Javascript - form submit and refresh only once - javascript

Currently I have a script that refreshes my 'chat' page every 10 seconds, as it retrieves the chat from a database. However at the moment once the page is loaded I have to wait 10 seconds (or the seconds i specify in the current js) for the chat to show.
I am not sure how to go about making the chat load initially on window.onload just once, and then every 10seconds. I've tried quite a few ways but they just lead to the onload constantly executing.
current js
<script>
window.onload = function() {
window.setTimeout('document.chatMsgListForm.submit()', 10000)
}
</script>
I gave this a shot too
<script>
var done;
window.onload = function(){
while(!done) {
document.forms['formChat'].submit()
done=true;
}
}
window.onload = function() {
window.setTimeout('document.formChat.submit()', 10000)
}
</script>
But no luck unfortunately.
Thank you

You should to look at using AJAX polling or long polling with WebSockets or something else.
Look this answer and this article, for example.

Related

JQuery interval isn't working

I've made a small script to load a page into a div of another page, which gets refreshed every 5 seconds.
The page is loaded as expected, but the interval doesn't seem to work.
I already searched for a solution, but all threads are saying that my code should work like that. So I decided to post the full code here.
JQuery (and AJAX):
<script>
function load(){
$('#chatload').load('/intern/chat/chatlogframe.php/?name=muster',function () {
$(this).unwrap();
});
}
load(); // run it on pageload
setInterval(function(){
load() // this should run every 5 seconds
}, 5000);
</script>
The chatlogframe.php file contains a SQL Select query. The data should be reloaded every time the scipt gets executed.
UPDATE:
I checked the Chrome Console where it says Uncaught TypeError: $(...).unwrap is not a function
I don't think that the function is wrong, but maybe it helps.
UPDATE 2:
Heres the html div:
<div id='chatload'></div>
It works. May be there's some issue with your code in $('#chatload').load('/intern/chat/chatlogframe.php/?name=muster',function () {
$(this).unwrap();
});
.unwrap() could be possible issue but to isolate that you would need to post your sample HTML container.
function load() {
console.log("Do something");
$('#chatload').load('https://jsonplaceholder.typicode.com/posts/1', function() {
$(this).unwrap();
});
}
load(); // run it on pageload
setInterval(function() {
load() // this should run every 5 seconds
}, 5000);
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="chatload"></div>

Javascript: How do I run a function after a page reloads

My aim is to reload a page at a certain interval and run a function.
I have read about storing the function in my localStorage and calling it when the page reloads via body onload. I wish to run this code on my console on a page so I don't think the <body> works. Correct me if I am wrong.
A good example would be, continued reloading of a Ebay page and it gets the prices of all toys, then it reloads and gets the price again and it continues to reload till I close the browser. But every time I reload I can't run my function.
All help is appreciated, for my understanding.
Small example:
var
ready = function() {
setTimeout(function() {
//alert('Yay!');
location.reload();
}, 3000); // 3000 ms => 3 seconds
};
<body onload="ready()">
<h1>Page!</h1>
</body>
You can do this with the setinterval function.
It will repeat something afer a certain amount of time.
For the reload, its not really needed as you can call a ajax request and just change the parts that is needed.
example :
setInterval(function () { alert("Hello"); }, 3000);
It will alert out Hello every 3 secounds
If I understand you correctly, you want to run some script at the third-party website (e.g. Ebay), reload page and do it all again.
You can use some browser extensions. For example, that one.
This extension detect page URL and runs any script you have written for it.So, your script automatically runs by extension, do some work, reloads page and then repeats all.
// script runs automatically by extension:
$( function() {
// do some work:
/* some work */
// and then reloads page:
location.reload();
} );
100% working. :)
<html>
<head>
<meta http-equiv="Refresh" content="10">
<script type="text/javascript">
var whenready = function() {
alert('It Works Man..!!');
};
</script>
</head>
<body onLoad="whenready()">
<h1>Page!</h1>
</body>
</html>
$(window).bind("load", function() {
// code here
});

How to refresh mysql posts every 1 second

I use ajax to save user posts/comments into a mysql table without page refresh.
First: I have this <div id="posts-container"></div>
Second: I've tried using Jquery load() to loop in table and echo the posts, with the following code:
var auto_refresh = setInterval(function() {
$('.posts-container').load("refresh_p.php").fadeIn();
}, 0 );
But it doesn't work, page refreshes but content doesn't load, anybody knows why?
Third: If i copy the code that contains refresh_p.php and paste into the data gets loaded successfully. A little weird? Yes. Hope get any help :)
EDIT:
I fixed it, the problem was in refresh_p.php it was expecting the parameter 'profile_id'
i modified the function to this:
1: profile.php
search_user = document.getElementById('user_from').value;
var auto_refresh = setInterval(function() {
$('.posts-container').load("refresh_p.php?search_user="+search_user).fadeIn();
}, 5000 );
2: refresh_p.php
$profile_id = $_GET['search_user'];
All good, but now the whole page refreshes every 5 seconds. I just want the div 'post-container' to refresh.
I've used this function before to refresh a chat box and it worked, only refreshes the div i wanted to. but here it refreshes the entire page.
Don't use setInterval. Do recursive calls on jQuery load complete, this way you make sure that calls are sent one AFTER another, not at the same time.
Try this:
var auto_refresh = function () {
$('.posts-container').load("refresh_p.php", function(){
setTimeout(auto_refresh, 800);
}).fadeIn();
}
auto_refresh();
Also, .fadeIn() only works the first time, after that you have to hide the div before showing it again.
Demo: http://jsfiddle.net/P4P9a/1/ (might be slow because it is loading an entire page).
LE: As I think you are not returning an HTML page you should use $.get instead of $.load .
$('.posts-container').get("refresh_p.php", function(data){
$(this).html(data);
setTimeout(auto_refresh, 800);
}).fadeIn();
var auto_refresh = setInterval(function(){
$('.posts-container').load("refresh_p.php").fadeIn(50);
},1000);
Changed the interval from 0 (which would just create a crazy load...) to 1000ms (1 second). Should work if your path is correct.
Make sure your interval is long enough for your requests to finish. Also think about less real-time options, such as sending an array of messages every 15 seconds, showing them one after another on the client side. Optimize your server side for quick response using caching and also think about using json data and client side templating instead of html responses.

Javascript won't load using jQuery Mobile with navigation-geolocation

I am having an issue with jQuery Mobile, javascript and get geolocaton.
I am currently using following to get the code to load, when I enter the page:
$(document).on('pageinit', function(){
If the user has set visibility to visible, a div with the ID visible is shown, this I use to call the geolocation the first time:
if ($('#visible').length) {
navigator.geolocation.getCurrentPosition(sucessHandler, errorHandler);
}
After this I call the geolocation every 20th second:
setInterval(function() {
if ($('#visible').length) {
navigator.geolocation.getCurrentPosition(sucessHandler);
}
}, 20000);
My issue is, if I leave the page for one of the subpages, and return to this page, these codes won't run again. I have tried the following to load the javascript, instead of pageinit:
$(document).on('pagebeforeshow', '#index', function(){
and
$(document).on('pageinit', '#index', function()
I tried loading it in the body of the index as well.
Any help would be greatly appreciated =)
Regards, Fred
Firstly, you may want to consider replacing navigator.geolocation.getCurrentPosition() with navigator.geolocation.watchPosition(). This will call your success or error handler functions each time the device receives a position update, rather than you needing to ping it every 20 seconds to see if it has changed.
With regard to page changing, so long as you’re using a multi-page template, then the handler function should get called while navigating to and from any sub-pages.
Here’s a JS fiddle illustrating this
Hope this helps!

How can I fix my JavaScript page refresh

I'm trying to use jQuery to make a slightly more sophisticated page refresh. With a meta refresh, if a page fails to load once, it won't load again. I am trying to make something that will repeatedly try to load--if it fails to load once, it will try again the next time so that if the last load is successful I will see a fresh version of the page, whether or not there were intervening faults.
My code at present is:
<script language="JavaScript" type="text/javascript" src="/include/jquery.js">
</script>
<script language="JavaScript">
var delay=5*1000;
function load(){
setTimeout(load, delay);
jQuery("#content").load("calendar_internal.cgi?days=40", function(){
jQuery("#preload").hide("slow");
});
delay = 15*60*1000;
}
jQuery("#content").load("calendar_internal.cgi?days=40", load);
</script>
So far as I can tell, this is functioning as a noop. It doesn't refresh.
How can I get this to work at least at a basic level so it refreshes but one bad refresh doesn't mean that I have to reload if I want to see the page at all?
--EDIT--
What I have now is apparently working (after light testing):
<script language="JavaScript">
var placeholder = jQuery('<div></div>');
function load(){
setTimeout(load, 15*60*1000);
placeholder.load("logistic_ajax.cgi", function(){
if (placeholder.html())
jQuery('#content').html(placeholder.html());
})
}
load();
</script>
var $placeHolder = $('<div />');
$placeHolder.load(yourURL,function() {
if ($placeHolder.html()) {
$("#content").html($placeHolder.html());
}
});
or something like that. This way you are not doing all or nothing type of thing. If something messes up with the HTML coming back, you can check in your "if" condition. Not sure the particulars of the response so you would need to hash that out on your own or let me know more detail.
Cheers.

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