Native UI Select Angular component (demo)

ngx-select-ex

Native Angular component for Select

• Requires Angular version 5 or higher!
• Compatible with Angular version 4.
• Compatible with Bootstrap 3 and Bootstrap 4

Usage

1. Install ngx-select-ex through npm package manager using the following command:

   npm i ngx-select-ex --save

   For usage with Angular 4 install using the following command:

   npm i ngx-select-ex@ng4 --save

2. Add NgxSelectModule into your AppModule class. app.module.ts would look like this:

   import {NgModule} from '@angular/core';
   import {BrowserModule} from '@angular/platform-browser';
   import {AppComponent} from './app.component';
   import { NgxSelectModule } from 'ngx-select-ex';
   
   @NgModule({
     imports: [BrowserModule, NgxSelectModule],
     declarations: [AppComponent],
     bootstrap: [AppComponent],
   })
   export class AppModule {
   }

   If you want to change the default options then use next code:

   import {NgModule} from '@angular/core';
   import {BrowserModule} from '@angular/platform-browser';
   import {AppComponent} from './app.component';
   import { NgxSelectModule, INgxSelectOptions } from 'ngx-select-ex';
   
   const CustomSelectOptions: INgxSelectOptions = { // Check the interface for more options
       optionValueField: 'id',
       optionTextField: 'name'
   };
   
   @NgModule({
     imports: [BrowserModule, NgxSelectModule.forRoot(CustomSelectOptions)],
     declarations: [AppComponent],
     bootstrap: [AppComponent],
   })
   export class AppModule {
   }

3. Include Bootstrap styles. For example add to your index.html

   <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css">

4. Add the tag <ngx-select> into some html

   <ngx-select [items]="items" [(ngModel)]="itemId"></ngx-select>

5. More information regarding of using ngx-select-ex is located in demo.

API

Any item can be disabled for prevent selection. For disable an item add the property disabled to the item.

Input	Type	Default	Description
[items]	any[]	[]	Items array. Should be an array of objects with id and text properties. As convenience, you may also pass an array of strings, in which case the same string is used for both the ID and the text. Items may be nested by adding a options property to any item, whose value should be another array of items. Items that have children may omit to have an ID.
optionValueField	string	'id'	Provide an opportunity to change the name an id property of objects in the items
optionTextField	string	'text'	Provide an opportunity to change the name a text property of objects in the items
optGroupLabelField	string	'label'	Provide an opportunity to change the name a label property of objects with an options property in the items
optGroupOptionsField	string	'options'	Provide an opportunity to change the name of an options property of objects in the items
[multiple]	boolean	false	Mode of this component. If set true user can select more than one option
[allowClear]	boolean	false	Set to true to allow the selection to be cleared. This option only applies to single-value inputs
[placeholder]	string	''	Set to true Placeholder text to display when the element has no focus and selected items
[noAutoComplete]	boolean	false	Set to true Set to true to hide the search input. This option only applies to single-value inputs
[keepSelectedItems]	boolean	false	Storing the selected items when the item list is changed
[disabled]	boolean	false	When true, it specifies that the component should be disabled
[defaultValue]	any[]	[]	Use to set default value
autoSelectSingleOption	boolean	false	Auto select a non disabled single option
autoClearSearch	boolean	false	Auto clear a search text after select an option. Has effect for multiple = true
noResultsFound	string	'No results found'	The default text showed when a search has no results
size	'small'/'default'/'large'	'default'	Adding bootstrap classes: form-control-sm, input-sm, form-control-lg input-lg, btn-sm, btn-lg
searchCallback	(search: string, item: INgxSelectOption) => boolean	null	The callback function for custom filtering the select list
autoActiveOnMouseEnter	boolean	true	Automatically activate item when mouse enter on it

Output	Description
(typed)	Fired on changing search input. Returns string with that value.
(focus)	Fired on select focus
(blur)	Fired on select blur
(open)	Fired on select dropdown open
(close)	Fired on select dropdown close
(select)	Fired on an item selected by user. Returns value of the selected item.
(remove)	Fired on an item removed by user. Returns value of the removed item.
(navigated)	Fired on navigate by the dropdown list. Returns: INgxOptionNavigated.
(selectionChanges)	Fired on change selected options. Returns: INgxSelectOption[].

Warning! Although the component contains the select and the remove events, the better solution is using valueChanges of the FormControl.

import {Component} from '@angular/core';
import {FormControl} from '@angular/forms';

@Component({
    selector: 'app-example',
    template: `<ngx-select [items]="['111', '222']" [formControl]="selectControl"></ngx-select>`
})
class ExampleComponent {
    public selectControl = new FormControl();
    
    constructor() {
        this.selectControl.valueChanges.subscribe(value => console.log(value));
    }
}

Styles and customization

Currently, the component contains CSS classes named within BEM Methodology. As well it contains the "Bootstrap classes". Recommended use BEM classes for style customization.

List of styles for customization:

• ngx-select - Main class of the component.
• ngx-select_multiple - Modifier of the multiple mode. It's available when the property multiple is true.
• ngx-select__disabled - Layer for the disabled mode.
• ngx-select__selected - The common container for displaying selected items.
• ngx-select__toggle - The toggle for single mode. It's available when the property multiple is false.
• ngx-select__placeholder - The placeholder item. It's available when the property multiple is false.
• ngx-select__selected-single - The selected item with single mode. It's available when the property multiple is false.
• ngx-select__selected-plural - The multiple selected item. It's available when the property multiple is true.
• ngx-select__allow-clear - The indicator that the selected single item can be removed. It's available while properties the multiple is false and the allowClear is true.
• ngx-select__toggle-buttons - The container of buttons such as the clear and the toggle.
• ngx-select__toggle-caret - The drop-down button of the single mode. It's available when the property multiple is false.
• ngx-select__clear - The button clear.
• ngx-select__clear-icon - The cross icon.
• ngx-select__search - The input field for full text lives searching.
• ngx-select__choices - The common container of items.
• ngx-select__item-group - The group of items.
• ngx-select__item - An item.
• ngx-select__item_disabled - Modifier of a disabled item.
• ngx-select__item_active - Modifier of the activated item.

Templates

For extended rendering customisation you are can use the ng-template:

<ngx-select [items]="items" optionValueField="hex" optionTextField="name" [(ngModel)]="ngxValue">

    <ng-template ngx-select-option-selected let-option let-text="text">
        <span class="color-box" [style]="style('background-color:' + option.value)"></span>
        <span [innerHtml]="text"></span>
        ({{option.data.hex}})
    </ng-template>

    <ng-template ngx-select-option let-option let-text="text">
        <span class="color-box" [style]="style('background-color:' + option.value)"></span>
        <span [innerHtml]="text"></span>
        ({{option.data.hex}})
    </ng-template>

    <ng-template ngx-select-option-not-found>
        Nothing found
    </ng-template>

</ngx-select>

Also, you are can mix directives for reducing template:

<ngx-select [items]="items" optionValueField="hex" optionTextField="name" [(ngModel)]="ngxValue">
    <ng-template ngx-select-option-selected ngx-select-option let-option let-text="text">
        <span class="color-box" [style]="style('background-color:' + option.value)"></span>
        <span [innerHtml]="text"></span>
        ({{option.data.hex}})
    </ng-template>

    <ng-template ngx-select-option-not-found let-input>
        Not found <button (click)="addItem(input)">(+) Add "{{input}}" as new item</button>
    </ng-template>
</ngx-select>

Description details of the directives:

1. ngx-select-option-selected - Customization rendering selected options. Representing variables:
   • option (implicit) - object of type INgxSelectOption.
   • text - The text defined by the property optionTextField.
   • index - Number value of index the option in the select list. Always equal to zero for the single select.
2. ngx-select-option - Customization rendering options in the dropdown menu. Representing variables:
   • option (implicit) - object of type INgxSelectOption.
   • text - The highlighted text defined by the property optionTextField. It is highlighted in the search.
   • index - Number value of index for the top level.
   • subIndex - Number value of index for the second level.
3. ngx-select-option-not-found - Customization "not found text". Does not represent any variables.

Troubleshooting

Please follow this guidelines when reporting bugs and feature requests:

1. Use GitHub Issues board to report bugs and feature requests (not our email address)
2. Please always write steps to reproduce the error. That way we can focus on fixing the bug, not scratching our heads trying to reproduce it.

Thanks for understanding!

Contribute

• npm start - Run demo for local debugging.
• npm test - Run unit tests only once. Use ng test for running tests with files watching.
• npm run build - Build the demo & package for release & publishing.

After build you will be able:

• Install the component to another project by npm install /path/to/ngx-select-ex/dist.
• Link another project to the component npm link /path/to/ngx-select-ex/dist. Warning! Then use the flag --preserve-symlinks

Do not forget make a pull request to the ngx-select-ex

License

The MIT License (see the LICENSE file for the full text)