javascript - 我的代码向动态元素添加点击监听器有什么问题？

Question

我有一个应用程序，我应该在其中获取动态文本，将所有出现的字符串替换为特定标记，然后向该标记添加点击监听器，以便我可以向该标记应用新样式。

我尝试使用 jQuery，但它不应用监听器，这是我的组件，有什么想法吗？

template:
<div class="text-wrapper" [innerHTML]="text"></div>


export class FinderPage implements OnInit{

  chosedLetter: string = 'i';
  text = 'Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae vitae dicta sunt explicabo. Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit, sed quia non numquam eius modi tempora incidunt ut labore et dolore magnam aliquam quaerat voluptatem. Ut enim ad minima veniam, quis nostrum exercitationem ullam corporis suscipit laboriosam, nisi ut aliquid ex ea commodi consequatur? Quis autem vel eum iure reprehenderit qui in ea voluptate velit esse quam nihil molestiae consequatur, vel illum qui dolorem eum fugiat quo voluptas nulla pariatur?';

  constructor() {}

  ngOnInit(){
    let regex = new RegExp(this.chosedLetter, 'g');

    this.text = this.text.replace(regex, `<span class="chosen-letter">${this.chosedLetter}</span>`);

    setTimeout(() => { //desperate measure with settimeout... :/
      
      $( ".chosen-letter" ).click(function(event) {
        event.stopPropagation();
        event.stopImmediatePropagation();
        $( this ).toggleClass('marked');
        alert('aaa')
      });
    }, 100);
  }

}

Answer 1

看看这个 StackBlitz project 。我认为它可以实现您想要做的事情。

这段代码几乎是这样的:

@Component({
  selector: "my-app",
  template: '<div class="text-wrapper" [innerHTML]="text"></div>',
})
export class AppComponent implements OnInit, AfterViewInit {
  chosedLetter: string = 'm'; // 'm' is easier to click than 'i'!
  text: string | SafeHtml = 'A very long string.';

  constructor(
    private elementRef: ElementRef,
    private renderer: Renderer2,
    private sanitizer: DomSanitizer
  ) {}

  ngOnInit() {
    const regex = new RegExp(this.chosedLetter, 'g');
    const span = `<span class="chosen-letter")">${this.chosedLetter}</span>`;
    const plainText = this.text as string;
    const newText = plainText.replace(regex, span);
    this.text = this.sanitizer.bypassSecurityTrustHtml(newText);
  }

  ngAfterViewInit() {
    const elements = this.elementRef.nativeElement.querySelectorAll('.chosen-letter');
    elements.forEach(element => {
      this.renderer.listen(element, 'click', event => {
        element.classList.toggle('marked');
        console.log('Clicked on ' + this.chosedLetter);
      });
    });
  }
}