)"
onDeSelect - Return the un-selected item on un-selecting. Example : (onDeSelect)="OnItemDeSelect($event)"
onSelectAll - Return the list of all selected items. Example : (onSelectAll)="onSelectAll($event)"
onDeSelectAll - Returns an empty array. Example : (onDeSelectAll)="onDeSelectAll($event)"
onOpen - Callback method fired after the dropdown opens Example : (onOpen)="onOpen($event)"
onClose - Callback method, fired when the dropdown is closed Example : (onClose)="onClose($event)"

Run locally

Clone the repository or downlod the .zip,.tar files.
Run npm install
Run ng serve for a dev server
Navigate to http://localhost:4200/ The app will automatically reload if you change any of the source files.

License

MIT License.

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