This question already has answers here:
Why is my function call that should be scheduled by setTimeout executed immediately? [duplicate]
(3 answers)
Closed 7 years ago.
I wanted a JavaScript function to run 60 seconds after page is loaded.
After a little research I have made, I've found that setTimeout() is the solution.
So that's what I did:
<body onLoad="setTimeout(postAction('news.reads', 'article'), 60000);">
Somehow, setTimeout does not work. After the page is loaded, there's no need to wait 60 seconds because postAction() runs immediately.
Why is it happening? How to solve it? Are there alternatives to setTimeout() up there?
Thank you!
You need to wrap postAction in a function to defer execution:
setTimeout(function() { postAction('news.reads', 'article'); }, 60000);
You are actually executing postAction immediately, your code is equivalent to:
var result = postAction('news.reads', 'article');
setTimeout(result, 60000);
The correct way to do what you want in JS, ie setting a timeout after the page is loaded:
(function(w)
{
var load = function()
{
setTimeout(postAction,60000);
if (w.removeEventListener)
{//remove listeners, to avoid leak...
return w.removeEventListener('load',load,false);
}
return w.attachEvent('onload',load);
};
if (w.addEventListener)
{
return w.addEventListener('load',load,false);
}
return w.attachEvent('onload',load);
}(this));
Instead of window.onload = function(){setTimeout(postAction,60000);};, which will work, too, but cause a mem-leak in IE <9. That's just for completeness' sake
Anyway, the key line here is setTimeout(postAction,60000);
Update
After seeing the code you're using, this is the easiest fix:
<body onLoad="setTimeout(function(){ return postAction('news.reads', 'article');}, 60000);">
Are you using setTimeout like :
setTimeout(function(){alert("OK");}, 1000 * 60); // alert "OK" in 60s
<script>
function doSomeJavascript() {
// javascript code goes here
alert('5 secs is up!');
}
// calls function doSomeJavascript() 5 secs after page load
var interval = setInterval(doSomeJavascript, 5000);
setTimeout(function() {
window.clearInterval(interval);
}, 5000);
</script>
Related
This question already has answers here:
What's the easiest way to call a function every 5 seconds in jQuery? [duplicate]
(7 answers)
Closed 8 years ago.
How do I get this javascript to run every second?
source code:
<script type="text/javascript">
$(function() {
//More Button
$('.more').live("click",function() {
var ID = $(this).attr("id");
if(ID) {
$("#more"+ID).html('<img src="moreajax.gif" />');
$.ajax({
type: "POST",
url: "ajax_more.php",
data: "lastmsg="+ ID,
cache: false,
success: function(html){
$("ol#updates").prepend(html);
$("#more"+ID).remove();
}
});
} else {
$(".morebox").html('no posts to display');
}
return false;
});
});
</script>
Use setInterval() to run a piece of code every x milliseconds.
You can wrap the code you want to run every second in a function called runFunction.
So it would be:
var t=setInterval(runFunction,1000);
And to stop it, you can run:
clearInterval(t);
Use setInterval:
$(function(){
setInterval(oneSecondFunction, 1000);
});
function oneSecondFunction() {
// stuff you want to do every second
}
Here's an article on the difference between setTimeout and setInterval. Both will provide the functionality you need, they just require different implementations.
You can use setTimeout to run the function/command once or setInterval to run the function/command at specified intervals.
var a = setTimeout("alert('run just one time')",500);
var b = setInterval("alert('run each 3 seconds')",3000);
//To abort the interval you can use this:
clearInterval(b);
window.setTimeout(func,1000);
This will run func after 1000 milliseconds. So at the end of func you can call window.setTimeout again to go in a loop of 1 sec. You just need to define a terminate condition.
Reference
You can use setInterval:
var timer = setInterval( myFunction, 1000);
Just declare your function as myFunction or some other name, and then don't bind it to $('.more')'s live event.
Use setInterval(func, delay) to run the func every delay milliseconds.
setTimeout() runs your function once after delay milliseconds -- it does not run it repeatedly. A common strategy is to run your code with setTimeout and call setTimeout again at the end of your code.
This question already has answers here:
Why is the method executed immediately when I use setTimeout?
(8 answers)
Closed 6 years ago.
I'm having a javascript function which I have set an interval to execute every 30 seconds. This is my code:
function ping() {
// code ...
}
ping(); // call function when page loads for first time
// call function every 30 seconds
window.setInterval(function(){
ping();
}, 30000);
What I'd like to do is to delay the first call (right when the page loads for first time) for 5 seconds and then the function should execute again every 30 secs.
I have tried the setTimeout, but doesn't seem to work, it executes imidiatelly any ideas what I'm doing wrong ?
setTimeout(ping(), 5000); // delay first call for 5 secs
// call function every 30 seconds
window.setInterval(function(){
ping();
}, 30000);
I guess you are not waiting until timeout to declare the interval function.
There is a few different ways to do that, so let me suggest one:
function ping() {
// code ...
}
setTimeout(function () {
ping(); // call function when page loads for first time
// call function every 30 seconds
window.setInterval(function(){
ping();
}, 30000);
}, 5000);
You are calling it immediately on setTimeout(ping(), 5000);. You are setting the result of ping() as the timeout function. If you want ping to be called by the timeout, then either do setTimeout(ping, 5000); or wrap it in a closure, like you did the second time.
This question already has answers here:
How to stop a setTimeout loop?
(10 answers)
Closed 8 years ago.
please help with getting a right function or method to stop the setTimeout function.
I've been trying with the following codes but the setTimeout "loop" could not be stopped.
What i'm trying to do is to get the user's current location every 5 seconds, and then when i press the stop button. It stops getting the location.
function geoTrackstart(){
//geolocation code
});
timer = setTimeout(geoTrackstart, 5000);
}
function geoTrackstop(){
clearTimeout(geoTrackstart);
timer = 0;
}
I think you want to use like this:
function geoTrackstart(){
//geolocation code
});
timer = setTimeout(geoTrackstart, 5000);//set timer
function geoTrackstop(){
clearTimeout(timer);//clear the timer
//setTimeout(geoTrackstart,5000);//set timeout if you want to run again
}
If you're polling for the geo i'd use a interval rather than a timeout so that it's run every 5 seconds until you stop it, this way you don't have to create a new timeout every 5 seconds -- unless you wanted to create the timeouts manually.:
var geoFetchInterval;
function geoTrackstart(); {};
//if you want it to run immediately the first time
geoTrackStart();
//start the interval
geoFetchInterval = setInterval(geoTrackStart, 5000);
function getTrackStop() {
clearInterval(geoFetchInterval);
};
//assuming jquery
$('#stop-button').on('click', getTrackStop);
This question already has answers here:
how to kill a setTimeout() function
(5 answers)
Stop scheduled JavaScript execution
(4 answers)
Closed 9 years ago.
The title may be misleading, but it's essentially what I need to accomplish.
I have an AJAX "Loading" text that I want to update if the server has taken more than 15 seconds to respond.
Here is the code:
$(".loader").html('Loading');
$(".loader").show();
setTimeout(function () {
if ($('.loader').is(":visible")) {
$(".loader").html('Click here to reload.</span>');
}
}, 15000);
Is there a better approach? When I eventually call $(".loader").hide(); I want the setTimeout counter to be aborted. Is it possible?
Sure. setTimeout returns a value you can pass to clearTimeout in order to stop timeout.
var handle = setTimeout(function () {
alert("Oh noes, I ran!")
}, 5000)
clearTimeout(handle)
You can use the clearTimeout function:
$(".loader").html('Loading');
$(".loader").show();
var timerId= setTimeout(function () {
if ($('.loader').is(":visible")) {
$(".loader").html('Click here to reload.</span>');
}
}, 15000);
$(".stop").click(function () {
clearTimeout(timerId);
$(".loader").html("done");
});
See this fiddle: http://jsfiddle.net/KaNUP/
I would recommend to make a shorter period (1 sec) and increment counter inside function you call. Then you can exit on successfull load or counter threshold, whichever comes earlier.
This question already has answers here:
Why is my function call that should be scheduled by setTimeout executed immediately? [duplicate]
(3 answers)
Closed 8 years ago.
In my code i need to poll a url after every 5 seconds using ajax . The URL returns a json response. Below is the code that i wrote inside $(document).ready to do this. But,the setTimeout() function does not work. The startPoll() function is called immediately after the response is received.I want to halt for 5 seconds after response is received before calling the startPoll function again . Any way to fix this ?
$(document).ready(function(){
var startPoll = function() {
$.post('<url>', {},onPollRequestComplete, 'json');
}
var onPollRequestComplete = function(response) {
responseObject = eval(response);
if(responseObject.success) {
//Do something here
}
setTimeout(startPoll(),5000); /*Make next polling request after 5 seconds*/
}
startPoll();
});
Thank You
This is your problem:
setTimeout(startPoll(),5000);
You're calling startPoll immediately, not after 5 seconds. Instead, you should pass in the function reference, like so:
setTimeout(startPoll,5000);
If you want the polling to fire every 5 seconds even if previous polls didn't work (a server error was encountered), you should use setInterval instead. The code you have now is great if you want to be able to stop polling in case of errors.
I think rather than setTimeout you need to use setInterval
<html>
<head>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function() {
var startPoll = function() {
$.post('url', {}, function(response) {
var responseObject = eval(response);
if (responseObject.success) {
alert('hi');
}
}, 'json');
}
setInterval(startPoll, 5000); /*Make next polling request after 5 seconds*/
});
</script>
</head>
<body>
</body>
</html>