Category: AJAX

Top 50 Ajax Interview Questions with Answers

by Ashwani KumarAJAXLeave a Comment on Top 50 Ajax Interview Questions with Answers
Ajax Interview Questions with Answers

1. What is AJAX?

A. A programming language
B. A web development technique
C. A database management system

Answer: B

2. What is the full form of AJAX?

A. Asynchronous JavaScript and XML
B. Asynchronous JavaScript and XHTML
C. Asynchronous JavaScript and JSON

Answer: A

3. What is the main advantage of using AJAX?

A. Improved page load time
B. Improved database performance
C. Improved server response time

Answer: A

4. Which HTTP request method is used in AJAX?

A. GET
B. POST
C. Both A and B

Answer: C

5. Which object is used to create an AJAX request?

A. XMLHttpRequest
B. JSONRequest
C. AjaxRequest

Answer: A

6. What is the role of JSON in AJAX?

A. To store data
B. To retrieve data
C. To exchange data

Answer: C

7. Which function is used to send an AJAX request?

A. xhr.send()
B. xhr.open()
C. xhr.onload()

Answer: A

8. Which function is used to handle AJAX response?

A. xhr.onload()
B. xhr.open()
C. xhr.send()

Answer: A

9. Which HTML tag is used to create an AJAX application?

A.
B.
C.

Answer: C

10. Which file is used to handle AJAX requests in PHP?

A. ajax.php
B. ajax_handler.php
C. any PHP file can handle AJAX requests

Answer: C

11. Which function is used to encode a JavaScript object into JSON format?

A. JSON.format()
B. JSON.encode()
C. JSON.stringify()

Answer: C

12. Which function is used to decode a JSON string into a JavaScript object?

A. JSON.parse()
B. JSON.decode()
C. JSON.object()

Answer: A

13. Which method is used to append data to a form before submitting it using AJAX?

A. xhr.append()
B. xhr.send()
C. FormData.append()

Answer: C

14. How can you handle errors in AJAX requests?

A. Using try-catch block
B. Using xhr.onerror()
C. Both A and B

Answer: C

15. Which web development framework has built-in support for AJAX?

A. React
B. AngularJS
C. jQuery

Answer: C

16. What is the purpose of the XMLHttpRequest.readyState property in AJAX?

A. To indicate the status of the AJAX request
B. To handle AJAX response
C. To create an AJAX request

Answer: A

17. Which HTTP status code indicates a successful AJAX request?

A. 200
B. 400
C. 500

Answer: A

18. Which method is used to cancel an AJAX request?

A. xhr.cancel()
B. xhr.abort()
C. xhr.stop()

Answer: B

19. Which method is used to set a timeout for an AJAX request?

A. xhr.timeout()
B. xhr.setOnTimeout()
C. xhr.ontimeout()

Answer: C

20. Which method is used to disable caching for an AJAX request?

A. xhr.disableCache()
B. xhr.setRequestHeader()
C. xhr.cache(false)

Answer: B

21. What is the syntax for creating an AJAX request using jQuery?

A. $.ajax(url, options)
B. $.getJSON(url, data)
C. $.post(url, data)

Answer: A

22. Which method is used to set the data type of an AJAX response in jQuery?

A. dataType()
B. responseType()
C. contentType()

Answer: A

23. Which property is used to access the response data in an AJAX request using jQuery?

A. data
B. responseText
C. responseJSON

Answer: A

24. Which method is used to serialize a form data in jQuery?

A. serializeForm()
B. serializeObject()
C. serialize()

Answer: C

25. Which method is used to submit a form using AJAX in jQuery?

A. ajax()
B. submit()
C. post()

Answer: A

26. What is the syntax for creating an AJAX request using React?

A. fetch(url, options)
B. axios(url, options)
C. XMLHttpRequest(url, options)

Answer: B

27. Which method is used to handle errors in an AJAX request using React?

A. onError()
B. onFailure()
C. catch()

Answer: C

28. What is the purpose of the withCredentials property in AJAX requests?

A. To enable cookies in cross-domain requests
B. To set the credentials for authentication
C. To enable HTTPS requests

Answer: A

29. Which method is used to enable cross-domain requests in AJAX?

A. xhr.enableCORS()
B. xhr.crossDomain()
C. xhr.setRequestHeader()

Answer: C

30. What is the syntax for creating an AJAX request using AngularJS?

A. $http.get(url, options)
B. $ajax(url, options)
C. $xhr(url, options)

Answer: A

31. Which method is used to handle an error in an AJAX request using AngularJS?

A. error()
B. catch()
C. failure()

Answer: A

32. What is the purpose of the transformRequest function in AngularJS AJAX requests?

A. To transform the request data before sending
B. To transform the response data after receiving
C. To transform the HTTP headers

Answer: A

33. What is the purpose of the transformResponse function in AngularJS AJAX requests?

A. To transform the request data before sending
B. To transform the response data after receiving
C. To transform the HTTP headers

Answer: B

34. Which method is used to cancel an AJAX request in AngularJS?

A. $cancel()
B. $abort()
C. $http.abort()

Answer: A

35. What is the syntax for creating an AJAX request using Vue.js?

A. axios(url, options)
B. $xhr(url, options)
C. fetch(url, options)

Answer: A

36. Which method is used to handle an error in an AJAX request using Vue.js?

A. onError()
B. onFailure()
C. catch()

Answer: C

37. What is the purpose of the beforeRequest hook in Vue.js AJAX requests?

A. To modify the request before sending
B. To modify the response after receiving
C. To modify the HTTP headers

Answer: A

38. What is the purpose of the afterResponse hook in Vue.js AJAX requests?

A. To modify the request before sending
B. To modify the response after receiving
C. To modify the HTTP headers

Answer: B

39. Which method is used to cancel an AJAX request in Vue.js?

A. $cancel()
B. $abort()
C. axios.cancel()

Answer: A

40. Which HTTP headers are used to enable caching in AJAX requests?

A. Cache-Control and Expires
B. Last-Modified and ETag
C. Both A and B

Answer: C

41. What is the purpose of ETag header in HTTP responses?

A. To store cached data
B. To enable caching for dynamic content
C. To validate cached data

Answer: C

42. What is the difference between synchronous and asynchronous AJAX requests?

A. Synchronous requests are faster than asynchronous requests
B. Asynchronous requests do not block the UI thread
C. Synchronous requests do not require a callback function

Answer: B

43. What is the purpose of CORS in AJAX requests?

A. To enable cross-domain requests
B. To disable cross-domain requests
C. To validate cross-domain requests

Answer: A

44. Which web security vulnerability is associated with AJAX?

A. Cross-site scripting (XSS)
B. Cross-site request forgery (CSRF)
C. SQL injection

Answer: B

45. What is the purpose of using a nonce in AJAX requests?

A. To prevent CSRF attacks
B. To enable caching
C. To improve server performance

Answer: A

46. Which method is used to encrypt AJAX requests over HTTPS?

A. xhr.encrypt()
B. xhr.setSSL()
C. xhr.setRequestHeader()

Answer: C

47. What is the purpose of the HTTP referer header in AJAX requests?

A. To trace the origin of the request
B. To identify the user agent
C. To set the caching policy

Answer: A

48. What is the purpose of the HTTP user agent header in AJAX requests?

A. To trace the origin of the request
B. To identify the user agent
C. To set the caching policy

Answer: B

49. Which method is used to detect the presence of an AJAX request in JavaScript?

A. xhr.detect()
B. xhr.status()
C. xhr.readyState()

Answer: C

50. Which web development standard is used for AJAX requests?

A. HTTP
B. XML
C. JSON

Answer: A

How to create custom pagination without datatable in laravel microservice

by Rakesh KAJAX / LaravelLeave a Comment on How to create custom pagination without datatable in laravel microservice

Step 1:create button input in blade file

Step 2: declare variable like curtpage, pagelimit and total record

when you click the button then apply business logic inside jquery/javascript function

Step 3: when we get data after ajax success function then apply logic

Step 4: set routing in client side

Route::prefix(‘/touroperator’)->group(function () use ($namespace) {

Route::get('iternarydetail/{email}',"$tourcontroller@getiternary");

});

Step 5: get token and client id in client side controller using function

Step 6: set env and config flie

GET_MYHOLIDAYITERNARY_URL=/api/v1/j/iternarydetail

Step 6:set Routing in server side

 Route::get(‘iternarydetail/{email}’, ‘Admin\AdminTPController@iternarydetail’);

Step 7: apply pagination query inside sever side controller function

finally output view looks like

Tagged : /

How to set a selected option using ajax in Laravel 5.6?

by Chandan KumarAJAX / LaravelLeave a Comment on How to set a selected option using ajax in Laravel 5.6?

Hey friends, I am trying to show database column data in my edit form of a Laravel project. yesterday I failed to show data from database in a select list using ajax. so let’s see the below blade file and ajax also to get your solution.

edit.blade.php 
<div class="form-group">
  <label for="Blood_Group">Blood Group</label>
	<select class="form-control" id="bgroup" name="bgroup">
	  <option value="" disabled selected>Select BG</option>
	  <option value="O+">O+</option>
	  <option value="O-">O-</option>
	  <option value="A+">A+</option>
	  <option value="A-">A-</option>
	  <option value="B+">B+</option>
	  <option value="B-">B-</option>
	  <option value="AB+">AB+</option>
	  <option value="AB+">AB-</option>
	</select>
</div>
profile.js
$.ajax({
	type: "GET",
	url: 'addprofile',
	data: null,
	success: function(response) {
          let data = response.data;
          $("#bgroup").append('<option value=' + data[0].bgroup+ '>' + data[0].bgroup+ 
           '</option>');

        }
});

Error : updated data from database is not showing in selected list when i am trying to update it again.

Solution :
$("#bgroup").val(data[0].bgroup).attr('selected','selected');

You can also use below code:

$('#bgroup option[value="' + data[0].bgroup+ '"]').prop('selected', true);

Above solution is working for me. so if you have more solution on select option then please feel free to comment and share your knowledge.

Resources :

  1. Click here
  2. Click here

Tagged : / / / /

AJAX Setup/ Installation

by abhishek kAJAX / Websites1 Comment on AJAX Setup/ Installation

Ajax is a web development technique designed to create highly responsive/ interactive websites. To have a better understanding of AJAX we need to have knowledge of javascript and somewhat XML.

The easiest way of implementing AJAX, is by using jQuery.

To add jQuery

We can use the downloaded version from (jquery.com/download/) and we need to include the file location of the file in the script under the header tag, or we can use the CDN in the head of HTML as 

<head>

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>

</head>

After we are good to go with the operations we need to perform. If we wanna test that the CDN works fine we can use the function below in the body of the HTML script 

<script>
$(document).ready(function(){
    alert("jQuery Works")
});
</script>

If we see the jQuery works alert, That mean we can congratulate ourselves on our success.

For knowing what is AJAX and its procedure https://www.scmgalaxy.com/tutorials/a-brief-description-of-ajax/

Tagged : / / /

A Brief Description of AJAX

by abhishek kAJAX / Websites1 Comment on A Brief Description of AJAX

AJAX stands for Asynchronous JavaScript And XML.

It is a web development technique that helps to create a highly responsive website. by the use of AJAX, we get desktop-like software experience on the web browser. It is used in the web pages to be updated asynchronously by changing data with a web server behind the scene (in the background). This makes it possible to update parts of a web page, without reloading the whole page. It is the use of the XMLHttpRequest object to communicate with server-side scripts.

The easiest way of implementing AJAX, especially if we’re planning on communicating with servers is by using jQuery.

Most people get confused with the concept that ajax is a programming language. So, let’s be very clear that

Ajax is not a programming language, it is a web development technique designed to create highly responsive/ interactive websites. To have a better understanding of AJAX we need to have knowledge of javascript and somewhat XML.

Javascript is a scripting language that helps to make web pages interactive, CSS (Cascading style sheet) style sheet to the makeup of the webpage and XML (extensible markup language ) is a markup language that defines a set of rules for encoding documents in a format that is both human-readable and machine-readable. here javascript and CSS are essentials and XML is less essential for the beginners

Why use AJAX

  1. A whole page reload is not required on each request made.
  2. Sends and receives data in the background.
  3. Improves speed and performance.
  4. Provides a better user experience.

How AJAX works

Ajax uses XMLHttpRequest object (also called XHR objects) to achieve this

  1. When the user sends a request from the interface then the javascript directs to the XMLHttpRequest object.
  2. Then the HTTP Request is made to the server by XMLHttpRequest object.
  3. Then the server interacts with the database using the JSP, PHP, Servlet, ASP.net, etc.
  4. When there is a match for the request then the Data is retrieved from the database.
  5. Then the Server sends XML data or JSON data to the XMLHttpRequest callback function.
  6. Finally, when all the things are good to go then the web-page made (with HTML and CSS) is displayed on the browser.
How AJAX works

For knowing the installation/setup procedure link is given below https://www.scmgalaxy.com/tutorials/ajax-setup-installation/

Tagged : / /