setinterval | 易学教程

Can't cancel repeat timer in GWT

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问题 I am trying to schedule a repeating timer in GWT, it will run every one milli second, poll for a certain event, if it is found satisfactory, do something and cancel the timer. I tried doing this: final Timer t = new Timer() { public void run() { if (..condition is true, exit) { t.cancel(); doSomething(); } } } t.scheduleRepeating(1); However, I get an error message like the local variable t may not have been initialized . I am putting tis piece of code in the onSuccess clause of a

Javascript Function setInterval() works only one time

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问题 Guys! I wanna ask about Javascript function setInterval(). My problem is that setInterval() works only one time, not repeating. Here is my HTML Code <button id = 'btun' name = 'btun' onclick = 'changecolor();' class = 'btn btn-success btn-block'>Color Change</button> and Javascript Code function below(t){ var button = document.getElementById('btun'); var quadrant = (t*t + 2*t + 1)+"px"; console.log('ye'); button.style.marginTop = quadrant; document.write(pix); } var doBelow = setInterval

“$apply already in progress” when opening confirm dialog box with Firefox

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问题 I am (sometimes) getting a weird $apply already in progress error when opening a confirm dialog box in the following and innocent looking situation : var mod = angular.module('app', []); mod.controller('ctrl', function($scope, $interval, $http) { $scope.started = false; $scope.counter = 0; // some business function that is called repeatedly // (here: a simple counter increase) $interval(function() { $scope.counter++; }, 1000); // this function starts some service on the backend $scope.start =

How to make a phonegap build app work in background

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问题 I need my app to work 24/7 recording the users location every 5 mins. It works fine while the phone is active but when it isn't the setInterval() 's strecth out to be up to 5x longer than they should. Using phonegap build, how would I go about making the app work as it should in the background while the phone is idle? 回答1: @Marty, both Android and iOS and run in the background, but require an extension to the regular config.xml. To be clear Android apps uses AndriodManifest.xml. iOS uses,

Stop simple JavaScript slideshow after one loop

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问题 I know very little about JavaScript at all, but I'm looking for a solution to a simple code that I'd like to use. I'm not trying to execute any slides or fades, just a simple slideshow that switches from one image to the next. I want the slideshow to play through just once, and then stop on the last image in the sequence. Any help would be greatly appreciated! $("#slideshow > div:gt(0)").hide(); setInterval(function() { $('#slideshow > div:first') .next() .end() .appendTo('#slideshow'); },

setTimeout appears to execute too fast

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问题 I've been fiddling around with setTimeout and setInterval, and I cannot get the code to execute the way I would like it to. My goal is to create a setInterval, which calls once every three seconds, and have it clear after ten seconds. However, when I run the code in firebug, the only thing I get is a number, which I assume is the id of setInterval because every time I execute the code, the number increases. var intID = setInterval(function() { console.log("I've been called");},3000);

Is there a maximum delay limit for window.setInterval

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问题 Today I encountered an interesting problem with window.setInterval. When used with a sufficiently large delay (in this case the number of milliseconds in 30 days) it executes every second instead of every 30 days. Tested in latest Chrome and Firefox. jsFiddle link window.setInterval(function() { document.getElementById("first").innerHTML = new Date().toString(); }, 5000); window.setInterval(function() { document.getElementById("second").innerHTML = new Date().toString(); }, 2592000000); I

停止JavaScript中的setInterval调用

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我正在使用 setInterval (fname, 10000); 在 JavaScript 中每10秒调用一次函数。是否可以在某个事件中停止调用它？我希望用户能够停止重复刷新数据。 #1楼 setInterval() 返回一个间隔ID，您可以将其传递给 clearInterval() ： var refreshIntervalId = setInterval(fname, 10000); /* later */ clearInterval(refreshIntervalId); 有关 setInterval() 和 clearInterval() 请参阅文档。 #2楼如果将 setInterval 的返回值设置为变量，则可以使用 clearInterval 停止它。 var myTimer = setInterval(...); clearInterval(myTimer); #3楼上面的答案已经解释了setInterval如何返回一个句柄，以及如何使用该句柄取消Interval计时器。一些架构上的考虑：请不要使用“无作用域”变量。最安全的方法是使用DOM对象的属性。最简单的地方是“文档”。如果刷新是通过“开始/停止”按钮启动的，则可以使用该按钮本身： <a onclick="start(this);">Start</a> <script> function

workaround for FF5 and chrome setInterval(), setTimeout() in inactive tab

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问题 There is js optimalization causing inactive tabs to slow down setInterval() and setTimeout() in ff5 and chrome. I have it set for 66 miliseconds but it goes up to 1000 whne tab is inactive. There is way to determine how much time passed when the tab was inactive, but I need js keep running and performing actions, like playing sounds for some events. Is there any way to achive that? 回答1: The whole point of those clamps is to keep background pages from using too much CPU. What events, exactly

Angular.js - Apply filter using an interval

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问题 I am using a custom angular.js filter for datetime objects: function relativeTimeFilter() { return function (dateObj) { return getRelativeDateTimeString(dateObj); }; } function getRelativeDateTimeString(dt) { if(!dt) return "undefined ago"; var delta = dt.getSeconds(); if (delta < 0) return "not yet"; if (delta < 1 * 60) return delta == 1 ? "one second ago" : delta + " seconds ago"; if (delta < 2 * 60) return "a minute ago"; if (delta < 45 * 60) return Math.floor(delta/60) + " minutes ago";