Custom Dropdown for Angular 4+ with multiple and single selection options

ngx-select-dropdown

ngx-select-dropdown Custom Dropdown component for Angular 4+ with multiple and single selection options

Features

single select dropdown
multi select dropdown
search dropdown list
arrows keys support
limit number of items displayed in dropdown
custom sort
angular forms support
angular v4 and above supported
cross browser support

Examples

demo-page

Installation

npm install ngx-select-dropdown

Using with webpack and tsc builds/ angular-cli builds

import SelectDropDownModule into your app.module;

import { SelectDropDownModule } from 'ngx-select-dropdown'

add SelectDropDownModule to the imports of your NgModule:

@NgModule({
  imports: [
    ...,
    SelectDropDownModule
  ],
  ...
})
class YourModule { ... }

include css styles in you angular-cli.json for versions earlier than 1.4.0

 "styles": [
        "../node_modules/ngx-select-dropdown/dist/assets/style.css"
      ],

use <ngx-select-dropdown></ngx-select-dropdown> in your templates to add the custom dropdown in your view like below

<ngx-select-dropdown (change)="selectionChanged($event)" [multiple]="true" [(ngModel)]="dataModel" [config]="config" [options]="dropdownOptions"></ngx-select-dropdown>

use with reactive form like

<ngx-select-dropdown (change)="selectionChanged($event)" formControlName="selectData" [multiple]="true" [config]="config" [options]="dropdownOptions"></ngx-select-dropdown>

Config

Input

multiple: boolean - true/false beased if multiple selection required or not Defaults to false.
options: Array - Array of string/objects that are to be the dropdown options.
disabled: boolean - disabled attribute to disable the dropdown when required.
config: Object - configuration object.

config = {
        displayKey:"description", //if objects array passed which key to be displayed defaults to description
        search:true //true/false for the search functionlity defaults to false,
        height: 'auto' //height of the list so that if there are more no of items it can show a scroll defaults to auto. With auto height scroll will never appear
        placeholder:'Select' // text to be displayed when no item is selected defaults to Select,
        customComparator: ()=>{} // a custom function using which user wants to sort the items. default is undefined and Array.sort() will be used in that case,
        limitTo: options.length // a number thats limits the no of options displayed in the UI similar to angular's limitTo pipe
        moreText: 'more' // text to be displayed whenmore than one items are selected like Option 1 + 5 more
        noResultsFound: 'No results found!' // text to be displayed when no items are found while searching
        searchPlaceholder:'Search' // label thats displayed in search input,
        searchOnKey: 'name' // key on which search should be performed this will be selective search. if undefined this will be extensive search on all keys
        clearOnSelection: false // clears search criteria when an option is selected if set to true, default is false
        inputDirection: 'ltr' // the direction of the search input can be rtl or ltr(default)
      }

Output

change: Event - change event when user changes the selected options
open: Event - open event when the dropdown toogles on
close: Event - close event when the dropdown toogles off
searchChange: Event - search change event when the search text changes

Change detection

As of now ngx-select-dropdown uses Default change detection startegy which means dirty checking checks for immutable data types. And in Javascript Objects and arrays are mutable. So when changing any of the @Input parameters if you mutate an object change detection will not detect it. For ex:-

this.options.push({id: 34, description: 'Adding new item'});

// or

config.height = '200px';

Both the above scenarios will not trigger the change detection. In order for the componet to detect the changes what you need to do is:-

this.options = [...this.options, {id: 34, description: 'Adding new item'}];

// or

config = {...config, height:'200px'};

Changelog

v0.1.0

 Added a change event so that user can attach a change event handler.
 If multiselect the selected text will display first item and + count for eg. (Option 1 + 2 more) .

v0.2.0

 Angular 4 and above support.
 Bug with search functionality fixed.

v0.3.0

 Support for Observable data source for options and async pipe.
 IE bug with styling.
 Few other minor bug fixes.

v0.4.0

 Use arrows keys and enter to select items from available options.
 Case insensitive search.
 Few other minor bug fixes.

v0.5.0

 Support for scroll bar with too many list items.
 Few other minor bug fixes.

v0.7.0

 Support for limito pipe to limit number of options displayed in case of too many options.
 Support for customComparator / custom sort function
 Few other minor bug fixes.

v0.7.2

 Support for angular 6
 Removed dependency on rxjs

v0.8.0

 No Results found indicator with custom text passed with config
 Custom text for *more* when more than 1 items selected
 Open event emitted
 Close event emitted
 Search placeholder text

v1.0.0

 Search on a specified key value.
 Support for Reactive forms
 Few other minor imoprovements and fixes

v1.2.0

 Search text change event searchChange

v1.3.0

 Clear search on selection config
 Disable with reactive forms .disable()

Help Improve

Found a bug or an issue with this? Open a new issue here on GitHub.

Contributing to this project

Anyone and everyone is welcome to contribute. Please take a moment to review the guidelines for contributing.

Download Details:

Author: manishjanky

Live Demo: https://manishjanky.github.io/ngx-select-dropdown/

GitHub: https://github.com/manishjanky/ngx-select-dropdown

#angular #javascript #angularjs