【发布时间】:2011-06-06 08:29:06
【问题描述】:
如果网页在给定时间段内没有任何活动,我如何自动重新加载网页?
【问题讨论】:
标签: javascript ajax
如果网页在给定时间段内没有任何活动,我如何自动重新加载网页?
【问题讨论】:
标签: javascript ajax
<script type="text/javascript">
var timeout = setTimeout("location.reload(true);",600000);
function resetTimeout() {
clearTimeout(timeout);
timeout = setTimeout("location.reload(true);",600000);
}
</script>
上面将每 10 分钟刷新一次页面,除非调用了 resetTimeout()。例如:
<a href="javascript:;" onclick="resetTimeout();">clicky</a>
【讨论】:
这可以在没有 javascript 的情况下完成,使用这个元标记:
<meta http-equiv="refresh" content="5" >
其中 content ="5" 是页面将等待刷新的秒数。
但你说只有在没有活动的情况下,那是一种什么样的活动?
【讨论】:
setInterval 完成,很高兴知道它的存在!
如果您想在没有活动的情况下刷新页面,那么您需要弄清楚如何定义活动。假设我们每分钟刷新一次页面,除非有人按下键或移动鼠标。这使用 jQuery 进行事件绑定:
<script>
var time = new Date().getTime();
$(document.body).bind("mousemove keypress", function(e) {
time = new Date().getTime();
});
function refresh() {
if(new Date().getTime() - time >= 60000)
window.location.reload(true);
else
setTimeout(refresh, 10000);
}
setTimeout(refresh, 10000);
</script>
【讨论】:
我还构建了一个不需要 jquery 的完整 javascript 解决方案。也许可以把它变成一个插件。我用它来进行流畅的自动刷新,但它看起来可以帮助你。
// Refresh Rate is how often you want to refresh the page
// bassed off the user inactivity.
var refresh_rate = 200; //<-- In seconds, change to your needs
var last_user_action = 0;
var has_focus = false;
var lost_focus_count = 0;
// If the user loses focus on the browser to many times
// we want to refresh anyway even if they are typing.
// This is so we don't get the browser locked into
// a state where the refresh never happens.
var focus_margin = 10;
// Reset the Timer on users last action
function reset() {
last_user_action = 0;
console.log("Reset");
}
function windowHasFocus() {
has_focus = true;
}
function windowLostFocus() {
has_focus = false;
lost_focus_count++;
console.log(lost_focus_count + " <~ Lost Focus");
}
// Count Down that executes ever second
setInterval(function () {
last_user_action++;
refreshCheck();
}, 1000);
// The code that checks if the window needs to reload
function refreshCheck() {
var focus = window.onfocus;
if ((last_user_action >= refresh_rate && !has_focus && document.readyState == "complete") || lost_focus_count > focus_margin) {
window.location.reload(); // If this is called no reset is needed
reset(); // We want to reset just to make sure the location reload is not called.
}
}
window.addEventListener("focus", windowHasFocus, false);
window.addEventListener("blur", windowLostFocus, false);
window.addEventListener("click", reset, false);
window.addEventListener("mousemove", reset, false);
window.addEventListener("keypress", reset, false);
window.addEventListener("scroll", reset, false);
document.addEventListener("touchMove", reset, false);
document.addEventListener("touchEnd", reset, false);
【讨论】:
这个任务很容易在 html 标题部分使用以下代码
<head> <meta http-equiv="refresh" content="30" /> </head>
它会在 30 秒后刷新您的页面。
【讨论】:
是的,亲爱的,那么您必须使用 Ajax 技术。更改内容 特定的html标签:
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<title>Ajax Page</title>
<script>
setInterval(function () { autoloadpage(); }, 30000); // it will call the function autoload() after each 30 seconds.
function autoloadpage() {
$.ajax({
url: "URL of the destination page",
type: "POST",
success: function(data) {
$("div#wrapper").html(data); // here the wrapper is main div
}
});
}
</script>
</head>
<body>
<div id="wrapper">
contents will be changed automatically.
</div>
</body>
</html>
【讨论】:
var bd = document.getElementsByTagName('body')[0];
var time = new Date().getTime();
bd.onmousemove = goLoad;
function goLoad() {
if(new Date().getTime() - time >= 1200000) {
time = new Date().getTime();
window.location.reload(true);
}else{
time = new Date().getTime();
}
}
每次移动鼠标时,它都会检查您上次移动鼠标的时间。如果时间间隔大于 20',它将重新加载页面,否则它将更新您上次移动鼠标的时间。
【讨论】:
我认为activity 是用户是否专注于窗口。例如,当您从一个窗口单击到另一个窗口时(例如,Google Chrome 到 iTunes,或 Internet 浏览器中的 Tab 1 到 Tab 2),网页可以发送回调说“我失焦了!”或“我在焦点!”。人们可以使用 jQuery 来利用这种可能缺乏活动的情况来做他们想做的任何事情。如果我处于你的位置,我会使用以下代码每 5 秒检查一次焦点,等等,如果没有焦点则重新加载。
var window_focus;
$(window).focus(function() {
window_focus = true;
}).blur(function() {
window_focus = false;
});
function checkReload(){
if(!window_focus){
location.reload(); // if not focused, reload
}
}
setInterval(checkReload, 5000); // check if not focused, every 5 seconds
【讨论】:
基于 arturnt 接受的答案。这是一个略微优化的版本,但本质上是相同的:
var time = new Date().getTime();
$(document.body).bind("mousemove keypress", function () {
time = new Date().getTime();
});
setInterval(function() {
if (new Date().getTime() - time >= 60000) {
window.location.reload(true);
}
}, 1000);
唯一不同的是这个版本使用setInterval而不是setTimeout,这样代码更紧凑。
【讨论】:
60000计算,为什么要将间隔设置为1000?
使用您选择的目标自动重新加载。在这种情况下,目标是设置为自身的_self,但您可以通过简单地将window.open('self.location', '_self'); 代码更改为类似此示例window.top.location="window.open('http://www.YourPageAdress.com', '_self'"; 的内容来更改重新加载页面。
带有确认 ALERT 消息:
<script language="JavaScript">
function set_interval() {
//the interval 'timer' is set as soon as the page loads
var timeoutMins = 1000 * 1 * 15; // 15 seconds
var timeout1Mins = 1000 * 1 * 13; // 13 seconds
itimer=setInterval("auto_logout()",timeoutMins);
atimer=setInterval("alert_idle()",timeout1Mins);
}
function reset_interval() {
var timeoutMins = 1000 * 1 * 15; // 15 seconds
var timeout1Mins = 1000 * 1 * 13; // 13 seconds
//resets the timer. The timer is reset on each of the below events:
// 1. mousemove 2. mouseclick 3. key press 4. scrolling
//first step: clear the existing timer
clearInterval(itimer);
clearInterval(atimer);
//second step: implement the timer again
itimer=setInterval("auto_logout()",timeoutMins);
atimer=setInterval("alert_idle()",timeout1Mins);
}
function alert_idle() {
var answer = confirm("Session About To Timeout\n\n You will be automatically logged out.\n Confirm to remain logged in.")
if (answer){
reset_interval();
}
else{
auto_logout();
}
}
function auto_logout() {
//this function will redirect the user to the logout script
window.open('self.location', '_self');
}
</script>
无确认提醒:
<script language="JavaScript">
function set_interval() {
//the interval 'timer' is set as soon as the page loads
var timeoutMins = 1000 * 1 * 15; // 15 seconds
var timeout1Mins = 1000 * 1 * 13; // 13 seconds
itimer=setInterval("auto_logout()",timeoutMins);
}
function reset_interval() {
var timeoutMins = 1000 * 1 * 15; // 15 seconds
var timeout1Mins = 1000 * 1 * 13; // 13 seconds
//resets the timer. The timer is reset on each of the below events:
// 1. mousemove 2. mouseclick 3. key press 4. scrolling
//first step: clear the existing timer
clearInterval(itimer);
clearInterval(atimer);
//second step: implement the timer again
itimer=setInterval("auto_logout()",timeoutMins);
}
function auto_logout() {
//this function will redirect the user to the logout script
window.open('self.location', '_self');
}
</script>
两种解决方案的正文代码相同:
<body onLoad="set_interval(); document.form1.exp_dat.focus();" onKeyPress="reset_interval();" onmousemove="reset_interval();" onclick="reset_interval();" onscroll="reset_interval();">
【讨论】:
使用页面确认文本而不是警报
由于这是另一种在不活动时自动加载的方法,我给它第二个答案。这个更简单,更容易理解。
页面上有重新加载确认
<script language="javaScript" type="text/javascript">
<!--
var autoCloseTimer;
var timeoutObject;
var timePeriod = 5100; // 5,1 seconds
var warnPeriod = 5000; // 5 seconds
// Warning period should always be a bit shorter then time period
function promptForClose() {
autoCloseDiv.style.display = 'block';
autoCloseTimer = setTimeout("definitelyClose()", warnPeriod);
}
function autoClose() {
autoCloseDiv.style.display = 'block'; //shows message on page
autoCloseTimer = setTimeout("definitelyClose()", timePeriod); //starts countdown to closure
}
function cancelClose() {
clearTimeout(autoCloseTimer); //stops auto-close timer
autoCloseDiv.style.display = 'none'; //hides message
}
function resetTimeout() {
clearTimeout(timeoutObject); //stops timer
timeoutObject = setTimeout("promptForClose()", timePeriod); //restarts timer from 0
}
function definitelyClose() {
// If you use want targeted reload: parent.Iframe0.location.href = "https://URLHERE.com/"
// or this: window.open('http://www.YourPageAdress.com', '_self');
// of for the same page reload use: window.top.location=self.location;
// or window.open(self.location;, '_self');
window.top.location=self.location;
}
-->
</script>
与页面确认一起使用时的确认框
<div class="leftcolNon">
<div id='autoCloseDiv' style="display:none">
<center>
<b>Inactivity warning!</b><br />
This page will Reloads automatically unless you hit 'Cancel.'</p>
<input type='button' value='Load' onclick='definitelyClose();' />
<input type='button' value='Cancel' onclick='cancelClose();' />
</center>
</div>
</div>
两者的正文代码相同
<body onmousedown="resetTimeout();" onmouseup="resetTimeout();" onmousemove="resetTimeout();" onkeydown="resetTimeout();" onload="timeoutObject=setTimeout('promptForClose()',timePeriod);">
注意:如果您不想在页面上进行确认,请使用无需确认
<script language="javaScript" type="text/javascript">
<!--
var autoCloseTimer;
var timeoutObject;
var timePeriod = 5000; // 5 seconds
function resetTimeout() {
clearTimeout(timeoutObject); //stops timer
timeoutObject = setTimeout("definitelyClose()", timePeriod); //restarts timer from 0
}
function definitelyClose() {
// If you use want targeted reload: parent.Iframe0.location.href = "https://URLHERE.com/"
// or this: window.open('http://www.YourPageAdress.com', '_self');
// of for the same page reload use: window.top.location=self.location;
// or window.open(self.location;, '_self');
window.top.location=self.location;
}
-->
</script>
【讨论】:
最后是最简单的解决方案:
带有警报确认:
<script type="text/javascript">
// Set timeout variables.
var timoutWarning = 3000; // Display warning in 1Mins.
var timoutNow = 4000; // Timeout in 2 mins.
var warningTimer;
var timeoutTimer;
// Start timers.
function StartTimers() {
warningTimer = setTimeout("IdleWarning()", timoutWarning);
timeoutTimer = setTimeout("IdleTimeout()", timoutNow);
}
// Reset timers.
function ResetTimers() {
clearTimeout(warningTimer);
clearTimeout(timeoutTimer);
StartTimers();
$("#timeout").dialog('close');
}
// Show idle timeout warning dialog.
function IdleWarning() {
var answer = confirm("Session About To Timeout\n\n You will be automatically logged out.\n Confirm to remain logged in.")
if (answer){
ResetTimers();
}
else{
IdleTimeout();
}
}
// Logout the user and auto reload or use this window.open('http://www.YourPageAdress.com', '_self'); to auto load a page.
function IdleTimeout() {
window.open(self.location,'_top');
}
</script>
没有警报确认:
<script type="text/javascript">
// Set timeout variables.
var timoutWarning = 3000; // Display warning in 1Mins.
var timoutNow = 4000; // Timeout in 2 mins.
var warningTimer;
var timeoutTimer;
// Start timers.
function StartTimers() {
warningTimer = setTimeout(timoutWarning);
timeoutTimer = setTimeout("IdleTimeout()", timoutNow);
}
// Reset timers.
function ResetTimers() {
clearTimeout(warningTimer);
clearTimeout(timeoutTimer);
StartTimers();
$("#timeout").dialog('close');
}
// Logout the user and auto reload or use this window.open('http://www.YourPageAdress.com', '_self'); to auto load a page.
function IdleTimeout() {
window.open(self.location,'_top');
}
</script>
两种解决方案的正文代码相同
<body onload="StartTimers();" onmousemove="ResetTimers();" onKeyPress="ResetTimers();">
【讨论】:
使用 JavaScript setInterval 方法:
setInterval(function(){ location.reload(); }, 3000);
【讨论】:
使用LocalStorage来跟踪上次activity的时间,我们可以写reload函数如下
function reloadPage(expiryDurationMins) {
const lastInteraction = window.localStorage.getItem('lastinteraction')
if (!lastInteraction) return // no interaction recorded since page load
const inactiveDurationMins = (Date.now() - Number(lastInteraction)) / 60000
const pageExpired = inactiveDurationMins >= expiryDurationMins
if (pageExpired) window.location.reload()
}
然后我们创建一个箭头函数,以毫秒为单位保存最后一次交互时间(字符串)
const saveLastInteraction = () => window.localStorage.setItem('last', Date.now().toString())
我们需要在浏览器中监听beforeunload 事件来清除我们的lastinteraction 记录,这样我们就不会陷入无限的重新加载循环。
window.addEventListener('beforeunload', () => window.localStorage.removeItem('lastinteraction'))
我们需要监控的用户活动事件是mousemove 和keypress。我们存储用户移动鼠标或按下键盘上的键时的最后一次交互时间
window.addEventListener('mousemove', saveLastInteraction)
window.addEventListener('keypress', saveLastInteraction)
为了设置我们的最终监听器,我们将使用load 事件。
在页面加载时,我们使用setInterval 函数来检查页面是否在一段时间后过期。
const expiryDurationMins = 1
window.addEventListener('load', setInterval.bind(null, reloadPage.bind(null, expiryDurationMins), 1000))
【讨论】:
我是这样做的:
let lastActionTaken = new Date().getTime();
function checkLastAction() {
let now = new Date().getTime();
if (now - lastActionTaken > 1000 * 60 * 60) window.location.reload();
else lastActionTaken = now;
}
window.addEventListener("mousemove", checkLastAction);
window.addEventListener("touchstart", checkLastAction);
window.addEventListener("keydown", checkLastAction);
一旦用户移动鼠标、按键或触摸触摸屏(如果该页面已闲置 1 小时),这将重新加载页面。此外,这也处理了focus,所以如果用户在不同的程序中移动他们的鼠标然后回到这个window,它将重新加载,这很好,因为关键是没有旧数据正在显示。
【讨论】:
许多其他答案要么没有回答“没有活动”的问题的主要部分,要么它们非常复杂,不必要。我已经接受了答案(这里:https://stackoverflow.com/a/4644315/9008140) 并修改它以利用您可以将计时器分配给变量的事实。这使我们可以摆脱第二个计时器以及时间戳。
/**
* create a timer that refreshes the page after the number of
minutes has passed without user interaction.
* Moving the mouse or pressing a key on the current page will start
the timer over.
* @param {any} minutes
*/
var refreshTimer;
function setPageRefreshTimer(minutes) {
var refreshInterval = minutes * 60 * 1000; //interval is in milliseconds. We refresh every x minutes.
$(document.body).bind("mousemove keypress", function (e) {
if (refreshTimer != null && refreshTimer != undefined) {
window.clearTimeout(refreshTimer);
}
refreshTimer = window.setTimeout(function () { window.location.reload(true); }, refreshInterval);
});
refreshTimer = window.setTimeout(function () { window.location.reload(true); }, refreshInterval);
}
此示例代码将根据传入的参数在几分钟内刷新,其准确性与 javascript 计时器一样高。在测试中,总是不到一秒。我将其创建为一个函数,但如果您愿意,您可以将其拉入您的页面。
【讨论】: