Why the HighContrastChanged Event does not work in my js code?

Xin Xin4 Su 1

I need get the system high contrast changed, so I monitor the "HighContrastChanged" event, but it can not work, but it is normal in C#.

below is my code sample,
accessbilitySettings= Windows.UI.ViewManagement.AccessibilitySettings();

accessbilitySettings.addEventListener("highcontrastchanged", this.onHighContrastChanged);

onHighContrastChanged() {
console.log(onHighContrastChanged);
}

the onHighContrastChanged() can not be fired when the system high contrast changed

Rita Han - MSFT 2,161 Reputation points

2020-09-24T01:48:40.817+00:00

@Xin Xin4 Su What's your application type? UWP or others?
Xin Xin4 Su 1 Reputation point

2020-09-24T03:27:58.38+00:00

@Richard Zhang-MSFT
A webview is embedded in UWP, and the webview is implemented by angular, I monitor the highContrastChanged event in angular ngOnInit()
Richard Zhang-MSFT 6,936 Reputation points

2020-09-24T06:43:06.863+00:00

Hello, if your question is based on Angular, the Q&A platform currently does not support this topic, you can ask in Angular related forums.