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refactor(components): ViewChild instead of querying dom

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This commit is contained in:
nixa 2016-05-20 20:00:36 +03:00
parent b05f525a7c
commit d1307b8f58
4 changed files with 10 additions and 15 deletions
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10
src/app/theme/components/baBackTop/baBackTop.component.ts
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@ -1,10 +1,10 @@
import {Component, HostListener, Input, ElementRef} from '@angular/core';
import {Component, ViewChild, HostListener, Input, ElementRef} from '@angular/core';
@Component({
selector: 'ba-back-top',
styles: [require('./baBackTop.scss')],
template: `
<i class="fa fa-angle-up back-top ba-back-top" title="Back to Top"></i>
<i #baBackTop class="fa fa-angle-up back-top ba-back-top" title="Back to Top"></i>
`
})
export class BaBackTop {
@ -13,7 +13,9 @@ export class BaBackTop {
@Input() showSpeed:number = 500;
@Input() moveSpeed:number = 1000;
constructor (private _elementRef:ElementRef) {
@ViewChild('baBackTop') private _selector:ElementRef;
ngAfterViewInit () {
this._onWindowScroll();
}
@ -25,7 +27,7 @@ export class BaBackTop {
@HostListener('window:scroll')
_onWindowScroll():void {
let el = this._elementRef.nativeElement.querySelector('.ba-back-top');
let el = this._selector.nativeElement;
window.scrollY > this.position ? $(el).fadeIn(this.showSpeed) : $(el).fadeOut(this.showSpeed);
}
}