ng-select2-component

Select2

This Angular CLI module it's a fork of select2-component without Vue & React. For Vue or React, please use the original component.

Installation

npm i ng-select2-component --save

Requirements

• peerDependencies:

  • angular 17.0.0 and more
  • angular/cdk 17.0.0 and more

• dependencies (include):

  • ngx-infinite-scroll 17.0.0 and more

Note:

• For angular 7, 8 and 9 (View Engine): use version 7.3.1.
• For angular 10, 11 and 12 (View Engine): use version 8.1.0.
• For angular 13 (Ivy): use version 9.0.0.
• For angular 14 (Ivy): use version 10.0.0.
• For angular 15 (Ivy): use version 11.0.0.
• For angular 16 and more (Ivy): use version 12.0.0.
• For angular 16.1 and more (Ivy): use version 13.0.0.
• For angular 17 and more (Ivy): use version 14.0.0.

Demo

See a demo.

Features

• select one
• options or groups
• scroll
• local search
• select by keyboard
• disabled option
• disabled component
• hide search box
• placeholder
• multiple selection
• add items not found in multiple
• material style
• form binding
• templating

Usage

example

import { Select2Module } from 'ng-select2-component';

@NgModule({
    imports: [BrowserModule, FormsModule, Select2Module],
    declarations: [MainComponent],
    bootstrap: [MainComponent],
})
class MainModule {}

<select2 [data]="data" [value]="value" (update)="update($event)"> </select2>

properties and events of the component

name	type	status	default	description	required
data	Select2Data	required		the data of the select2
value	Select2Value			initial value
minCharForSearch	number		0	start the search when the number of characters is reached (0 = unlimited)
minCountForSearch	number		6	hide search box if options.length < minCountForSearch
displaySearchStatus	'default' 'hidden' 'always'		'default'	display the search box (default : is based on minCountForSearch)
placeholder	string			the placeholder string if nothing selected
noResultMessage	string			the message string if no results when using the search field
customSearchEnabled	boolean		false	will trigger search event, and disable inside filter
multiple	boolean		false	select multiple options
resettable	boolean		false	add a button to reset value	not multiple
resetSelectedValue	any		undefined	selected option when × is clicked	not multiple and with resettable
autoCreate	boolean		false	gives the possibility to add elements not present in the list.
limitSelection	number		0	to limit multiple selection (0 = unlimited)
hideSelectedItems	boolean		false	remove selected values	with multiple
resultMaxHeight	string		'200px'	change the height size of results
maxResults	number		0	maximum results limit (0 = unlimited)
maxResultsMessage	string		'Too much result…'	message when maximum result
listPosition	'below' 'above' 'auto' ¹		'below'	the position for the dropdown list	¹ 'auto': only with overlay
infiniteScroll	boolean		false	active infiniteScroll on dropdown list	with ngx-infinite-scroll
infiniteScrollDistance	number		1.5	infiniteScroll distance	with ngx-infinite-scroll
infiniteScrollThrottle	number		150	infiniteScroll throttle
overlay	boolean		false	active an overlay mode for dropdown list (with angular cdk). (See Overlay)
styleMode	'default' 'material' 'noStyle' 'borderless'		'default'	change style for material style or remove border and background color
templates	TemplateRef {option?: TemplateRef, group?: TemplateRef} {templateId1: TemplateRef, ...}			use templates for formatting content (see Templating)
noLabelTemplate	boolean		false	do not use the template in the selection, stay in text mode
editPattern	(str: string) => string			use it for change the pattern of the filter search
ngModel id required disabled readonly tabIndex				just like a select control
(update)	(event: Select2UpdateEvent) => void	event		triggered when user select an option
(open)	(event: Select2) => void	event		triggered when user open the options
(close)	(event: Select2) => void	event		triggered when user close the options
(focus)	(event: Select2) => void	event		triggered when user enters the component
(blur)	(event: Select2) => void	event		triggered when user leaves the component
(search)	(event: Select2SearchEvent) => void	event		triggered when search text changed	with customSearchEnabled
(scroll)	(event: Select2ScrollEvent) => void	event		triggered when infiniteScroll is on up or down position	with ngx-infinite-scroll
(removeOption)	(event: Select2RemoveEvent) => void	event		triggered when an option is removed from the list of selected options options list	with multiple
(autoCreateItem)	(event: Select2AutoCreateEvent) => void	event		triggered when a new item has been added	with autoCreate

select2 data structure

export interface Select2Group {
    /** label of group */
    label: string;
    /** options list */
    options: Select2Option[];
    /** add classes  */
    classes?: string;
    /** template id  */
    templateId?: string;
    /** template data  */
    data?: any;
}

export interface Select2Option {
    /** value  */
    value: Select2Value;
    /** label of option */
    label: string;
    /** no selectable is disabled */
    disabled?: boolean;
    /** for identification */
    id?: string;
    /** add classes  */
    classes?: string;
    /** template id  */
    templateId?: string;
    /** template data  */
    data?: any;
    /** hide this option */
    hide?: boolean;
}

export type Select2Value = string | number | boolean | object;

export type Select2UpdateValue = Select2Value | Select2Value[];

export type Select2Data = (Select2Group | Select2Option)[];

export interface Select2UpdateEvent<U extends Select2UpdateValue = Select2Value> {
    /** component */
    readonly component: Select2;
    /** current selected value */
    readonly value: U;
    /** selected option */
    readonly options: Select2Option[];
}

export interface Select2AutoCreateEvent<U extends Select2UpdateValue = Select2Value> {
    /** component */
    readonly component: Select2;
    /** current selected value */
    readonly value: U;
    /** selected option */
    readonly options: Select2Option[];
}

export interface Select2SearchEvent<U extends Select2UpdateValue = Select2Value> {
    /** component */
    readonly component: Select2;
    /** current selected value */
    readonly value: U;
    /** search text */
    readonly search: string;
    /** current data source */
    readonly data: Select2Data;
    /** method to call to update the data */
    readonly filteredData: (data: Select2Data) => void;
}

export interface Select2RemoveEvent<U extends Select2UpdateValue = Select2Value> {
    /** component */
    readonly component: Select2;
    /** current selected value */
    readonly value: U;
    /** remove */
    readonly removedOption: Select2Option;
}

export interface Select2ScrollEvent {
    /** component */
    readonly component: Select2;
    /** scroll way */
    readonly way: 'up' | 'down';
    /** search text */
    readonly search: string;
    /** current data */
    readonly data: Select2Data;
}

Templating

Unique template

<select2 [data]="data" [templates]="template">
    <ng-template #template let-data="data"><strong>{{data?.color}}</strong>: {{data?.name}}</ng-template>
</select2>

const data: Select2Data = [
    {
        value: 'heliotrope',
        label: 'Heliotrope',
        data: { color: 'white', name: 'Heliotrope' },
    },
    {
        value: 'hibiscus',
        label: 'Hibiscus',
        data: { color: 'red', name: 'Hibiscus' },
    },
];

Template group & option

<select2 [data]="data" [templates]="{option : option, group: group}">
    <ng-template #option let-data="data">{{data?.name}}</ng-template>
    <ng-template #group let-label="label">Group: {{label}}</ng-template>
</select2>

No difference in data structure. The template is defined by its type, option or group, automatically.

Template by templateId

<select2 [data]="data" [templates]="{template1 : template1, template2: template2}">
    <ng-template #template1 let-data="data">{{data?.name}}</ng-template>
    <ng-template #template2 let-label="label" let-data="data">{{label}} : {{data?.color}}</ng-template>
</select2>

const data: Select2Data = [
    {
        value: 'heliotrope',
        label: 'Heliotrope',
        data: { color: 'white', name: 'Heliotrope' },
        templateId: 'template1',
    },
    {
        value: 'hibiscus',
        label: 'Hibiscus',
        data: { color: 'red', name: 'Hibiscus' },
        templateId: 'template2',
    },
];

Overlay

If the overlay mode is used / activated, add to the project root in CSS (with ViewEncapsulation.None)

@import '~@angular/cdk/overlay-prebuilt.css';

CSS variables

It's possible to change different colors (and more) with CSS variables without having to modify them with ::ng-deep or other CSS rules :

:root {
    /* size */
    --select2-single-height: 28px;
    --select2-multiple-height: 28px;

    /* label */
    --select2-label-text-color: #000;
    --select2-required-color: red;

    /* selection */
    --select2-selection-border-radius: 4px;
    --select2-selection-background: #fff;
    --select2-selection-disabled-background: #eee;
    --select2-selection-border-color: #aaa;
    --select2-selection-focus-border-color: #000;
    --select2-selection-text-color: #111;
    --select2-selection-line-height: 28px;
    --select2-selection-padding: 0 0 0 8px;

    /* selection (multiple) */
    --select2-selection-multiple-gap: 2px 5px;
    --select2-selection-multiple-padding: 2px 5px;

    /* selection: choice item (multiple) */
    --select2-selection-choice-background: #e4e4e4;
    --select2-selection-choice-text-color: #000;
    --select2-selection-choice-border-color: #aaa;
    --select2-selection-choice-close-color: #999;
    --select2-selection-choice-hover-close-color: #333;

    /* placeholder */
    --select2-placeholder-color: #999;
    --select2-placeholder-overflow: ellipsis;

    /* no result message */
    --select2-no-result-color: #888;
    --select2-no-result-font-style: italic;

    /* no result message */
    --select2-too-much-result-color: #888;
    --select2-too-much-result-style: italic;

    /* reset */
    --select2-reset-color: #999;

    /* arrow */
    --select2-arrow-color: #888;

    /* dropdown panel */
    --select2-dropdown-background: #fff;
    --select2-dropdown-border-color: #aaa;
    --select2-dropdown-above-border-bottom: none;
    --select2-dropdown-above-border-bottom-left-radius: 0;
    --select2-dropdown-above-border-bottom-right-radius: 0;
    --select2-dropdown-below-border-top: none;
    --select2-dropdown-below-border-top-left-radius: 0;
    --select2-dropdown-below-border-top-right-radius: 0;

    /* overlay */
    --select2-overlay-backdrop: transparent;

    /* search field */
    --select2-search-border-color: #aaa;
    --select2-search-background: #fff;
    --select2-search-border-radius: 0px;

    /* dropdown option */
    --select2-option-text-color: #000;
    --select2-option-disabled-text-color: #999;
    --select2-option-disabled-background: transparent;
    --select2-option-selected-text-color: #000;
    --select2-option-selected-background: #ddd;
    --select2-option-highlighted-text-color: #fff;
    --select2-option-highlighted-background: #5897fb;
    --select2-option-group-text-color: gray;
    --select2-option-group-background: transparent;
    --select2-option-padding: 6px;

    /* hint */
    --select2-hint-text-color: #888;

    /* for Material ------------------------------------------*/
    --select2-material-underline: #ddd;
    --select2-material-underline-active: #5a419e;
    --select2-material-underline-disabled: linear-gradient(
        to right,
        rgba(0, 0, 0, 0.26) 0,
        rgba(0, 0, 0, 0.26) 33%,
        transparent 0
    );
    --select2-material-underline-invalid: red;
    --select2-material-placeholder-color: rgba(0, 0, 0, 0.38);
    --select2-material-selection-background: #ddd;
    --select2-material-option-selected-background: rgba(0, 0, 0, 0.04);
    --select2-material-option-highlighted-text-color: #000;
    --select2-material-option-selected-text-color: #ff5722;
}

Publishing the library

npm run build:lib
npm run publish:lib

Update Demo

npm run build:demo

License

Like Angular, this module is released under the permissive MIT license. Your contributions are always welcome.