Here I have created the directive, which emit events on mouse wheel scroll upward and downward
You can use these directives for image zoom-in and zoom-out. Element binds to event DOMMouseScroll ( for firefox ), mousewheel ( for chrome), onmousewheel (for IE)
Directive for Mouse Wheel Scroll Up
HTML Usage
<div mouseWheel (mouseWheelUp)="mouseWheelUpFunc(event)" (mouseWheelDown)="mouseWheelDownFunc(event)"></div>
mousewheel.directive.ts
This is attribute directive which catches the mouse wheel scroll event on all type of browsers
import { Directive, Output, HostListener, EventEmitter } from '@angular/core'; @Directive({ selector: '[mouseWheel]' }) export class MouseWheelDirective { @Output() mouseWheelUp = new EventEmitter(); @Output() mouseWheelDown = new EventEmitter(); @HostListener('mousewheel', ['$event']) onMouseWheelChrome(event: any) { this.mouseWheelFunc(event); } @HostListener('DOMMouseScroll', ['$event']) onMouseWheelFirefox(event: any) { this.mouseWheelFunc(event); } @HostListener('onmousewheel', ['$event']) onMouseWheelIE(event: any) { this.mouseWheelFunc(event); } mouseWheelFunc(event: any) { var event = window.event || event; // old IE support var delta = Math.max(-1, Math.min(1, (event.wheelDelta || -event.detail))); if(delta > 0) { this.mouseWheelUp.emit(event); } else if(delta < 0) { this.mouseWheelDown.emit(event); } // for IE event.returnValue = false; // for Chrome and Firefox if(event.preventDefault) { event.preventDefault(); } } }
app.module.ts
We should import above directive and include in this 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 { }
it's really perfect but can you give me little tip ,how can I disable this directive.
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This solution works with angular 4 too. scroll event no longer works with Ng4
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ReplyDeleteThanks man, worked like a charm in angular 4.
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ReplyDeleteAwesome, good job and easy to integrate!
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ReplyDeletethis is not good.i can't scroll down
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