如何在指令和组件中获取元素的宽度/高度? [英] How to get element's width/height within directives and component?

问题描述

@Component({
    selector: '.donation',
    template: `
    <figure id="donation" move>
        <img src="image/qrcode.png"/>
        <figcaption>
        Buy me a cup of coffee.
        </figcaption>
    </figure>
    `
})
export class DonationComponent{}

@Directive({
    selector: '[move]'
})
export class MoveDirective{}

嘿，我想在 MoveDirective 和 DonationComponent 中获取

元素的宽度/高度.我已多次阅读文档，但仍然找不到解决此问题的方法.有人知道这个吗?非常感谢！

Hey, I want to get the <figure id="donation"> element's width/height within MoveDirective and DonationComponent. I have read the documentation several times but still cannot find a way to this answer. Does somebody know this? Thanks a lot!

推荐答案

可以使用ElementRef如下图，

演示:https://plnkr.co/edit/XZwXEh9PZEEVJpe0BlYq?p=预览检查浏览器的控制台.

DEMO : https://plnkr.co/edit/XZwXEh9PZEEVJpe0BlYq?p=preview check browser's console.

import { Directive, Input, Output, ElementRef, Renderer } from '@angular/core';

@Directive({
  selector:"[move]",
  host:{
    '(click)':"show()"
  }
})

export class GetEleDirective{
  
  constructor(private el:ElementRef) { }

  show(){
    console.log(this.el.nativeElement);
    
    console.log('height---' + this.el.nativeElement.offsetHeight);  //<<<===here
    console.log('width---' + this.el.nativeElement.offsetWidth);    //<<<===here
  }
}

同样，您可以在任何需要的地方在组件中使用它.

Same way you can use it within component itself wherever you need it.

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