angular - 手动清理字符串

Question

我有一个 textarea，用户可以在其中输入一些文本。文本不能是 JavaScript 或 HTML 等。我想手动清理数据并将其保存为字符串。

我不知道如何使用 DomSanitizationService 手动清理我的数据。

如果我在页面上执行 {{ textare_text }}，那么数据就会被正确清理。

如何手动对我拥有的 string 执行此操作？

Answer 1

您可以按如下方式清理 HTML:

import { Component, SecurityContext } from '@angular/core';
import { DomSanitizer, SafeHtml } from '@angular/platform-browser';

@Component({
  selector: 'my-app',
  template: `
  <div [innerHTML]="_htmlProperty"></div>
  `
})
export class AppComponent {

  _htmlProperty: string = 'AAA<input type="text" name="name">BBB';

  constructor(private _sanitizer: DomSanitizer){ }

  public get htmlProperty() : SafeHtml {
     return this._sanitizer.sanitize(SecurityContext.HTML, this._htmlProperty);
  }

}

Demo plunker here .

---

根据您的评论，您实际上想要转义而不是 sanitizer 。

为此，check this plunker, where we have both escaping and sanitization .

import { Component, SecurityContext } from '@angular/core';
import { DomSanitizer, SafeHtml } from '@angular/platform-browser';

@Component({
  selector: 'my-app',
  template: `Original, using interpolation (double curly braces):<b>
        <div>{{ _originalHtmlProperty }}</div> 
  </b><hr>Sanitized, used as innerHTML:<b>
        <div [innerHTML]="sanitizedHtmlProperty"></div>
  </b><hr>Escaped, used as innerHTML:<b>
      <div [innerHTML]="escapedHtmlProperty"></div>
  </b><hr>Escaped AND sanitized used as innerHTML:<b>
      <div [innerHTML]="escapedAndSanitizedHtmlProperty"></div>
  </b>`
})
export class AppComponent {
  _originalHtmlProperty: string = 'AAA<input type="text" name="name">BBB';
  constructor(private _sanitizer: DomSanitizer){ }

  public get sanitizedHtmlProperty() : SafeHtml {
     return this._sanitizer.sanitize(SecurityContext.HTML, this._originalHtmlProperty);
  }

  public get escapedHtmlProperty() : string {
     return this.escapeHtml(this._originalHtmlProperty);
  }

  public get escapedAndSanitizedHtmlProperty() : string {
     return this._sanitizer.sanitize(SecurityContext.HTML, this.escapeHtml(this._originalHtmlProperty));
  }

  escapeHtml(unsafe) {
    return unsafe.replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;")
                 .replace(/"/g, "&quot;").replace(/'/g, "&#039;");
  }
}

HTML escaping function上面使用的转义字符与 angular code does 相同(不幸的是，他们的转义函数不是公开的，所以我们不能使用它)。