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

• Angular 7.0.0 and more

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
• 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
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' or 'hidden' or 'always'		'default'	display the search box (default : is based on minCountForSearch)
placeholder	string			the placeholder string if nothing selected
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 with multiple)
limitSelection	number		0	to limit multiple selection (0 = unlimited)
hideSelectedItems	boolean		false	for multiple, remove selected values
resultMaxHeight	string			change the height size of results
listPosition	'below' or 'above'		'below'	the position for the dropdown list
material	boolean		false	enable material style
nostyle	boolean		false	remove border and background color
templates	TemplateRef or {option?: TemplateRef, group?: TemplateRef} or {templateId1: TemplateRef, ...}			use templates for formatting content (see Templating)
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

select2 data structure

type Select2Data = (Select2Group | Select2Option)[];

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;
}

type Select2Value = string | number | boolean;

type Select2UpdateValue = Select2Value | Select2Value[];

export interface Select2UpdateEvent<U extends Select2UpdateValue = Select2Value> {
    component: Select2;
    value: U;
    options: Select2Option[];
}

export interface Select2SearchEvent<U extends Select2UpdateValue = Select2Value> {
    component: Select2;
    value: U;
    search: string;
}

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' 
    }
]

CSS variables (doesn't work on IE11)

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 {
    /* 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: #444;

    /* 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;

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

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

    /* dropdown panel */
    --select2-dropdown-background: #fff;
    --select2-dropdown-border-color: #aaa;

    /* 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;

    /* 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;
}

For IE11, see css-vars-ponyfill.

Publishing the library

npm run build:lib
cd dist/ng-select2-component
npm publish

Update Demo

npm run build:demo

License

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

Changelog

V7.2.3 (2021-03-11)

Corrections

• fix crash when switching between multiple and non-multiple

Demo

• add html generator