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5 ways to build real-time apps with JavaScript – freeCodeCamp

There was a point in time where we didn’t expect too much from web pages. Which reminds me, the Space Jam movie website is still on the internet in its original form. And it uses a frameset. Not iFrames. JamSPACE JAM, characters, names, and all related indicia are trademarks of Warner Bros. © 1996 Bros has some gently used copies of Dreamweaver was 1996. This is 2019. Times have changed and users expect a lot more out of websites. They don’t just expect them to look good, they expect them to be full on apps, and that includes being ApplicationsReal-time apps are those that react to changes anywhere in a connected application’s system— not just those made by the current canonical example of real-time is a messaging application. Like when you send a group of friends a text message about getting together for wings on Friday. Then update everyone minute by minute on your progress getting from work to the bar. Thanks, Trevor. Now we’re all trapped in a notification hell that we didn’t sign up for. I JUST WANTED SOME ’s that, Trevor? You’re only 10 minutes away now? REJOICE. Looking forward to single it comes to the web, there are several different patterns, technologies, libraries and services that you can use to get the real-time functionality that is usually reserved for native applications. I recently sat down with Anthony Chu who gave me 5 ways that you can build real-time apps in JavaScript. Anthony Chu #MSIgniteTheTour (@nthonyChu) | TwitterThe latest Tweets from Anthony Chu #MSIgniteTheTour (@nthonyChu). Cloud Advocate @Microsoft. Azure, ASP, …m1. Long-PollingThis is when the application requests updates from the server on a schedule. The app is “polling” the is the net equivalent of kids asking “are we there yet? ” every five minutes. Does it look like we’re there yet, kid? Ask me one more time and I swear to you that I will throw this copy of the “The Bee Movie” in a ditch and you can stare out the window at grass like we did when I was a can be implemented manually with any JavaScript HTTP library, such as jQuery or Axios. I have never actually implemented this myself. When doing some research for this article, I discovered that the best way to do this is to use a recursive function with setTimeout. This is because using setInterval does not account for requests that fail or timeout. You could end up with a bunch of ajax calls that are all processed out of is an example from the very nice article over on Tech Octave. (function poll(){
setTimeout(function(){
$({ url: “server”, success: function(data){
//Update your dashboard gauge
tValue();
//Setup the next poll recursively
poll();}, dataType: “json”});}, 30000);})();There are also libraries like pollymer (not to be confused with Polymer) that are specifically for long-polling. Get it? “poll”ymer? Cause it polls? Is this thing on? fanout/pollymerGeneral-purpose AJAX/long-polling library. Contribute to fanout/pollymer development by creating an account on is good because it works in every browser; even the super old ones. It’s bad because it’s super inefficient and not exactly “real-time”. It also has some weird edge cases (like request failures) that you have to program around as we’ve already seen with setInterval. A better alternative to long-polling is Server-Sent Events or SSE. 2. Server-Sent EventsServer-Sent Events (SSE) is similar to long-polling in so much as the client asks the server for information. The big difference is that with SSE, the server just holds the connection open. When an event occurs and there is information to send to the client, the server sends an event to the eventsTraditionally, a web page has to send a request to the server to receive new data; that is, the page requests data from…Back to our “road trip from hell” analogy, this would be like if the kid says “Are we there yet? ”, and then waited patiently for your response. Four sublime hours of silence later you arrive at the destination, turn around, and say “yes”. That’s the most unrealistic scenario I have ever come up with in my is part of the browser EventSource API. Note that according to, neither IE 11 nor Edge support SSE. That makes it kind of a tough technology to pick, however interesting it good news is that pretty much every browser supports Web Sockets. 3. Web SocketsWeb Sockets is a technology that facilitates a true two-way communication channel between a client and a server. Unlike Server-Sent Events, which is only communication from server to a client, Web Sockets can be used to communicate in both Sockets are, uh, kinda verbose. They aren’t really the kind of API’s you wanna build apps with. Kind of like you could make an HTTP request with the XHR object, but OMG NO. I Googled “PHP Web Socket Sample” and found this doozy from the PHP docs. I zoomed all the way out in Chrome and barely got everything in a single that’s ONLY the server portion. You still gotta wire up the …’s a no for rtunately, there are plenty of libraries that abstract Web Sockets even further so you don’t have to write any of this. One of those libraries is called “SignalR”. 4. SignalRSignalR is a library that implements Web Sockets both in JavaScript AND On the server, you create what is known as a “hub” in SignalR. This hub sends and receives messages from ients then connect to the hub (using the SignalR JavaScript library) and respond to events from the hub, or send their own events into the gnalR also falls back to long-polling whenever Web Sockets is unavailable. Although that’s not super likely unless you’re using IE 9 or is an example of setting up SignalR on the server…using System;
using;
namespace SignalRChat
{
public class ChatHub: Hub
public void Send(string name, string message)
// Call the broadcastMessage method to update clients.
(name, message);}}}OK, ok. I know this is not an apples to apples comparison with the PHP example from above, but I’m trying to make a point here. Just go with it. Do it for me. I’m having a rough SignalR makes it more fun to program Web Sockets, but you know what’s even more fun than programming them? Not programming them. 5. Azure SignalROften, when we want to set up real-time applications, building out a Web Socket server isn’t exactly a value-added activity. We do it, but only because we have to to get the real-time. We’d prefer that it “just worked” SignalR is exactly that. It is a SignalR Hub that you can consume on demand as a service. That means that you only have to send and respond to events — which is what you’re after in the first is Azure SignalRAn overview of the Azure SignalR create the SignalR Hub in Azure as an Azure Service, and then you just connect to it from the client and send/receive now you know… out the interview below with Anthony. We shot this one in Vegas while we were both at a conference and had a good time with a wig that I bought at Party City. Best 8$ I ever spent.
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How do they make real time data live on a web page? - Stack ...

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How do they make real time data live on a web page? – Stack …

How do they do this? I would like to have web pages with data fields that change in real time as a person views the web page. Here is an example.
How do they do this? JQuery? PHP?
I need to connect my field data to mySQL database.
Arnaud6, 5598 gold badges47 silver badges66 bronze badges
asked Oct 30 ’10 at 23:52
1
There are two approaches:
Polling
Client requests data on a regular basis. Uses network and server resources even when there is no data. Data is not quite ‘live’. Extremely easy to implement, but not scalable.
Push
Server sends data to the client, so client can simply wait for it to arrive instead of checking regularly.
This can be achieved with a socket connection (since you are talking about web pages, this doesn’t really apply unless you are using Flash, since support for sockets in the browser in the browser is currently immature) – or by using the technique known as ‘comet’.
Neither socket connections nor comet are particularly scalable if the server end is implemented naively.
– To do live data on a large scale (without buying a boat load of hardware) you will need server software that does not use a thread for each client.
answered Apr 8 ’11 at 0:37
TomTom7, 5347 gold badges40 silver badges56 bronze badges
I did it with JavaScript timer set execution in milliseconds, each time timer executed function that queried Server with Ajax and returned value(possibly JSON format), then you you update your field with the value. I did it each 5 sec and it works perfectly. In I think it called Ajax Timer Control.
answered Oct 30 ’10 at 23:59
danny. lesnikdanny. lesnik18. 2k28 gold badges123 silver badges195 bronze badges
2
There are two things needed to do this:
Code that runs on the browser to fetch the latest data. This could be Javascript or something running in a plugin such as Silverlight or Flash. This will need to periodically request updated content from the server.
Which leads to a need for…
Code that runs on the server to retrieve and return the latest data (from the database). This could be created with any server sided scripting language.
answered Oct 31 ’10 at 0:40
Matt LaceyMatt Lacey64. 6k10 gold badges89 silver badges143 bronze badges
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Real time web scraping - MyDataProvider

Real time web scraping – MyDataProvider

Web scraping is one of the most useful computer techniques that can be used to obtain data from the World Wide Web. It is an automated process that gathers particular information from a website and transfers it to another database or spreadsheet through the use of a bot. The process of web scraping is almost similar to the traditional “copy and paste” method except that it does not require manual copying and pasting of information from a web page to a document sheet. Since it is an automatic process, web scraping consumes less time than other data extracting techniques when processing web page information. This is also the reason why a lot of web crawlers can offer real time web scraping Process of Data ScrapingWeb crawlers are software bots that perform web scraping. The higher the speed and quality of a web crawler, the more it can perform real time web scraping. In web scraping, a bot fetches a web page and subsequently extracts the required data from it. The data to extract can be anything: images, text, email addresses, products, contact numbers, or videos. Once data is extracted, it is converted into a specified format that is usually more organized and readable for the user. Then, it is transferred to a destination like a spreadsheet or a database. Real time web scraping means regularly repeating this whole process each time the source web page changes its data or adds another data to its portance of Real Time Web ScrapingReal time web scraping is an important function for any web scraper as most of the web pages today are subject to frequent changes like structure changes, format modifications, or even content replacements. When this happens, only a real time web scraping function can keep a user updated to such changes. Real-life examples of data that are subject to constant updates include stock prices, daily weather, real estate listings, and price changes. The function of real time web scraping is to keep track of the changes in these data so the user is able to monitor them in Data Extracting ProgramsWeb scraping is actually easy to do so long as you have the appropriate tools. Fortunately, there are hundreds of programs that you can use for web scraping. You can even use Microsoft Excel as your web scraping tool. However, not all of the web scraping software can offer real time web scraping. And to help you decide which among the hundreds of available software programs to use, here are some of the best programs that feature real time web scraping functions:ContentbombThis is an all-in-one software that can convert data and submit outputs without the need of having an account to sign in. Aside from its real time web scraping feature, the software also allows you to create your own template for your outputs. You may also edit contents using its Content Mix Rule option. Since you can customize your own template, Contentbomb can save new contents to any specified format. It can even import outputs directly from a third-party software so you can use them without changing their formats. Contentbomb also comes with a default list of common web page sources. The list includes google RSS and other well-known content directories. You may add new content sources manually if you want to extract data from web sources other than the included sites. Additionally, Contentbomb can provide real time web scraping by automatically sending newly extracted contents to your desired destination (e. g. spreadsheet or site) on a 24/7 basis. You can find this option in the settings. DiggernautThis is a cloud-based web scraping tool that provides real time web scraping service as one of its offers. Its primary objective is to help users extract data from websites and normalize its format to produce a simple and organized output. Diggernaut is good for both programmers and non-programmers. It has a comprehensive meta-language documentation that can guide web-developers or programmers in building their own configuration or settings. For non-programmers, on the other hand, Diggernaut offers a Visual Extractor tool that can help them extract the specific data they want from a web page and convert it into their desired format and structure. Examples of data that Diggernaut can extract are government licenses and permits, statistical data, news and events, product prices, tax information, and real estate listings. All of these can be extracted in real-time using the software’s real time web scraping feature named “data on demand. ”OctoparseIt is like Diggernaut, Octoparse offers cloud services for web scraping which makes it a lot faster than normal software applications. This application is great for non-programmers as no coding is needed to make the software function. Plus, it is easy to use. Octoparse has 6 to 14 servers that work simultaneously, which makes real time web scraping possible for the program. It also offers scheduling options that let you schedule the exact hours when you want to extract data automatically. Octoparse also has a built-in browser where you can just type in the web page from which you want to extract the data. There are no limits to how many web pages you want to scrape as it can scrape hundreds of pages at once. Further, its cloud-based web crawling can scrape data 24/7 so real time web scraping is always possible to this program. The content extracted through Octoparse’s real time web scraping can be downloaded as an Excel file, an API (application program interface), or a CSV (comma separated values) file. It can also simply be sent and saved to a Scraping: a Decision Making ToolAside from real time web scraping, data scraping also has other various functions including data mining, website change detection, price monitoring, web indexing, and web mashup. Through the use of the programs listed above or any real time web scraping tool like MyDataProvider, a decision maker can extract up-to-date contents and can therefore make better decisions whether in business or in any other field.

Frequently Asked Questions about web real time data

How do I get real time data from a website?

Web scraping is one of the most useful computer techniques that can be used to obtain data from the World Wide Web. It is an automated process that gathers particular information from a website and transfers it to another database or spreadsheet through the use of a bot.

What is a real time web application?

The real-time web is a network web using technologies and practices that enable users to receive information as soon as it is published by its authors, rather than requiring that they or their software check a source periodically for updates.

What is Real Time Web Analytics?

Real-Time Web Analytics with Kinesis Data Analytics enables you to track website activity in real-time. Visualize web usage metrics including events per hour, visitor count, user agents, abnormal events, aggregate event count, referrers, and recent events.

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