Wednesday, March 15, 2017

JSON – Objects



-                    Creating Simple Objects:

JSON objects can be created with JavaScript. Let us see the various ways of creating JSON objects using JavaScript −
  • Creation of an empty Object −
var JSONObj = {};
  • Creation of a new Object −
var JSONObj = new Object();

·        Creation of an object with attribute bookname with value in string, attribute price with numeric value. Attribute is accessed by using '.' Operator –
·         var JSONObj = { "bookname ":"VB BLACK BOOK", "price":500 };

·         This is an example that shows creation of an object in javascript using JSON, save the below code as json_object.htm –

·         <html>
·            <head>
·               <title>Creating Object JSON with JavaScript</title>
·          
·               <script language = "javascript" >
·          
·                  var JSONObj = { "name" : "tutorialspoint.com", "year"  : 2005 };
·                   
·                  document.write("<h1>JSON with JavaScript example</h1>");
·                  document.write("<br>");
·                  document.write("<h3>Website Name = "+JSONObj.name+"</h3>"); 
·                  document.write("<h3>Year = "+JSONObj.year+"</h3>"); 
·          
·               </script>
·                   
·            </head>
·          
·            <body>
·            </body>
·          
·         </html>
Now let's try to open Json Object using IE or any other javaScript enabled browser. It produces the following result –


-                    Creating Array Objects:

The following example shows creation of an array object in javascript using JSON, save the below code as json_array_object.htm 
<html>
   <head>
      <title>Creation of array object in javascript using JSON</title>
                 
      <script language = "javascript" >
 
         document.writeln("<h2>JSON array object</h2>");
 
         var books = { "Pascal" : [ 
            { "Name"  : "Pascal Made Simple", "price" : 700 },
            { "Name"  : "Guide to Pascal", "price" : 400 }],  
                                   
            "Scala"  : [
               { "Name"  : "Scala for the Impatient", "price" : 1000 }, 
               { "Name"  : "Scala in Depth", "price" : 1300 }]    
         }    
 
         var i = 0
         document.writeln("<table border = '2'><tr>");
                          
         for(i = 0;i<books.Pascal.length;i++){      
            document.writeln("<td>");
            document.writeln("<table border = '1' width = 100 >");
            document.writeln("<tr><td><b>Name</b></td><td width = 50>" + books.Pascal[i].Name+"</td></tr>");
            document.writeln("<tr><td><b>Price</b></td><td width = 50>" + books.Pascal[i].price +"</td></tr>");
            document.writeln("</table>");
            document.writeln("</td>");
         }
 
         for(i = 0;i<books.Scala.length;i++){
            document.writeln("<td>");
            document.writeln("<table border = '1' width = 100 >");
            document.writeln("<tr><td><b>Name</b></td><td width = 50>" + books.Scala[i].Name+"</td></tr>");
            document.writeln("<tr><td><b>Price</b></td><td width = 50>" + books.Scala[i].price+"</td></tr>");
            document.writeln("</table>");
            document.writeln("</td>");
         }
                          
         document.writeln("</tr></table>");
 
      </script>
 
   </head>
         
   <body>
   </body>
         
</html>

Now let's try to open Json Array Object using IE or any other javaScript enabled browser. It produces the following result –

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