Angular10 Trigger Animation

In this article, we are going to see what is trigger in Angular 10 and how to use it.

The trigger in Angular10 is used to create an animation trigger containing state and transition of the animation.

Syntax:

animate(name | definitions)

NgModule: Module used by trigger is:

• animations

Approach: 

• Create an angular app that to be used.
• In app.module.ts, import BrowserAnimationsModule.
• In app.component.html, make a div which will contain the animation element.
• In app.component.ts, import the trigger, state, style, transition, animate to be used.
• Make the trigger containing state and transition for the animation.
• Serve the angular app using ng serve to see the output.

Parameters:

• Name: Sets an identifying string.
• definitions: Sets an animation definition object.

Return Value:

• AnimationTriggerMetadata: An object that encapsulates the trigger data.

Example:

app.module.ts

import { LOCALE_ID, NgModule }
from '@angular/core';

import { BrowserModule }
from '@angular/platform-browser';
import {BrowserAnimationsModule}
from '@angular/platform-browser/animations';
import { AppRoutingModule }
from './app-routing.module';
import { AppComponent }
from './app.component';

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    AppRoutingModule,
    BrowserAnimationsModule
  ],
  providers: [
      { provide: LOCALE_ID, useValue: 'en-GB' },
  ],
  bootstrap: [AppComponent]
})
export class AppModule { }

app.component.ts

import {
  // Trigger is imported here
  trigger,
  state,
  style,
  transition,
  animate } from '@angular/animations';
import { Component } from '@angular/core';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: [ './app.component.css' ],
  animations: [

    // Trigger is used here
    trigger('geek',[
      state('green', style({
        'background-color': 'green',
        transform: 'translateX(0)'
      })),
      state('blu', style({
        'background-color': '#49eb34',
        transform: 'translateX(0)'
      })),
      transition('green => blu',animate(1200)),
      transition('blu => green',animate(1000))
    ])
  ]
})
export class AppComponent  {
  state = 'green';
  anim(){
    this.state == 'green' ?
    this.state = 'blu' : this.state = 'green';
  }
}

app.component.html

<h1>GeeksforGeeks</h1>
<button (click)='anim()'>Animate</button>
<br>
<br>
<div
  style="width: 150px; height: 100px; border-radius: 5px;"
  [@geek]='state'>
</div>

Output:

Reference: https://angular.io/api/animations/trigger