javascript – angular 2垂直调整div

我是angular2的新手,我一直在努力创建一个可调整大小的div(垂直).但我无法做到这一点.我尝试过使用指令

这是我的指示

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

@Directive({
  selector: '[appNgxResizer]'
})
export class NgxResizerDirective {

  constructor(private el: ElementRef) {
  }

  @HostListener('mousemove', ['$event']) resize(e) {
    this.el.nativeElement.parentNode.style.height = (e.clientY - this.el.nativeElement.parentNode.offsetTop) + 'px';
    event.preventDefault();
  }

  @HostListener('mouseup', ['$event']) stopResize(e) {
    event.preventDefault();
  }
}

这是我尝试过https://stackblitz.com/edit/angular-text-resizable-q6ddyy的stackblitz

我想点击抓取来调整div的大小.像这样的东西https://jsfiddle.net/zv2ep6eo/.

谢谢.

解决方法:

我想你错过了保持高度旧值的部分,加上检查鼠标上的状态以及听mousedown.我没有在下面的例子中指出它,但它会很复杂.

Stackblitz example

打字稿：

  height = 150;
  y = 100;
  oldY = 0;
  grabber = false;

  @HostListener('document:mousemove', ['$event'])
  onm ouseMove(event: MouseEvent) {
    if (!this.grabber) {
        return;
    }
    this.resizer(event.clientY - this.oldY);
    this.oldY = event.clientY;
  }

  @HostListener('document:mouseup', ['$event'])
  onm ouseUp(event: MouseEvent) {
    this.grabber = false;
  }

  resizer(offsetY: number) {
    this.height += offsetY;
  }


  @HostListener('document:mousedown', ['$event'])
  onm ouseDown(event: MouseEvent) {
    this.grabber = true;
    this.oldY = event.clientY;
    event.preventDefault();
  }

HTML

<div class="textarea" [style.height.px]='height' contenteditable="true" >
  this is a text area
  <div class="grabber"></div>  
</div>