In previous article, I have written Angular 2 Directive for mouse wheel scroll. Here in this example we will use that directive. So please read previous article before going through this example.
Program Flow
- Width of the image can be manipulated by [style.width] pre-defined directive. Initialise width for the image as imgWidth = 300
- On Mouse scroll up increment imgWidth by 10 and assign to imgWidth
- On Mouse scroll down decrement imgWidth by 10 and assign to imgWidth
Markup
<img mouseWheel [style.width]="imgWidth" src="sample.png" (mouseWheelUp)="mouseWheelUpFunc()" (mouseWheelDown)="mouseWheelDownFunc()"/>
app.component.ts
When user scrolls upward, mouseWheelUpFunc will be called. If user scrolls downward, mouseWheelDownFunc will be called.
import { Component } from '@angular/core'; @Component({ selector: 'my-app', template: ` <h2>Mouse wheel scroll on below image</h2> <img mouseWheel [style.width]="imgWidth" src="sample.png" (mouseWheelUp)="mouseWheelUpFunc()" (mouseWheelDown)="mouseWheelDownFunc()"/> ` }) export class AppComponent { mouseWheelDir: string = ''; imgWidth: number = 300; mouseWheelUpFunc() { console.log('mouse wheel up'); this.imgWidth = this.imgWidth+10; } mouseWheelDownFunc() { console.log('mouse wheel down'); this.imgWidth = this.imgWidth-10; } }
app.module.ts
Now include mouseWheelDirective in app module.
import { NgModule } from '@angular/core'; import { BrowserModule } from '@angular/platform-browser'; import { AppComponent } from './app.component'; import { MouseWheelDirective } from './mousewheel.directive'; @NgModule({ imports: [ BrowserModule ], declarations: [ AppComponent, MouseWheelDirective ], bootstrap: [ AppComponent ] }) export class AppModule { }
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