how we can make related combo box

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DEAR SIR I AM USING FOLLOWING CODE

 DATABASE /////////////////// company//////

Database: `Work`
Table structure for table `category`
CREATE TABLE `category` (
`id` bigint(11) NOT NULL auto_increment,
`category_name` varchar(255) NOT NULL,<big></big>
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=20 ;

Dumping data for table "category":

INSERT INTO `category` (`id`, `category_name`) VALUES
(9, 'Electronics'),
(2, 'Mobiles'),
(3, 'Camera'),
(10, 'Home & Kitchen'),
(11, 'Apparel'),
(12, 'Gifts'),
(13, 'Appliances'),
(19, 'Medicine');

Table structure for table "company":

CREATE TABLE `company`
(
`id` bigint(11) NOT NULL auto_increment,
`cat_id` int(11) NOT NULL,
`company_name` varchar(255) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=34 ;

Dumping data for table "company":

INSERT INTO `company` (`id`, `cat_id`, `company_name`) VALUES
(1, 2, 'Samsung'),
(2, 2, 'Nokia'),
(3, 2, 'LG'),
(6, 11, 'Rebook'),
(7, 11, 'Denim'),
(8, 11, 'Nike'),
(9, 13, 'Philips'),
(10, 13, 'Prestige'),
(11, 3, 'Nikon'),
(12, 3, 'Cannon'),
(13, 3, 'Sony'),
(14, 9, 'Tohsiba'),
(15, 9, 'Panasonic'),
(16, 12, 'Dinner Set'),
(31, 19, 'Generic'),
(18, 10, 'Samsung'),
(19, 10, 'LG'),
(30, 19, 'Branded'),
(32, 19, 'Ayurvedic '),
(29, 19, 'OTC'),
(33, 19, 'homeopethic');

Code Part

config.php
<?php
$host="localhost";
$username="root";
$password="root";
$dbname="company";
$con=mysql_connect("$host","$username","$password");
mysql_select_db("$dbname",$con);
?>




<?php
include('config.php');
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Untitled Document</title>
<script language="javascript" type="text/javascript">
function showCompany(catid) {
document.frm.submit();
}
</script>
</head>
<body>
<form action="" method="post" name="frm" id="frm">
<table width="500" border="0">
<tr>
<td width="119">Category</td>
<td width="371">
<select name="cat_id" id="cat_id" value="cat_id" onChange="showCompany(this.value);">
<option value="">--Select--</option>
<?php
$sql1="select * from category";
$sql_row1=mysql_query($sql1);
while($sql_res1=mysql_fetch_assoc($sql_row1))
{
?>
<option value="<?php echo $sql_res1["id"]; ?>" <?php if($sql_res1["id"]==$_REQUEST["cat_id"]) { echo "Selected";}?>>
<?php echo $sql_res1["category_name"]; ?></option>
<?php
}
?>
</select>
</td>
</tr>
<tr>
<td>Company</td>
<td id="td_company">
<select name="company_id" id="company_id">
<option value="">--Select--</option>
<?php
$sql="select * from company where cat_id='$_REQUEST[cat_id]'";
$sql_row=mysql_query($sql);
while($sql_res=mysql_fetch_assoc($sql_row))
{
?>
<option value="<?php echo $sql_res["id"]; ?>"><?php echo $sql_res["company_name"]; ?></option>
<?php
}
?>
</select>
</td>
</tr>
<tr>
<td>&nbsp;</td>
<td>&nbsp;</td>
</tr>
</table>
</form>
</body>
</html>


but when i am run this code its gives following error


( ! ) Notice: Undefined index: cat_id in C:\wamp\www\Related combobox\combo.php on line 32
Call Stack
#   Time    Memory  Function    Location
1   0.0008  143712  {main}( )   ..\combo.php:0

how we can resolve it................

Posted 15-Oct-14 2:28am

osmo33

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Comments

Sergey Alexandrovich Kryukov 15-Oct-14 12:15pm

You use undefined index. What is unclear in this error message?
—SA

Maciej Los 15-Oct-14 16:25pm

Do not repost!
How we can fill Dropdown list from data base and how we can fill another dropdownlist on change of first droupdown value.[^]

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