Ajax is a group of technologies that enable a website to submit asynchronous demands to a server. This means that a website does not need to be completely reloaded to retrieve or submit data to the web server, allowing for speedier interactions.
- Synchronous requests are used by traditional web applications to send and receive data to & from the server. It means that once users submit a form, users will be redirected to a fresh page with updated data from the webserver.
- Whereas XML is the most typical format for collecting server data, every format, even plain text, could be utilized.
How does Ajax work?
- When a user does an action on a web page, such as clicking a button.
- The HTTPRequest object is set up with the query parameter and transmitted to the website through XMLHTTPRequest and over the web.
- An asynchronous connection to the network is made with XMLHTTPRequest.
- A servlet and an activity listener execute the client’s request on the web server, such as data fetched from the databases. In the form of an XML document, the answer is constructed using the required information.
- An XMLHTTPRequest object collects input, processes it, and modifies the HTML DOM to show the page with the updated data given by the customer while using the push callback feature.
When Should You Use Ajax?
Ajax could be utilized in any online project where little data are saved and received from the network without having to reload the full page. Data quality on submit actions is a nice illustration of this. Another illustration is changing the contents in the drop-down list-box dependent on some other inputs, like state & college lists. Each college list box should regenerate with only universities & colleges within this state after the customer chooses a state.
Another good illustration is when a user wants to save and receive session settings on the server depending on the user’s choice, such as an item’s height, width, or location. Changing the width might trigger a callback to a server, which would create the current width’s session parameter. The server can then alter the object’s width depending on this session parameter every time the page is reloaded. Instead, the object will revert to its original width.
Ajax’s Important Features
- It improves the speed of a website.
- Unaffected by server technology.
- Improve the web page’s speed.
- Live data linking is supported.
- Data Views control is supported.
- Client-side template loading is supported.
- Customer interfaces that are both rich & responsive
- Server resources are used more sparingly.
- No need to refresh the entire webpage after pressing the submit button.
- And no requirement to reload the entire page; just the section that needs to be refreshed is reloaded.
- Create web applications that are faster as well as more engaging by using ajax.
Ajax Interview Question With Sample Answers
- Q1. What exactly is Ajax?
- Q2: What are Ajax applications, and what do they do?
Ajax uses browser-based apps & separate platform apps
- Q3: How many triggers seem to be available in the update panel?
The updated panel contains two sorts of triggers:
- PostBackTrigger – operates as a complete postback and does not operate asynchronously.
- AsyncPostBackTrigger — Asynchronous partial postback.
- Q4: What is the DLL name which includes the toolkit Ajax control?
Ajaxcontroltoolkits.dll are the DLLs that you can obtain through the Internet using Ajax control toolkits. You can insert this into the toolbox and manually copy it in your bin directory.
- Q5: What is the panel update?
A server controller is an updating panel intended for the web page’s section. When using the update panel, Scripting Manager should be used. The user cannot manage external controls by using the update panel.
- Q6: What is JSON and how does it relate to Ajax?
- Q7: Does Ajax say it is a tool for technology and an architectural theme
The technology & architecture are supported by Ajax.
- Q8: How do you debug AJAX apps?
Debugging is done with two tools:
- Fiddler for Internet Explorer
- Mozilla’s Firebug.
- Q9: What do you mean by Script Manager?
- Q11: Can Ajax work in a different language?
Definitely, Java is an excellent AJAX suit! Users can develop an AJAX consumers page and receive AJAX requests using Java Commercial Version Servers, modifying server countries for AJAX consumers, and joining AJAX users for their business. The dimension update of JavaServer is indeed a premium suit to delineate as well as utilize AJAX additives.
- Q12: In AJAX, what does it mean to make the synchronous request?
AJAX uses synchronous as well as asynchronous requests depending on the website server’s demand priorities. They should be set up carefully so that the server responds to the customers’ requirements. While requesting to continue with the first stage of the script processing, the synchronous request pauses for the site’s response, which is important in a quick reaction mechanism. To keep the server accessible, this must be presented regularly. Asynchronous request technique should be utilized whenever it is necessary or inevitable.
- Q13: What are the drawbacks of using Ajax?
Users of AJAX face few drawbacks:
- Cannot browse between different page states using the forward as well as back buttons.
- Users are unable to bookmark specific states in this application.
- Q14: What is the best way to terminate the Ajax request?
When a customer takes an action that initiates an Ajax request, an existing request is terminated. It could be demonstrated using auto-complete capability for a search box which allows customers to be assisted with similar search phrases depending on their present input by sending such an AJAX request every time they enter a button in the search field.
- Q15: What is the update panel and how does it work?
A server control that updates the part of the web page is utilized to refresh the update panel. While using the update panel, make sure to be using Script Manager. The client could not use external controls with the update panel.
Also read Web API Interview Questions and Sample Answers