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如何定位'this'組件html屬性elementRef.nativeElement.querySelector('。content-img')?如何定位這個組件的HTML屬性,有沒有更簡單的方法來獲取這個元素?
有沒有比nativeElement.querySelector更好的方法?
我有一個組件和一個輸入。
從輸入我定位的分量函數是imgChange() 在imgChange()我想靶向組分元素''和得到.offsetWidth
app.ts
<image-component #Img format="png"></image-component>
<input (change)="Img.imgChange($event)" type="file">
圖像component.ts
@Component({
template: `
<ng-content></ng-content>
<div class="content-img"></div>
})
export class ResizingCroppingImagesComponent{
public elementRef;
public _format = 'jpeg';
public img = null;
public sizeW = 230;
public sizeH = 150;
public sizeWmax = 720;
public sizeHmax = 720;
public stateMouse = false;
public stateType = 'none';
public stateR = 'none';
public centerX = 0;
public centerY = 0;
public percent = 100;
public imgUrl = null;
public _top = 0;
public _left = 0;
public _img = {};
public _src = null;
public imgDataUrl;
public origImg;
public imgWidth;
public imgHeight;
imgChange(event) {
const _this = this;
const fileReader = new FileReader();
fileReader.onload = ev => { }
_this._left = (_this.elementRef.nativeElement.querySelector('.content-img').offsetWidth/2) - _this.imgWidth/2;
}
}