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Wednesday, 13 May 2015

What is JSON?

JavaScript Object Notation (JSON) is a lightweight data-interchange format inspired by the object literals of JavaScript. 

JSON values can consist of:

  •   objects (collections of name-value pairs)
  •   arrays (ordered lists of values)
  •   strings (in double quotes)
  •   numbers
  •   true, false, or null

JSON is language independent.

JSON with PHP?

   After PHP Version 5.2.0, JSON extension is decodes and encodes functionalities as default.

  • Json_encode     - returns the JSON representation of values
  • Json_decode     - Decodes the JSON String
  • Json_last_error - Returns the last error occured.

JSON Syntax and Rules?

   JSON syntax is derived from JavaScript object notation syntax:


  • Data is in name/value pairs
  • Data is separated by commas
  • Curly braces hold objects
  • Square brackets hold arrays

JSON Example

    This example is simple phone number validation and once phone number has validated , it will be sent this php page, there we are using the json format related encode data.

Html Page:
  
<html>
<head>
<title>JSON Example in Php</title>
<script src="js/jquery-1.11.0.min.js"></script>
</head>
<body>
<h1>Json Basic Example</h1>
<form name="phone-form" method="post" onsubmit="return validation();">
 <input type="text" name="phone" id="phone" value="" >
 <input type="submit" value="submit" >
</form>
<div id="outputDisplay"></div>


Javascript Function


<script>
function validation(value){ 
 //Phone Number Validations
 var phone   = $('#phone').val();
 var specialDigitPattern  = /[~`!@#\$%\^&\*()\-_\+=|\\{}\[\]:;"'<>,\?\/\.0123456789]/;
 //var mailvalidateregex  = /^([a-zA-Z0-9_.+-])+\@(([a-zA-Z0-9-])+\.)+([a-zA-Z0-9]{2,4})+$/;  email validation
 if(phone == ""){
  alert("Please enter the phone ");
  return false;
 }else if(isNaN(phone)){
  alert('Please Enter Valid Phone Number');
  return false;
 }
 
 var postdata  = 'phone='+phone;
 var url   = 'testphone.php?phone='+phone;
 
 $.ajax({
  type  : "POST",
  url   : url, 
  data  : postdata,
  dataType : "json",
  success  : phonestatus_check,
 });
 return false;
}

function phonestatus_check(response){
 if(response.status == 1){
  alert('success');
  $("#outputDisplay").css("color","green");
  $("#outputDisplay").html(response.message);
 }else{
  alert('failure');
  return false;
 }
}
//ends
</script>



Php Page:

<?php
 if(isset($_POST['phone'])){
  $phonenumber = $_POST['phone'];
  $responsearray = array();$responsestatus = '1';
  if($responsestatus == 1){
      $responsearray = array('status' => 1,'message'=> 'Thanks for submitting the Phone Number');
  }else{
   $responsearray = array('status' => 0,'message'=> 'failure');
  }
  echo json_encode($responsearray);
  /* $json = json_encode($responsearray);
  if($_GET['jsoncallback'])
   exit("{$_GET['jsoncallback']}($json)"); */
 }
?>

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