React SVG not rerendering on attribute update

Question

I'm updating an SVG filter attribute via a slider input control but it doesn't continuously update the rendered filter.

Here is the working code: https://codepen.io/dgwyer/pen/EXmqrb

If I use dangerouslySetInnerHTML to set the filter then it works but this hack isn't good enough to use in production code?

class App extends React.Component {
  constructor(props) {
    super(props);
    this.state = { blur: 2 };
    this.blurChange = this.blurChange.bind(this);
  }

  blurChange(event) {
    this.setState({ blur: Number(event.target.value) });
  }

  render() {
    return (
      <div>
        <svg width="0" height="0" viewBox="0 0 0 0">
          <filter id="outline"
            dangerouslySetInnerHTML={{
              __html: `<feGaussianBlur result="blurOut" stdDeviation="${this.state.blur}" />`
            }}
          />
          <filter id="outline1">
            <feGaussianBlur result="blurOut" stdDeviation={this.state.blur} />`
          </filter>            
        </svg>
        <h1 className="fe">Working</h1>
        <div className="control"><input type="range" min="0" max="50" onChange={this.blurChange} value={this.state.blur} /><h3>Blur Slider</h3></div>
        <h1 className="fe1">Not Working</h1>
        <div className="control"><input type="range" min="0" max="50" onChange={this.blurChange} value={this.state.blur} /><h3>Blur Slider</h3></div>
        </div>
    );
  }
}

ReactDOM.render(<App />, document.getElementById("app"));

Is there anyway to update an SVG filter attribute as you normally would with React without using the dangerouslySetInnerHTML hack?

Answer 1

Interesting, apparently the <feGaussianBlur /> has to be re-mounted for changes to apply correctly and React doesn't re-mount it but only updates the stdDeviation attribute. To fix it use key prop additionally on <feGaussianBlur /> so that React re-mounts it each time this.state.blur changes:

<filter id="outline1">
  <feGaussianBlur key={this.state.blur} stdDeviation={this.state.blur} />
</filter>