AJAX stands for Asynchronous JavaScript and XML, and it's a technique used in web development to allow web pages to update content dynamically without the need to reload the entire page.

When a user interacts with a web page, for example by clicking a button, the web browser sends a request to the server for the requested data or content. In traditional web development, the server would respond to the request by sending back an entire new web page, which would then replace the current page. This can result in slow and inefficient user experience.

With AJAX, instead of reloading the entire page, the web browser sends an asynchronous request to the server using JavaScript. The server then responds with the requested data, usually in JSON or XML format, which the JavaScript code can use to update the content of the current page dynamically. This process allows the web page to update content without requiring a full page refresh.

AJAX can be used in conjunction with HTML and CSS to build interactive and responsive web pages. HTML and CSS are used to structure and style the page, while JavaScript is used to handle the dynamic content updates with AJAX requests.

In terms of implementation, AJAX can be accomplished using the XMLHttpRequest (XHR) object in JavaScript. With XHR, you can make an HTTP request to the server and receive a response, which can then be used to update the page. Alternatively, many modern JavaScript frameworks and libraries, such as jQuery and React, have built-in functions and methods for making AJAX requests that simplify the process.

AJAX, sometimes written as Ajax, stands for Asynchronous JavaScript And XML. It means that JavaScript, usually running in a Web page, performs an asynchronous network operation in order to retrieve some data. Originally this data was primarily formatted as XML, but currently it’s primarily in JSON format. (AJAX was not renamed to AJAJ however.) Because the network operation is asynchronous, the web page is not blocked while waiting for the requested data to arrive. Instead is can continue to respond to user interactions. Once the data does arrive, the JavaScript code would like use it to update the display.

Prior to AJAX, web sites would respond to user interactions by navigating between pages. This meant that almost every user interaction resulted in a page transition. The user would then need to wait for the next page to load, and could not interact with the site before loading was finished. AJAX enabled a much smoother user experience, which was no longer interrupted by these page transitions.

(Various hacks did exist prior to AJAX in order to avoid page transitions, but they were kludges at best.)

An example of user interface made possible by AJAX is the Google Search textbox, where it’s able to retrieve possible results as the user types, and display them in a dropdown list. Thanks to the asynchronicity of AJAX, this does not interfere with the user’s typing.

Sadly, it is not as simple as saying just 'one solution covers all'. Working at TagMan http://www.tagman.com/, I see a lot of tools/tags/solutions and there is no 'one glove fits all'.

Bare in mind that each tool has a different method of recording and reporting on 3rd party tags. Some are simply 'scanners' that scan a page - and others use large panel/sample based data on top of the scan to be more accurate.

From the perspective of "http inspection tools" such as WASP, Charles, Observe point etc,thislist I created some time ago, 'rates' SIXTEEN separate tools http://list.ly/list/AD-inspection-tools-for-measure and worth a read through.

3rd Party Data Collection and Elements.
For seeing what elements/tags your site is built with,scanning for 3rd party trackers and who is 'dropping them' - there are other sites and tools such as:

Evidon's 'Encompass' (uses Ghostery panel data)
http://www.evidon.com/solutions/encompass

Privacy Choice offer you a free scan of your site / App.
http://privacychoice.org/

Built With (Shows you elements and tags the page is made out of)
http://builtwith.com/

Krux's Inspector (hierarchical visual framework view)
http://www.krux.com/pro/whatwedo/protect/krux_inspector/

Pixel Stuffing/Malware
You should also not forget that if there are 'banner adverts' on the page or any form of iframe that is controlled external to your site (doubleclick floodlight etc) - pixels can be stuffed in those also or be reported as 'on page' by ghostery and others, so reporting is never an exact science.

To help 'publishers' to stop pixel stuffing and malware in the creative on their websites from networks etc - also look at solutions from

Adometry: (TagScan)
http://www.adometry.com/publishers-ad-networks/tagscan/index.php

AppNexus (Watson)
http://www.appnexus.com/custom-exchange

Rubicon (REVV)
http://www.rubiconproject.com/protection/

Single Page Apps tend to be simpler to develop and maintain, since all the application and UI logic is in one place. By now, any new web app worth its salt is going to be interactive and make heavy use of JavaScript whether it's a Single Page App or not; you therefore stand to benefit by making the app exclusively JavaScript instead of ending up with a UI layer that straddles between client and server. The old-school way is to do all UI on the server; with Ajax, we ended up doing this mix between the two, and the way forward is to now do all the UI in the browser. Furthermore, since most server-side environments use a language other than JavaScript, you end up having to implement and maintain the same logic in two different languages, e.g. a validation routine.

Single Page Apps are easier to get started because you can usually kick off development from a file:/// URI, without needing any server at all. You can often start that way and add a server later on, when you need data services to communicate with. I have begun many a happy hacking session by typing "vim index.html" and "open index.html" to launch that file in the browser. Some of those went on to become real apps, where I did nothing more than upload a few files to be served as static documents (e.g. http://listoftweets.com). These server-less apps can also be mailed around and stuck on USB sticks and share drives. See TiddlyWiki (http://tiddlywiki.org).

Single Page Apps are easier to test. Related to the previous points, by cleanly separating the UI layer, you can easily substitute real business logic with simulation and mock business logic.

Single Page Apps improve web services by forcing developers to follow the dogfooding principle; as J Chris Anderson mentions, if the client is using the same API as everyone else, it will help to prove the server-side architecture.

Single Page Apps distribute processing more efficiently. Instead of the server doing all the grunt work, the load is spread out to client machines. This means you free up server resources to do other interesting things and/or use less server resources overall.

Single Page Apps are better equipped to run offline. If your app doesn't need server-side data, or can still degrade so it's useful without it, users will be able to run the app offline. Offline capability is becoming more important with systems like ChromeOS and HTML5-powered mobile apps. This is especially easy with the HTML5 storage capabilities. (localStorage, Indexed DB, Web SQL storage, etc.)

Here are the Ajax drawback I have faced:

1. More exposure to browser internals. If you need something that works across the board you will find it more difficult to support the ever growing crowd or browsers. And while there are frameworks and tools to help you, things are not as straightforward.

2. You have less insight on how your software works in the field. As more things happen on the client and with the practical limits on how much you can deliver back to the server, bugs are more difficult to discover and understand.

3. The client state longevity. As the whole point of this is to keep more state on the client and not move it back and forth over the wire Ajax apps tend to keep more state on the client. This while good for performance does present more challenges to dealing with issues that reproduce under some not so frequent circumstances or after longer period of use. For example memory leaks are of real concern in Ajax apps and are notoriously difficult to deal with.

4. Client side has more limited access to state on the server. In other words, if your apps is state intensive you will have to invest more on deciding how to move this state reasonably between the server and the client.
The longer network lag make the cost of on demand data accessing preventively high and not practical.

To confirm, I assume you mean HTTP?

There may be some header differences, but the main behavior difference is on the client.

When the browser makes a regular request as in window.location.href = "index.html", it clears the current window and loads the server response into the window.

With an ajax request, the current window/document is unaffected and javascript code can examine the results of the request and do what it wants to with those results (insert HTML dynamically into the page, parse JSON and use it the page logic, parse XML, etc...).

The server doesn't do anything different - it's just in how the client treats the response from the two requests.

The below image is also a good explanation if the above wasn’t clear:

img tag Setting attribute loading="lazy" will prevent the image from loading until the user scrolls down to it and it's finally needed on the web page. Hear is an example:

Nyc question buddy .

1. Increased speed :- The main used of Ajax is to improve the speed, performance and usability of a web application.

2. User Friendly:- Ajax helped to make applications will always be more responsive, faster and more user-friendly.

3. Asynchronous Calls: Ajax allows you to make asynchronous calls to a web server

Ajax used JSON . which is the alternative of xml. if you are preparing the question

answer related to technical or non technical . CodingTag CodingTag share the latest asked quesiton answer by any programmer ya recuriter. Which helps to increase the knowledge. thanking you hope you like \.

• Update a web page without reloading the page
• Request data from a server - after the page has loaded
• Receive data from a server - after the page has loaded
• Send data to a server - in the background
• <!DOCTYPE html>

<html>

<body>

<div id="demo">

<h1>The XMLHttpRequest Object</h1>

<button type="button" onclick="loadDoc()">Change Content</button>

</div>

<script>

function loadDoc() {

var xhttp = new XMLHttpRequest();

xhttp.onreadystatechange = function() {

if (this.readyState == 4 && this.status == 200) {

document.getElementById("demo").innerHTML =

this.responseText;

}

};

xhttp.open("GET", "ajax_info.txt", true);

xhttp.send();

}

</script>

</body>

</html>

The HTML page contains a <div> section and a <button>.

The <div> section is used to display information from a server.

The <button> calls a function (if it is clicked).

The function requests data from a web server and displays it:

Function loadDoc()

function loadDoc() {
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
document.getElementById("demo").innerHTML = this.responseText;
}
};
xhttp.open("GET", "ajax_info.txt", true);
xhttp.send();
}

The "ajax_info.txt" file used in the example above, is a simple text file and looks like this:

<h1>AJAX</h1>
<p>AJAX is not a programming language.</p>
<p>AJAX is a technique for accessing web servers from a web page.</p>
<p>AJAX stands for Asynchronous JavaScript And XML.</p>

What is AJAX?

AJAX = Asynchronous JavaScript And XML.

AJAX is not a programming language.

AJAX just uses a combination of:

• A browser built-in XMLHttpRequest object (to request data from a web server)
• JavaScript and HTML DOM (to display or use the data)

AJAX is a misleading name. AJAX applications might use XML to transport data, but it is equally common to transport data as plain text or JSON text.

AJAX allows web pages to be updated asynchronously by exchanging data with a web server behind the scenes. This means that it is possible to update parts of a web page, without reloading the whole page.

How AJAX Works

• 1. An event occurs in a web page (the page is loaded, a button is clicked)
• 2. An XMLHttpRequest object is created by JavaScript
• 3. The XMLHttpRequest object sends a request to a web server
• 4. The server processes the request
• 5. The server sends a response back to the web page
• 6. The response is read by JavaScript
• 7. Proper action (like page update) is performed by JavaScript

Single Page Apps can be slow to download, an obvious consequence of storing everything and the kitchen sink on a single page. You can mitigate that to an extent by having your script download JavaScript and content on demand, though doing so may defeat one of the best things about Single Page Apps - their simplicity. Note that "slow to download" doesn't mean slow to use - speed and zero latency is one of the benefits of Single Page Apps. But the initial payload may be slower.

Single Page Apps have issues with SEO and navigation as others have suggested. On SEO, Google now supports fragment IDs by using the shebang (#!) convention. http://code.google.com/web/ajaxcrawling/. On navigation, there are various tricks to make back button and bookmarking work, but you can now also take advantage of the HTML5 history and hashchange APIs in modern browsers.

Single Page Apps require JavaScript to be present and enabled. This can lead to issues with accessibility and screenreaders (although it's folly to equate "JavaScript" with "not accessible").

Single Page Apps break standard conventions of analytics, ads, and widgets, where tools are typically premised on the idea that users are frequently changing page. You can't trace a session by inspecting the sequence of URLs a user visited in the space of 5 minutes, for example; they only visited one URL. Simply put, your server probably knows nothing about user activity unless you explicitly log it.
Importantly, there are also many upsides of Single Page Apps! But they're not pertinent to this question.

Quora isn’t really a good platform for answering these type of questions, Stackoverflow would be better and you’ll get quicker responses, but, if you wish, use pastebin to post your code and we can take a look.

Since you’re new at this, I won’t “type the code for you”, because that won’t help you in the long run. What I will do though is give you guidance and pointers.

Here’s your first pointer:

Open up Chrome browser, and go to your page that is not working.

Now, open up the developer console (F12) and navigate to the “Network” tab and then “XHR”. Pay particular attention to the Status column — those are your server responses.

If you need further guidance from there, just post a comment to this answer, and we can walk through it as necessary.

Good luck!

That is an interesting question - and I think the answer depends on how well designed the site is.

A well-designed site will make every important resource available via its own canonical URL; even if those resources are normally loaded via ajax. A common business justification for this practice is that it allows search engine robots - which generally do not run JavaScript - to find all of the content on a website. And what is good for robots is good for archiving.

The traditional method of associating URLs with content is to create a special page for each piece of content that can be loaded without JavaScript. Links in the application that display that content have their href attribute pointed to that special page. When the user clicks on one of those links the href might be ignored while the content is loaded and displayed without a page refresh. But a robot would just follow the href. This is called the "parallel universe" of content because the user may never see those special pages. For these types of sites all that you need to do is to is crawl links in the traditional manner.

A more recent idea was recently codified in a Google specification, "http://code.google.com/web/ajaxcrawling/". This is an extension of associating a URL with a hash with some dynamic state of the web application. For example, you might see a URL like this somewhere: http://somesite.com/blog-posts#page=3. Any modern browser can update the portion of the URL after the # while the user is on a page without reloading the page. So that URL can be updated whenever the user does something so that if the user goes back to the same URL they will find themselves at the same spot where they left off. But it is not possible for a robot or an archiver to crawl these URLs because the application state is reconstructed in JavaScript after the page loads. The Google proposal is a convention for mapping such "dynamic" URLs to traditional URLs that can be crawled. Any website that has a bang after the hash (#!) in the URL is probably using this practice. A currently live example is Twitter.

To archive content from one of these sites you will need to read up on the spec to program your archive utility to translate URLs containing a #! appropriately and to replace href values that point to dynamic URLs with their non-dynamic counterparts.

If a site is not well designed and uses a lot of ajax I don't know if there is much that you can do. You might try looking for a sitemap to see if there are crawlable versions of pages on the site that are not linked to for some reason. You can also try using a tool like Selenium to automate clicking on everything on the page and to save whatever you get. But that approach is likely to be more trouble than it is worth. I suppose that your best bet would be to bug the site admin to adopt better web architecture practices. Tell them it is good for SEO and maybe that will be convincing.

If you're just looking to get the source of a webpage, most languages have their own implementation. With php, you can handle webpages as if they are regular files. So you can do page_get_contents('http://example.com’);.

Be aware however that you may not get the same result you would get when retrieving the page from your browser. This is because scripts on the page may alert the dom after it's been retrieved from the server.

If you want to account for that, I'd recommend looking intos selenium webdriver. It's a system to script the actions of a web browser from an outside program. So you can instruct a browser to open a webpage, wait a short while to let scripts finish, and then retrieving the source from the browser.

You asked: “In AJAX, how can we transfer more than one value from HTML forms to JavaScript code using the GET method?”

Thanks for the A2A!

In AJAX, you can use the GET method to send data from an HTML form to a JavaScript script by adding the data as query string parameters to the URL used to make the AJAX request.

For example, suppose you have an HTML form with two input fields, name and email, and a submit button. You can send the values of these fields to a JavaScript script using the GET method by adding them to the URL as query string parameters like this:

<form id="myForm"> Name: <input type="text" name="name"><br> 
 Email: <input type="text"name="email"><br>  
<input type="button" value="Submit" onclick="sendData()">  
</form> 
 
<script> function sendData() { var form = document.getElementById("myForm"); 
 var name = form.elements.name.value;  
var email = form.elements.email.value;  
var xhr = newXMLHttpRequest();  
xhr.open("GET", "myscript.php?name=" + name + "&email=" + email, true); 
 xhr.send(); 
 } 
 </script> 

This will make an AJAX request to the URL myscript.php?name=<name>&email=<email>, where <name> and <email> are the values entered in the form fields. The script myscript.php can then access the values of name and email as $_GET variables.

<?php  
$name = $_GET['name']; 
 $email = $_GET['email']; // do something with the data  
?> 

Note that the GET method has a limit on the amount of data that can be sent, as the URL and query string can only be so long. If you need to send a larger amount of data, you can use the POST method instead.

Selenium used to programatically get an HTML page with dynamic content, even content generated by AJAX requests, and Javascript DOM dynamic modifications. It acts like a normal browser, and you can query DOM elements, like if you are displaying in a real browser.

Selenium - Browser Automation

Also, you can see the examples of code provided for the Selenium team, for example, a Python Script to do a Google Search:

Python Test Setup Example

Also, you can see, for example, some answers in Stack Overflow about “selenium and web scrapping:

How to get data from Ajax request in Selenium? (StackOverflow)

To catch specifically AJAX requests in JSON format, you can use REST Assured or any automated REST client, that allows you to catch the response of a known ajax request, but you know before the request URI for the AJAX request and the parameters to send your request.

REST Assured

The easiest and the best way to scrape AJAX driven website is by using EasyDataFeed. EasyDataFeed is data extraction software.

It is a free desktop application that you can run on demand with one click of a button from your computer, or on a schedule. You can then insert the pricing as well as inventory right into your e-commerce website using Dropbox or FTP.

Once the inventory data has been extracted, it can then sync to all the marketplace channels and POS systems. After extracting the tracking information, it will be emailed to your customers automatically and synced to all marketplace channels. It is working well, always kept updated. Anybody can download it. It is basically used to extract any type of data. We can scrape them easily either that is AJAX driven, or they have JSON too. If you want to get qualitative scraping, I would actually recommend you to contact them. You will save your time, and I think you will also save your money.

Disclosure: I wrote the post.

To render an HTML form in Django, you can use the Django forms module. Here's an example of how you can render a form in Django:

1. Define a form in your Django app's form file:

from django import forms 
 
class MyForm(forms.Form): 
    my_field = forms.CharField() 

2. In your Django view, import the form and pass it to the template context:

from django.shortcuts import render 
from .forms import MyForm 
 
def my_view(request): 
    form = MyForm() 
    return render(request, 'my_template.html', {'form': form}) 

3. Create a template file (`my_template.html`) that renders the form using Django template tags:

<form id="myForm"> 
    {% csrf_token %} 
    {{ form.as_p }} 
    <button type="submit">Submit</button> 
</form> 

Make sure to include the CSRF token (`{% csrf_token %}}`) to protect against Cross-Site Request Forgery attacks.

Now, to post the form data to another website using AJAX, you can utilize JavaScript and the jQuery library. Here's an example using jQuery's `ajax()` method:

1. Include the jQuery library in your HTML template:

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js"></script> 

2. Add a JavaScript code block below the form in your template:

<script> 
    $(document).ready(function() { 
        $('#myForm').submit(function(event) { 
            event.preventDefault(); // prevent normal form submission 
             
            // Collect form data 
            var formData = $(this).serialize(); 
             
            // Send AJAX request 
            $.ajax({ 
                url: 'http://example.com/post-url/', 
                type: 'POST', 
                data: formData, 
                success: function(response) { 
                    // Handle success response 
                    console.log("Form data successfully posted"); 
                    console.log(response); 
                }, 
                error: function(xhr, errmsg, err) { 
                    // Handle error response 
                    console.log("Error occurred while posting form data"); 
                    console.log(xhr.status + ": " + xhr.responseText); 
                } 
            }); 
        }); 
    }); 
</script> 

Make sure to adjust the `url` value in the `$.ajax()` function to the appropriate URL of the website where you want to post the form data.

With this setup, when the form is submitted, the JavaScript code will intercept the form submission event, collect the form data, and send it to the specified URL using an AJAX request. The success and error callbacks can be used to handle the response from the server.

Both Chrome and Firefox come with an ‘Inspect’ feature that shows you lots of developer information including letting you to see the styles that are applied to a particular element. This is great when you are creating complicated layouts and CSS and can really help you learn new techniques. You can just copy the text and paste it into your own editor.

However, please don’t just swipe other people’s templates and designs. They worked hard to put it together, for a specific customer or application and it’s much better if you write your own code to fit whatever it is you are developing.

I have found web developers and coders to be an extremely generous and helpful community. Whatever it is that you’re trying to achieve with HTML/CSS, looking for new techniques, tricks and tips etc, try using Google first - someone will have done a tutorial or explanation. It’s all out there already!

Semantic HTML always makes sense, regardless of whether Ajax is used. The question description highlights a misconception about what "semantic HTML" really is.

First, a definition. Semantic HTML means that the markup being used is descriptive of the type of content that it will hold. A list of items is usually held by a ul or li element. The thing that's semantic about the ul, for example, is that it was designed (by specification) to handle list items (li), both of which conveniently inherit styles specifically made for lists of items.

It doesn't matter where the list data came from: hard-coded in the HTML, filled in by server side templates, dynamically populated via Ajax, etc. The markup is semantic every time.

One possible point of confusion is the dynamic nature of Ajax. There's a degree of uncertainty about the data coming in; we don't quite know what it will contain. However, we should be able to reasonably assume the format of the data. That is, if we're talking to an API to get stories, we can reasonably assume that we're going to get a title, article, etc. A title of an article is probably the most important part, so we know we should assign it to an important HTML element. An h1 sounds most appropriate. HTML5 has the article element, which is also semantically sensible. However we get the data into the elements (pure HTML, PHP/Python, JavaScript), the data will always have a semantic meaning. Developers need to recognize the meaning and assign it to the appropriate corresponding HTML elements.