CS HOT TOPICS

Friday, December 12, 2014

How to Validate Image Extension in JavaScript ?

<!DOCTYPE>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Image extension validation in javascript</title>
<script type="text/javascript">
function checkExtension(filename)
{
 var n= filename.lastIndexOf(".");
 if(n != -1) //which means filename has . 
 {
  var st= filename.substring(n);
  if(st==".jpg" || st==".jpeg" || st==".png" || st==".gif")
  { //correct extension
   return true;
  }
   else
   { 
    //incorrect extension
   return false;
   }
 }
 else
 {
  //filname don't contains .
  return false;
 }
}
function check()
{
 var fname=document.frm.filename.value;
 if(fname=='')
 {
 alert('select image')
 return false;
 }
 else if(checkExtension(fname))
 return true;
 else 
 {
  alert('Invalid image file. Should be a image !!!')
 return false;
 }
}
</script>
</head>

<body>
<h1 align="center">Image extension validation in javascript.</h1>
<div align="center">
<form name="frm" onsubmit="return check()" method="post" action="go.html">
Select File: 
<input type="file" name="filename" id="filename" />
<br/> <br/>
<input type="submit" />
</form>
</div>
</body>
</html>

Thursday, November 27, 2014

simple pagination in php

Below is the code to do a simple pagination in php:

<?php
$dbhost = 'localhost';
$dbuser = 'root';
$dbpass = '';
$rec_limit = 5;

$conn = mysql_connect($dbhost, $dbuser, $dbpass);
if(! $conn )
{
  die('Could not connect: ' . mysql_error());
}
mysql_select_db('mydatabase');
/* Get total number of records */
$sql = "SELECT count(prd_code) as count_prd FROM Product_tab";
$retval = mysql_query( $sql, $conn );
if(! $retval )
{
  die('Could not get data: ' . mysql_error());
}
$row = mysql_fetch_array($retval );
$rec_count = $row['count_prd'];

if( isset($_GET{'page'} ) )
{
   $page = $_GET{'page'} + 1;
   $offset = $rec_limit * $page ;
}
else
{
   $page = 0;
   $offset = 0;
}
$left_rec = $rec_count - ($page * $rec_limit);

$sql = "SELECT prd_code,prd_name,prd_price from product LIMIT $offset, $rec_limit";

$retval = mysql_query( $sql, $conn );
if(! $retval )
{
  die('Could not get data: ' . mysql_error());
}
while($row = mysql_fetch_array($retval))
{
    echo "Product id :{$row['prd_code']}  <br> ".
      "Product name :{$row['prd_name']}  <br> ".
         "Price : {$row['prd_price']} <br> ".         "--------------------------------<br>";
} 

if( $page > 0 && !($left_rec < $rec_limit) )
{
   $last = $page - 2;
   echo "<a href=\"$_PHP_SELF?page=$last\">Previous 5 Records</a> |";
   echo "<a href=\"$_PHP_SELF?page=$page\">Next 5 Records</a>";
}
else if( $page == 0 )
{
   echo "<a href=\"$_PHP_SELF?page=$page\">Previous 5 Records</a>";
}
else if( $left_rec < $rec_limit )
{
   $last = $page - 2;
   echo "<a href=\"$_PHP_SELF?page=$last\">Previous 5 Records</a>";
}
mysql_close($conn);
?>

See the effect here:

First page:

Middle page:

Last page:

That's me Avnish Alok, the guy behind this blog, a Software Engineer, Blogger, Freelancer and a true technology geek indeed. I believe in the ideology of BENJAMIN FRANKLIN great quote "He that can have patience can have what he will". I retain all such qualities to be a technology geek i:e; spend my much more time with computer, treating my pc as a family member, awake up at every morning with more passion to know about new tools & technologies, dig deeply to know more about each stuff.
Apart from my profession i love to write poems and reading novels as well. I write poems of genres like inspirational and romantic.

I hold my PG degree(MCA) in Information Technology and planning to do P.H.D in the same. As I’m a blogger, it is obvious to do blogging so, CS HOT TOPICS is the outcome. With the help of this blog I share my knowledge to my friends, my colleagues and to the entire world.

ABOUT CS HOT TOPICS:
CS HOT TOPICS is a technical blog for open source enthusiasts that always updates with latest tools & technologies. As the name suggest it covers hot topics of computer programming in various languages(java, jsp, servlet, php, mysql, oracle) to name a few with latest tools(ajax, jquery). You can get more to visit here http://cshotopics.blogspot.com/

You can follow me on Google+, Facebook and Twitter, If you’d like to dig more about me.

If you’ve any Queries about Add. and content Posting, or want to provide me your feedback so that i can improve this blog further, feel free to email me at avnishalok.se@gmail.com

ABOUT ME

Friday, December 12, 2014

How to Validate Image Extension in JavaScript ?

Thursday, November 27, 2014

simple pagination in php

About me