Develop Reference

Click back button twice to go back in history

I have a single page application and would like to navigate through the history using browser back and forward button. I am facing an issue when i click the back button once it does not navigate to the previous page but stays on the current page. Then when i click the browser back again it takes me to the previous page. I have tried out the following.
class PageModule {
constructor() {
window.addEventListener("popstate",function(){
this.handleHistory(true);
}.bind(this),false);
}
handleHistory(popStateEventFired = false){
if(popStateEventFired){
history.replaceState();
}else{
history.pushState(null,null);
}
history.pushState(null,null);
}
When i issue a search i add the search param as a query param in the url ?question=testsearch and call the method handleHistory(). I have checked other answers to similar problem but they dont seem to help.
I have to do this using vanilla javascript or knockoutjs as we maintain HTML bindings using knockoutjs but am not able to achieve this properly.
Any help is appreciated

Detect if tag is in URL and then remove hidden class

I have a form on my contract form, which submits to a third party site and then I can define a URL to return the user to. I currently return the user to the same /contact page but I wanted to give them a message that it had submitted (since ajax forms don't work with the third party) and I don't want to have a whole page for it.
Therefore I had the idea to return the user to /contact#thanks
I have some code on my site which goes like this:
<div id="alert" class="hidden">Form Submitted. We will reply soon.</div>
Now I want a small bit of javascript on my page which detects if the URL has the #thanks tag on it, as above, and then removes the hidden class from my alert div. Is javascript able to detect this and if so, how do I go about it?

Include jquery and script. I test and work
$(document).ready(function(){
if(window.location.hash) {
$("#alert").show()
}
});
Siii = Yes use hash

I'm not totally sure that I've understood what are you trying to achieve, but this might help you:
if (window.location.hash === '#thanks') {
document.getElementById('alert').classList.remove('hidden');
}

Detect which link was clicked with javascript that got user to specific page

Been searching on the web for a solution, but couldn't find anything, so maybe it's not possible, although I hope it still is.
What Im trying to do is detect the button (class or id) that was clicked when being redirected to another page on my site.
What I have is a portfolio page that contains a large amount of divs with different classes, so when someone clicks on a specific button on the homepage and gets redirected to the portfolio page, is it possible to detect on the portfolio page how the visitor got directed from. So detect which button got clicked.
no idea how to approach this, something maybe with if previous window.location last action find class or id.
Hopefully my question makes sense and someone can give me an idea if even possible.
I imagine it would rather be possible to do with php, but unfortunately server side languages are not an option in this case.
Thanks

Examples of methods you can use
add the information in the originating url - use location.search or location.hash depending on your choice of ? or #
Set a cookie (or use session/localStorage in modern browsers) in originating page and read it in the target page
Interrogate document.referrer (not always set)

You can't do it without either modifying the links (adding a query string or hash), or having code on the source pages (where the links are).
The former is pretty obvious: Just add a query string or hash (I'd use a hash) that identifies where the click came from, and look for the hash on the portfolio page. E.g., links:
Portfolio
Portfolio
and in the portfolio page:
var from = location.hash;
If you don't want to do that, and you can put code on those pages, it's easy: Add a click handler that sets information about the link in sessionStorage (very well-supported on modern browsers), and look for it in sessionStorage when you get to the portfolio page.
E.g.,:
$(document).on("click", "a", function(e) {
// Maybe check the link is going to portfolio, or refine the selector above
sessionStorage.setItem("linkFrom", this.className);
});
and then in the portfolio page:
var from = sessionstorage.getItem("linkFrom");

You can use window.localStorage to save the last id of the clicked element.
localStorage.setItem('last_clicked_id', id);
And then read it in the next page:
localStorage.last_clicked_id
Before running you should check for localStorage support:
if(typeof(Storage) !== "undefined") {
//localStorage code
} else {
//no localStorage support
}

this is how it works: the recent page or url is set on the URL parameters like a GET server request, but instead the client will receive it and parse it not the server. the recent page or url is on the "fromurl" parameter. on every page put this in (it's a javascript code):
function getURIparams(s) {
loc = window.location.href;
loc = loc.substring((loc.indexOf("?")+1));
loc = loc.split("&");
for (l = 0; l < loc.length; l++) {
lcc = loc[l].split("=");
if (lcc[0] == s) {
return lcc[1];
break;
}
}
}
next on every anchor link put this in href:
The Link to another page
after that, on every page execute this javascript:
from_url = getURIparams("fromurl");
the "from_url" variable will be the string variable of where the user clicked before it comes to that page.
if you are to lazy to put all those anchor one by one like this, do this work around but you need jquery for this. you dont need to put the parameter on the links for it to know where it comes from it will be automatically added by jquery.
$(document).on('click', 'a', function(e){
e.preventDefault();
window.location.href = e.target.href + "?fromurl=" + window.location.pathname;
});

Changing shown URL after GET Request

Currently I have 2 pages based on the following URL MyNewApp/purchase and MyNewApp/confirm. On the 2nd page that is /confirm I added a back button with the following
HTML
<button type="submit" class="btn" id="back">
Go Back
</button>
JS
$('button[id="back"]').click(function() {
this.form.action="backToPurchase";
this.form.method="GET";
});
After pressing the back button everything works fine except the URL changed to /MyNewApp/backToPurchase?_method=. How can I set the URL to /MyNewApp/purchase after pressing the back button ?

You Can't just change the URL as you wish.
Think about it, if you could change the URL like that it would be a big security problem.
BUT try to use POST instead, or just send the user to a new page so the URL will change, You have lots of options to solve it, just think.

This is technically the answer to your question, though you might want to think about a better way to do what you want.
window.history.pushState(null, null, “/new-url”);

I would recommend a better option, instead of submitting a form just for redirection, use the following:
$('#back').click(function() {// <-- selecting by id is much faster than selecting by attribute "id"
location.href = '/backToPurchase'; // or '/purchase';
// OR you can do the following :
history.back(); //this will performs as you clicked the back btn from the browser
});

How to capture the destination url in onbeforeunload event

I want to use onbeforeunload to give a message to users before leaving certain pages.
Is it possible to know which url they are supposed to jump to at the onbeforeunload event?
Thanks

Is it possible to know which url they are supposed to jump to at the onbeforeunload event?
No, definitely not. The onbeforeunload event tells you only that the page is about to be unloaded, but not why.

It depends on how the user is leaving the page.
If they are typing an url in the address bar - then you're out of luck. As far a I know there's no way to capture the url of an address bar jump.
If they are clicking on a link contained somewhere on the page - that you can use the click event to capture the url and then decide how you want to handle things.
I posed a similar question
How can i get the destination url of a link on the web page in the javascript onbeforeunload event?
because I had a project to fix a wholesale order form. During the process of filling out an order my client's customers would go back to the catalog to check on a product's detail page and loose the current information on their order form.
By using the code below (which uses JQuery though I'm sure you could create the same thing in pure Javascript if you had to) I could tell when the user clicked a link that would leave the order form and then give them the option of opening the link in a new window/tab or loading the url in the current window and loosing their form data, or just returning to the form. This code works with all of the major browsers, at least their more recent versions.
$('body a').click(function(e) {
//if link references a page element
if ($(this).attr('href').charAt(0)=="#") {
return;
}
//check if link is to same window
var pathname = window.location.pathname;
var pathname2 = $(this).attr('href');
pathname2 = pathname2.replace(/^.+\.\//, '');
if (pathname.indexOf(pathname2) >= 0) {
//link clicked is contained on same page
//prevent page from getting reloaded & losing data
e.preventDefault();
e.stopImmediatePropagation();
e.stopPropagation();
return;
}
//link clicked on is another page
if (hasMerchandise) { //var to indicate user has items on order form
//give user options: leave page, open link in other page, stay, etc.
// $('.popupForm-handleExitRequest').click(); //roll your own code
//prevent page from getting reloaded & losing data
//in case user wants to cancel page change or open link in another window
e.preventDefault();
e.stopImmediatePropagation();
e.stopPropagation();
} else {
//load new page
$(this).removeAttr('target');
}
});