ng2-tag-input

Angular2 Tag Input

This is a component for Angular 2. Design and API are blandly inspired by Angular Material's md-chips.

Demo

Check out the live demo (with source code) here http://www.webpackbin.com/VyLKAtssb.

Quick start. Install the component from NPM by running:

npm install ng2-tag-input --save

If you want to run the tests, run the command:

npm test

Angular 2 Configuration (RC.6)

The component is updated to use the latest version of Angular 2 (RC 5). This means it requires some configuration to correctly work with your app. Ensure, you are registering the following providers when bootstrapping the app:

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { FormsModule } from '@angular/forms';
import { App } from './home/home';

import { NgModule }       from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';

@NgModule({
    imports:      [BrowserModule, FormsModule],
    bootstrap:    [App],
    declarations: [App]
})
export class AppModule {}

platformBrowserDynamic().bootstrapModule(AppModule);

Please do have a look at the file demo/app.ts if you are unsure how to configure the app.

Usage

Ensure you import the module:

import { TagInputModule } from 'ng2-tag-input';

// please notice this is the new way of telling a Component
// to import another component...no more directives[]
@NgModule({
   imports: [TagInputModule]
})
export class MyModule {}

API

@Input

• ngModel - [string[]] - Model of the component. Accepts an array of strings as input.
• placeholder - [?string] - String that sets the placeholder of the input for entering new terms.
• secondaryPlaceholder - [?string] - String that sets the placeholder of the input for entering new terms when there are 0 items entered.
• maxItems - [?number] - Sets the maximum number of items it is possible to enter.
• readonly - [?boolean] - Sets the tag input static, not allowing deletion/addition of the items entered.
• separatorKeys - [?number[]] - Array of keyboard keys with which is possible to define the key for separating terms. By default, only Enter is the defined key.
• transform - [?(item: string) => string] - a function that takes as argument the value of an item, and returns a string with the new value when appended. If the method returns null/undefined/false, the item gets rejected.
• validators - [?Validators[]] - an array of Validators (custom or Angular's) that will validate the tag before adding it to the list of items. It is possible to use multiple validators.
• errorMessages - [?Object{error: message}] - an object whose key is the name of the error (ex. required) and the value is the message you want to display to your users
• autocomplete - [?boolean] - if true, it adds an autocomplete component from which is possible to select items
• autocompleteItems - [?string[]] - an array of items to populate the autocomplete dropdown
• onlyFromAutocomplete - [?boolean] - if true, it will be possible to add new items only from the autocomplete dropdown

@Output

• onAdd - [?onAdd(item: string)] - event fired when an item has been added
• onRemove - [?onRemove(item: string)] - event fired when an item has been removed
• onSelect - [?onSelect(item: string)] - event fired when an item has been selected
• onFocus - [?onFocus(item: string)] - event fired when the input is focused - will return current input value
• onBlur - [?onBlur(item: string)] - event fired when the input is blurred - will return current input value

Basic examples:

// example app

@Component({
    selector: 'app',
    template: `<tag-input [(ngModel)]='items'></tag-input>`
});
export class App {
    items = ['Pizza', 'Pasta', 'Parmesan'];
    options = {
        placeholder: "+ term",
        secondaryPlaceholder: "Enter a new term",
        separatorKeys: [4, 5]
        maxItems: 10
    }
    onItemAdded(item) {
        console.log(``${item} has been added`)
    }
    onItemRemoved(item) {
        console.log(``${item} has been removed :(`)
    }
    // ...
}

// PROPERTIES
<tag-input [(ngModel)]='items'
           [placeholder]="options.placeholder"
           [secondaryPlaceholder]="options.secondaryPlaceholder"
           [maxItems]="options.maxItems"
           [separatorKeys]="options.separatorKeys">
</tag-input>

// EVENTS
<tag-input [(ngModel)]='items'
           (onRemove)="onItemRemoved($event)"
           (onAdd)="onItemAdded($event)">
</tag-input>


// CUSTOM TEMPLATES
// Input tag with a custom template

<tag-input [(ngModel)]='items' #input> // create a reference #input to the controller in order to use its API
    <div class='tag' *ngFor='let item of input.value'> // loop over the items
        <div class='tag__name'> {{ item }} </span> // display its values
        <span (click)="input.remove(item)">
            Remove me
        </span>
    </div>
</tag-input>

If you want to see more advanced examples, please have a look at http://www.webpackbin.com/VyLKAtssb.