Add an event handler for the ScriptDialogOpening event.
ScriptDialogOpening runs when a JavaScript dialog (alert, confirm,
prompt, or beforeunload) displays for the webview. This event only
triggers if the ICoreWebView2Settings::AreDefaultScriptDialogsEnabled
property is set to FALSE. The ScriptDialogOpening event suppresses
dialogs or replaces default dialogs with custom dialogs.
If a deferral is not taken on the event args, the subsequent scripts are
blocked until the event handler returns. If a deferral is taken, the
scripts are blocked until the deferral is completed.
The D Programming Language's Unofficial Docs
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Add an event handler for the ScriptDialogOpening event. ScriptDialogOpening runs when a JavaScript dialog (alert, confirm, prompt, or beforeunload) displays for the webview. This event only triggers if the ICoreWebView2Settings::AreDefaultScriptDialogsEnabled property is set to FALSE. The ScriptDialogOpening event suppresses dialogs or replaces default dialogs with custom dialogs.
If a deferral is not taken on the event args, the subsequent scripts are blocked until the event handler returns. If a deferral is taken, the scripts are blocked until the deferral is completed.
\snippet SettingsComponent.cpp ScriptDialogOpening