Run JS SetTimeout function only once per domain - javascript

I've implemented a Splash Screen in JQuery on my WordPress Site on Document ready.
setTimeout(function() {
$("#site-overlay").fadeOut();
}, 3000);
Ok, the Overlay fades out after 3 seconds. But if I click on a menu button, the whole page reloads and the function settimeout repeats because its on the document ready.
How can I set this only for one time per Domain without using complicated code?

What you will have to do is implement cookies or something alike
I would suggest https://github.com/yanivkalfa/myCookie which is my own library but there are other like its so you can pick one.
The point is to set a flag or something in a cookie or session that says that you already done the action you want.
e.g:
// <script .... https://github.com/yanivkalfa/myCookie .. inclode my cookies library
setTimeout(function() {
var overlayFlag = $.fn.myCookie({cName: "overlayFlag"});
if (!overlayFlag) {
$.fn.myCookie( {cName : "overlayFlag", cVal : true} );
$("#site-overlay").fadeOut();
}
}, 3000);
Something along these lines, there are other solutions .. this seemed a simple.

Another solution would be to use the document.referrer which I find better than the cookie, because if I close the page and reopening it, it would not do the fadeOut code.
So, I extract the domain from the referrer and compare with current one.
setTimeout(function() {
var referrerDomain = document.referrer;
if (referrerDomain != "") {
referrerDomain = referrerDomain.substring(document.referrer.indexOf('//') + 2);
referrerDomain = referrerDomain.substring(0, referrerDomain.indexOf('/'));
}
if (referrerDomain != window.location.host) {
$("#site-overlay").fadeOut();
}
}, 3000);

Ok, i got the solution for me :) session cookie was the answer.
/* check if session cookie is set, if not so set the cookie and animate the Overlay
* The session cookie will destroy if the BROWSER is closed (not TAB)
*/
if( document.cookie.indexOf("overlayed=") < 0)
{
document.cookie = "overlayed=true; path=/";
$("#site-overlay").show();
$("#site-overlay-content").show().center();
setTimeout(function()
{
$("#site-overlay").fadeOut(750);
}, 3000);
}

Related

Unique jQuery popup issue

So I have to have a popup form display once per user session, the client wants it to popup after 10 seconds. If the user navigates to another page on the site, the form still needs to popup and not display after the user closes it on any other part of the site. Here is the jQuery I have written so far.
$(document).ready(function() {
sessionStorage.setItem('firstVisit', '1');
if (sessionStorage.getItem('firstVisit') === "1") {
setTimeout(function() {
$('.verif').fadeIn('fast');
}, 1000);
} else {
$('.verif').hide();
}
});
I have the form on each page and right now it just pops up all the time. Am I using the wrong method for the situation? All suggestions are welcome.
Note that the line 2 always sets firstVisit as '1' in session storage. This way, the expression for if will always be true and thus, user will always see the popup.
You need to get the item first, and check its value. Then if it doesn't exist, set it.
$(document).ready(function() {
var item = sessionStorage.getItem('firstVisit');
if (!item || item !== "1") {
setTimeout(function() {
$('.verif').fadeIn('fast');
}, 1000);
sessionStorage.setItem('firstVisit', '1');
} else {
$('.verif').hide();
}
});
Also, using sessionStorage is not a good idea as it is volatile across page refreshes. You, instead, may want to use localStorage for this as you mentioned that this needs to be done for any page.

How to know if there is a previous page [duplicate]

I want using JavaScript to see if there is history or not, I mean if the back button is available on the browser or not.
Short answer: You can't.
Technically there is an accurate way, which would be checking the property:
history.previous
However, it won't work. The problem with this is that in most browsers this is considered a security violation and usually just returns undefined.
history.length
Is a property that others have suggested...
However, the length doesn't work completely because it doesn't indicate where in the history you are. Additionally, it doesn't always start at the same number. A browser not set to have a landing page, for example, starts at 0 while another browser that uses a landing page will start at 1.
Most of the time a link is added that calls:
history.back();
or
history.go(-1);
and it's just expected that if you can't go back then clicking the link does nothing.
There is another way to check - check the referrer. The first page usually will have an empty referrer...
if (document.referrer == "") {
window.close()
} else {
history.back()
}
My code let the browser go back one page, and if that fails it loads a fallback url. It also detect hashtags changes.
When the back button wasn't available, the fallback url will be loaded after 500 ms, so the browser has time enough to load the previous page. Loading the fallback url right after window.history.go(-1); would cause the browser to use the fallback url, because the js script didn't stop yet.
function historyBackWFallback(fallbackUrl) {
fallbackUrl = fallbackUrl || '/';
var prevPage = window.location.href;
window.history.go(-1);
setTimeout(function(){
if (window.location.href == prevPage) {
window.location.href = fallbackUrl;
}
}, 500);
}
Here is how i did it.
I used the 'beforeunload' event to set a boolean. Then I set a timeout to watch if the 'beforeunload' fired.
var $window = $(window),
$trigger = $('.select_your_link'),
fallback = 'your_fallback_url';
hasHistory = false;
$window.on('beforeunload', function(){
hasHistory = true;
});
$trigger.on('click', function(){
window.history.go(-1);
setTimeout(function(){
if (!hasHistory){
window.location.href = fallback;
}
}, 200);
return false;
});
Seems to work in major browsers (tested FF, Chrome, IE11 so far).
There is a snippet I use in my projects:
function back(url) {
if (history.length > 2) {
// if history is not empty, go back:
window.History.back();
} else if (url) {
// go to specified fallback url:
window.History.replaceState(null, null, url);
} else {
// go home:
window.History.replaceState(null, null, '/');
}
}
FYI: I use History.js to manage browser history.
Why to compare history.length to number 2?
Because Chrome's startpage is counted as first item in the browser's history.
There are few possibilities of history.length and user's behaviour:
User opens new empty tab in the browser and then runs a page. history.length = 2 and we want to disable back() in this case, because user will go to empty tab.
User opens the page in new tab by clicking a link somewhere before. history.length = 1 and again we want to disable back() method.
And finally, user lands at current page after reloading few pages. history.length > 2 and now back() can be enabled.
Note: I omit case when user lands at current page after clicking link from external website without target="_blank".
Note 2: document.referrer is empty when you open website by typing its address and also when website uses ajax to load subpages, so I discontinued checking this value in the first case.
this seems to do the trick:
function goBackOrClose() {
window.history.back();
window.close();
//or if you are not interested in closing the window, do something else here
//e.g.
theBrowserCantGoBack();
}
Call history.back() and then window.close(). If the browser is able to go back in history it won't be able to get to the next statement. If it's not able to go back, it'll close the window.
However, please note that if the page has been reached by typing a url, then firefox wont allow the script to close the window.
Be careful with window.history.length because it also includes entries for window.history.forward()
So you may have maybe window.history.length with more than 1 entries, but no history back entries.
This means that nothing happens if you fire window.history.back()
You can't directly check whether the back button is usable. You can look at history.length>0, but that will hold true if there are pages ahead of the current page as well. You can only be sure that the back button is unusable when history.length===0.
If that's not good enough, about all you can do is call history.back() and, if your page is still loaded afterwards, the back button is unavailable! Of course that means if the back button is available, you've just navigated away from the page. You aren't allowed to cancel the navigation in onunload, so about all you can do to stop the back actually happening is to return something from onbeforeunload, which will result in a big annoying prompt appearing. It's not worth it.
In fact it's normally a Really Bad Idea to be doing anything with the history. History navigation is for browser chrome, not web pages. Adding “go back” links typically causes more user confusion than it's worth.
history.length is useless as it does not show if user can go back in history.
Also different browsers uses initial values 0 or 1 - it depends on browser.
The working solution is to use $(window).on('beforeunload' event, but I'm not sure that it will work if page is loaded via ajax and uses pushState to change window history.
So I've used next solution:
var currentUrl = window.location.href;
window.history.back();
setTimeout(function(){
// if location was not changed in 100 ms, then there is no history back
if(currentUrl === window.location.href){
// redirect to site root
window.location.href = '/';
}
}, 100);
Building on the answer here and here. I think, the more conclusive answer is just to check if this is a new page in a new tab.
If the history of the page is more than one, then we can go back to the page previous to the current page. If not, the tab is a newly opened tab and we need to create a new tab.
Differently, to the answers linked, we are not checking for a referrer as a new tab will still have a referrer.
if(1 < history.length) {
history.back();
}
else {
window.close();
}
This work for me using react but can work in another case; when history is in the first page (you cannot go back) window.history.state will be null, so if you want to know if you can navigate back you only need:
if (window.history.state == null) {
//you cannot go back
}
Documentation:
The History.state property returns a value representing the state at
the top of the history stack. This is a way to look at the state
without having to wait for a popstate event.
I was trying to find a solution and this is the best i could get (but works great and it's the easiest solution i've found even here).
In my case, i wanted to go back on history with an back button, but if the first page the user opened was an subpage of my app, it would go back to the main page.
The solution was, as soon the app is loaded, i just did an replace on the history state:
history.replaceState( {root: true}, '', window.location.pathname + window.location.hash)
This way, i just need to check history.state.root before go back. If true, i make an history replace instead:
if(history.state && history.state.root)
history.replaceState( {root: true}, '', '/')
else
history.back()
I came up with the following approach. It utilizes the onbeforeunload event to detect whether the browser starts leaving the page or not. If it does not in a certain timespan it'll just redirect to the fallback.
var goBack = function goBack(fallback){
var useFallback = true;
window.addEventListener("beforeunload", function(){
useFallback = false;
});
window.history.back();
setTimeout(function(){
if (useFallback){ window.location.href = fallback; }
}, 100);
}
You can call this function using goBack("fallback.example.org").
There is another near perfect solution, taken from another SO answer:
if( (1 < history.length) && document.referrer ) {
history.back();
}
else {
// If you can't go back in history, you could perhaps close the window ?
window.close();
}
Someone reported that it does not work when using target="_blank" but it seems to work for me on Chrome.
the browser has back and forward button. I come up a solution on this question. but It will affect browser forward action and cause bug with some browsers.
It works like that: If the browser open a new url, that has never opened, the history.length will be grow.
so you can change hash like
location.href = '#__transfer__' + new Date().getTime()
to get a never shown url, then history.length will get the true length.
var realHistoryLength = history.length - 1
but, It not always work well, and I don't known why ,especially the when url auto jump quickly.
I am using window.history in Angular for the FAQ on my site.
Whenever the user wants to exit the FAQ they can click the exit button (next to the back button)
My logic for this "exit" strategy is based on the entry ID and then just go back the number of states till that state.
So on enter:
enterState: { navigationId:number } = {navigationId: 1}
constructor() {
this.enterState = window.history.state
}
pretent the user navigates through the faq
And then, when the user clicks the exit button, read the current state and calculate your delta:
exitFaq() {
// when user started in faq, go back to first state, replace it with home and navigate
if (this.enterState.navigationId === 1) {
window.history.go((window.history.state.navigationId - 1) * -1)
this.router.navigateByUrl('/')
// non-angular
// const obj = {Title: 'Home', Url: '/'}
// window.history.replaceState(obj, obj.Title, obj.Url)
} else {
window.history.go(this.enterState.navigationId - window.history.state.navigationId - 1)
}
}
As you can see, I also use a fallback for when the user started in the faq, in that case the state.navigationId is 1 and we want to route back, replace the first state and show the homepage (For this I'm using the Angular router, but you can use history.replaceState as well when you handle your own routes)
For reference:
history.go
history.state
history.replaceState
Angular.router.navigateByUrl
This might help:
const prev = window.location.pathname;
window.history.back();
setTimeout(() => {
if (prev === window.location.pathname) {
// Do something else ...
}
}, 1000);
I'm using Angular, I need to check if there is history, trigger location.back(), else redirect to parent route.
Solution from https://stackoverflow.com/a/69572533/18856708 works well.
constructor(
private activatedRoute: ActivatedRoute,
private router: Router,
private location: Location,
}
...
back(): void {
if (window.history.state === null) {
this.router.navigate(['../'], { relativeTo: this.activatedRoute });
return;
}
this.location.back();
}
This is my solution:
function historyBack() {
console.log('back');
window.history.back() || window.history.go(-1);
if (!window.history.length) window.close();
var currentUrl = window.location.href;
setTimeout(function(){
// if location was not changed in 100 ms, then there is no history back
if(current === window.location.href){
console.log('History back is empty!');
}
}, 100);
}
function historyForward() {
console.log('forward');
window.history.forward() || window.history.go(+1);
var current = window.location.href;
setTimeout(function(){
// if location was not changed in 100 ms, then there is no history forward
if(current === window.location.href){
console.log('History forward is empty!');
}
}, 100);
}
The following solution will navigate back AND will tell if the navigation occurred or not:
async function goBack() {
return new Promise((resolve, reject) => {
const timer = setTimeout(() => reject('nowhere to go'), 100);
window.history.back();
const onBack = () => {
window.removeEventListener('beforeunload', onBack);
window.removeEventListener('popstate', onBack);
clearTimeout(timer);
resolve(true);
};
window.addEventListener('beforeunload', onBack);
window.addEventListener('popstate', onBack);
});
}
// usage
await goBack().catch(err => console.log('failed'));
How it works:
Try to navigate back
Add event listeners that will trigger on navigation to another website or to another page on the same site (SPA website, etc.)
If above events didn't occur in 100ms, deduce that there's nowhere to go back to
Notice that goBack() is an async function.
var fallbackUrl = "home.php";
if(history.back() === undefined)
window.location.href = fallbackUrl;
I am using a bit of PHP to achieve the result. It's a bit rusty though. But it should work.
<?php
function pref(){
return (isset($_SERVER['HTTP_REFERER'])) ? true : '';
}
?>
<html>
<body>
<input type="hidden" id="_pref" value="<?=pref()?>">
<button type="button" id="myButton">GoBack</button>
<!-- Include jquery library -->
<script>
if (!$('#_pref').val()) {
$('#myButton').hide() // or $('#myButton').remove()
}
</script>
</body>
</html>
var func = function(){ console.log("do something"); };
if(document.referrer.includes(window.location.hostname) && history.length-1 <= 1){
func();
}
else{
const currentUrl = window.location.href;
history.back();
setTimeout(function(){
currentUrl === window.location.href && func();
}, 100);
}
I found a JQuery solution that actually works
window.history.length == 1
This works on Chrome, Firefox, and Edge.
You can use the following piece of JQuery code that worked for me on the latest versions of all of the above 3 browsers if you want to hide or remove a back button on your developed web page when there is no window history.
$(window).load(function() {
if (window.history.length == 1) {
$("#back-button").remove();
}
})
Solution
'use strict';
function previousPage() {
if (window.location.pathname.split('/').filter(({ length }) => length > 0).length > 0) {
window.history.back();
}
}
Explaination
window.location.pathname will give you the current URI. For instance https://domain/question/1234/i-have-a-problem will give /question/1234/i-have-a-problem. See the documentation about window.location for more informations.
Next, the call to split() will give us all fragments of that URI. so if we take our previous URI, we will have something like ["", "question", "1234", "i-have-a-problem"]. See the documentation about String.prototype.split() for more informations.
The call to filter() is here to filter out the empty string generated by the backward slash. It will basically return only the fragment URI that have a length greater than 1 (non-empty string). So we would have something like ["question", "1234", "i-have-a-question"]. This could have been writen like so:
'use strict';
window.location.pathname.split('/').filter(function(fragment) {
return fragment.length > 0;
});
See the documentation about Array.prototype.filter() and the Destructuring assignment for more informations.
Now, if the user tries to go back while being on https://domain/, we wont trigger the if-statement, and so wont trigger the window.history.back() method so the user will stay in our website. This URL will be equivalent to [] which has a length of 0, and 0 > 0 is false. Hence, silently failing. Of course, you can log something or have another action if you want.
'use strict';
function previousPage() {
if (window.location.pathname.split('/').filter(({ length }) => length > 0).length > 0) {
window.history.back();
} else {
alert('You cannot go back any further...');
}
}
Limitations
Of course, this solution wont work if the browser do not support the History API. Check the documentation to know more about it before using this solution.
I'm not sure if this works and it is completely untested, but try this:
<script type="text/javascript">
function goBack() {
history.back();
}
if (history.length > 0) { //if there is a history...
document.getElementsByTagName('button')[].onclick="goBack()"; //assign function "goBack()" to all buttons onClick
} else {
die();
}
</script>
And somewhere in HTML:
<button value="Button1"> //These buttons have no action
<button value="Button2">
EDIT:
What you can also do is to research what browsers support the back function (I think they all do) and use the standard JavaScript browser detection object found, and described thoroughly, on this page. Then you can have 2 different pages: one for the "good browsers" compatible with the back button and one for the "bad browsers" telling them to go update their browser
Check if window.history.length is equal to 0.

Differentiate between button click and javascript page reload

I'm trying to differentiate between page click and auto reload. Auto reload is done through javascript below.
var pageReload = {
Initialize: function () {
window.setTimeout("location.reload(true);", 60000);
}
pageReload.Initialize();
I'm trying to set a hidden variable in the above code for which I'm trying to check the changed value in Page_PreRender to understand the difference between page click and auto reload.
var hdnReloadType = document.getElementById('<%=hdnReloadType.ClientID%>');
hdnReloadType.value = "1";
The javascript is loaded after PreRender and I'm sure how to proceed.
Any thoughts?
Thank you for all the replies.
Because I'm using asp.net, I was able to capture the previous page click url from Request object and from there I'm determining if this was a page auto reload or button click. The query string reload option is great too but we didn't want to expose that to the user. This solution worked for my case.
Instead of just doing a reload(), you could add a "reloaded" parameter to the URL. If we use something like the replaceUrlParam() function from this answer, we can say:
var pageReload = {
Initialize: function () {
window.setTimeout(
function() {
var url = replaceUrlParam(window.location.href, 'reloaded', '1');
window.location.href = url;
},
60000
);
}
}
pageReload.Initialize();
Now, when the page has been auto-reloaded (and only then), the query string will contain "reloaded=1".
You could always use localStorage to leave a breadcrumb behind when your function reloads the page:
localStorage.setItem( 'page-reloaded', 'true' );
When the page loads, check for the breadcrumb:
var reloaded = localStorage.getItem('page-reloaded') || false;
And then cleanup afterwards:
localStorage.removeItem('page-reloaded');

I think clearInterval problems

I came here like many beginners :D So without wasting a time I will explain my problems.
http://heavenpro.lt/ukv - website of demo. There a 2 users etc.
sekret - demo
demo - demo
(for login) if you will see any error - would be happy to know to have a chance to solve it.
When users turned off (Išj. - button) demo user sees log: Waiting for student (Laukiama studento)
after sekret turn it on (Įjungt - button) everything seems okay, demo user sees active user, after clicking to next one - gives alert that was changed student and if you want to update information (to see new one) however.. after turning off (Išj. button) Works good in all browsers except IE.. Seems that clearInterval not works and after lot of sent queries and respons it pops out more than one Alert window..
Hope you understood that i mean.
var sid = "{$i->sid}";
var mid = "{$i->mid}";
var update_st = setInterval(function(){
$.post(
'ajax/check-student.php',
{ sid: sid, mid: mid },
function(resp){
if(resp == "next") {
var cf = confirm('Buvo pakeistas studentas besiginantis darbą. Ar rodyti sekantį studentą?');
clearInterval(update_st);
if (cf) {
window.location = "?";
}
else {
alert('Kai norėsite perjungti kitą vartotoją, prašome perkrauti puslapį.');
clearInterval(update_st);
}
}
else if (resp == "none") {
alert("Gynimas baigtas. Ačiū už dalyvavimą vertinimo komisijoje.");
clearInterval(update_st); // this place not works..
window.location = "?";
}
});
}, 250);
Tested lot times.. seems sometimes works normaly.. Tested on IE 9..
Of maybe can anyone offer any others ideas to do same way? Without many queries per second sending to file...
You can use setTimeout instead of setInterval, many reasons...
So you will call function that creates setTimeout! And this method will guarantee that your code will be executes iff query to server is done!
var a = function(){
var timer = setTimeout(function(){
// ok your ajax query success of error whatever
a();
console.log(2)
}, 1000);
}
a();
You must put your query inside setTimeout, and call a function after query done or whatever!
So demo

to excute a function after 3se

i want to reload the page after 3second we visited the page with out repeating
i tried using
var t;
t=setTimeout(function(){
window.location.reload();
},3000);
but page is loading continuously
so i tried like this
var t;
t=setTimeout(function(){
clearTimeout(t);
window.location.reload();
},3000);
this trick is also not worked
can any one help me of how to reload the page after 3second without repeating
That is because when the page is reloaded, the script is also reloaded so the browser runs it again. One solution is to use cookie.
function SetMeow() {
var a = new Date();
a.setTime(a.getTime() + 9999999999999999999);
document.cookie = "Cat=meow;expires="+a.toGMTString();
}
var b = document.cookie.replace(/(?:(?:^|.*;\s*)Cat\s*\=\s*([^;]*).*$)|^.*$/, "$1");
if(b!="meow"){
var t=setTimeout(function(){
SetMeow();
window.location.reload();
},3000);
}
You will need a flag, use local storage or cookie, and change when you reload the page once. Or the new interval will be set again everytime the page loads.
Well, when you refresh a page a completely new page is loaded so you can't actually do that.
In a nutshell you need to save state between pages, this can be done in multiple ways:
send an AJAX request to some side script
save state in a Cookie
use HTML5 LocalStorage
The localStorage one is the easiest:
var t = setTimeout (function () {
if (localStorage.dontReload && JSON.parse(localStorage.dontReload)) { return }
window.location.reload();
localStorage.dontReload = true;
}, 3 * 1000);
Things to keep in mind about localStorage:
it only works new relatively new browsers (things older than 2 years
ago will most likely have issues, but it's not a problem in modern
browsers)
it only saves values in string format
it only saves the values on the current domain so the values will be local to the page you're in :)

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