-
<?php
-
require_once('database_conn.php');
-
session_start();
-
if(isset($_SESSION['username']))
-
{
-
if(isset($_GET['action']) && $_GET['action']=="submit")
-
{
-
$cust_id=$_POST['cname'];
-
echo $cust_id;
-
}
-
else
-
{
-
?>
-
<html>
-
<head>
-
<script type="text/javascript">
-
function cust_display()
-
{
-
if(document.getElementById('cname').value==0)
-
{
-
alert("Please Select Customer Name");
-
}
-
else
-
{
-
document.getElementById('cust_id').value=document.getElementById('cname').value;
-
alert(document.getElementById('cust_id').value);
-
window.location="bill_index.php?action=submit";
-
}
-
}
-
</script>
-
</head>
-
<body>
-
<?php
-
include('adminlogin.php');
-
?>
-
<form action="#" method="post" name="cust">
-
<br />
-
<center>
-
Select Customer Name :
-
<select name="cname" id="cname" class="bg2" onChange="cust_display()">
-
<option value="0">--Select--</option>
-
<?php
-
$query=mysql_query("select cust_name,cust_id from pms_customer");
-
while($r=mysql_fetch_object($query))
-
{
-
?>
-
<option value="<?php echo $r->cust_id;?>"><?php echo $r->cust_name;?></option>
-
<?php
-
}
-
-
?>
-
</select>
-
-
</form>
-
<input type="hidden" name="cust_id" id="cust_id" />
-
<?php
-
}
-
?>
-
</html>
-
<?php
-
}
-
else
-
{
-
header("location:login_index.php");
-
}
-
?>
-
when i execute this program....undefined index ...error appers....how to solve thi s problem....
14  3878 
I cannot see where you submit the form, is submitted at all.
Secondly, you mix $_GET and $_POST, so what is it?[php]if(isset($_GET['action']) && $_GET['action']=="submit")
{
$cust_id=$_POST['cname'];
echo $cust_id;
}[/php]Ronald
Atli 5,058
Expert 4TB
Hi.
That particular mix of GET and POST data looks kind of strange to me to.
I don't see a submit button for the form. The only thing I see there is a JavaScript redirect, which includes the "?action=submit" GET string.
If that is indeed what you are using to submit your form, you must realize that none of the form's <input> elements are being sent. The form is not actually being submitted, the browser is simply being redirected.
Which would cause the POST array to be empty, leading to the undefined index notice.
To solve this... set the <form> action to "?action=submit" and add a <input type=submit> element to submit the form.
Or have JavaScript submit the form via the: "form.submit()" function.
.... :o
I think I posted in this thread.... but I can't see my post...
.... :o
I think I posted in this thread.... but I can't see my post...
Sorry about that hsriat!
You posted in the duplicate thread. This mixup of threads is one of the reasons why duplicate threads are not allowed.
Your post can still be seen in that thread HERE
Ronald
Sorry about that hsriat!
You posted in the duplicate thread. This mixup of threads is one of the reasons why duplicate threads are not allowed.
Your post can still be seen in that thread HERE
Ronald
oh its cool!!. No need to apologize... :)
I was actually confused about whether I pressed Submit Reply or not. :D
Regards,
Harpreet
I suggest that you just post your reply again. I could do that. but that would be an infringement of your copyright :-)
Ronald
I suggest that you just post your reply again. I could do that. but that would be an infringement of your copyright :-)
Ronald
Well, after reading the code again, I think the main problem is not what I thought earlier. But its at line 27, in the JavaScript code. @selvialagar
Remove line 27 and write the following lines instead. -
document.forms[0].action = "bill_index.php?action=submit";
-
document.forms[0].submit();
If problem still persists, replace && in line 6 with & (single ampersand).
Harpreet
Atli 5,058
Expert 4TB
...
If problem still persists, replace && in line 6 with & (single ampersand).
Harpreet
Or you could just write "and".
PHP understands all of them...
(& == && == and) if that makes any sense ;)
Or you could just write "and".
PHP understands all of them...
(& == && == and) if that makes any sense ;)
Sorry about that, but it has to be either && or and, but NOT &.
I got confused between & and &&. & would actually give error here. & usually gives same results as && does but not always.
In case of &&, if first condition is false, it will return false, without caring to check the second one.
But & will always check both conditions before returning anything.
I tested it with this example:[php]<?php
echo "With <b>&&:</b><br>";
if (A(false) && B(true))
{
echo "0";
}
echo "<br>------------<br>With <b>&:</b><br>";
if (A(false) & B(true))
{
echo "0";
}
function A($c)
{
echo "Function A executed<br>";
return $c;
}
function B($c)
{
echo "Function B executed<br>";
return $c;
}
?>
[/php]
Regards,
Harpreet
Atli 5,058
Expert 4TB
Sorry about that, but it has to be either && or and, but NOT &.
I got confused between & and &&.
& would actually give error here. & usually gives same results as && does but not always.
In case of &&, if first condition is false, it will return false, without caring to check the second one.
But & will always check both conditions before returning anything.
I tested it with this example:
...
Regards,
Harpreet
Ahh, I see.
Nice catch, I never thought to check that.
I think this would actually qualify as a bug, as checking the extra parameters does nothing but degrade performance and cause possible errors. I can't think of any real reason why you would want the extra parameters checked if the others fail.
And like you say, in this case, using the single & would cause the undefined index notice if the first check fails.
 Atli 5,058
Expert 4TB
To contradict my previous post :P...
After digging a little deeper, I find that the single & is in fact NOT a logical operator, which "and" and "&&" are...
It is in fact a bitwise operator, which explains why it evaluates everything before returning.
It is meant to compare all the parameters and "set" all bits that are identical (which in the case of boolean values, will always be 0 (false) unless all parameters are true).
Also...
There are slight differences between "&&" and "and".
They will work identically when used inside an if statement, but when used on variables, they differ slightly.
Consider this: -
$a = true && false; // evaluates into: false
-
$b = true and false; // evaluates into: true
-
The difference...
"&&" has higher precedence than "=", so "true && false" is evaluated and then stored in $a
"and" has lower precedence than "=", so "$b = false" is evaluated first, which is then evaluated against "and false", which changes nothing and $b remains true.
Lastly... we seem to have wandered slightly of topic.
My apologies for that :)
To contradict my previous post :P...
After digging a little deeper, I find that the single & is in fact NOT a logical operator, which "and" and "&&" are...
It is in fact a bitwise operator, which explains why it evaluates everything before returning.
It is meant to compare all the parameters and "set" all bits that are identical (which in the case of boolean values, will always be 0 (false) unless all parameters are true).
Also...
There are slight differences between "&&" and "and".
They will work identically when used inside an if statement, but when used on variables, they differ slightly.
Consider this:
-
$a = true && false; // evaluates into: false
-
$b = true and false; // evaluates into: true
-
The difference...
"&&" has higher precedence than "=", so "true && false" is evaluated and then stored in $a
"and" has lower precedence than "=", so "$b = false" is evaluated first, which is then evaluated against "and false", which changes nothing and $b remains true.
Lastly... we seem to have wandered slightly of topic.
My apologies for that :)
Wow!
Seems like i'm thanking you alot, recently!
Haha.
Cheers(again).
thank u very much for your guidence..........
Here is where a bit of discipline in script writing can go a long way. Writing clear and understandable code helps not only yourself in debugging it but also others in helping you.
I have two hopefully helpful comments in this regard:
You have a line something like "$query = mysql_query(" etc. ")" and it really threw me off when I looked at your code, that you used the variable name $query here. The query is actually the argument of this function, not its return value. I use the variable $result instead. This maybe seems like nitpicking, but using an appropriate variable name helps make the code clearer.
Another point is that you should try to separate a bit more clearly the code that produces HTML output to the requester's browser, and the code that does other tasks, such as database queries.
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