grid-options.js

let gridOptions = {
    suppressKeyboardEvent: function(params) {
        const KEY_LEFT = 37;
        const KEY_UP = 38;
        const KEY_RIGHT = 39;
        const KEY_DOWN = 40;
        
        const event = params.event;
        const key = event.which;

        const keysToSuppress = [KEY_LEFT, KEY_UP, KEY_RIGHT, KEY_DOWN];
        const suppress = keysToSuppress.indexOf(key) >= 0;

        return suppress;
    },
    ...
};