在WebChat中，有没有办法检查用户输入文本框是否处于活动状态？

var inputElement = document.getElementById("input-text");

inputElement.addEventListener("focus", function() {
    console.log("文本框处于活动状态");
});

const store = window.WebChat.createStore({}, ({ dispatch }) => next => action => {
    if (action.type === 'DIRECT_LINE/INCOMING_ACTIVITY') {
        const { activity } = action.payload;
        if (activity.type === 'message') {
            const inputIsFocused = activity.channelData && activity.channelData.inputIsFocused;
            console.log("文本框处于活动状态：" + inputIsFocused);
        }
    }
    return next(action);
});

window.WebChat.renderWebChat({
    directLine: window.WebChat.createDirectLine({ token }),
    store
}, document.getElementById('webchat'));