获取单击的div的宽度，高度和偏移量-Angular 2 [英] Get the width, height and offset of clicked div - Angular 2

问题描述

我有一个模板，可使用*ngFor创建链接列表，并有一个单独的div元素，我想根据当前活动的链接来更改其位置.

I have a template that creates a list of links using *ngFor and a separate div element that I want to change its location based on the currently active link.

模板:

<div #divHandle
    *ngFor="let link of links; let i = index"
    class="div-link"
    (click)="changeActiveLink(i)">
    <h2>{{link}}</h2>
</div>
<div
[@indexState]="activeLink"
id="highlighter"></div>

这将导致如下结构:

<div class="div-link">
  <div (click)="changeActiveLink(0)"><h2>Link 1</h2></div>
  <div (click)="changeActiveLink(1)"><h2>Link 2</h2></div>
  <div (click)="changeActiveLink(2)"><h2>Longer link 1</h2></div>
  <div (click)="changeActiveLink(3)"><h2>Longer link 2</h2></div>
</div>
<div id="highlighter"></div>

我希望荧光笔div在activeLink = 0时获得Link 1的宽度.类似于这个普通的js:

I want my highlighter div to get the width of Link 1 when activeLink = 0. Similar to this plain js:

var High = document.getElementById('highlighter');
High.style.width = document.getElementsByClass('div-link')[0].children[activeLink].offsetWidth; //activeLink = 0

在我的app.component.ts文件中:

import { Component, AfterViewInit, ViewChildren, Directive, QueryList, ElementRef} from '@angular/core';

@Directive({selector: '[class~=div-link]'})
@Directive({selector: '.div-link'}) // variant
@Directive({selector: '#divHandle'}) // variant
@Directive({selector: '[divHandle]'}) // variant
export class ChildDirective {
    constructor(elem: ElementRef){}
}

@Component({
    selector: 'my-app',
    ...
})
export class AppComponent implements AfterViewInit {
    @ViewChildren(ChildDirective) childrenContent: QueryList<ChildDirective>;

    ngAfterViewInit(){
        console.log(this.childrenContent);
    }
}

当我登录childrenContent时，我得到一个QueryList对象，但它为空，没有元素可用于获取信息.

When I log the childrenContent I get a QueryList object, but it is empty, no elements to get info from.

我尝试了几个@Directive选择器，但我的QueryList始终为空.

I have tried several @Directive selectors and always my QueryList is empty.

推荐答案

您可以使用$ event属性处理宽度，高度，偏移量等.通过使用这种方法，传统的javascript如下发挥作用

You can use the $event property to handle the width, height, offset and so on. By using this method, a traditional javascript comes into play as below

HTML代码将为

<div *ngFor="let link of links;" class="div-link" 
             height="100px"
             width="30px"
             (click)="changeActiveLink($event)">
          <h2>{{link}}</h2>
</div>
<div height="height" width="width" id="highlighter">some text</div>

将从div元素上方单击的元素处理为

Handling the clicked element from above div element as

changeActiveLink(value){
    this.height=value.srcElement.parentElement.attributes['height'].value;
    this.width=value.srcElement.parentElement.attributes['width'].value;
    console.log(this.width);
    console.log(this.height); 
  }

注意:在上面的示例中，click事件在字母上，因此我们将srcElement命名为h2，因此我正在使用parentElement.您可以使用方法内部具有if条件的任何一种方式来实时处理它.

Note: In the above example, the click event is on the letter so we will get the srcElement as h2 so I am using the parentElement. In real time you can handle it with either ways having a if condition inside the method.

您还可以console.log单击的元素，并获得更多实现此想法的方法.

You can also console.log the clicked element and get more idea to achieve this.

实时演示

LIVE DEMO

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