Img src 在 Angular 中不呈现 SVG

Question

我有来自后端的 SVG 文件，当我尝试在前端显示它时 angular(v11) 应用程序它不呈现并且看起来损坏

这是我的代码..

 <div fxLayout="column" *ngFor="let svgFile of activePageDataChunk">
<img src="data:image/svg+xml,svgFile">

这是它的样子

这是svg里面的内容

<svg xmlns="http://www.w3.org/2000/svg" width="420mm" height="297mm">
  <rect width="100%" height="100%" id="paperBorder" fill="#FFF"/>
  <svg id="margins" x="5mm" y="5mm">
    <svg x="38.200050592422485mm" overflow="visible">
      <svg class="level_marker" x="0mm" y="28.509538173675537mm" overflow="visible">
        <text class="level_marker_text" font-size="12" y="-6" x="6mm" text-anchor="start">+0.000</text>
        <line x1="0" y1="0" x2="20mm" y2="0" fill="none" stroke="#231f20" stroke-miterlimit="10"/>
        <line x1="0" y1="0" x2="2.5mm" y2="2.5mm" fill="none" stroke="#231f20" stroke-miterlimit="10"/>
        <line x1="2.5mm" y1="2.5mm" x2="5mm" y2="0mm" fill="none" stroke="#231f20" stroke-miterlimit="10"/>
      </svg>
      <svg class="level_marker" x="0mm" y="-2.490461826324463mm" overflow="visible">
        <text class="level_marker_text" font-size="12" y="-6" x="6mm" text-anchor="start">+3.100</text>
        <line x1="0" y1="0" x2="20mm" y2="0" fill="none" stroke="#231f20" stroke-miterlimit="10"/>
        <line x1="0" y1="0" x2="2.5mm" y2="2.5mm" fill="none" stroke="#231f20" stroke-miterlimit="10"/>
        <line x1="2.5mm" y1="2.5mm" x2="5mm" y2="0mm" fill="none" stroke="#231f20" stroke-miterlimit="10"/>
      </svg>
    </svg>
  </svg>
  <svg x="0mm" y="195mm" width="83mm" height="22mm">
    <rect width="100%" height="100%" fill="none" stroke="#666"/>
    <text x="1mm" y="2.5mm" font-size="2mm" font-family="DINPro-Light, DIN Pro" font-weight="300" style="isolation:isolate"/>
    <text x="1mm" y="7.5mm" font-size="4.5mm" font-family="DINPro, DIN Pro" style="isolation:isolate"/>
  </svg>
  <svg x="0mm" y="247mm" width="27.5mm" height="10mm">
    <rect width="100%" height="100%" fill="none" stroke="#666"/>
    <text x="1mm" y="2.5mm" font-size="2mm" font-family="DINPro-Light, DIN Pro" font-weight="300" style="isolation:isolate">DATE</text>
    <text x="1mm" y="7.5mm" font-size="4.5mm" font-family="DINPro, DIN Pro" style="isolation:isolate">2.6.2022</text>
  </svg>
  <svg x="0mm" y="257mm" width="83mm" height="10mm">
    <rect width="100%" height="100%" fill="none" stroke="#666"/>
    <text x="1mm" y="2.5mm" font-size="2mm" font-family="DINPro-Light, DIN Pro" font-weight="300" style="isolation:isolate">SCALE</text>
    <text x="50%" y="50%" alignment-baseline="central" text-anchor="middle" font-size="4.5mm" font-family="DINPro, DIN Pro" style="isolation:isolate">1:100</text>
  </svg>
  <svg x="0mm" y="277mm" width="83mm" height="10mm">
    <rect width="100%" height="100%" fill="none" stroke="#666"/>
    <text x="1mm" y="2.5mm" font-size="2mm" font-family="DINPro-Light, DIN Pro" font-weight="300" style="isolation:isolate">DRAWN BY</text>
    <text x="1mm" y="7.5mm" font-size="4.5mm" font-family="DINPro, DIN Pro" style="isolation:isolate"/>
  </svg>
</svg>

Answer 1

如评论中所述，提供的数据是一个 SVG 元素，因此您无法将该值绑定到 <img> 元素的 src。

有两种方法可以做到：

将 SVG 元素转换为 base64 字符串，以便您可以使用 <img> 元素。
使用 DOMSanitizer.

回答 1

要将 SVG 文件转换为 base64 字符串，请记下这个问题：

import { DomSanitizer } from '@angular/platform-browser';

constructor(private _sanitizer: DomSanitizer) {}

getSVGImageUrl(image) {
  let base64string = btoa(image);
  return this._sanitizer.bypassSecurityTrustResourceUrl(
    `data:image/svg+xml;base64,${base64string}`
  );
}

<div *ngFor="let svgFile of activePageDataChunk">
  <img [src]="getSVGImageUrl(svgFile)" />
</div>

Sample StackBlitz Demo (Answer 1)

回答2:

import { DomSanitizer } from '@angular/platform-browser';

constructor(private _sanitizer: DomSanitizer) {}

getSVGImage(image) {
  return this._sanitizer.bypassSecurityTrustHtml(`${image}`);
}

<div *ngFor="let svgFile of activePageDataChunk">
  <div [innerHTML]="getSVGImage(svgFile)"></div>
</div>

Sample StackBlitz Demo (Answer 2)

参考

WARNING: sanitizing unsafe style value url（类似问题）

DomSanitizer bypassSecurityTrustResourceUrl()

DomSanitizer bypassSecurityTrustHtml()

Img src 在 Angular 中不呈现 SVG

Img src doesn't render SVG in Angular

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