Okay. The issue I am having is I am simply trying to do a refresh loop for my webbrowser (firefox) I would like this in JS. I understand It can be done in other languages pretty easily if you ask me. But, javascript is a must! :D This is not an html page, just a simple .js file ran with iMacros for Firefox.
Here's the code I am using.
setInterval(refreshPage(), 5000);
function refreshPage() {
window.location.reload(1);
}
window.location.reload(1); refreshes the page without a problem :D sweet!!!
But when I use the setInterval or setTimeout mumbojumbo I always get ReferenceError: setTimeout is not defined...
Very strange. I Googled so hard and all searches return the same setInterval and same setTimeout options... no one is defining anything. o_O what in the world! lol
Can one of you JS WIZARDS crack this code. I need a WIZARD to save me :D
Your question is not clear. Your code uses setInterval, but your error is about setTimeout.
Let me assume that you want and use setInterval because that makes more sense as you want to refresh the page every 5 seconds.
The setInterval function is defined by the browser. It requires a function name as first argument. You passed in a function call.
To fix it, simple delete the pair of parentheses:
setInterval(refreshPage, 5000);
function refreshPage() {
window.location.reload(1);
}
That is because you are looking for
window.setInterval(function(){refreshPage()}, 5000);
Could also just call the function as noted in the comments:
window.setInterval(refreshPage, 5000);
Related
So in my js script I use jQuery, at the top I wrote:
$(function() {
myFunc();
function myFunc() {
console.log("1");
}
});
"1" is only printed once which means myFunc only ran once, I want it to run every frame/millisecond or basically as fast as it can over and over and over again. Why doesn't it happen like so? If I'm doing it wrong, how can I achieve the effect I want, and what is my mistake?
#Vadim Tatarnikov to call as soon as faster a function in jquery use
window.setInterval() with minimum time interval try the below code
<script type="text/javascript" src="jquery.js"></script>//add your jquery script file
<script type="text/javascript">
$(document).ready(function(){
window.setInterval(function(){
myFunc();
},1);//here i put time interval=1 millisecond
});
function myFunc(){
console.log("1");
}
This will call myFunc() in every 1 millisecond just run and see the console.
you have written IIFE (immediately invoked function expressions) and the main function runs only once.
You need to call your inner function using setInterval with 0 milliseconds gap.
$(function(){
function myFunc(){
console.log("1");
}
setInterval(myFunc,0);
});
your anonymous function (the outer one) runs when the page is loaded. This places a call to myFunc which outputs 1 to the console and then ends. If you wanted to loop you might try calling myFunc at the end of the myFunc function, but if you did this you would find that your browser would hang and that eventually you run out of memory. This is because the call stack would grow and grow, never allowing the UI to respond as javascript is completely in control!
Alternatively, you can use setTimeout(myFunc, delay) at the end of your method, which will call it again after a certain amount of milliseconds has passed. This will not fill the call stack and will allow the UI to respond, but you will have to specify the interval.
A final way is to use 'setInterval(myFunc, delay)' in the place of your outerbody call to 'myFunc()'. This will repeatedly call your function every 'delay' milliseconds forever.
From the comments, it seems to be clear that you are in dire need to having a Responsive Framework.
Bootstrap is the most popular HTML, CSS, and JS framework for developing responsive, mobile first projects on the web.
It removes the need for having/designing separate pages for mobile and desktop.
Just go through the pre-defined bunch of CSS classes and you are set.
No need to write complex logic for window resizing and all that..
Hope it helps.
If you just need to check for changing window size per your comment, try
$(function () {
$(window).resize(function () {
//insert code here
});
});
you can use setTimeout() for execute same function after some interval assume 5 seconds
$(function() {
myFunc(); // call initially when dom is ready
function myFunc() {
console.log("1");
setTimeout(function(){ myFunc(); }, 5000) // runs after every 5 seconds
}
});
you can use setInterval() as well.
$(function() {
function myFunc() {
console.log("1");
}
setInterval(myFunc,0);
});
Your code only runs once (when the page loads). If you want to run code as fast as your computer can handle, use while(true) {/Your Code here.../} or var interval = setInterval(1, function() {/Your Code Here/});will run the code every 0.001 seconds, and clearInterval(interval); to stop the code from running. See this link for more details.
You can do by:
while(1){
myFunc();
}
But explain your requirement first.
If you want a function to run every time you should be placing your function in setInterval with interval of 1ms though its not a recommended way of doing it.
$(function(){
setInterval(myFunc,1)
function myFunc(){
console.log("1");
}
});
could you please explain your use case for the same,or you could also try to wrap your function call inside a loop.
I would like to put a delay after a button is pressed in order for the button to load the data from the cache before executing the next line of code. Would putting a sleep be the best way to do this?
Something like this or is there an alternative approach to best solve this problem?
setInterval(document.getElementById("generateButton"), 1000);
Don't use setInterval to do this. It doesn't have the functionality you seem to desire (it repeats). Instead, use jQuery and do something like this:
$("#generateButton").click(function(event){
setTimeout(function(){
//Do what the button normally does
}, 1000);
});
Or (without JQuery):
var generateButton = document.getElementById("generateButton");
generateButton.addEventListener("click", function(){
setTimeout(function(){
//Do what the button normally does
}, 1000);
});
Using setTimeout over setInterval is preferred in your case because setTimeout runs only once while setInterval runs multiple times.
I assume you have, in your html, <button id='generateButton' onclick='someFunction()'>Button Text</button>. Remove the onclick='someFunction() and put your someFunction() where I said (in the examples) "Do what the button normally does."
You can also add in the code that loads the cache a method that calls another method once the cache has been loaded (when the someFunction() from the button is called, it loads the cache, and at the end of the function (set this up using callbacks), once the cache has been loaded, it calls another method onCacheLoaded() that can be run once the cache has been loaded.
You should use callbacks, so the moment you loaded data from cache you can call it and continue executing the rest of the script.
You cannot use interval since you cannot be sure how much time is needed for the data to load. Though keep in mind the asynchronous nature of javascript and don't block the part of the script that does not depend on the data that's being loaded.
Try setTimeout:
myButton.addEventListener('click', function() {
setTimeout(delayed, 1e3); // Delay code
}, false);
function delayed() {
// Do whatever
}
Note setInterval runs a function periodically, setTimeout only once.
Also note that the delayed code must be a function (or a string which will be evaluated, but better avoid that). However, document.getElementById("generateButton") returns an html element (or null).
I am working on an application that sends current timestamp to database every 2 minutes with AJAX using setInterval.
But somehow setInterval stops after some minutes (i didnt calculate the exact time), but i believe it happens when i dont open that browser's tab for 20-30 minutes.
function tmstmp() {
$.post("send_functions.php?act=time");
}
$(function() {
setInterval(tmstmp, 60000);
});
Is that normal that setInterval stops if that tab is not on foreground ?
If yes, how can i prevent setInterval to stop ? or check if it stopped ?
Thanks
You should try to make an function call on page startup:
test();
and then loop that function:
function test() {
setTimeout(function() {
// your code
test();
}, 2000);
}
That's not supposed to happen.
Browsers may indeed reduce the timer resolution to something around 1/s, but not clear the setInterval.
Could there be some bug in your code that causes a clearInterval?
No code + no debug information = hard to tell what went wrong.
Just to be sure add the following line to the code (method) that gets executed with setInterval and watch after 20-30 minutes if you still get output in the console.
console.log('Yep! I am alive!');
EDIT: Could be anything but try changing the tmstmp method to include a callback function after the POST request gets executed. That way you'll at least know that it works.
function tmstmp() {
$.post("send_functions.php?act=time", function(data){
console.log('Yep! I am alive!');
});
}
I have this script on a page of mine and the setTimeout function never fires. It's just an alert right now but i'm just testing it out. I'm doing a meta refresh on the page just after it if that's any clue, but i've also given that a 10 sec delay so the page isn't refreshed before it's supposed to trigger.
Also, the related question: If I run a javascript with a delay of, say, 10 seconds (with setTimeout) and in that javascript I try to modify a design element that's not on the page when the setTimeout is declared but will be by the time the script is fired. Will it work?
<script language=javascript>
var xmlhttp_get_memento;
function loop_alerte(){
setTimeout( function() {
alert("timeout");
}, 5000);
xmlhttp_get_memento = new XMLHttpRequest();
if (xmlhttp_get_memento==null)
{
alert ("Browser does not support HTTP Request (1)");
return;
}
var url="crm/ajax/get_mementos.php";
url=url+"?sid="+Math.random();
xmlhttp_get_memento.onreadystatechange=function() {
if (xmlhttp_get_memento.readyState == 4) {
alert(xmlhttp_get_memento.responseText);
schimbare_tip_cursor("default");
}
else{
schimbare_tip_cursor("progress");
}
};
xmlhttp_get_memento.open("GET",url,true);
xmlhttp_get_memento.send(null);
}
loop_alerte();
</script>';
Your setTimeout looks good, so there's probably something else that's wrong. Have you tried using a javascript debugger to see if you get any errors?
As for your second question, yes, that shouldn't be any problem, as the anonymous function inside the setTimout won't be evaluated until it runs. Live sample here: http://jsbin.com/afonup/2/edit Both with and without jQuery.
There is nothing wrong with your setTimeout, you will need to debug further
As for your second question -- the function will run, but whatever it is you were trying to do will not work.
Cleaning up your code would be a nice start. I can imagine a browser doesn't understand the tag <script language=javascript>. I suggest to use <script type="text/javascript"> and if you're lucky, your javascript might work!
I want to cut down the numbers of the event execution time
and so I wrote something like this:
var slow=function(method,context){
method.id&&clearTimeout(method.id)
method.id = setTimeout(function(){
method.apply(context,arguments)
}, 500)
}
window.onload=function(){
function print(){ console.log("thanks a lot") }
document.body.addEventListener("mousemove",function(){
slow(print)
}, false)
}
If I move too fast in the body, and the print function won't be executed immediately, but it doesn't seem to be work.
Can somebody help?
At first look, You have'nt provided the context parameter in the call to slow
I'd suggest using Ben Alman's throttle/debounce plugin. It doesn't actually require jQuery at all. If you don't have jQuery on the page, it just adds itself to the Cowboy namespace.
https://github.com/cowboy/jquery-throttle-debounce/blob/master/jquery.ba-throttle-debounce.js
Otherwise, you could at least get a good idea of how he does this from the code here.