Angular 5 - sanitizing HTML with pipe

Question

When i got the warning:

"WARNING: sanitizing HTML stripped some content"

I did some research and saw people using the pipe below or a pipe that looks like the one below

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

@Pipe({ name: 'sanitizeHtml' })
export class SanitizeHtmlPipe implements PipeTransform {

    constructor(private _sanitizer: DomSanitizer) { }

    transform(v: string): SafeHtml {
        return this._sanitizer.bypassSecurityTrustHtml(v);
    }
}

Unfortunately I still get the same error even when i implement the pipe like this:

<span [innerHTML]="specialist.blocks[0].paragraph.html | sanitizeHtml"></span>
<p [innerHTML]="package.fields.remarks | sanitizeHtml"></p>
<li [innerHTML]="package.fields.name | sanitizeHtml"></li>

So I'm wondering if I implemented the pipe wrong or is there something else why it doesn't work?

Edit:

example of specialist.blocks[0].paragraph.html:

"< div id="test" class="test"> \n< h3>NAME SPECIALIST< /h3>\n< p>random text< /p>< /div>\n< /div>"

example of package.fields.remarks:

"Arrangement: 3 nachten incl. ontbijt en 2 greenfees p.p. met keuze uit North en South< br>\n- gratis dagelijkse toegang tot de spa (1 uur Hamman, sauna, zwembad, hydromassage)"

example of package.fields.name:

"Shortbreak 3 nachten< br>2 pers./Superior Double/LO, incl. golf"

Getting the warnings in firefox and chrome

what is the value of `package.fields.remarks` ? can you share in this question — Chandru, Nov 28 '17 at 09:52
i have updated my answer can you check this ?. the problem is in the open html tag with space so i just removed the space using pipe it will be working for me — Chandru, Nov 28 '17 at 10:48
should have probably said that i put the spaces in there so i could show you what is in the value because it would use the tags in the question xD — Djkobus, Nov 28 '17 at 10:54
check the stackblitz link following its working for me https://stackblitz.com/edit/angular-vjt27k?file=app%2Fapp.component.html — Chandru, Nov 28 '17 at 11:01
Here is a gist https://gist.github.com/MurhafSousli/3d2ddb777c8ce88e2400bd93f694cd3b — Murhaf Sousli, Sep 26 '18 at 15:54

score 7 · Answer 1 · edited Jul 12 '20 at 22:53

As below example if you trying print {} in html angular treats it as expression and will give errors so you can got below options, We have 2 options for HTML sanitization,

Using Pipe

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

@Pipe({ name: 'sanitizeHtml' })
export class SanitizeHtmlPipe implements PipeTransform {

  constructor(private _sanitizer: DomSanitizer) { }

  transform(value: string): SafeHtml {
    return this._sanitizer.bypassSecurityTrustHtml(value);
  }

}

In Component you can use it as {{variable | santizeHtml }}

Using Component, as an property binding like below, Declare html in .ts file

const allowedChars = '@ # $ % ^ & * ( ) _ - ., ? < > { } [ ] ! +';

and use it in template as,

<span [innerHTML]="allowedChars"></span>

score 3 · Answer 2 · edited Jul 13 '20 at 06:22

3

Demo : https://stackblitz.com/edit/angular-vjt27k?file=app%2Fsanitize-html.pipe.ts

pipe.ts

import { Pipe, PipeTransform } from '@angular/core';

@Pipe({ name: 'sanitizeHtml'})
export class sanitizeHtmlPipe implements PipeTransform  {
    transform(value) {
        return value.split('< ').join('<');
    }
}

edited Jul 13 '20 at 06:22

Jago

2,751
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answered Nov 28 '17 at 10:34

Chandru

10,864
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53

score -2 · Answer 3 · answered Jul 18 '21 at 10:02

All is good but your HTML is not perfect. so you need to remove space from html tags.
Your JSON something should be like this

JSON:


      specialist: any = {
        "blocks": [
          {
            "paragraph": {
              "html": '<div id="test" class="test">\n<h3>NAME SPECIALIST</h3>\n<p>random text</p> <div>\n</div>'
            }
          }
        ]
      }
      package: any = {
        "fields": {
          "remarks": 'Arrangement: 3 nachten incl. ontbijt en 2 greenfees p.p. met keuze uit North en South<br>\n- gratis dagelijkse toegang tot de spa (1 uur Hamman, sauna, zwembad, hydromassage)',
          "name": 'Shortbreak 3 nachten<br>2 pers./Superior Double/LO, incl. golf'
        }
      }

HTML:


    <span [innerHTML]="specialist.blocks[0].paragraph.html | sanitizeHtml"></span>
    <p [innerHTML]="package.fields.remarks | sanitizeHtml"></p>
    <li [innerHTML]="package.fields.name | sanitizeHtml"></li>

Sanitize Pipe TS:


    import { Pipe, PipeTransform } from '@angular/core';
    import { DomSanitizer, SafeHtml } from '@angular/platform-browser';
    
    @Pipe({ name: 'sanitizeHtml' })
    export class SanitizeHtmlPipe implements PipeTransform {
    
        constructor(private _sanitizer: DomSanitizer) { }
    
        transform(v: any): any {
            return this._sanitizer.bypassSecurityTrustHtml(v);
        }
    }

Output:

Browser Output Log View

For full HTML Sanitizing import setup process see this post

Angular 5 - sanitizing HTML with pipe

3 Answers3

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