在屏幕阅读器上工作的空闲超时警告模式

Question

我需要帮助一个在用户空闲时触发的模态.它运行良好,直到我在运行NVDA的Firefox上进行测试.使用箭头键时以及在移动设备上滑动时会出现焦点问题.当模态出现并且用户使用箭头或滑动时,如果我等待点击它,焦点将在几秒后从"是"按钮反弹到标题.我已经装了工作示例:https://jsfiddle.net/ncanqaam/

我将空闲时间段更改为一分钟,并删除了调用服务器以扩展用户会话的部分.

var state ="L";
var timeoutPeriod = 540000;
var oneMinute = 60000;
var sevenMinutes = 60000;

var lastActivity = new Date();

function getIdleTime() {
    return new Date().getTime() - lastActivity.getTime();
}

//Add Movement Detection
function addMovementListener() {
    $(document).on('mousemove',  onMovementHandler);
    $(document).on('keypress',  onMovementHandler);
    $(document).on('touchstart touchend',  onMovementHandler);
}
//Remove Movement Detection
function removeMovementListener() {
    $(document).off('mousemove', onMovementHandler);
    $(document).off('keypress',  onMovementHandler);
    $(document).off('touchstart touchend',  onMovementHandler);
}

//Create Movement Handler
function onMovementHandler(ev) {
    lastActivity = new Date();
    console.log("Something moved, idle time = " + lastActivity.getTime());
}

function hide() {
    $('#overlayTY').removeClass('opened'); // remove the overlay in order to  make the main screen available again
    $('#overlayTY, #modal-session-timeout').css('display', 'none'); // hide the modal window
    $('#modal-session-timeout').attr('aria-hidden', 'true'); // mark the modal window as hidden
    $('#modal-session-timeout').removeAttr('aria-hidden'); // mark the main page as visible
}

if (state == "L") {
    $(document).ready(function() {
        //Call Event Listerner to for movement detection
        addMovementListener();
        setInterval(checkIdleTime, 5000);
    });

    function endSession() {
        console.log('Goodbye!');
    }

    var modalActive = false;
    function checkIdleTime() {
        var idleTime = getIdleTime();
        console.log("The total idle time is " + idleTime / oneMinute + " minutes.");

        if (idleTime > sevenMinutes) {
            var prevFocus = $(document.activeElement);
            console.log('previously: ' + prevFocus);
            var modal = new window.AccessibleModal({
                mainPage: $('#oc-container'),
                overlay: $('#overlayTY').css('display', 'block'),
                modal: $('#modal-session-timeout')
            });

            if (modalActive === false) {
                console.log(modalActive);
                $('#modal-session-timeout').insertBefore('#oc-container');
                $('#overlayTY').insertBefore('#modal-session-timeout');
                modal.show();
                $('#modal-overlay').removeClass('opened');
                modalActive = true;
                console.log(modalActive);
                console.log('the modal is active');
                $('.js-timeout-refresh').on('click touchstart touchend', function(){
                    hide();
                    modalActive = false;
                    prevFocus.focus();
                    addMovementListener();
                    lastActivity = new Date();
                });

                $('.js-timeout-session-end').on('click touchstart touchend', function(){
                    hide();
                    $('#overlayTY').css('display', 'none');
                    endSession();
                });
            }   
        }
        if ($('#overlayTY').css('display') === 'block'){
            removeMovementListener();
        }

        if (idleTime > timeoutPeriod) {
            endSession();
        }
    }
}

Answer 1

问题在于 Voiceover Safari，当用户在锚点或按钮上滑动时，焦点会设置在这些元素上；但是，如果该元素是 H2，它将不会接收焦点，因为它本身不应该接收任何焦点。为了弥补这一点，我尝试在 H2 上设置手势事件，但是 Voiceover Safari 需要时间来读取元素文本或标签输出，因此它会阻止任何事件触发，这会在尝试将焦点设置在从加载的模态上时产生问题超时功能而不是可点击元素。希望苹果将来能解决这个问题。