CoffeeScript - Ajax


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AJAX is a web development technique for creating interactive web applications.

  • AJAX stands for Asynchronous JavaScript and XML. It is a new technique for creating better, faster, and more interactive web applications with the help of XML, HTML, CSS, and Java Script.

  • Ajax uses XHTML for content, CSS for presentation, along with Document Object Model and JavaScript for dynamic content display.

  • Conventional web applications transmit information to and from the server using synchronous requests. It means you fill out a form, hit submit, and get directed to a new page with new information from the server.

  • With AJAX, when you hit submit, JavaScript will make a request to the server, interpret the results, and update the current screen. In the purest sense, the user would never know that anything was even transmitted to the server.

  • XML is commonly used as the format for receiving server data, although any format, including plain text, can be used.

  • AJAX is a web browser technology independent of web server software.

  • A user can continue to use the application while the client program requests information from the server in the background.

In general, we use jQuery to work with Ajax. Following is an example of Ajax and jQuery

<html>

   <head>
      <title>The jQuery Example</title>
      <script type = "text/javascript"
         src = "https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
		
      <script type = "text/javascript" language = "javascript">
         $(document).ready(function() {
            $("#driver").click(function(event){
               $('#stage').load('/jquery/result.html');
            });
         });
      </script>
   </head>
	
   <body>
	
      <p>Click on the button to load /jquery/result.html file −</p>
		
      <div id = "stage" style = "background-color:cc0;">
         STAGE
      </div>
		
      <input type = "button" id = "driver" value = "Load Data" />
		
   </body>
	
</html>

Here load() initiates an Ajax request to the specified URL /coffeescript/result.html file. After loading this file, all the content would be populated inside <div> tagged with ID stage. Assuming that our /jquery/result.html file has just one HTML line −

<h1>THIS IS RESULT...</h1>

When you click the given button, then result.html file gets loaded.

CoffeeScript with Ajax

We can rewrite the above example using CoffeeScript as shown below.

<html>

   <head>
      <title>The jQuery Example</title>
      <script type = "text/javascript"
         src = "https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
      <script src="http://coffeescript.org/extras/coffee-script.js"></script>
        
      <script type="text/coffeescript">
        $(document).ready ->
          $('#driver').click (event) ->
            $('#stage').load '/jquery/result.html'
            return
          return
      </script>
   </head>
	
   <body>
	
      <p>Click on the button to load /jquery/result.html file -</p>
		
      <div id = "stage" style = "background-color:cc0;">
         STAGE
      </div>
		
      <input type = "button" id = "driver" value = "Load Data" />
		
   </body>
	
</html>


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