I have created a verification script to verify information and redirect
the customer to the appropriate error page. For example:
if ($FName=""){
header('Locatio n:/verify_fname.ht m');
}
else{
if ($LName=""){
header('Locatio n:/verify_lname.ht m');
}
else{
if ($Company=""){
header('Locatio n:/verify_company. htm');
}
else{
if ($Title=""){
header('Locatio n:/verify_title.ht m');
}
}
}
}
The intent of the code is to check a variable. If an error is found in
the variable, it redirects to the correct error page. Otherwise, it
continues on through the else statement which then checks another
variable and so and so on. The final else statement redirects to a
process script that takes all the information writes it to a table. I
am getting this error message:
Cannot modify header information - headers already sent by
I can't put the redirect before the HTML as I want the redirect to be
conditional. Any help would be appreciated.
12  1884 
Jerim79 wrote:
I have created a verification script to verify information and redirect
the customer to the appropriate error page. For example:
if ($FName=""){
header('Locatio n:/verify_fname.ht m');
}
else{
if ($LName=""){
header('Locatio n:/verify_lname.ht m');
}
else{
if ($Company=""){
header('Locatio n:/verify_company. htm');
}
else{
if ($Title=""){
header('Locatio n:/verify_title.ht m');
}
}
}
}
The intent of the code is to check a variable. If an error is found in
the variable, it redirects to the correct error page. Otherwise, it
continues on through the else statement which then checks another
variable and so and so on. The final else statement redirects to a
process script that takes all the information writes it to a table. I
am getting this error message:
Cannot modify header information - headers already sent by
I can't put the redirect before the HTML as I want the redirect to be
conditional. Any help would be appreciated.
Jerim,
Why don't you want the redirect before the HTML? If you redirect the
user, you don't want the HTML to show, do you?
It can still be conditional. Put it at the top, and if everything is
OK, just have it fall through to the HTML.
BTW - this is a very user-unfriendly way of doing it. You should rather
check all the options, then if any are incorrect, redirect with all of
the invalid information. This way if there are three things wrong, the
user must gets an error message for the first one and corrects it. Then
he gets an error message for the second one, and so on.
If you check them all, you can display all three error messages at the
same time. Much more user friendly.
--
=============== ===
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp. js*******@attgl obal.net
=============== ===
It can still be conditional. Put it at the top, and if everything is
OK, just have it fall through to the HTML.
BTW - this is a very user-unfriendly way of doing it. You should rather
check all the options, then if any are incorrect, redirect with all of
the invalid information. This way if there are three things wrong, the
user must gets an error message for the first one and corrects it. Then
he gets an error message for the second one, and so on.
If you check them all, you can display all three error messages at the
same time. Much more user friendly.
Something like this, I believe:
<?php
// Code to check validity of data.
if (everything valid) {
// code to process data
// redirect to new page
} else {
// Set error messages for individual data elements.
}
?>
<html>
<form>
<input 1>
<?php if ($errorMsg1 != "") print $errorMsg1 ?>
<input 2>
<?php if ($errorMsg2 != "") print $errorMsg2 ?>
...
</html> e_*******@hotma il.com wrote:
It can still be conditional. Put it at the top, and if everything is
OK, just have it fall through to the HTML.
BTW - this is a very user-unfriendly way of doing it. You should rather
check all the options, then if any are incorrect, redirect with all of
the invalid information. This way if there are three things wrong, the
user must gets an error message for the first one and corrects it. Then
he gets an error message for the second one, and so on.
If you check them all, you can display all three error messages at the
same time. Much more user friendly.
Something like this, I believe:
<?php
// Code to check validity of data.
if (everything valid) {
// code to process data
// redirect to new page
} else {
// Set error messages for individual data elements.
}
?>
<html>
<form>
<input 1>
<?php if ($errorMsg1 != "") print $errorMsg1 ?>
<input 2>
<?php if ($errorMsg2 != "") print $errorMsg2 ?>
...
</html>
I appreciate the help. I think the concept is getting clearer. I am
just curious though. The first time a person loads the webpage wouldn't
the php execute and since all of the variables are null, wouldn't it
automatically display an error message even before the person has had a
chance to fill out the form?
Jerim79 wrote:
e_*******@hotma il.com wrote:
>>>It can still be conditional. Put it at the top, and if everything is
OK, just have it fall through to the HTML.
BTW - this is a very user-unfriendly way of doing it. You should rather
check all the options, then if any are incorrect, redirect with all of
the invalid information. This way if there are three things wrong, the
user must gets an error message for the first one and corrects it. Then
he gets an error message for the second one, and so on.
If you check them all, you can display all three error messages at the
same time. Much more user friendly.
Something like this, I believe:
<?php
// Code to check validity of data.
if (everything valid) {
// code to process data
// redirect to new page
} else {
// Set error messages for individual data elements.
}
?>
<html>
<form>
<input 1>
<?php if ($errorMsg1 != "") print $errorMsg1 ?>
<input 2>
<?php if ($errorMsg2 != "") print $errorMsg2 ?>
...
</html>
I appreciate the help. I think the concept is getting clearer. I am
just curious though. The first time a person loads the webpage wouldn't
the php execute and since all of the variables are null, wouldn't it
automatically display an error message even before the person has had a
chance to fill out the form?
If you're validating on the same page, yes. You have to test for that.
For instance, if you have your submit button as:
<input type="submit" name="submit" value="Submit">
you could check:
if (isset[$_POST['submit'] && $_POST['submit'] == 'Submit') {
... do your validation here
Just be sure no other page posts to this one with the same submit button.
--
=============== ===
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp. js*******@attgl obal.net
=============== ===
I appreciate the help. I think the concept is getting clearer. I am
just curious though. The first time a person loads the webpage wouldn't
the php execute and since all of the variables are null, wouldn't it
automatically display an error message even before the person has had a
chance to fill out the form?
The structure of my pages looks like this:
<?php // Very first thing, so header redirects work
// Initialize variables that appear in html, so they are empty, not
null
if ($_POST) {
// validate & process data
}
?>
<html>
web content
</html>
The if ($_POST) prevents any validation from being done until the user
has submitted some data. It is common for many people not to bother
initializing the variables, but if you look at your html output, it's
pretty ugly with a bunch of "uninitiali zed variable" messages in the
code. This all works for me locally, but I haven't gone live with it
yet. Am I missing anything?
Jerry Stuckle wrote:
Jerim79 wrote:
e_*******@hotma il.com wrote:
>>It can still be conditional. Put it at the top, and if everything is
OK, just have it fall through to the HTML.
BTW - this is a very user-unfriendly way of doing it. You should rather
check all the options, then if any are incorrect, redirect with all of
the invalid information. This way if there are three things wrong, the
user must gets an error message for the first one and corrects it. Then
he gets an error message for the second one, and so on.
If you check them all, you can display all three error messages at the
same time. Much more user friendly.
Something like this, I believe:
<?php
// Code to check validity of data.
if (everything valid) {
// code to process data
// redirect to new page
} else {
// Set error messages for individual data elements.
}
?>
<html>
<form>
<input 1>
<?php if ($errorMsg1 != "") print $errorMsg1 ?>
<input 2>
<?php if ($errorMsg2 != "") print $errorMsg2 ?>
...
</html>
I appreciate the help. I think the concept is getting clearer. I am
just curious though. The first time a person loads the webpage wouldn't
the php execute and since all of the variables are null, wouldn't it
automatically display an error message even before the person has had a
chance to fill out the form?
If you're validating on the same page, yes. You have to test for that.
For instance, if you have your submit button as:
<input type="submit" name="submit" value="Submit">
you could check:
if (isset[$_POST['submit'] && $_POST['submit'] == 'Submit') {
... do your validation here
Just be sure no other page posts to this one with the same submit button.
--
=============== ===
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
js*******@attgl obal.net
=============== ===
Here is the basic gist of what I have:
<?php
$FName=$_Post['FName'];
if ($FName !=""){
header("Locatio n: write_to_databa se.php");
}
else{
if ($FName=""){
$errormsg1="Ple ase enter a first name":
}
?>
<html>
<body>
Registration
<?php if ($errormsg1 !="") echo $errormsg1); ?>
<br />
<form action="(this page)" method="Post">
First Name: <input type="text" name="FName">
<br />
<input type="submit" name="submit value="Submit">
</form>
</body>
</html>
Forgetting the problem about loading the errors up before filling out
the form, I can't get this to work at all. After I click on submit it
just brings me back to the same page, with no error messages.
Here is the basic gist of what I have:
<?php
$FName=$_Post['FName'];
if ($FName !=""){
header("Locatio n: write_to_databa se.php");
}
else{
if ($FName=""){
$errormsg1="Ple ase enter a first name":
}
?>
<html>
<body>
Registration
<?php if ($errormsg1 !="") echo $errormsg1); ?>
<br />
<form action="(this page)" method="Post">
First Name: <input type="text" name="FName">
<br />
<input type="submit" name="submit value="Submit">
</form>
</body>
</html>
Forgetting the problem about loading the errors up before filling out
the form, I can't get this to work at all. After I click on submit it
just brings me back to the same page, with no error messages.
Try:
<?php
$FName = "";
$errorMsg1 = "";
if ($_POST) {
if ( isset($_POST['FName']) ) {
$FName = $_POST['FName'];
}
Now you can validate $FName, because it's either empty or set to
user's value. Don't write to database without validating all data.
The rest looks good. Good luck.
e_matt...@hotma il.com wrote:
Here is the basic gist of what I have:
<?php
$FName=$_Post['FName'];
if ($FName !=""){
header("Locatio n: write_to_databa se.php");
}
else{
if ($FName=""){
$errormsg1="Ple ase enter a first name":
}
?>
<html>
<body>
Registration
<?php if ($errormsg1 !="") echo $errormsg1); ?>
<br />
<form action="(this page)"
method="Post">
First Name: <input type="text" name="FName">
<br />
<input type="submit" name="submit value="Submit">
</form>
</body>
</html>
Forgetting the problem about loading the errors up before filling out
the form, I can't get this to work at all. After I click on submit it
just brings me back to the same page, with no error messages.
Try:
<?php
$FName = "";
$errorMsg1 = "";
if ($_POST) {
if ( isset($_POST['FName']) ) {
$FName = $_POST['FName'];
}
Now you can validate $FName, because it's either empty or set to
user's value. Don't write to database without validating all data.
The rest looks good. Good luck.
Since I am still learning, I just wanted state the logic of the code.
First we set $FName equal to nothing. Then we set $errorMsg1 equal to
nothing. Next we say "if the method is $_POST" then check to see if
$_POST['FName'] has been set. If it has, then set $FName equal to
$_POST['FName']
I still can't get it to display the error message.
Jerim79 wrote:
e_matt...@hotma il.com wrote:
Here is the basic gist of what I have:
>
<?php
$FName=$_Post['FName'];
>
if ($FName !=""){
header("Locatio n: write_to_databa se.php");
}
else{
if ($FName=""){
$errormsg1="Ple ase enter a first name":
}
?>
>
<html>
<body>
Registration
<?php if ($errormsg1 !="") echo $errormsg1); ?>
<br />
<form action="(this page)"
method="Post">
First Name: <input type="text" name="FName">
<br />
<input type="submit" name="submit value="Submit">
</form>
</body>
</html>
>
Forgetting the problem about loading the errors up before filling out
the form, I can't get this to work at all. After I click on submit it
just brings me back to the same page, with no error messages.
Try:
<?php
$FName = "";
$errorMsg1 = "";
if ($_POST) {
if ( isset($_POST['FName']) ) {
$FName = $_POST['FName'];
}
Now you can validate $FName, because it's either empty or set to
user's value. Don't write to database without validating all data.
The rest looks good. Good luck.
Since I am still learning, I just wanted state the logic of the code.
First we set $FName equal to nothing. Then we set $errorMsg1 equal to
nothing. Next we say "if the method is $_POST" then check to see if
$_POST['FName'] has been set. If it has, then set $FName equal to
$_POST['FName']
I still can't get it to display the error message.
Here is the current, non-working code:
<?php
$FName="";
$errormsg1="";
if( isset($_POST['FName']){
$FName=$_POST['FName'];
}
if ($FName !=""){
header("Locatio n: write_to_databa se.php");
}
else{
if ($FName=""){
$errormsg1="Ple ase enter a first name":
}
?>
<html>
<body>
Registration
<?php if ($errormsg1 !=""){ echo $errormsg1; } ?>
<form action="new.htm " method="POST">
First Name: <input type="text" name="FName">
<br />
<input type="submit" name="submit" value="Submit">
</form>
</body>
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