I have two pages. The page 2 is accessible by the page 1.
The thing is I want to detect if someone came back to page 1 by the page 2 with a return button in order to display an other thing.
PAGE 1 -------------------------> PAGE
Normale Display Create SESSION or COOKIE
|
|
If SESSION or COOKIE <--------- Pressed back button
-> Secondary Display
So I tried to :
Create a cookie but it wasn't read
Create a Session variable but
it wasn't read neither
Empty the cache but I ended up with a warning message
Local Storage / Session Storage still react like a Cookie
Does anyone see a solution for me, either to force the read of one of those thing or force the page to acte as if it was a normale way of going to it when back button pressed?
Im open to any solution It's been two long days going around in circle.
EDIT :
Let change a bit my question by : How to detect if a page is reach using back button?
So I've seen this question but its an old one (2009) and an answer using Iframe which if I could avoid I'd like too.
The easiest way is to check for $_SERVER['HTTP_REFERER'] but if someone has multiple tabs opened while looking at your website it will not work properly.
I do not think that there is any "nice" solution to your problem.
Edit:
I guess that better question would be to ask what are you trying to achieve specifically. Why do you need to know if someone came to page 1 by the page 2 with a return button? Is there any other way how to solve your problem?
You can do that by changing the local storage I guess.
When page 2 is initialized, check if the precise storage of your local storage is empty or not. If not, display what you want in addition.
To do that you must put a controller which does that when he is called and don't forget to call it when the page 2 is loaded.
But you need to empty that local storage. Consequently you may want to reset it each time you go on another page except the seconde one.
It's kind of dirty, but it should work.
NB : It's pretty easy to do that with Angular JS. With pure Javascript it may be not that easy to do, but I'm pretty sure it is possible.
Hope that could help.
Ok so the solution was to send variables via history of url's.
Since HTML5 you can modify the history of navigation.
So basically the idea in my case was to send values in the url as in a get request :
yoursite.com/where_you_are?something=value
And for doing that you can modify url history with : history.replaceState({},'',newURL)
Eventually if you want to send object to your page you can use {} like this {myobject: value, ...}.
Hope this could help and have a look at the great documentation by mozilla linked above.
And eventually have a look there too
Related
I'm working on a basic voting system where I have 2 HTML pages (both on the same domain).
On page 1 there are two buttons of which the person should choose one.
One page 2 I want to visualise the chosen option in a graph.
The goal is that if a button is clicked on page 1, the data on page 2 updates automatically without refreshing the whole page.
In order to do this, I tried saving the clicked option in a localStorage. I managed to get the data by writing a variable using localStorage.getItem(''). However, when I get the data, I have to manually refresh page 2 for the result to show. Is there a way to update the data on page 2? So if I press multiple buttons, multiple responses will show on page 2?
I also saw that there is a possibility of using WebSockets. Since I'm only familiar with HTML and JavaScript, I was wondering whether it's possible to solve my issue without setting up a server and run things locally. If that's not possible, what would be the best (and maybe easiest) way to solve my issue?
If you have page 2 successfully reading a variable that you get from local storage (which is being updated by actions taken on page 1), you can make a timer with setInterval to read from local storage every x milliseconds. Then the graph will update on its own.
See documentation for setInterval here.
Maybe the best and simple solution is setting specific url parameters for each button selection.
Then on the page 2 you simply show conditionally according the url parameter.
Just like the title says. I want to create a shared online timer for my friends and say when one of my friends clicked the "refresh timer" button, ideally that all my other friends' page should get automatically refreshed with the new timer, or a notification saying that the timer has refreshed and require them to refresh the page.
I think at least the latter one is possible since when you get a comment of your question on Stackoverflow, you will get notified somewhere in the page telling you there's a new comment.
How to achieve this functionality? In JS or? Thanks in advance!
Javascript setInterval
using Javascript setInterval when the page is loaded, if you're not using MySQL, check a notepad for the text update(or whatever you want) and when it's found, clear it and then run whatever code
When the user presses a button, have it write to the file update(the same thing as above)
There would be 2 ways to go about it:
Simpler one would be to use polling through setInterval and look for changes on the backend.
A more accurate way would be to use Websockets which relay information to the clients that the timer has been reset.
Your choice of tool would depend on how complex you're willing to let it be
I have a small app which calls an URL and scrape the data returned from it. I now want to do something similar for another site but this site uses JavaScript and the results are not included in the html. I've found a way to retrieve the data by using "stringByEvaluatingJavaScript" but to complicate things, the results I want is displayed on the webpage only after I click a button / function on the website:
i.e. To get to display the results I want, I have to:
1) go to the website. (data is displayed but not what I want) 2) click one of the options on the site. (data I really want is displayed)
The URL of this page never changes, as expected being JavaScript. So I want to know if there's a way to call the page so that when the page is displayed, it is already on the option I want, e.g. "https://example.com/page1?option" etc...
I don't know if this is possible since I don't know JavaScript but technically I think it should be?
Thanks.
I would use the Developer Tools/javascript console on your browser
(Chrome has a pretty good one) to see what the browser sends to the
server when you click on the button, then use that as the basis for
your query. – cowbert
#cowbert's suggestion really did the trick! Upon digging more, I found more results in the Chrome console and one of them actually has the link to the data which is what I need!
Thank you to all who contributed! This is my first post here so if I didn't do something right, please forgive me.
I have a little web app (which only has 1 page) that allows user to input and select some options. The input texts and selections will be displayed in another div in the form of table. You may want to refer to the example here: http://jsfiddle.net/xaKXM/5/
In this fiddle, you can type anything and after you clicked submit it will get the text input and append them to another table #configtableTable
$('#labels #labelTable tr:last').after(addmore);
$('#configtable #configtableTable tr:last').after(displaymore);
I'm using cherrypy as a mini web server (and thus major codes are written in python) and i know that it has session here but i have no idea how to use it at all as the example given is not really what i want to see.
FYI, i'm not using PHP at all and everything is in a single page. i simply show and hide them. But I want the page to remain as showing #configtableTable and hiding #labelTable even after refresh. Note that the fiddle is just part of the web app which will only show all these after getting a reply from another device.
Not sure about cookie because all the links i've found seem broken. How about jQuery session? Is it applicable in my case? I need some examples of application though :(
okay, to conclude my questions:
1. can i save the page state after refresh? and how? which of the methods mention above is worth trying? is there any examples for me to refer? or any other suggestions?
2. can i simply DISABLE refresh or back after reaching a page?
Thanks everyone in advance :)
Don't disable Refresh and / or back navigation. It's a terrible idea - user's have a certain expectation of what actions those buttons will perform and modifying that leads to a bad user experience.
As for saving state, while you could use session or cookies, if you don't need that data server side, you can save the state on client side as well.
For example, you could use localStorage
Alternatively, you could create an object out of the data in the table, JSON.stringify() it and append it to the url like this: example.com#stateData.
In case of either option, at page load, you'd have to check if there is state data. if you find there is, then use it to recreate the table, instead of displaying the form.
The disadvantage of the first, is that not all browsers support localStorage.
The disadvantage of the second is that URLs have a length limit and so this solution won't necessarily work for you if you're expecting large amounts of data.
EDIT
It appears that Midori does support most HTML5 features including localStorage however, it's turned off by default.. (I'm trying to find a better reference). If you can, just point Midori to html5test to see what HTML5 features it supports.
I would like to create a similar effect to Apple's Safari 4 Beta Top Sites page -
when when you view it and a page's content has changed since you last visited, it displays a blue star in the top right hand corner to notify you.
I would like to do the very same, but only within my website and instead of an image I would like to append a '*' or some other character to the menu item's link.
I'm sure you would use the jQuery Cookie Plugin, but my scripting is not that advanced and I do not know how to dynamically change the cookie's content. Have I explained properly? How would I do it?
Many thanks in advance
Server side:
Read the website f.ex every minute and save the timestamp if changed content.
Save the users' visit timestamp to the page
Ajax:
Check if the websites update timestamp is newer than your visitors' timestamp, if yes make the star class visible, when the user clicks on the link, make the star disappear and update the users timestamp.
--
Showing a star or an image or whatever with Jquery is not the big deal here, it's a oneliner, the complex problem is to detect website changes, because minor changes can occur, but the main content could not change. The easiest way to do this would be if the website provides rss, then there's probable that the important new content will be published via rss.
You're asking a very vague question. Have you even attempted this? Please try it first then ask for help along the way.
Also, this is not something you necessarily need jQuery for. You could do it completely on the backend. But it's hard to say which solution is best for you without know anymore details.
I guess I would recommend using php and storing the cached page into a db (in other words the user would have a "fav pages" account) then when the user visits the "fav pages" webpage, you would fetch all the users favorite pages and compare it to what has been stored in the db. But for certain pages (for example if they have a date/time string), it would be very difficult to tell if the change was something the user wants to know about. Probably you would need to create a complex algorithm to decide what change is good change and what change is just certain website features.