How do I capture a browser KeyPress event in a Blazor server-side app and perform certain hotkey functions?

To detect a browser keypress event, set the @onkeypress event to the corresponding element. For hotkey functions, you can use the event arguments to check whether the Ctrl, Shift, or Alt key is pressed.

[Index.razor]

@page "/"

<input type="text" @onkeypress="KeyboardEventHandler" />

<h4>@KeyPressed</h4>

@code {
    string KeyPressed = string.Empty;
    bool IsShiftKey;
    private void KeyboardEventHandler(KeyboardEventArgs args)
    {
        if (args.ShiftKey || args.CtrlKey || args.AltKey)
        {
            // Do some hotkey function process here
        }
        else
        {
            KeyPressed = "Key Pressed is " + args.Key;
        }
    }
}

For more information on this topic, check this documentation.