By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. For a simple webapp that needs to refresh parts of data presented to the user in set intervals, are there any downsides to just using setInterval to get a JSON from an endpoint instead of using a proper polling framework?

I would use setTimeout [docs] and always call it when the previous response was received. I know this is an old question but I stumbled over it, and in the StackOverflow way of doing things I thought I might improve it. You might want to consider a solution similar to what's described here which is known as long polling. OR another solution is WebSockets one of the better implementations of websockets with the primary objective of working on all browsers socket.

The first solution is basically summarized as you send a single AJAX request and wait for a response before sending an additional one, then once the response has been delivered, queue up the next query. Meanwhile, on the backend you don't return a response until the status changes.

So, in your scenario, you would utilize a while loop that would continue until the status changed, then return the changed status to the page. I really like this solution. As the answer linked above indicates, this is what facebook does or at least has done in the past.

This is closer to a Blackberry's instant notifications, which - if you're going for instant, it's the best solution. Just modify bschlueter's answerand yes, you can cancel this poll function by calling cancelCallback.

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Using setInterval to do simplistic continuous polling Ask Question. Asked 8 years, 3 months ago. Active 6 months ago. Viewed 38k times. For the sake of the example, lets say I'm refreshing status of a processing job every 5 seconds.

ajax poll

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I would use setTimeout and always call it when the previous response was received. This way you avoid possible congestion or function stacking or whatever you want to call it. I've done it just like FelixKling said and works like a charm. Try it! Can FelixKling, could you please post that as the answer and I'll accept?

Active Oldest Votes. From my comment: I would use setTimeout [docs] and always call it when the previous response was received. Felix Kling Felix Kling k gold badges silver badges bronze badges.

A nice analysis here on why avoiding setInterval is a good idea: weblogs.Alright, real-time was exaggerated, I just need to update the display value every second. The long-polling technique see also: push technology jumped to my mind at first.

While a true push is not possible without the server side support, one can however emulate it using recursive ajax call with normal http request but with slower frequency. The code above will work. But the real requirement was that the old long-polling need to be stopped and start a new long polling immediately with new parameter when clicking on a new button or new folder or something.

I used the jquery plugin fancytree to build a tree structure, and when I click on the tree element, I will get the title of the element which is the parameter of the long-polling call.

You will see that the lastClicked variable will never be cleared within the longPolling function, unless another click event starts. In fact, I hate so many global variables. You are commenting using your WordPress. You are commenting using your Google account.

You are commenting using your Twitter account. You are commenting using your Facebook account. Notify me of new comments via email. Notify me of new posts via email. This site uses Akismet to reduce spam. Learn how your comment data is processed. This article focuses mainly on solving 3 problems: Apply long-polling technique using jquery ajax function.

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Code Review Stack Exchange is a question and answer site for peer programmer code reviews. It only takes a minute to sign up. I was hoping some of you could give it a look over and give me any pointers on redundant code or bad practices.

Instead of success and completeuse the more standard Promise method then.

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Instead of a recursive setTimeoutuse setInterval instead. This avoids your code from rescheduling a callback on each iteration. You can always clear interval timers with clearInterval.

When using setIntervalclearing the timer will suffice for stopping the polling. You don't need the boolean flag to tell you to stop. When using setIntervalyou don't need an extra function for a recursive call anymore. You also seem to use OOP. It is normally advised to put methods on the prototype and not the instance so that methods are shared per instance and not created per instance.

It is usually not advised to use inline scripts. Use addEventListener to bind your click handlers. Booleans are usually prefixed with an ishas or are depending on the grammar.

This is to not mistake a property as some other non-boolean value.

PrimeFaces - Ajax Poll Example

Put the url and interval in a variable that acts as a constant. That way, you can easily configure as well as spot the values and not dig through code. I prefer to do object definition in an IIFE, unless you're willing to use Babel or some other transpiler. I've included comments detailing other thoughts on certain pieces. I also agree with Joseph's recommendations too so I did my best to try not to repeat much if any of them.

Here is what your Request definition would look like:. I did alter your API contract though, you really should think about reusability when you're building "classes.

There is an optional second argument that sets the interval but will specify to if none is given.Voting has now begun! Visit the internet website address or call the telephone number on the Voter Information Letter to access your ballot. You will need to enter your PIN and your date of birth to begin voting.

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Learn to Use AJAX Polling for Interactive Surveys

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ajax poll

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Online Poll and Voting System with jQuery AJAX

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ajax in php part-1 (complete poll system )

World Canada Local. Canada election results: Ajax. Full Menu Search Menu. Close Local your local region National. Search Submit search Suggested Search. Close X. Scroll back to top of the page Back to top. By Staff Global News. Smaller font Descrease article font size - A.

Share this item facebook Share this item via WhatsApp whatsapp Share this item on Twitter twitter Send this page to someone via email email Share this item on Pinterest pinterest Share this item on LinkedIn linkedin Share this item on Reddit reddit Copy article link Copy link. Trending Stories. Canada is flattening the coronavirus curve. Story continues below advertisement. Flyers More weekly flyers. Report an Error.Sometimes there isn't the event you can hook into to signify that a given task is complete, so you need to get your hands dirty and simply poll for it.

Polling with JavaScript isn't difficult but it's not easy either. Let me show you a few implementations of JavaScript polling that you can add to your toolbox! Since the Promise API is implemented almost all browsers today, here's a polling implementation using them:.

The difference here is that there's no return value -- the callback functions take the place of the Deferred instance. During my time writing front-end functional tests with the Intern testing framework, I've used polling quite a bit both on the server and client sides. This technique will always have its place so make sure you have a snippet like this available.

You've probably heard the talk around the water cooler about how promises are the future. All of the cool kids are using them, but you don't see what makes them so special. Can't you just use a callback? What's the big deal? In this article, we'll Adding just a few META tags to each page allowed links to my article to be styled and presented the way I wanted them to, giving me a bit of control Once concept I'm very fond of is lazy loading.

ajax poll

Lazy loading defers the loading of resources usually images until they are needed. Why load stuff you never need if you can prevent it, right?

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I've created LazyLoad, a customizable MooTools plugin that This gem of The code above does not work as is. In practice, fn returned value is async so that you get a success with an empty callback.

I am trying to figure out how to do this properly…. If the fn is an ajax call, then this polling will not work because the return value is Deferred. The second one can be simpler using just a timeInterval.

Correct me if I am missing anything, or if this might behave differently to your second implementation:. The following gist should help. By David Walsh December 10, By David Walsh December 9, Discussion Andrea Giammarchi. David Walsh.

Can you provide an example of the code not working? Om Shankar. How would you even use one of these functions? How are you going to cancel the polling when an external event occurs? Continue this conversation via email Get only replies to your comment, the best of the rest, as well as a daily recap of all comments on this post. Use Code Editor.This page provides a list of scientific, nationwide public opinion polls that were conducted from the Canadian federal election leading up to the Canadian federal electionwhich was held on October For riding-specific polls see constituency polls.

Aside from conducting the usual opinion surveys on general party preferences, polling firms also survey public opinion on who would make the best Prime Minister:. From Wikipedia, the free encyclopedia. This section needs to be updated. Please update this article to reflect recent events or newly available information. November Categories : Opinion polling in Canada Canadian federal election. Namespaces Article Talk.

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