如何使用angular2和Typescript从HTMLElement获取样式值

可以从HTMLElement读取值吗?

以下代码可以工作,但在向后转换中有一点延迟。这就是我需要从_target元素得到高度值的点。

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

@Directive({
selector: '[accordion]'

})
export class AccordionDirective implements OnInit{
   private _listener:Function;
   private _active = false;
   private _height;

   @Input('accordion') _target:HTMLElement;

   constructor(private _renderer:Renderer,
               private element:ElementRef) {
   }

   ngOnInit() {

    this._renderer.setElementStyle(this._target, 'max-height', '0em');
    this._renderer.setElementClass(this._target, 'slider', true); // set css transition to the target element

    this._listener = this._renderer.listen(this.element.nativeElement, 'click', () => {

        if(!this._active){
            this._renderer.setElementStyle(this._target, 'max-height', '50em'); <-- here is the variable height needed
        }else{
            this._renderer.setElementStyle(this._target, 'max-height', '0em');
        }
        this._active = !this._active;
        });
     }
   }