NET 5. Saturday, August 25, AJAX - Asynchronous Javascript and XML, is a technology that enables web applications to behave more like desktop applications by making asynchronous calls to the server. This eliminates the process of doing a complete page refresh while we need only a small part of the page to be updated.
As we type our search terms in the search box, Google gives us suggestions according to the search terms we type without refreshing the page. You can read more about AJAX technology here.
XMLHttpRequest is the object that does the job behind the scene. In other words, this post will give you an overview on how to implement AJAX calls in Java web applications. I am using JQuery library instead of implementing this in Javascript because it is quite tedious to make it work across all browsers in Javascript and JQuery simplifies this in a single function. Create a Dynamic Web Project in Eclipse. I have named it as "JQueryAjaxDemo".
I have named it as "index. In the index. Copy paste the below code in index. Right click on Source directory and create a new Package. Name it as "ajaxdemo". In this servlet we get the name entered by the user in the jsp page and create a welcome message that includes this name. This is then returned back to the jsp page to be displayed to the user. If no name is typed by the user in the textbox, then it is defaulted to a value called "User".
Copy and paste the below code in 'ActionServlet. Note: If you choose to use a different name for package and servlet, provide the same name for url mapping in the deployment descriptor explained in the next step. Now map the above servlet to an url pattern so that the servlet will be called whenever it matches the specified url pattern. Open web. Last step is to run this project.
Right Click on index. Use your default web browser and avoid using internal web browser that is in-built in Eclipse. Now on the web page the user will be prompted to enter a name and on clicking the "Ajax Submit" button, the user will now see a welcome message saying "Hello UserName ".
This is all done asynchronously and you will not see a page refresh whenever the user clicks on the "Ajax Submit" button. When the user clicks on "Ajax Submit" button, button click event is fired and the 'get' function executes the Ajax GET request on the Servlet ActionServlet in the above example. The second argument of the get function is a key-value pair that passes the input value from JSP page to Servlet.
The third argument is a function that defines what is to be done with the response that is got back from the servlet. For better understanding download the source code of the above example from the below link and run it yourself with small alterations in the Servlet and JSP page. If you want to add more dynamics and return other Java objects such as list, map, etc.
I am aiming to provide a simple example for this in my upcoming post. Please leave your comments and queries about this post in the comment sections in order for me to improve my writing skills and to showcase more useful posts. Posted by Unknown. Like to share? Related Jquery Newer Post Older Post Home item. Anonymous 21 October at Unknown 22 October at Dilesh kumar 5 January at Vinicius 1 November at Unknown 1 November at Vinicius 5 November at Unknown 7 November at Unknown 28 November at Anonymous 12 December at Unknown 14 December at Unknown 15 December at SPRS 17 February at Unknown 18 December at Unknown 19 December at Unknown 22 December at Unknown 31 December at Unknown 1 January at Unknown 2 January at Thais 24 January at Unknown 15 February at Unknown 25 February at Unknown 26 February at Unknown 2 March at Unknown 4 March at Unknown 6 March at Unknown 7 March at Unknown 9 March at Unknown 10 March at Unknown 8 March at Valon 10 March at Valon 11 March at Unknown 12 March at Unknown 18 March at Unknown 22 March at Unknown 24 March at Unknown 8 May at Yasassri 12 May at Unknown 13 May at Yasassri 13 May at Unknown 1 June at Unknown 8 June at Unknown 4 June at Unknown 10 June at Unknown 11 June at Srinivas K 13 June at Lindberg 28 June at Unknown 6 August at Raanan Jossefi 15 August at Unknown 12 September at Unknown 7 October at Unknown 4 September at Mohan Raj 18 November at Unknown 18 November at Unknown 6 December at Saketh 19 February at Unknown 9 February at JBK 11 May at Sankar 29 October at Unknown 25 December at Renuraj 2 September at Anonymous 11 October at Venkatesh CS 7 November at Chris Hemsworth 10 November at Reshma 19 December at Android Training in Jaipur 10 April at Unknown 29 August at Jee 21 October at Anu 23 October at Huongkv 10 November at Ashok 14 November at Anonymous 20 November at Ashok 20 November at Kashi Digital Agency 29 November at Reshma 17 December at Josh 19 January at Franklin 19 January at Nivetha 2 February at Arefa Akter 14 February at All Government Job 19 February at Huongkv 24 February at Anonymous 3 March at Jon Hendo 4 March at Anonymous 9 March at Shivam Kumar 13 March at James Yadiel Jose 15 March at Unknown 16 March at Michael L Catudal 20 March at Michael Catudal 27 March at Anonymous 1 April at Jackets In Leather 2 April at Marty Sockolov 3 April at Sergey Brin 7 April at Unknown 8 April at Jackets In Leather 15 April at Kim 22 April at R1club 23 April at Mallela 26 April at RK 30 April at Helge Erik 4 May at Maradona Jons 8 May at Achieversit 9 May at Jhon james 10 May at Rekhafirstblogger 13 May at Achieversit 16 May at Snehal Harshe 22 May at View Demo.
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