DigiMantra » JSON http://www.digimantra.com Technology tips for all Fri, 16 Jul 2010 06:28:42 +0000 en hourly 1 http://wordpress.org/?v=3.0 Using JSON with PHP, javascript |Tutorial 1 http://www.digimantra.com/technology/using-json-with-php-javascript-tutorial-1/ http://www.digimantra.com/technology/using-json-with-php-javascript-tutorial-1/#comments Sat, 15 Nov 2008 14:07:14 +0000 Sachin Khosla http://realin.co.in/?p=153
  • Check username availability and validation using ajax,php
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    • ]]>     Hi Programmers,

    Heard about JSON, and wandering how the hell you gonna implement it with PHP. And why would one use JSON when you have ajax and other alternatives. Well first of to understand JSON, i would recommend you to go through the JSON introduction part which i covered in my earlier post.

    Now coming straight to the point, i am gonna cover the following things in this post

    1) Prepare JSON string using php using json_encode() and send it to client side

    2) Make the object from JSON string using eval()

    3) Use this Object at client side using javscript.

    $array=array(	a=>"One",
				b=>"Two",
				c=>"three"
			);
$json=json_encode($array);

    The above php code, encodes an array of php into JSON string. That means this string can be sent to the client side and is a useful data for us. This data can be anything you like. You can pull this data from the database and then can manipulate at the client side as required using javascript. The function json_encode, encodes the given array in the JSON format. I have stored the string in the varibal $json and then embeded in the html using hidden field, shown below.

    <html>
<head>
<title> JSON with Realin</title>
<script type="text/javascript">
function parseMe(){
var json=document.getElementById("json_text").value;
 
var obj=eval('('+json+')');
document.createElement("ul");
for(val in obj){
	alert(obj[val]);
}
 
}
</script>
</head>
<body>
 
<form>
<input type="hidden" id="json_text" value='<?php echo $json; ?>' />
<input type='button' value="parse" onclick="parseMe();" />
</form>
</body>
</html>

    The above HTML has the value of that JSON string in the hidden field. If you are using some sorta template engine then you can assign this string the variable used in your template engine. For example in fast template i will do, $templateobject->assign(‘JSON_OBJ’,$json);

    This data can be used as you want to, very soon i will post a blog entry which lets you sort the table data using this JSON data.

    Leave comments,

    Cheers !!

    Realin !

    Related posts:

    1. Check username availability and validation using ajax,php
    2. is_object function for javascript
    3. What exactly JSON is ?

    ]]>     http://www.digimantra.com/technology/using-json-with-php-javascript-tutorial-1/feed/ 3     What exactly JSON is ? http://www.digimantra.com/technology/what-exactly-json-is/ http://www.digimantra.com/technology/what-exactly-json-is/#comments Wed, 24 Sep 2008 16:52:37 +0000 Sachin Khosla http://realin.co.in/?p=46
  • Using JSON with PHP, javascript |Tutorial 1
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    • ]]>     Heard the term JSON and wondered what it is ? Well you should be its growing up these days and at first it seems like it is just another framework like jquery or some library in javascript. But let me tell you its something you might want to use more often :)

    json160 What exactly JSON is ?

    What does it stand for ?

    JavaScript Oject Notation

    What does it do ?

    It is a collection of name value pairs, and is easily readable by human and machines. It is completely machine/language independent. It more like XML but is very different in syntax.

    A snippet from JSON code

    {"realin": {
 
"blog":[
 
{"name": "Your Tech Dose",
 
"url": "http://realin.co.in"
 
},
 
{"name": "Sachin Khosla",
 
"profession": "software engineer"
 
}],
 
"belongs":[
 
{"place":"Delhi/India",
 
"Status": "Citizen"
 
}]
 
}}

    So you see you can easily understand what this is all about. If we extract the symbols then there are 4 basic symbols used in here Squiggles, Square,colons and comma

    Squiggles ( { ) acts as container

    Square ( [ ) as usual holds arrays

    colons ( : ) seperates the name value pair

    comma ( , ) seperates the array values

    XML and JSON are they alike ?

    Well i must say yes, and reason being :

    1. Both them are human readable and descriptive as in what they are.
    2. Both have a hierarchal descriptive order
    3. Both are language independent
    4. Both can be used with AJAX

    Did someone say XML and JSON are different ?

    XML have angular bracket representation like html

    XML can be tedious, where as writing JSON is like a regular code writing

    …. can’t think more of it for now :P

    Is it client or server side ?
    PHP supports JSON extension and many other language too, you can find a list here

    And ofcourse it is supported at client side

    Here we end ..

    So why you should choose JSON over XML, well i must say that JSON is quicker than XML because you avoid writing handwritten XML.

    Cheers !!

    Realin !

    Related posts:

    1. Using JSON with PHP, javascript |Tutorial 1
    2. PHP Interview for Beginners/Novice/Freshers | Part 1
    3. Get data from a URL using cURL PHP

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