Dynamic Radio Buttons

**Moot** · Apr 6 '07, 02:15 PM

Re: Dynamic Radio Buttons

On Apr 6, 9:36 am, "Jerim79" <m...@hotmail.c omwrote:

>
echo "while ($Number!=0){
<input type=\"radio\" name=\"Age$Numb er[]\" value=\"20-30"\>20-30
<input type=\"radio\" name=\"Age$Numb er[]\" value=\"30-40\">30-40
<input type=\"radio\" name=\"Age$Numb er[]\" value=\"40-50\">40-50
$Number--
} ";
>

You just answered your own question. Well, almost. Syntax is a
little off, but you were on the right track.

while ($Number!=0){
echo "<input type=\"radio\" name=\"Age{$Num ber}[]\" value=
\"20-30\">20-30
<input type=\"radio\" name=\"Age{$Num ber}[]\" value=\"30-40\">30-40
<input type=\"radio\" name=\"Age{$Num ber}[]\" value=\"40-50\">40-50";
$Number--;
}

**Erwin Moller** · Apr 6 '07, 02:15 PM

Re: Dynamic Radio Buttons

Jerim79 wrote:

My situation is that I have a form that asks the user for a number.
Next, I execute a while loop that displays a group of questions the
amount of times the customer entered. For instance, the loop looks
this:
>
while ($Number!=0){
<input type="radio" name="Age[]" value="20-30">20-30
<input type="radio name="Age[]" value="30-40">30-40
<input type="radio name"Age[]" value="40-50">40-50
$Number--;
}
>
Let's say someone entered 3 for $Number. When the loop executes it
will produce:
>
echo" <input type=\"radio\" name=\"Age[]\" value=\"20-30\">20-30
<input type=\"radio\" name=\"Age[]\" value=\"30-40\">30-40
<input type=\"radio\" name=\"Age[]\" value=\"40-50\">40-50";
>
echo" <input type=\"radio\" name=\"Age[]\" value=\"20-30\">20-30
<input type=\"radio\" name=\"Age[]\" value=\"30-40\">30-40
<input type=\"radio\" name=\"Age[]\" value=\"40-50\">40-50";
>
echo" <input type=\"radio\" name=\"Age[]\" value=\"20-30\">20-30
<input type=\"radio\" name=\"Age[]\" value=\"30-40\">30-40
<input type=\"radio\" name=\"Age[]\" value=\"40-50\">40-50";
>
The problem is that with radio buttons, you can only choose one
option. With this code, it only allows the user to choose one option
from among the 9 listed, instead of one from each set. I am trying to
find a way to dynamically name each set. If I use checkboxes, then it
records the information correctly and correctly writes it to the
database. However, checkboxes don't look good for this application in
my opinion, and there is no way for me to keep someone from checking
more than one box, that I know of. Here is the PHP code I am using to
catch the user's input and write it to a database:
>
$Age = $_POST['Age'];
>
for ($i=0; $i < $Number; $i++) {
$query="INSERT INTO table VALUES('$Age[$i])";
$result = mysql_query($qu ery) or die('Query failed: ' .
mysql_error());
}
>
Like I say, that works fine if I use checkboxes, without changing the
HTML name="Age[]". I am looking for a way to define "sets" of radio
buttons with the same name, so that only one from within a set can be
chosen at a time. Is there something such as:
>
echo "<group name="1">
<input type=\"radio\" name=\"Age[]\" value=\"20-30\">20-30
<input type=\"radio\" name=\"Age[]\" value=\"30-40\">30-40
<input type=\"radio\" name=\"Age[]\" value=\"40-50\">40-50
</group>";
>
echo "<group name=\"2\">
<input type=\"radio\" name=\"Age[]\" value=\"20-30\">20-30
<input type=\"radio\" name=\"Age[]\" value=\"30-40\">30-40
<input type=\"radio\" name=\"Age[]\" value=\"40-50\">40-50
</group>";
>
echo "<group name=\"3\">
<input type=\"radio\" name=\"Age[]\" value=\"20-30\">20-30
<input type=\"radio\" name=\"Age[]\" value=\"30-40\">30-40
<input type=\"radio\" name=\"Age[]\" value=\"40-50\">40-50
</group>";
>
This may be more of a HTML question, but I am open to any solution
that would help. Any way to use PHP to accomplish my goal? Even if
there is a way to dynamically name each set such as:
>
echo "while ($Number!=0){
<input type=\"radio\" name=\"Age$Numb er[]\" value=\"20-30"\>20-30
<input type=\"radio\" name=\"Age$Numb er[]\" value=\"30-40\">30-40
<input type=\"radio\" name=\"Age$Numb er[]\" value=\"40-50\">40-50
$Number--
} ";
>
I would just have to create a loop to run through each array when
writing to the database, but that shouldn't be a problem.

Hi,

You cannot make a group of the radiobuttons since you named them all Age[]
and that IS the group as far as HTML is concerned.
So just code it in such a way they have different names, like this:

<?php
// receive number
$number = (int)$_POST["number"];
?>
<input type="hidden" name="numberOfA ges" value="<?php echo $number; ?>">
<?php
for ($count=0;$coun t<$number;$coun t++){
?>
<input type="radio" name="Age<?php echo $number; ?>[]"
value="20-30">20-30
<input type="radio name="Age[]<?php echo $number; ?>"
value="30-40">30-40
<input type="radio name"Age[]<?php echo $number; ?>"
value="40-50">40-50
<?php
}
?>

Now them radiogroups have names like Age0[] and Age1[]

And in the receiving script:
$numberOfAges = $_POST["numberOfAg es"];
for ($count=0;$coun t<$numberOfAges ;$count++){
$name = "Age".$coun t;
$theSelectedVal ue = $_POST[$name];
// Do whatever you want with $theSelectedVal ue
}

Not tested, but I hope you get my drift. :-)

Regards,
Erwin Moller

**Jerim79** · Apr 6 '07, 05:05 PM

Re: Dynamic Radio Buttons

On Apr 6, 9:08 am, Erwin Moller
<since_humans_r ead_this_I_am_s pammed_too_m... @spamyourself.c omwrote:

Jerim79 wrote:

My situation is that I have a form that asks the user for a number.
Next, I execute a while loop that displays a group of questions the
amount of times the customer entered. For instance, the loop looks
this:

>

while ($Number!=0){
<input type="radio" name="Age[]" value="20-30">20-30
<input type="radio name="Age[]" value="30-40">30-40
<input type="radio name"Age[]" value="40-50">40-50
$Number--;
}

>

Let's say someone entered 3 for $Number. When the loop executes it
will produce:

>

echo" <input type=\"radio\" name=\"Age[]\" value=\"20-30\">20-30
<input type=\"radio\" name=\"Age[]\" value=\"30-40\">30-40
<input type=\"radio\" name=\"Age[]\" value=\"40-50\">40-50";

>

echo" <input type=\"radio\" name=\"Age[]\" value=\"20-30\">20-30
<input type=\"radio\" name=\"Age[]\" value=\"30-40\">30-40
<input type=\"radio\" name=\"Age[]\" value=\"40-50\">40-50";

>

echo" <input type=\"radio\" name=\"Age[]\" value=\"20-30\">20-30
<input type=\"radio\" name=\"Age[]\" value=\"30-40\">30-40
<input type=\"radio\" name=\"Age[]\" value=\"40-50\">40-50";

>

The problem is that with radio buttons, you can only choose one
option. With this code, it only allows the user to choose one option
from among the 9 listed, instead of one from each set. I am trying to
find a way to dynamically name each set. If I use checkboxes, then it
records the information correctly and correctly writes it to the
database. However, checkboxes don't look good for this application in
my opinion, and there is no way for me to keep someone from checking
more than one box, that I know of. Here is the PHP code I am using to
catch the user's input and write it to a database:

>

$Age = $_POST['Age'];

>

for ($i=0; $i < $Number; $i++) {
$query="INSERT INTO table VALUES('$Age[$i])";
$result = mysql_query($qu ery) or die('Query failed: ' .
mysql_error());
}

>

Like I say, that works fine if I use checkboxes, without changing the
HTML name="Age[]". I am looking for a way to define "sets" of radio
buttons with the same name, so that only one from within a set can be
chosen at a time. Is there something such as:

>

echo "<group name="1">
<input type=\"radio\" name=\"Age[]\" value=\"20-30\">20-30
<input type=\"radio\" name=\"Age[]\" value=\"30-40\">30-40
<input type=\"radio\" name=\"Age[]\" value=\"40-50\">40-50
</group>";

>

echo "<group name=\"2\">
<input type=\"radio\" name=\"Age[]\" value=\"20-30\">20-30
<input type=\"radio\" name=\"Age[]\" value=\"30-40\">30-40
<input type=\"radio\" name=\"Age[]\" value=\"40-50\">40-50
</group>";

>

echo "<group name=\"3\">
<input type=\"radio\" name=\"Age[]\" value=\"20-30\">20-30
<input type=\"radio\" name=\"Age[]\" value=\"30-40\">30-40
<input type=\"radio\" name=\"Age[]\" value=\"40-50\">40-50
</group>";

>

This may be more of a HTML question, but I am open to any solution
that would help. Any way to use PHP to accomplish my goal? Even if
there is a way to dynamically name each set such as:

>

echo "while ($Number!=0){
<input type=\"radio\" name=\"Age$Numb er[]\" value=\"20-30"\>20-30
<input type=\"radio\" name=\"Age$Numb er[]\" value=\"30-40\">30-40
<input type=\"radio\" name=\"Age$Numb er[]\" value=\"40-50\">40-50
$Number--
} ";

>

I would just have to create a loop to run through each array when
writing to the database, but that shouldn't be a problem.

>
Hi,
>
You cannot make a group of the radiobuttons since you named them all Age[]
and that IS the group as far as HTML is concerned.
So just code it in such a way they have different names, like this:
>
<?php
// receive number
$number = (int)$_POST["number"];
?>
<input type="hidden" name="numberOfA ges" value="<?php echo $number; ?>">
<?php
for ($count=0;$coun t<$number;$coun t++){
?>
<input type="radio" name="Age<?php echo $number; ?>[]"
value="20-30">20-30
<input type="radio name="Age[]<?php echo $number; ?>"
value="30-40">30-40
<input type="radio name"Age[]<?php echo $number; ?>"
value="40-50">40-50
<?php
}
?>
>
Now them radiogroups have names like Age0[] and Age1[]
>
And in the receiving script:
$numberOfAges = $_POST["numberOfAg es"];
for ($count=0;$coun t<$numberOfAges ;$count++){
$name = "Age".$coun t;
$theSelectedVal ue = $_POST[$name];
// Do whatever you want with $theSelectedVal ue
>
}
>
Not tested, but I hope you get my drift. :-)
>
Regards,
Erwin Moller

Thanks, that did the trick. I was just putting my variable before []
instead of after. Odd thing is that when I read it into the database,
I just use $Age[$i], where I thought I would have to use $Age[$i]
$Number. Not sure what is going on under the hood to make $Age[]
$Number into just $Age.

**Erwin Moller** · Apr 7 '07, 09:35 AM

Re: Dynamic Radio Buttons

Jerim79 wrote:

On Apr 6, 9:08 am, Erwin Moller
<since_humans_r ead_this_I_am_s pammed_too_m... @spamyourself.c omwrote:

>Jerim79 wrote:

My situation is that I have a form that asks the user for a number.
Next, I execute a while loop that displays a group of questions the
amount of times the customer entered. For instance, the loop looks
this:

>>

while ($Number!=0){
<input type="radio" name="Age[]" value="20-30">20-30
<input type="radio name="Age[]" value="30-40">30-40
<input type="radio name"Age[]" value="40-50">40-50
$Number--;
}

>>

Let's say someone entered 3 for $Number. When the loop executes it
will produce:

>>

echo" <input type=\"radio\" name=\"Age[]\" value=\"20-30\">20-30
<input type=\"radio\" name=\"Age[]\" value=\"30-40\">30-40
<input type=\"radio\" name=\"Age[]\" value=\"40-50\">40-50";

>>

echo" <input type=\"radio\" name=\"Age[]\" value=\"20-30\">20-30
<input type=\"radio\" name=\"Age[]\" value=\"30-40\">30-40
<input type=\"radio\" name=\"Age[]\" value=\"40-50\">40-50";

>>

echo" <input type=\"radio\" name=\"Age[]\" value=\"20-30\">20-30
<input type=\"radio\" name=\"Age[]\" value=\"30-40\">30-40
<input type=\"radio\" name=\"Age[]\" value=\"40-50\">40-50";

>>

The problem is that with radio buttons, you can only choose one
option. With this code, it only allows the user to choose one option
from among the 9 listed, instead of one from each set. I am trying to
find a way to dynamically name each set. If I use checkboxes, then it
records the information correctly and correctly writes it to the
database. However, checkboxes don't look good for this application in
my opinion, and there is no way for me to keep someone from checking
more than one box, that I know of. Here is the PHP code I am using to
catch the user's input and write it to a database:

>>

$Age = $_POST['Age'];

>>

for ($i=0; $i < $Number; $i++) {
$query="INSERT INTO table VALUES('$Age[$i])";
$result = mysql_query($qu ery) or die('Query failed: ' .
mysql_error());
}

>>

Like I say, that works fine if I use checkboxes, without changing the
HTML name="Age[]". I am looking for a way to define "sets" of radio
buttons with the same name, so that only one from within a set can be
chosen at a time. Is there something such as:

>>

echo "<group name="1">
<input type=\"radio\" name=\"Age[]\" value=\"20-30\">20-30
<input type=\"radio\" name=\"Age[]\" value=\"30-40\">30-40
<input type=\"radio\" name=\"Age[]\" value=\"40-50\">40-50
</group>";

>>

echo "<group name=\"2\">
<input type=\"radio\" name=\"Age[]\" value=\"20-30\">20-30
<input type=\"radio\" name=\"Age[]\" value=\"30-40\">30-40
<input type=\"radio\" name=\"Age[]\" value=\"40-50\">40-50
</group>";

>>

echo "<group name=\"3\">
<input type=\"radio\" name=\"Age[]\" value=\"20-30\">20-30
<input type=\"radio\" name=\"Age[]\" value=\"30-40\">30-40
<input type=\"radio\" name=\"Age[]\" value=\"40-50\">40-50
</group>";

>>

This may be more of a HTML question, but I am open to any solution
that would help. Any way to use PHP to accomplish my goal? Even if
there is a way to dynamically name each set such as:

>>

echo "while ($Number!=0){
<input type=\"radio\" name=\"Age$Numb er[]\" value=\"20-30"\>20-30
<input type=\"radio\" name=\"Age$Numb er[]\" value=\"30-40\">30-40
<input type=\"radio\" name=\"Age$Numb er[]\" value=\"40-50\">40-50
$Number--
} ";

>>

I would just have to create a loop to run through each array when
writing to the database, but that shouldn't be a problem.

>>
>Hi,
>>
>You cannot make a group of the radiobuttons since you named them all
>Age[] and that IS the group as far as HTML is concerned.
>So just code it in such a way they have different names, like this:
>>
><?php
>// receive number
>$number = (int)$_POST["number"];
>?>
><input type="hidden" name="numberOfA ges" value="<?php echo $number; ?>">
><?php
>for ($count=0;$coun t<$number;$coun t++){
>?>
> <input type="radio" name="Age<?php echo $number; ?>[]"
>value="20-30">20-30
> <input type="radio name="Age[]<?php echo $number; ?>"
>value="30-40">30-40
> <input type="radio name"Age[]<?php echo $number; ?>"
>value="40-50">40-50
><?php
> }
>?>
>>
>Now them radiogroups have names like Age0[] and Age1[]
>>
>And in the receiving script:
>$numberOfAge s = $_POST["numberOfAg es"];
>for ($count=0;$coun t<$numberOfAges ;$count++){
> $name = "Age".$coun t;
> $theSelectedVal ue = $_POST[$name];
> // Do whatever you want with $theSelectedVal ue
>>
>}
>>
>Not tested, but I hope you get my drift. :-)
>>
>Regards,
>Erwin Moller

>
Thanks, that did the trick. I was just putting my variable before []
instead of after. Odd thing is that when I read it into the database,
I just use $Age[$i], where I thought I would have to use $Age[$i]
$Number. Not sure what is going on under the hood to make $Age[]
$Number into just $Age.

Hi Jerim,

It is just the PHP way of passing arrays around from a form to a receiving
script.
If PHP receives for example the following 3 name/value pairs (via POST or
GET), they are automagically turned into an array:

1) name: Age[] value: 10
2) name: Age[] value: 20
3) name: Age[] value: 30

If you extract the Age from the posting, like this:
$passedAge = $_POST["Age"];
PHP 'sees' that Age[] is posted and extracts all the passed values into an
array ($passedAge in this case).
So if a name ends with the [] PHP knows you mean an array.

It is just the PHP way. :-)

Consider this wrong example:
1) name: Age value: 10
2) name: Age value: 20
3) name: Age value: 30

If you try to extract it now like this:
$passedAge = $_POST["Age"];

You'll end up with only the last value (30) and not an array.

So what went wrong in your first try was simply that you didn't end with the
[].

Hope that clearifies it a bit.

Good luck & happy coding!

Regards,
Erwin Moller

**bill** · Apr 7 '07, 10:35 AM

Re: Dynamic Radio Buttons

Erwin Moller wrote:

Jerim79 wrote:
>

>On Apr 6, 9:08 am, Erwin Moller
><since_humans_ read_this_I_am_ spammed_too_m.. .@spamyourself. comwrote:

>>Jerim79 wrote:
>>>My situation is that I have a form that asks the user for a number.
>>>Next, I execute a while loop that displays a group of questions the
>>>amount of times the customer entered. For instance, the loop looks
>>>this:
>>>while ($Number!=0){
>>> <input type="radio" name="Age[]" value="20-30">20-30
>>> <input type="radio name="Age[]" value="30-40">30-40
>>> <input type="radio name"Age[]" value="40-50">40-50
>>> $Number--;
>>> }
>>>Let's say someone entered 3 for $Number. When the loop executes it
>>>will produce:
>>> echo" <input type=\"radio\" name=\"Age[]\" value=\"20-30\">20-30
>>> <input type=\"radio\" name=\"Age[]\" value=\"30-40\">30-40
>>> <input type=\"radio\" name=\"Age[]\" value=\"40-50\">40-50";
>>> echo" <input type=\"radio\" name=\"Age[]\" value=\"20-30\">20-30
>>> <input type=\"radio\" name=\"Age[]\" value=\"30-40\">30-40
>>> <input type=\"radio\" name=\"Age[]\" value=\"40-50\">40-50";
>>> echo" <input type=\"radio\" name=\"Age[]\" value=\"20-30\">20-30
>>> <input type=\"radio\" name=\"Age[]\" value=\"30-40\">30-40
>>> <input type=\"radio\" name=\"Age[]\" value=\"40-50\">40-50";
>>>The problem is that with radio buttons, you can only choose one
>>>option. With this code, it only allows the user to choose one option
>>>from among the 9 listed, instead of one from each set. I am trying to
>>>find a way to dynamically name each set. If I use checkboxes, then it
>>>records the information correctly and correctly writes it to the
>>>database. However, checkboxes don't look good for this application in
>>>my opinion, and there is no way for me to keep someone from checking
>>>more than one box, that I know of. Here is the PHP code I am using to
>>>catch the user's input and write it to a database:
>>>$Age = $_POST['Age'];
>>>for ($i=0; $i < $Number; $i++) {
>>> $query="INSERT INTO table VALUES('$Age[$i])";
>>>$result = mysql_query($qu ery) or die('Query failed: ' .
>>>mysql_error( ));
>>>}
>>>Like I say, that works fine if I use checkboxes, without changing the
>>>HTML name="Age[]". I am looking for a way to define "sets" of radio
>>>buttons with the same name, so that only one from within a set can be
>>>chosen at a time. Is there something such as:
>>>echo "<group name="1">
>>> <input type=\"radio\" name=\"Age[]\" value=\"20-30\">20-30
>>> <input type=\"radio\" name=\"Age[]\" value=\"30-40\">30-40
>>> <input type=\"radio\" name=\"Age[]\" value=\"40-50\">40-50
>>></group>";
>>>echo "<group name=\"2\">
>>> <input type=\"radio\" name=\"Age[]\" value=\"20-30\">20-30
>>> <input type=\"radio\" name=\"Age[]\" value=\"30-40\">30-40
>>> <input type=\"radio\" name=\"Age[]\" value=\"40-50\">40-50
>>></group>";
>>>echo "<group name=\"3\">
>>> <input type=\"radio\" name=\"Age[]\" value=\"20-30\">20-30
>>> <input type=\"radio\" name=\"Age[]\" value=\"30-40\">30-40
>>> <input type=\"radio\" name=\"Age[]\" value=\"40-50\">40-50
>>></group>";
>>>This may be more of a HTML question, but I am open to any solution
>>>that would help. Any way to use PHP to accomplish my goal? Even if
>>>there is a way to dynamically name each set such as:
>>>echo "while ($Number!=0){
>>> <input type=\"radio\" name=\"Age$Numb er[]\" value=\"20-30"\>20-30
>>> <input type=\"radio\" name=\"Age$Numb er[]\" value=\"30-40\">30-40
>>> <input type=\"radio\" name=\"Age$Numb er[]\" value=\"40-50\">40-50
>>> $Number--
>>> } ";
>>>I would just have to create a loop to run through each array when
>>>writing to the database, but that shouldn't be a problem.
>>Hi,
>>>
>>You cannot make a group of the radiobuttons since you named them all
>>Age[] and that IS the group as far as HTML is concerned.
>>So just code it in such a way they have different names, like this:
>>>
>><?php
>>// receive number
>>$number = (int)$_POST["number"];
>>?>
>><input type="hidden" name="numberOfA ges" value="<?php echo $number; ?>">
>><?php
>>for ($count=0;$coun t<$number;$coun t++){
>>?>
>> <input type="radio" name="Age<?php echo $number; ?>[]"
>>value="20-30">20-30
>> <input type="radio name="Age[]<?php echo $number; ?>"
>>value="30-40">30-40
>> <input type="radio name"Age[]<?php echo $number; ?>"
>>value="40-50">40-50
>><?php
>> }
>>?>
>>>
>>Now them radiogroups have names like Age0[] and Age1[]
>>>
>>And in the receiving script:
>>$numberOfAg es = $_POST["numberOfAg es"];
>>for ($count=0;$coun t<$numberOfAges ;$count++){
>> $name = "Age".$coun t;
>> $theSelectedVal ue = $_POST[$name];
>> // Do whatever you want with $theSelectedVal ue
>>>
>>}
>>>
>>Not tested, but I hope you get my drift. :-)
>>>
>>Regards,
>>Erwin Moller

>Thanks, that did the trick. I was just putting my variable before []
>instead of after. Odd thing is that when I read it into the database,
>I just use $Age[$i], where I thought I would have to use $Age[$i]
>$Number. Not sure what is going on under the hood to make $Age[]
>$Number into just $Age.

>
Hi Jerim,
>
It is just the PHP way of passing arrays around from a form to a receiving
script.
If PHP receives for example the following 3 name/value pairs (via POST or
GET), they are automagically turned into an array:
>
1) name: Age[] value: 10
2) name: Age[] value: 20
3) name: Age[] value: 30
>
If you extract the Age from the posting, like this:
$passedAge = $_POST["Age"];
PHP 'sees' that Age[] is posted and extracts all the passed values into an
array ($passedAge in this case).
So if a name ends with the [] PHP knows you mean an array.
>
It is just the PHP way. :-)
>
Consider this wrong example:
1) name: Age value: 10
2) name: Age value: 20
3) name: Age value: 30
>
If you try to extract it now like this:
$passedAge = $_POST["Age"];
>
You'll end up with only the last value (30) and not an array.
>
So what went wrong in your first try was simply that you didn't end with the
[].
>
Hope that clearifies it a bit.
>
Good luck & happy coding!
>
Regards,
Erwin Moller

Just for clarification:
ending a passed variable with a [] tells PHP it is an array.
This is NOT a html construct, html doesn't care.
Right ?

bill

**Erwin Moller** · Apr 7 '07, 11:25 AM

Re: Dynamic Radio Buttons

bill wrote:

Erwin Moller wrote:

>Jerim79 wrote:
>>

>>On Apr 6, 9:08 am, Erwin Moller
>><since_humans _read_this_I_am _spammed_too_m. ..@spamyourself .comwrote:
>>>Jerim79 wrote:
>>>>My situation is that I have a form that asks the user for a number.
>>>>Next, I execute a while loop that displays a group of questions the
>>>>amount of times the customer entered. For instance, the loop looks
>>>>this:
>>>>while ($Number!=0){
>>>> <input type="radio" name="Age[]" value="20-30">20-30
>>>> <input type="radio name="Age[]" value="30-40">30-40
>>>> <input type="radio name"Age[]" value="40-50">40-50
>>>> $Number--;
>>>> }
>>>>Let's say someone entered 3 for $Number. When the loop executes it
>>>>will produce:
>>>> echo" <input type=\"radio\" name=\"Age[]\" value=\"20-30\">20-30
>>>> <input type=\"radio\" name=\"Age[]\" value=\"30-40\">30-40
>>>> <input type=\"radio\" name=\"Age[]\" value=\"40-50\">40-50";
>>>> echo" <input type=\"radio\" name=\"Age[]\" value=\"20-30\">20-30
>>>> <input type=\"radio\" name=\"Age[]\" value=\"30-40\">30-40
>>>> <input type=\"radio\" name=\"Age[]\" value=\"40-50\">40-50";
>>>> echo" <input type=\"radio\" name=\"Age[]\" value=\"20-30\">20-30
>>>> <input type=\"radio\" name=\"Age[]\" value=\"30-40\">30-40
>>>> <input type=\"radio\" name=\"Age[]\" value=\"40-50\">40-50";
>>>>The problem is that with radio buttons, you can only choose one
>>>>option. With this code, it only allows the user to choose one option
>>>>from among the 9 listed, instead of one from each set. I am trying to
>>>>find a way to dynamically name each set. If I use checkboxes, then it
>>>>records the information correctly and correctly writes it to the
>>>>database. However, checkboxes don't look good for this application in
>>>>my opinion, and there is no way for me to keep someone from checking
>>>>more than one box, that I know of. Here is the PHP code I am using to
>>>>catch the user's input and write it to a database:
>>>>$Age = $_POST['Age'];
>>>>for ($i=0; $i < $Number; $i++) {
>>>> $query="INSERT INTO table VALUES('$Age[$i])";
>>>>$result = mysql_query($qu ery) or die('Query failed: ' .
>>>>mysql_error ());
>>>>}
>>>>Like I say, that works fine if I use checkboxes, without changing the
>>>>HTML name="Age[]". I am looking for a way to define "sets" of radio
>>>>buttons with the same name, so that only one from within a set can be
>>>>chosen at a time. Is there something such as:
>>>>echo "<group name="1">
>>>> <input type=\"radio\" name=\"Age[]\" value=\"20-30\">20-30
>>>> <input type=\"radio\" name=\"Age[]\" value=\"30-40\">30-40
>>>> <input type=\"radio\" name=\"Age[]\" value=\"40-50\">40-50
>>>></group>";
>>>>echo "<group name=\"2\">
>>>> <input type=\"radio\" name=\"Age[]\" value=\"20-30\">20-30
>>>> <input type=\"radio\" name=\"Age[]\" value=\"30-40\">30-40
>>>> <input type=\"radio\" name=\"Age[]\" value=\"40-50\">40-50
>>>></group>";
>>>>echo "<group name=\"3\">
>>>> <input type=\"radio\" name=\"Age[]\" value=\"20-30\">20-30
>>>> <input type=\"radio\" name=\"Age[]\" value=\"30-40\">30-40
>>>> <input type=\"radio\" name=\"Age[]\" value=\"40-50\">40-50
>>>></group>";
>>>>This may be more of a HTML question, but I am open to any solution
>>>>that would help. Any way to use PHP to accomplish my goal? Even if
>>>>there is a way to dynamically name each set such as:
>>>>echo "while ($Number!=0){
>>>> <input type=\"radio\" name=\"Age$Numb er[]\" value=\"20-30"\>20-30
>>>> <input type=\"radio\" name=\"Age$Numb er[]\" value=\"30-40\">30-40
>>>> <input type=\"radio\" name=\"Age$Numb er[]\" value=\"40-50\">40-50
>>>> $Number--
>>>> } ";
>>>>I would just have to create a loop to run through each array when
>>>>writing to the database, but that shouldn't be a problem.
>>>Hi,
>>>>
>>>You cannot make a group of the radiobuttons since you named them all
>>>Age[] and that IS the group as far as HTML is concerned.
>>>So just code it in such a way they have different names, like this:
>>>>
>>><?php
>>>// receive number
>>>$number = (int)$_POST["number"];
>>>?>
>>><input type="hidden" name="numberOfA ges" value="<?php echo $number;
>>>?>"<?php
>>>for ($count=0;$coun t<$number;$coun t++){
>>>?>
>>> <input type="radio" name="Age<?php echo $number; ?>[]"
>>>value="20-30">20-30
>>> <input type="radio name="Age[]<?php echo $number; ?>"
>>>value="30-40">30-40
>>> <input type="radio name"Age[]<?php echo $number; ?>"
>>>value="40-50">40-50
>>><?php
>>> }
>>>?>
>>>>
>>>Now them radiogroups have names like Age0[] and Age1[]
>>>>
>>>And in the receiving script:
>>>$numberOfAge s = $_POST["numberOfAg es"];
>>>for ($count=0;$coun t<$numberOfAges ;$count++){
>>> $name = "Age".$coun t;
>>> $theSelectedVal ue = $_POST[$name];
>>> // Do whatever you want with $theSelectedVal ue
>>>>
>>>}
>>>>
>>>Not tested, but I hope you get my drift. :-)
>>>>
>>>Regards,
>>>Erwin Moller
>>Thanks, that did the trick. I was just putting my variable before []
>>instead of after. Odd thing is that when I read it into the database,
>>I just use $Age[$i], where I thought I would have to use $Age[$i]
>>$Number. Not sure what is going on under the hood to make $Age[]
>>$Number into just $Age.

>>
>Hi Jerim,
>>
>It is just the PHP way of passing arrays around from a form to a
>receiving script.
>If PHP receives for example the following 3 name/value pairs (via POST or
>GET), they are automagically turned into an array:
>>
>1) name: Age[] value: 10
>2) name: Age[] value: 20
>3) name: Age[] value: 30
>>
>If you extract the Age from the posting, like this:
>$passedAge = $_POST["Age"];
>PHP 'sees' that Age[] is posted and extracts all the passed values into
>an array ($passedAge in this case).
>So if a name ends with the [] PHP knows you mean an array.
>>
>It is just the PHP way. :-)
>>
>Consider this wrong example:
>1) name: Age value: 10
>2) name: Age value: 20
>3) name: Age value: 30
>>
>If you try to extract it now like this:
>$passedAge = $_POST["Age"];
>>
>You'll end up with only the last value (30) and not an array.
>>
>So what went wrong in your first try was simply that you didn't end with
>the
>[].
>>
>Hope that clearifies it a bit.
>>
>Good luck & happy coding!
>>
>Regards,
>Erwin Moller

>
Just for clarification:
ending a passed variable with a [] tells PHP it is an array.
This is NOT a html construct, html doesn't care.
Right ?

Right.
HTML just sends all the form's name/value pairs to whatever is defined as
'action' in the form.

Regards,
Erwin Moller

>
bill

**bill** · Apr 8 '07, 02:45 PM

Re: Dynamic Radio Buttons

Erwin Moller wrote:

bill wrote:
>

>Erwin Moller wrote:

>>Jerim79 wrote:
>>>
>>>On Apr 6, 9:08 am, Erwin Moller
>>><since_human s_read_this_I_a m_spammed_too_m ...@spamyoursel f.comwrote:
>>>>Jerim79 wrote:
>>>>>My situation is that I have a form that asks the user for a number.
>>>>>Next, I execute a while loop that displays a group of questions the
>>>>>amount of times the customer entered. For instance, the loop looks
>>>>>this:
>>>>>while ($Number!=0){
>>>>> <input type="radio" name="Age[]" value="20-30">20-30
>>>>> <input type="radio name="Age[]" value="30-40">30-40
>>>>> <input type="radio name"Age[]" value="40-50">40-50
>>>>> $Number--;
>>>>> }
>>>>>Let's say someone entered 3 for $Number. When the loop executes it
>>>>>will produce:
>>>>> echo" <input type=\"radio\" name=\"Age[]\" value=\"20-30\">20-30
>>>>> <input type=\"radio\" name=\"Age[]\" value=\"30-40\">30-40
>>>>> <input type=\"radio\" name=\"Age[]\" value=\"40-50\">40-50";
>>>>> echo" <input type=\"radio\" name=\"Age[]\" value=\"20-30\">20-30
>>>>> <input type=\"radio\" name=\"Age[]\" value=\"30-40\">30-40
>>>>> <input type=\"radio\" name=\"Age[]\" value=\"40-50\">40-50";
>>>>> echo" <input type=\"radio\" name=\"Age[]\" value=\"20-30\">20-30
>>>>> <input type=\"radio\" name=\"Age[]\" value=\"30-40\">30-40
>>>>> <input type=\"radio\" name=\"Age[]\" value=\"40-50\">40-50";
>>>>>The problem is that with radio buttons, you can only choose one
>>>>>option. With this code, it only allows the user to choose one option
>>>>>from among the 9 listed, instead of one from each set. I am trying to
>>>>>find a way to dynamically name each set. If I use checkboxes, then it
>>>>>records the information correctly and correctly writes it to the
>>>>>database . However, checkboxes don't look good for this application in
>>>>>my opinion, and there is no way for me to keep someone from checking
>>>>>more than one box, that I know of. Here is the PHP code I am using to
>>>>>catch the user's input and write it to a database:
>>>>>$Age = $_POST['Age'];
>>>>>for ($i=0; $i < $Number; $i++) {
>>>>> $query="INSERT INTO table VALUES('$Age[$i])";
>>>>>$result = mysql_query($qu ery) or die('Query failed: ' .
>>>>>mysql_erro r());
>>>>>}
>>>>>Like I say, that works fine if I use checkboxes, without changing the
>>>>>HTML name="Age[]". I am looking for a way to define "sets" of radio
>>>>>buttons with the same name, so that only one from within a set can be
>>>>>chosen at a time. Is there something such as:
>>>>>echo "<group name="1">
>>>>> <input type=\"radio\" name=\"Age[]\" value=\"20-30\">20-30
>>>>> <input type=\"radio\" name=\"Age[]\" value=\"30-40\">30-40
>>>>> <input type=\"radio\" name=\"Age[]\" value=\"40-50\">40-50
>>>>></group>";
>>>>>echo "<group name=\"2\">
>>>>> <input type=\"radio\" name=\"Age[]\" value=\"20-30\">20-30
>>>>> <input type=\"radio\" name=\"Age[]\" value=\"30-40\">30-40
>>>>> <input type=\"radio\" name=\"Age[]\" value=\"40-50\">40-50
>>>>></group>";
>>>>>echo "<group name=\"3\">
>>>>> <input type=\"radio\" name=\"Age[]\" value=\"20-30\">20-30
>>>>> <input type=\"radio\" name=\"Age[]\" value=\"30-40\">30-40
>>>>> <input type=\"radio\" name=\"Age[]\" value=\"40-50\">40-50
>>>>></group>";
>>>>>This may be more of a HTML question, but I am open to any solution
>>>>>that would help. Any way to use PHP to accomplish my goal? Even if
>>>>>there is a way to dynamically name each set such as:
>>>>>echo "while ($Number!=0){
>>>>> <input type=\"radio\" name=\"Age$Numb er[]\" value=\"20-30"\>20-30
>>>>> <input type=\"radio\" name=\"Age$Numb er[]\" value=\"30-40\">30-40
>>>>> <input type=\"radio\" name=\"Age$Numb er[]\" value=\"40-50\">40-50
>>>>> $Number--
>>>>> } ";
>>>>>I would just have to create a loop to run through each array when
>>>>>writing to the database, but that shouldn't be a problem.
>>>>Hi,
>>>>>
>>>>You cannot make a group of the radiobuttons since you named them all
>>>>Age[] and that IS the group as far as HTML is concerned.
>>>>So just code it in such a way they have different names, like this:
>>>>>
>>>><?php
>>>>// receive number
>>>>$number = (int)$_POST["number"];
>>>>?>
>>>><input type="hidden" name="numberOfA ges" value="<?php echo $number;
>>>>?>"<?php
>>>>for ($count=0;$coun t<$number;$coun t++){
>>>>?>
>>>> <input type="radio" name="Age<?php echo $number; ?>[]"
>>>>value="20-30">20-30
>>>> <input type="radio name="Age[]<?php echo $number; ?>"
>>>>value="30-40">30-40
>>>> <input type="radio name"Age[]<?php echo $number; ?>"
>>>>value="40-50">40-50
>>>><?php
>>>> }
>>>>?>
>>>>>
>>>>Now them radiogroups have names like Age0[] and Age1[]
>>>>>
>>>>And in the receiving script:
>>>>$numberOfAg es = $_POST["numberOfAg es"];
>>>>for ($count=0;$coun t<$numberOfAges ;$count++){
>>>> $name = "Age".$coun t;
>>>> $theSelectedVal ue = $_POST[$name];
>>>> // Do whatever you want with $theSelectedVal ue
>>>>>
>>>>}
>>>>>
>>>>Not tested, but I hope you get my drift. :-)
>>>>>
>>>>Regards,
>>>>Erwin Moller
>>>Thanks, that did the trick. I was just putting my variable before []
>>>instead of after. Odd thing is that when I read it into the database,
>>>I just use $Age[$i], where I thought I would have to use $Age[$i]
>>>$Number. Not sure what is going on under the hood to make $Age[]
>>>$Number into just $Age.
>>Hi Jerim,
>>>
>>It is just the PHP way of passing arrays around from a form to a
>>receiving script.
>>If PHP receives for example the following 3 name/value pairs (via POST or
>>GET), they are automagically turned into an array:
>>>
>>1) name: Age[] value: 10
>>2) name: Age[] value: 20
>>3) name: Age[] value: 30
>>>
>>If you extract the Age from the posting, like this:
>>$passedAge = $_POST["Age"];
>>PHP 'sees' that Age[] is posted and extracts all the passed values into
>>an array ($passedAge in this case).
>>So if a name ends with the [] PHP knows you mean an array.
>>>
>>It is just the PHP way. :-)
>>>
>>Consider this wrong example:
>>1) name: Age value: 10
>>2) name: Age value: 20
>>3) name: Age value: 30
>>>
>>If you try to extract it now like this:
>>$passedAge = $_POST["Age"];
>>>
>>You'll end up with only the last value (30) and not an array.
>>>
>>So what went wrong in your first try was simply that you didn't end with
>>the
>>[].
>>>
>>Hope that clearifies it a bit.
>>>
>>Good luck & happy coding!
>>>
>>Regards,
>>Erwin Moller

>Just for clarification:
>ending a passed variable with a [] tells PHP it is an array.
>This is NOT a html construct, html doesn't care.
>Right ?

>
Right.
HTML just sends all the form's name/value pairs to whatever is defined as
'action' in the form.
>
Regards,
Erwin Moller
>
>

>bill

>

Thanks, good to know.

bill

Dynamic Radio Buttons

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