我的共享 _Layout.cshtml 中有一个 jquery 脚本，它记录最后一次点击并在特定时间间隔后注销用户。出现的问题是，当打开超过 1 个页面时（即在浏览器的多个选项卡中，打开同一个应用程序的不同页面），如果任何页面在指定时间内保持空闲，它就会注销用户。以及用户当前正在处理的另一个页面，当用户单击时，它会引发异常（这很明显，因为用户已被其他页面注销）。我不能使用sessions 相关的东西。无论如何，我可以在浏览器的不同打开选项卡中维护此类变量的范围吗？如果用户正在处理任何打开的选项卡，我想将其他打开的选项卡的计时器重置为零。我试着先四处寻找答案，但我发现每个问题都与我的场景不同。
（我使用的是 MVC 4。Jquery 脚本位于 /Shared/_Layout.cshtml）
【问题讨论】：
标签： jquery asp.net-mvc-4 razor timeout
我使用一些名为store.js 的库解决了这个问题。它不需要轮询服务器和其他东西，相反，只要在任何打开的选项卡上设置 cookie，就会立即在选项卡之间共享 cookie（不需要刷新选项卡；这通常是为了获取cookie，在其他选项卡上设置。）。最重要的是，我喜欢的是store.js 在可用时使用localStorage，并在IE6 和IE7 中使用userData 行为。没有闪光灯来减慢您的页面加载速度。没有 cookie 来增加您的网络请求。 store.js 依赖 JSON 序列化到磁盘。使用起来非常简单。
使用示例：
store.set('username', 'joe')
document.write('username: ' + store.get('username') + '<br />')
store.remove('username')
store.clear()
store.set('user', { name: 'joe', likes: 'javascript' })
var user = store.get('user')
document.write(user.name + ' likes ' + user.likes)
【讨论】：
空闲计时器可以使用 localStorage 跨多个窗口和选项卡进行通信（保持同步）。在 github 上，marcuswestin/store.js 为多种浏览器提供了良好的功能。这是提供同步窗口/选项卡/iframe 的 idletimer 插件的“测试”代码，前提是它们都在同一个域中。 https://github.com/JillElaine/jquery-idleTimeout
/**
* This work is licensed under the MIT License
*
* Configurable idle (no activity) timer and logout redirect for jQuery.
* Works across multiple windows, tabs and iframes from the same domain.
*
* Dependencies: JQuery v1.7+, JQuery UI, store.js from https://github.com/marcuswestin/store.js - v1.3.4+
*
* Commented and console logged for debugging with Firefox & Firebug or similar
* version 1.0.6
**/
/*global jQuery: false, document: false, store: false, clearInterval: false, setInterval: false, setTimeout: false, window: false, alert: false, console: false*/
/*jslint indent: 2, sloppy: true, plusplus: true*/
(function ($) {
$.fn.idleTimeout = function (options) {
console.log('start');
//##############################
//## Configuration Variables
//##############################
var defaults = {
idleTimeLimit: 30000, // 30 seconds for testing. 'No activity' time limit in milliseconds. 1200000 = 20 Minutes
dialogDisplayLimit: 20000, // 20 seconds for testing. Time to display the warning dialog before redirect (and optional callback) in milliseconds. 180000 = 3 Minutes
redirectUrl: '/logout', // redirect to this url on timeout logout. Set to "redirectUrl: false" to disable redirect
// optional custom callback to perform before redirect
customCallback: false, // set to false for no customCallback
// customCallback: function () { // define optional custom js function
// perform custom action before logout
// },
// configure which activity events to detect
// http://www.quirksmode.org/dom/events/
// https://developer.mozilla.org/en-US/docs/Web/Reference/Events
activityEvents: 'click keypress scroll wheel mousewheel', // separate each event with a space
//dialog box configuration
dialogTitle: 'Session Expiration Warning',
dialogText: 'Because you have been inactive, your session is about to expire.',
// server-side session keep-alive timer
sessionKeepAliveTimer: 600000 // Ping the server at this interval in milliseconds. 600000 = 10 Minutes
// sessionKeepAliveTimer: false // Set to false to disable pings
},
//##############################
//## Private Variables
//##############################
opts = $.extend(defaults, options),
checkHeartbeat = 2000, // frequency to check for timeouts - 2000 = 2 seconds
origTitle = document.title, // save original browser title
sessionKeepAliveUrl = window.location.href, // set URL to ping to user's current window
keepSessionAlive, activityDetector,
idleTimer, remainingTimer, checkIdleTimeout, idleTimerLastActivity, startIdleTimer, stopIdleTimer,
openWarningDialog, dialogTimer, checkDialogTimeout, startDialogTimer, stopDialogTimer, isDialogOpen, destroyWarningDialog,
countdownDisplay, logoutUser,
checkForIframes, includeIframes, attachEventIframe; // iframe functionality
//##############################
//## Private Functions
//##############################
keepSessionAlive = function () {
if (opts.sessionKeepAliveTimer) {
var keepSession = function () {
if (idleTimerLastActivity === store.get('idleTimerLastActivity')) {
console.log('keep session alive function');
$.get(sessionKeepAliveUrl);
}
};
setInterval(keepSession, opts.sessionKeepAliveTimer);
}
};
activityDetector = function () {
$('body').on(opts.activityEvents, function () {
if (isDialogOpen() !== true) {
console.log('activity detected');
startIdleTimer();
} else {
console.log('dialog open. activity ignored');
}
});
};
checkIdleTimeout = function () {
var timeNow = $.now(), timeIdleTimeout = (store.get('idleTimerLastActivity') + opts.idleTimeLimit);
if (timeNow > timeIdleTimeout) {
console.log('timeNow: ' + timeNow + ' > idle ' + timeIdleTimeout);
if (isDialogOpen() !== true) {
console.log('dialog is not open & will be opened');
openWarningDialog();
startDialogTimer();
}
} else if (store.get('idleTimerLoggedOut') === true) { //a 'manual' user logout?
logoutUser();
} else {
console.log('idle not yet timed out');
if (isDialogOpen() === true) {
console.log('dialog is open & will be closed');
destroyWarningDialog();
stopDialogTimer();
}
}
};
startIdleTimer = function () {
stopIdleTimer();
idleTimerLastActivity = $.now();
store.set('idleTimerLastActivity', idleTimerLastActivity);
console.log('start idle timer: ' + idleTimerLastActivity);
idleTimer = setInterval(checkIdleTimeout, checkHeartbeat);
};
stopIdleTimer = function () {
clearInterval(idleTimer);
};
openWarningDialog = function () {
var dialogContent = "<div id='idletimer_warning_dialog'><p>" + opts.dialogText + "</p><p style='display:inline'>Time remaining: <div style='display:inline' id='countdownDisplay'></div></p></div>";
$(dialogContent).dialog({
buttons: {
"Stay Logged In": function () {
console.log('Stay Logged In button clicked');
destroyWarningDialog();
stopDialogTimer();
startIdleTimer();
},
"Log Out Now": function () {
console.log('Log Out Now button clicked');
logoutUser();
}
},
closeOnEscape: false,
modal: true,
title: opts.dialogTitle
});
// hide the dialog's upper right corner "x" close button
$('.ui-dialog-titlebar-close').css('display', 'none');
// start the countdown display
countdownDisplay();
// change title bar to warning message
document.title = opts.dialogTitle;
};
checkDialogTimeout = function () {
var timeNow = $.now(), timeDialogTimeout = (store.get('idleTimerLastActivity') + opts.idleTimeLimit + opts.dialogDisplayLimit);
if ((timeNow > timeDialogTimeout) || (store.get('idleTimerLoggedOut') === true)) {
console.log('timeNow: ' + timeNow + ' > dialog' + timeDialogTimeout);
logoutUser();
} else {
console.log('dialog not yet timed out');
}
};
startDialogTimer = function () {
dialogTimer = setInterval(checkDialogTimeout, checkHeartbeat);
};
stopDialogTimer = function () {
clearInterval(dialogTimer);
clearInterval(remainingTimer);
};
isDialogOpen = function () {
var dialogOpen = $("#idletimer_warning_dialog").is(":visible");
if (dialogOpen === true) {
return true;
}
return false;
};
destroyWarningDialog = function () {
console.log('dialog destroyed');
$(".ui-dialog-content").dialog('destroy').remove();
document.title = origTitle;
};
// display remaining time on warning dialog
countdownDisplay = function () {
var dialogDisplaySeconds = opts.dialogDisplayLimit / 1000, mins, secs;
remainingTimer = setInterval(function () {
mins = Math.floor(dialogDisplaySeconds / 60); // minutes
if (mins < 10) { mins = '0' + mins; }
secs = dialogDisplaySeconds - (mins * 60); // seconds
if (secs < 10) { secs = '0' + secs; }
$('#countdownDisplay').html(mins + ':' + secs);
dialogDisplaySeconds -= 1;
}, 1000);
};
logoutUser = function () {
console.log('logout function');
store.set('idleTimerLoggedOut', true);
if (opts.customCallback) {
console.log('logout function custom callback');
opts.customCallback();
}
if (opts.redirectUrl) {
console.log('logout function redirect to URL');
window.location.href = opts.redirectUrl;
}
};
// document must be in readyState 'complete' before looking for iframes
checkForIframes = function () {
var docReadyCheck, isDocReady;
docReadyCheck = function () {
if (document.readyState === "complete") {
console.log('check for iframes, now that the document is complete');
clearInterval(isDocReady);
includeIframes();
}
};
isDocReady = setInterval(docReadyCheck, 1000);
};
// look for iframes
includeIframes = function () {
console.log('include iframes start');
var foundIframes = document.getElementsByTagName('iframe'), index, iframeItem;
if (foundIframes.length > 0) { //at least one iframe found
console.log('iframes found: ' + foundIframes.length);
// attach events to each iframe found
for (index = 0; index < foundIframes.length; index++) {
iframeItem = foundIframes.item(index);
if (iframeItem.attachEvent) { // IE < 11. Returns a boolean true/false
console.log('attach event to iframe. Browser IE < 11');
iframeItem.attachEvent('onload', attachEventIframe(index));
} else { // IE >= 11 and FF, etc.
console.log('attach event to iframe. Browser NOT IE < 11');
iframeItem.addEventListener('load', attachEventIframe(index), false);
}
} // end for loop
} // end if any iframes
};
// attach events to each iframe
attachEventIframe = function (index) {
var iframe = $('iframe:eq(' + index + ')').contents().find('html');
iframe.on(opts.activityEvents, function (event) {
console.log('bubbling iframe activity event to body of page');
$('body').trigger(event);
});
};
//###############################
// Build & Return the instance of the item as a plugin
// This is your construct.
//###############################
return this.each(function () {
if (store.enabled) {
idleTimerLastActivity = $.now();
store.set('idleTimerLastActivity', idleTimerLastActivity);
store.set('idleTimerLoggedOut', false);
} else {
alert('Please disable "Private Mode", or upgrade to a modern browser. Or perhaps a dependent file missing. Please see: https://github.com/marcuswestin/store.js');
}
activityDetector();
keepSessionAlive();
startIdleTimer();
checkForIframes();
});
};
}(jQuery));
【讨论】：