Ng-select2-component NPM

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
`ngModelidrequireddisabledreadonlytabIndex`				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;
}